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JJF 1366-2012 English PDF (JJF1366-2012)

JJF 1366-2012 English PDF (JJF1366-2012)

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JJF 1366-2012: Calibration Specification of Temperature Data Acquisition Instruments
JJF 1366-2012
JJF
NATIONAL METEROLOGICAL VERIFICATION
SPECIFICATION OF THE PEOPLE’S REPUBLIC OF CHINA
Calibration specification of temperature data acquisition
instruments
ISSUED ON: OCTOBER 08, 2012
IMPLEMENTED ON: JANUARY 08, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terminology ... 6
4 Overview ... 7
5 Metrological characteristics ... 8
5.1 Measurement error ... 8
5.2 Recording interval ... 8
5.3 Transmission interval ... 8
5.4 ON-OFF mode ... 9
5.5 Over-temperature alarm ... 9
5.6 Appearance ... 9
6 Calibration conditions ... 9
6.1 Environmental conditions ... 9
6.2 Power supply conditions ... 9
6.3 Measurement standards and other equipment ... 10
7 Calibration items and calibration methods ... 11
7.1 Calibration items ... 11
7.2 Checks before calibration ... 11
7.3 Calibration method ... 12
8 Expression of calibration results ... 16
9 Recalibration time interval ... 17
Appendix A Example of original calibration record format ... 18
Appendix B Format of inner page of calibration certificate ... 20
Appendix C Example for evaluation of measurement uncertainty (1) ... 21
Appendix D Example for evaluation of measurement uncertainty (2) ... 26
Calibration specification of temperature data acquisition
instruments
1 Scope
This Specification is applicable to the calibration of temperature data acquisition
instruments (hereinafter referred to as acquisition instruments), which have built-in
sensors AND a measurement range of (-50 ~ +150) °C, as well as outlay sensors AND
a measurement range of (-80 ~ +500) °C.
2 Normative references
This Specification cites the following documents:
JJG 617-1996 Verification regulation of digital temperature indicators and
controllers
JJF 1001-2011 General terms in metrology and their definitions
JJF 1007-2007 Temperature metrological terms and their definitions
JJF 1030-2010 Measurement and test norm of thermostatic bath’s metrological
characteristics
JJF 1101-2003 Calibration specification for the equipment of the environmental
testing for temperature and humidity
JJF 1171-2007 Calibration specification for temperature itinerant detecting
instrument
For dated references, only the dated version applies to this Specification; for undated
references, the latest edition (including all amendments) applies to this Specification.
3 Terminology
The terms and definitions, as defined in JJF 1001-2011 and JJF 1007-2007, as well as
the following terms and definitions, apply to this Specification.
3.1 Temperature data acquisition instrument
A temperature measuring instrument, which can be directly placed in the measured
environment for measurement; has the functions of automatically collecting the
5.4 ON-OFF mode
The acquisition instrument shall be able to set how it turns on and off. The turn-on mode
is fixed OR optional, such as immediate turn-on, time-fixed turn-on, time-delayed turn-
on, manual start, etc. The turn-off mode is fixed OR optional, such as turn-off are full
storage, first-in first-out, turn-off by numbers, manual turn-off, etc.
5.5 Over-temperature alarm
For an acquisition instrument, which has an over-temperature alarm function, the over-
temperature alarm shall be normal.
5.6 Appearance
5.6.1 For the acquisition instrument with local indication, its digital indication shall be
clear; there shall be no digital flickering, overlapping characters, garbled characters,
missing strokes; the indication of decimal point shall be correct.
5.6.2 The acquisition instrument, which can be used by putting into liquid, shall be
sealed without damage.
Note: All the above technical indicators are not applicable to eligibility judgment, only for
reference.
6 Calibration conditions
6.1 Environmental conditions
a) Ambient temperature: (20 ± 5) °C;
b) Relative humidity: Not more than 85%;
c) When the electrical measuring instrument has other requirements for
environmental conditions, it shall meet its specified requirements.
Note: If the above conditions cannot be met, the resulting uncertainty shall be considered.
6.2 Power supply conditions
The power supply shall meet the normal working requirements of the acquisition
instrument, measurement standard, constant temperature equipment under verification.
sensitive element immersed in the uniform temperature zone of the constant
temperature bath, meanwhile the influence of the ambient temperature is
negligible, it shall follow the requirements in 6.6.5 of JJF 1171-2007, to place the
temperature sensor in the constant temperature bath; the data acquisition part is
placed outside the constant temperature bath;
b) If the temperature sensor of the acquisition instrument is outlay type AND the
length of the sensor cable or the insertion rod is not enough to make the
temperature sensitive element immersed in the uniform temperature zone of the
constant temperature bath; OR although it can be submerged enough, the ambient
temperature cannot be ignored, due to the excellent thermal conductivity of the
immersion rod; OR when the temperature sensor is built-in and the data
acquisition part is not sealed, THEN, it shall be placed in the uniform temperature
area of the incubator, as a whole;
Note: In this case, the calibration temperature range of the outlay sensor acquisition
instrument is the same as that of the built-in sensor acquisition instrument.
c) For an integrally sealed acquisition instrument, the whole can be put into a metal
mesh bag AND immersed in a uniform temperature zone below 200 mm, from
the liquid medium level of the thermostat; OR the whole can be placed in the
uniform temperature zone of the thermostat.
7.3.5 Communication connection
For the acquisition instrument of wireless communication, after the installation of the
acquisition instrument is completed, it may turn on the communication receiver and the
PC, to establish the real-time communication connection, between the acquisition
instrument and the communication receiver and the PC.
7.3.6 Selection of calibration point
The calibration points shall be evenly distributed on the integral point of the entire
measurement range; in principle, it shall include the zero point, the upper limit value,
the lower limit value; there shall be no less than 5 points.
When the user has requirements, the calibration point can be selected, according to the
user's requirements.
7.3.7 Use of measurement standards
When using a standard mercury thermometer as the measurement standard, a reading
telescope shall be used to read its indication. When using a standard platinum resistance
thermometer as the measurement standard, its working current shall not be greater than
1 mA; the insertion depth shall not be less than 250 mm.
When using an incubator as a constant temperature source, the standard thermometer
shall be inserted vertically. At the same time, in order to reduce or eliminate the heat
exchange between the insertion hole of the incubator and the outside world, it shall use
cotton or other insulating materials, to plug the gap between the standard thermometer
and the insertion hole.
7.3.8 Calibration method
Keep the temperature of the incubator constant, at each temperature point to be
calibrated; the temperature deviation from the calibration point shall...
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