IEC 60770-1:2010

Transmitters for use in industrial-process control systems - Part 1: Methods for performance evaluation

IEC 60770-1:2010 is intended to specify uniform methods of test for the evaluation of the performance of transmitters with pneumatic or electric output signals. It is applicable to transmitters which have either a standard analogue electric current output signal or a standard pneumatic output analogue signal in accordance with IEC 60381-1 or IEC 60382. The tests detailed herein may be applied to transmitters which have other output signals, provided that due allowance is made for such differences. This second edition cancels and replaces the first edition published in 1999 and constitutes a technical revision. The significant technical change with respect to the previous edition is as follows: 4.3 Load conditions,for pneumatic transmitters, load details have been added.
This publication is to be read in conjunction with IEC 61298-1:2008, IEC 61298-2:2008, IEC 61298-3:2008 and IEC 61298-4:2008.

Transmetteurs utilisés dans les systèmes de conduite des processus industriels - Partie 1: Méthodes d'évaluation des performances

La CEI 60770-1:2010 spécifie des méthodes uniformes d'essai pour l'évaluation des performances des transmetteurs à signaux de sortie électriques ou pneumatiques. Elle s'applique aux transmetteurs ayant pour signal de sortie normalisé soit un courant électrique analogique, soit un signal pneumatique analogique, conformément à la CEI 60381-1 ou à la CEI 60382. Les essais détaillés dans cette norme peuvent être applicables à des transmetteurs dotés d'autres signaux de sortie, à condition de tenir compte, de façon appropriée, de ces différences. Cette deuxième édition annule et remplace la première édition, parue en 1999, dont elle constitue une révision technique. La modification technique principale par rapport à l'édition précédente est la suivante: 4.3 Conditions de charge, pour les transmetteurs pneumatiques, des détails de charge ont été ajoutés.
Cette publication doit être lue conjointement avec la CEI 61298-1:2008, la CEI 61298-2:2008, la CEI 61298-3:2008 et la CEI 61298-4:2008.

General Information

• Status: Replaced
• Publication Date: 27-Jul-2010
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: SC 65B - Measurement and control devices
• Drafting Committee: WG 6 - TC 65/SC 65B/WG 6
• Current Stage: DELPUB - Deleted Publication
• Start Date: 18-Aug-2020
• Completion Date: 26-Oct-2025

Relations

• Replaced By: IEC 62828-2:2017 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 2: Specific procedures for pressure transmitters
• Effective Date: 05-Sep-2023
• Replaced By: IEC 62828-3:2018 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 3: Specific procedures for temperature transmitters
• Effective Date: 05-Sep-2023
• Replaced By: IEC 62828-1:2017 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 1: General procedures for all types of transmitters
• Effective Date: 05-Sep-2023
• Replaced By: IEC 62828-4:2020 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 4: Specific procedures for level transmitters
• Effective Date: 05-Sep-2023
• Replaced By: IEC 62828-5:2020 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 5: Specific procedures for flow transmitters
• Effective Date: 05-Sep-2023
• Revises: IEC 60770-1:1999 - Transmitters for use in industrial-process control systems - Part 1: Methods for performance evaluation
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60770-1 ®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Transmitters for use in industrial-process control systems –
Part 1: Methods for performance evaluation

Transmetteurs utilisés dans les systèmes de conduite des processus
industriels –
Partie 1: Méthodes d’évaluation des performances

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IEC 60770-1 ®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Transmitters for use in industrial-process control systems –
Part 1: Methods for performance evaluation

Transmetteurs utilisés dans les systèmes de conduite des processus
industriels –
Partie 1: Méthodes d’évaluation des performances

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 25.040.40 ISBN 978-2-88912-082-6
– 2 – 60770-1 © IEC:2010
CONTENTS
FOREWORD.3
1 Scope and object .5
2 Normative references.5
3 Terms and definitions .7
4 General conditions for tests .7
4.1 Overview .7
4.2 Supply conditions.7
4.3 Load conditions .7
4.4 Input variable quality.7
5 Analysis and classification of transmitter performance.7
6 General testing procedures and precautions.8
7 Test procedures and reporting .8
8 Other considerations.13
8.1 General .13
8.2 Safety.13
8.3 Degree of protection provided by enclosure.13
8.4 Documentary information (see IEC 61187) .13
8.5 Installation.14
8.6 Routine maintenance and adjustment .14
8.7 Repair .14
8.8 Protective finishes .14
8.9 Design features .14
8.10 Variants.14
8.11 Tools and equipment .14
9 Test report and documentation.14
Annex A (informative) Analysis and classification of the instrument performance .15
Bibliography .19

Figure A.1 – Instrument model .15

Table 1 – Tests for all transmitters .8
Table 2 – Additional tests for electrically powered transmitters.10
Table 3 – Additional tests for pneumatic transmitters .13

60770-1 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TRANSMITTERS FOR USE IN INDUSTRIAL-PROCESS
CONTROL SYSTEMS –
Part 1: Methods for performance evaluation

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60770-1 has been prepared by subcommittee 65B: Devices &
process analysis, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 1999. This edition
constitutes a technical revision.
The significant technical change with respect to the previous edition is as follows:
• 4.3 Load conditions: For pneumatic transmitters, load details have been added.
This standard should be read in conjunction with IEC 61298-1, IEC 61298-2, IEC 61298-3 and
IEC 61298-4.
– 4 – 60770-1 © IEC:2010
The text of this standard is based on the following documents:
CDV Report on voting
65B/656/CDV 65B/720/CDV
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60770 series, published under the general title Transmitters for use in
industrial-process control systems, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60770-1 © IEC:2010 – 5 –
TRANSMITTERS FOR USE IN INDUSTRIAL-PROCESS
CONTROL SYSTEMS –
Part 1: Methods for performance evaluation

1 Scope and object
This part of IEC 60770 is applicable to transmitters which have either a standard analogue
electric current output signal or a standard pneumatic output analogue signal in accordance
with IEC 60381-1 or IEC 60382. The tests detailed herein may be applied to transmitters which
have other output signals, provided that due allowance is made for such differences.
For the evaluation of the intelligent transmitters see IEC 60770-3.
For certain types of transmitters where the sensor is an integral part, other specific IEC or ISO
standards may need to be consulted (e.g. for chemical analysers, flowmeters, etc.)
This standard is intended to specify uniform methods of test for the evaluation of the
performance of transmitters with pneumatic or electric output signals.
The methods of evaluation specified in this standard are intended for use by manufacturers to
determine the performance of their products and by users or independent testing establish-
ments to verify manufacturers' performance specifications.
The test conditions defined in this standard, for example the range of ambient temperatures
and power supply, represent those which commonly arise in use. Consequently, the values
specified herein should be used where no other values are specified by the manufacturer.
The tests specified in this standard are not necessarily sufficient for instruments specifically
designed for unusually arduous or safety related duties. Conversely, a restricted series of test
may be suitable for instruments designed to perform within a more limited range of conditions.
When a full evaluation in accordance with this standard is not required, those tests which are
required shall be performed and the results reported in accordance with those parts of the
standard which are relevant.
2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 60050-300:2001, International Electrotechnical Vocabulary – Electrical and electronic
measurements and measuring instruments – Part 311: General terms relating to measurements
– Part 312: General terms relating to electrical measurements – Part 313: Types of electrical
measuring instruments – Part 314: Specific terms according to the type of instrument
IEC 60068-2-1:2007, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2:1974, Environmental testing – Part 2-2: Tests – Test B: Dry heat

– 6 – 60770-1 © IEC:2010
IEC 60068-2-31:2008, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling
shocks, primarily for equipment-type specimens
IEC 60381-1:1982, Analogue signals for process control systems – Part 1: Direct current
signals
IEC 60382:1991, Analogue pneumatic signal for process control systems
IEC 60529:2001, Degrees of protection provided by enclosures (IP Code)
IEC 60770-3:2006, Transmitters for use in industrial-process control systems – Part 3: Methods
for performance evaluation of intelligent transmitters
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2008, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4:2004, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6:2008, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and
measurement techniques – Power frequency magnetic field immunity test
IEC 61000-4-10:2001, Electromagnetic compatibility (EMC) – Part 4-10: Testing and
measurement techniques – Damped oscillatory magnetic field immunity test
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests
IEC 61000-4-12:2006, Electromagnetic compatibility (EMC) – Part 4-12: Testing and
measurement techniques – Ring wave immunity test
IEC 61000-4-16:2002, Electromagnetic compatibility (EMC) – Part 4-16: Testing and
measurement techniques – Test for immunity to conducted, common mode disturbances in the
frequency range 0 Hz to 150 kHz
IEC 61010-1:2001, Safety requirements for electrical equipment for measurement, control, and
laboratory use – Part 1: General requirements
IEC 61032:1997, Protection of persons and equipment by enclosures – Probes for verification
IEC 61298-1:2008, Process measurement and control devices – General methods and
procedures for evaluating performance – Part 1: General considerations
IEC 61298-2:2008, Process measurement and control devices – General methods and
procedures for evaluating performance – Part 2: Tests under reference conditions

60770-1 © IEC:2010 – 7 –
IEC 61298-3:2008, Process measurement and control devices – General methods and
procedures for evaluating performance – Part 3: Tests for the effects of influence quantities
IEC 61298-4:2008, Process measurement and control devices – General methods and
procedures for evaluating performance – Part 4: Evaluation report content
3 Terms and definitions
For the purposes of this part of IEC 60770, definitions given in IEC 60050-300 and in
IEC 61298-1 are applicable.
4 General conditions for tests
4.1 Overview
For the purpose of this standard, the general test conditions (e.g. environmental test
conditions, supply conditions, load conditions, mounting position, externally induced vibrations,
external mechanical constraints, constancy of the operating conditions and settings, input
variable quality, delivery of the transmitter, etc.) specified in IEC 61298-1 apply, together with
the additional information below.
NOTE It is desirable that the closest communication should be maintained between the manufacturer and the
evaluating body. The manufacturer's specifications for the instrument should be taken into account when the test
programme is being decided, and the manufacturer should be invited to comment on both the test programmes and
the results.
4.2 Supply conditions
For the two-wire transmitters, the normal supply voltage might be 24 V d.c. For pneumatic
transmitters, the normal pressure supply might be 140 kPa (1,4 bar).
Tolerances on supply conditions, as given in IEC 61298-1, are not applicable to transmitters
with self-contained power supplies (e.g. battery-powered). The tolerance for battery-powered
equipment shall be agreed.
4.3 Load conditions
The value of the load to be used shall be agreed. A load of 250 Ω is a commonly used value
for electrical transmitters. For pneumatic transmitters, unless otherwise specified, a test load
consisting of an 8 m long rigid pipe with a 4 mm internal diameter, followed by a 20 cm
capacity (or more), shall be used. Care should be taken to ensure that pneumatic connections
are leak-tight.
4.4 Input variable quality
For transmitters that are to be evaluated with an integral sensor, the conditions and
requirements for maintaining the quantities to be measured (physical/chemical) shall be
properly stated (e.g. for flow transmitters, the fluid through the measuring device shall be that
specified by the manufacturer; the temperature of the fluid shall be maintained within ±2 °C of
the value specified in order to ensure the correct values of density and viscosity).
5 Analysis and classification of transmitter performance
In determining the test programme and test values to be used in the evaluation, the physical
and functional design of transmitter should be taken into account.
Guidance on this process can be found in Annex A.

– 8 – 60770-1 © IEC:2010
6 General testing procedures and precautions
For the purpose of this standard, the general testing procedures and precautions (e.g.
identification and inspection, preparation for the tests, uncertainty of the measuring system,
traceability, tapping, setting of adjustments, preconditioning, sequence of tests, interruption
and duration of each series of measurements, anomalies and failures during tests, re-start of a
test, input/output variable relationships, error assessment, symbols and units of measurement,
etc.) specified in IEC 61298-1 shall be applied. The instrument shall be calibrated by the
manufacturer and tested without recalibration. Then additional measurements should be made
at the lowest and highest possible span and the remainder of the tests should be carried out at
the mean value.
7 Test procedures and reporting
The tests given in Tables 1, 2 and 3 are suitable for industrial process transmitters. If a full
evaluation is planned, each applicable test should be conducted. The results should be
reported as a percentage of the output span. Unexpected events, including faults and
malfunctions, shall be reported.
The test procedures and precautions are described in detail in IEC 61298-2 and IEC 61298-3.
Table 1 – Tests for all transmitters
Designation Notes on test methods and on Reference Additional information
information to be reported
Accuracy-related factors
IEC 61298-2
• Checking of calibration
made prior to delivery
1 2
Three to five upscale and downscale IEC 61298-2
• Inaccuracy and
full-range traverses, measuring at least
measured error
six points along the scale every nearly
20 %. Compute errors and plot error
curves
IEC 61298-2
• Non-linearity
IEC 61298-2
• Non-conformity
IEC 61298-2
• Hysteresis
• Non-repeatability  IEC 61298-2
• Dead band Vary input to obtain detectable output IEC 61298-2
change at 10 %, 50 %, 90 % output.
Report the maximum variation of input
in % of input span
Apply peak-to-peak amplitude of 20 % IEC 61298-2
• Frequency response
of the input span at frequencies
required in order to vary dynamic gain
from 1 to 0,1
Plot against frequency
– the gain relative to zero frequency
gain;
– the phase lag between the output
and input
Input steps corresponding to 80 % and IEC 61298-2
• Step response
10 % of output span.
Record the step response time and also
the time for the output to reach and
remain within 1 % of output span of its
steady value (settling time)
• Start-up drift Output monitored for 4 h after power is IEC 61298-2
switched on
60770-1 © IEC:2010 – 9 –
Designation Notes on test methods and on Reference Additional information
information to be reported
• Long-term drift Output monitored for 30 days with an IEC 61298-2
input of 90 % of the span
Effects of influence
quantities
• Ambient temperature Two or three cycles of the temperature IEC 61298-3
range specified
One cycle at 40 °C; 93 % HR IEC 61298-3
• Humidity
Initial resonance search, endurance IEC 61298-3
• Vibration (sinusoidal)
conditioning over 60 sweep cycles, and
final resonance search
• Shock "Drop and topple" procedure in IEC 61298-3
accordance with IEC 60068-2-31
±10° inclination in two ortogonal planes IEC 61298-3
• Mounting position
Overrange of 50% of the sensor upper IEC 61298-3
• Overrange
range limit for 1 min. Measure 5 min
after return to a value within the normal
range
For differential pressure transmitters,
carry out with the line pressure on both
of the inputs in turn
• Temperature of process Steady-state changes at 10 % and IEC 61298-3 Only when effect is
90 % of the input span significant
fluid
Change of output at 10 % and 90 % of IEC 61298-3 Only if applicable, e.g.
• Flow of process fluid
the input span when for normal operation
through the transmitter
process fluid flows through
(other than flow
transmitter) part of the transmitter
Change of output at 10 % and 90 % of IEC 61298-3 Only for differential
• Static line pressure
effect the input span at each 25 % increment pressure transmitters
of the static pressure, if applicable.
Where not applicable the test shall be
performed at least measuring the
change of output 0 for 0 differential
pressure input
Change at 10 % and 90 % of the output IEC 61298-3
• Flow of purge gas
with purge flow to 0 %, 50 % and 100 %
through the transmitter
of the maximum specified (if
applicable)
100 000 cycles of amplitude equal to IEC 61298-3
• Accelerated life
half the span. Measure lower range
value, span and hysteresis at start and
finish of test. Additional measurements
during the test may be required if wear
or ageing is anticipated
For transmitters with analogue output, which include smart options, the adjustment of zero and span can be
obtained either locally or by remote device (e.g. computer, hand terminal). These instruments may be equipped with
facilities for “blind calibration”. In this case no accurate test device is needed for the adjustment of zero and span.
For this type of transmitter, some manufacturers specify also the inaccuracy of the transmitter after the blind
calibration. This type of inaccuracy may differ from the inaccuracy of an instrument calibrated against a standard
test device. It can be considered as a new function to be evaluated.
For the purpose of this test and unless otherwise specified for a particular type of transmitter, the measurement
cycles shall be at least three but preferably five and the test points six (0 %, 20 %, 40 %, 60 %, 80 %, 100 % input
span) or eleven (0 %, 10 %, 20 %, 30 %, 40 %, 50 %, 60 %, 70 %, 80 %, 90 %, 100 % input span). For instruments
with a non-linear input-output relationship (e.g. square law), the test points should be chosen so as to obtain output
values equally distributed over the output span.
Unless the dead band is known to be insignificant, it shall be measured at 10 %, 50 % and 90 % of the span,
proceeding as follows:
a) set the input at the first test point (e.g. 10 %);
b) note the input value;
c) slowly increase the input variable to the transmitter until a detectable output change is observed;

– 10 – 60770-1 © IEC:2010
Designation Notes on test methods and on Reference Additional information
information to be reported
d) note the input value and repeat the operation in the opposite direction as specified in IEC 61298-2.
The increment through which the input signal is varied (difference between d) and b) above), is the dead band at
this point.
Repeat steps c) and d), slowly increasing the input again until a detectable output change is observed and noting
the input value: the increments shall be observed and recorded at least three times, and preferably five times, at
each of three test points close to 10 %, 50 % and 90 % of the span, over a full-range traverse.
This procedure shall be repeated, at each of the three test points (close to 90 %, 50 % and 10 % of span),
decreasing the input variable starting from 90 % of the span.
If it is not practicable to generate a sinusoidal signal to be applied to the input of certain transmitters, (flow,
integrally mounted sensor transmitters, etc.) this test should not be performed.
For pneumatic transmitters, unless otherwise specified, a test load consisting of an 8 m long rigid pipe with a 4 mm
internal diameter, followed by a 20 cm capacity, shall be used. Lower amplitudes may be necessary to investigate
the full bandwidth capability.
Where practicable, the data should be measured each day and processed to determine a best fit straight line
and verify if there is a drift in one direction or a random drift.
For further information on test temperature procedures, see IEC 60068-2-1 and IEC 60068-2-2.
For pressure transmitters the test shall be executed on the two ortogonal planes of the primary pressure element
with ±180° respect nominal mounting position or within the limits specified by the manufacturer.

Table 2 – Additional tests for electrically powered transmitters
Designation Notes on test methods and on Reference Additional information
information to be reported
Input resistance of a Resistance presented to d.c. input IEC 61298-2
transmitter with electrical signals at the input terminals,
inputs
expressed in Ω
Insulation resistance Insulation resistance to earth or to the IEC 61298-2
case of each circuit at 500 V d.c. for
30 s, expressed in Ω
Dielectric strength The r.m.s. test voltage (mains IEC 61298-2
frequency) specified shall not result in
breakdown or flashover
Power consumption Load at maximum supply voltage and IEC 61298-2
minimum frequency specified by
manufacturer (in W and VA)
Output ripple Peak-to-peak values and principle IEC 61298-2
frequency components
Output load Vary load resistance from minimum to IEC 61298-3
maximum as specified by manufacturer
Source impedance Vary input circuit resistance from
minimum to maximum values specified
by manufacturer
Supply voltage and Nine sets of measurements for IEC 61298-3
frequency variations variations in a.c. voltage and frequency
For transmitters using a d.c. mains
supply, three sets are required
For two-wire transmitters (loop
powered) measure the minimum
voltage that is required to sustain the
20 mA output current
Supply voltage depressions At 75 % of nominal supply voltage for IEC 61298-3
5 s. Report the effect on the output
signal and its duration. Voltage dips for
up to 100 ms may also need to be
investigated
60770-1 © IEC:2010 – 11 –
Designation Notes on test methods and on Reference Additional information
information to be reported
4 5
Short-term supply voltage Repeated interruptions at crossover IEC 61298-3
interruptions point of 1, 5, 10, 25 cycles for a.c.
supply; 5, 20, 100, 200 and 500 ms for
d.c. supply. Report the peak positive
and negative and the time required to
stabilise
Reverse supply voltage IEC 61298-3
protection
Common mode interference For transmitters with terminals isolated IEC 61298-3
from earth 250 V r.m.s., a.c. at mains
frequency superimposed on isolated
terminals
Then positive and negative 50 V d.c.
superimposed on isolated terminals

Normal mode interference 1 V or less, at mains frequency and IEC 61298-3
(series mode) 10 % and 90 % of the output span

Earthing Only for transmitters with isolated IEC 61298-3
terminals. Record transients and
changes of output
Electrical fast transients Test voltage specified or 2 kV peak IEC 61298-3
(bursts)
Surge voltage immunity Test voltage specified in the product IEC 61298-3
standard or by user. Commonly used
maximum values are 2 kV peak
(asymmetric) and 1 kV peak
(symmetric)
Damped oscillatory waves Test voltage specified or 0,5 kV peak
at 1 MHz
Conducted sine-wave RF- Test voltage specified or 10 V r.m.s.
disturbances from 0,15 MHz to 80 MHz
Electrostatic discharge Test voltage specified or 6 kV IEC 61298-3
(contact), 8 kV (air)
Power frequency magnetic Continuous: 100 A/m (unless higher IEC 61298-3
field values are agreed) at 10 % and 90 % of
the output span
Short duration: 400 A/m for 1 s at 50 %
output span
Damped oscillatory Value of field specified or 30 A/m at
magnetic field 0,1 MHz and 1,0 MHz
Radiated, radio-frequency Value of field specified or 10 V/m from IEC 61298-3
electromagnetic field 80 MHz to 1 GHz

Open and short-circuit Interrupt each input connection and IEC 61298-3
of input then short together. Report times for
the output to recover after removal of

open circuit and short-circuit
Open and short-circuit Interrupt each output connection and IEC 61298-3
of output then short together. Report times for
the output to recover after removal of
open circuit and short-circuit

– 12 – 60770-1 © IEC:2010
Designation Notes on test methods and on Reference Additional information
information to be reported
The test shall be carried out on the powered transmitter.
If no values are specified, the output load for milliampere outputs shall be varied gradually from short circuit to
open circuit and for volt outputs shall be varied from open circuit to short circuit.
On transmitters, the input to which is an electrical voltage, the change in output caused by varying the resistance
in the test input circuit from the minimum value specified by the manufacturer to the maximum value shall be
measured. The resistance shall be distributed equally in each line (input terminal).
Refer also to IEC 61000-4-11.
For smart transmitters with analogue output, the effect of the supply voltage interruptions on the output may
depend on the point in the cycle of the transmitter at which the interruption occurs.
Refer also to IEC 61000-4-16.
Refer also to IEC 61000-4-4.
Refer also to IEC 61000-4-5.
This test shall be performed in accordance with the requirements of IEC 61000-4-12 at a test voltage specified by
the manufacturer or at 1 kV peak (common mode) with frequency of 1 MHz; the test shall be repeated with a
frequency of 0,1 MHz.
The input level of the transmitters shall be held at a value which produces 50 % output signal.
The damped oscillatory waves are induced by means of a coupling network defined in IEC 61000-4-12.
During the test, any changes in output due to burst disturbance shall be recorded, as well as any damage caused to
the transmitter.
This test shall be performed in accordance with the requirements of IEC 61000-4-6 at a test voltage level
specified by the manufacturer or at 10 V r.m.s. unmodulated with frequency from 0,15 MHz to 80 MHz.
The input level of the transmitter shall be held at a value which produces 50 % output signal.
The conducted sine-wave RF-disturbances are induced by means of a coupling and decoupling network defined in
IEC 61000-4-6.
During the test, any changes in output due to RF-disturbances shall be recorded, as well as any damage caused to
the transmitter.
Refer also to IEC 61000-4-2.
Refer also to IEC 61000-4-8.
The transmitter shall be exposed to a damped oscillatory magnetic field of 30 A/m (peak) with oscillation
frequencies of 0,1 MHz and 1,0 MHz or at a value specified by the manufacturer; the damped oscillatory magnetic
field shall be directed along the major axis of the transmitter.
The test shall be conducted at 10 % and 90 % of the input span. The changes shall be calculated and reported as a
percentage of the output span. The effect of the field on the ripple content of the output shall be determined.
The test shall be repeated with the magnetic field directed along two additional axes mutually perpendicular and
perpendicular to the first.
For further consideration, refer to IEC 61000-4-10.
For further consideration, refer to IEC 61000-4-3.

60770-1 © IEC:2010 – 13 –
Table 3 – Additional tests for pneumatic transmitters
Designation Notes on test methods and on Reference Additional information
information to be reported
Air consumption Record the input which produces the IEC 61298-2
maximum air consumption in m³/h
(at reference conditions of 0 °C
and 101,3 kPa)
Output load Air bled from/into transmitter with input IEC 61298-3
set at 10 %, 50 %, and 90 % of the span.
See Figure 5 of IEC 61298-2
Air supply pressure Nominal reference supply pressure varied IEC 61298-3
variations from +10 % to –15 %
Air supply pressure Interruptions of the supply for 1 min at IEC 61298-3
interruptions 90 % input. Report time to recover after
the re-application of the supply
8 Other considerations
8.1 General
Additional tests may be carried out in order to verify some other characteristics of the
transmitter, such as the safety and degree of protection provided by the enclosure.
In order to prepare the general information required for the test report, procedures for
• installation,
• routine maintenance and adjustment,
• repairs and overhaul,
shall be examined through the actual performance of the required operations. This shall be
performed in accordance with the manufacturer's instructions, so that an evaluation of the
instructions can be carried out concurrently.
8.2 Safety
Electrically powered transmitters shall be examined to determine the degree to which its design
protects against accidental electric shock (see IEC 61010-1).
8.3 Degree of protection provided by enclosure
If requested, tests shall be made in accordance with IEC 60529 and IEC 61032.
8.4 Documentary information (see IEC 61187)
All the relevant publications supplied by the manufacturer, automatically and on request, shall
be listed.
If they do not contain a clear description of the operation of the transmitter, together with
adequate diagrams, or, if they do not contain an adequate parts list and specification, the
nature of the inadequacy shall be stated.
Additionally, any certificates indicating the degree of intrinsic safety and flame-proofing, etc. of
electrically powered transmitters shall be listed.
This information shall give details of the certificate numbers and the degree of protection
provided.
– 14 – 60770-1 © IEC:2010
8.5 Installation
The transmitter shall be installed and set to work according to the manufacturer's instructions.
The choice of installation tested shall take account of the various applications which may be
met in practice and which require differing procedures.
The method of mounting specified by the manufacturer should be reported. Any restrictions on
the use of the transmitter caused by this method of mounting shall be stated with explanations.
Any other aspects that are considered relevant to the ease or difficulty of installation shall be
stated with explanations.
8.6 Routine maintenance and adjustment
The operations considered necessary for routine maintenance and adjustment shall be carried
out in accordance with the manufacturer's instructions.
Any aspects that are relevant to the ease or difficulty experienced in order to perform these
operations shall be stated, giving reasons.
8.7 Repair
It is usual for transmitters to be capable of division into a number of subassemblies and for
manufacturers to detail repair procedures in terms of the removal and replacement of such
subassemblies. These subassemblies may be suitable for further dismantling by users. To
assess the ease with which repairs may be carried out, the subassemblies should be removed
one at a time, each being dismantled to the extent that is permissible according to the
manufacturer’s instructions.
Any aspects which are relevant to the ease or difficulty experienced in order to perform these
repairs shall be stated, giving reasons.
8.8 Protective finishes
The protective finishes on external parts specified by the manufacturer shall be listed with
relevant comments.
8.9 Design features
Any aspects of design or construction likely to cause difficulties in use shall be listed with
reasons. So also should any features which appear to be of particular interest, for example, the
degree of enclosure of the working parts, interchangeability of spares and weatherproofing.
8.10 Variants
Important variants or options listed by the suppliers shall be described in the report.
8.11 Tools and equipment
Tools and equipment essential to the installation, maintenance and repair shall be listed.
9 Test report and documentation
A complete test report of the evaluation shall be prepared in accordance with IEC 61298-4 after
the completion of the tests.
All the original documentation related to the measurements made during the tests shall be
stored by the test laboratory for at least two years after the report is issued.

60770-1 © IEC:2010 – 15 –
Annex A
(informative)
Analysis and classification of the instrument performance

A.1 Instrument model
A.1.1 General
The actual implementation of an instrument evaluation should be preceded by a structured
analysis of the physical and functional design of the instrument concerned. This analysis,
together with the requirements stated by the user, should lead to definition of the (transfer)
functions and properties to be evaluated.
These considerations are guided and facilitated by the following generic instrument model and
its description. The model block diagram shows the basic modules (building blocks) that can be
distinguished in a maximum configuration.
Human I/O
Power
input
Human
interface
Power supply
assembly
Sensor Output
Data processing
assembly unit subsystem
Electrical
Input(s)
output(s)
External system
interface
External system I/O
serial or parallel communication
IEC  1805/10
NOTE If the external system is present, see IEC 60770-3.
Figure A.1 – Instrument model
A.1.2 Sensor assembly
The sensor assembly converts the main input signal and possible auxiliary inputs into electrical
signals which are fed into the data processing unit.
The sensor assembly may be integrated with the other modules in one enclosure. It can also
be located remotely (in the case of a densitometer, electromagnetic flow meter, thermocouple
transmitter). Depending on the measurement principle used, the sensor assembly may not
require auxiliary (external) power (such as with thermocouples) or, it may require auxiliary

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...