YOKOGAWA GX70SM, Руководство пользователя, Страница: 67 / 181

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IM 04L57B01-01EN
How to Use the W
ireless Input Unit Configurator
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App
2.8 Calibrating the Universal Inputs and Built-in
Humidity Sensor
Periodically check the operating status of the GX70SM to use it in a good condition.
To maintain the measurement accuracy, we recommend that you calibrate it once a year.
YOKOGAWA dealers can provide calibration servicing. For details, contact your nearest
YOKOGAWA dealer.
2.8.1 Calibrating the Universal Inputs and Built-in Humidity Sensor
You can calibrate the universal inputs and built-in humidity sensor.
Required Instruments
To calibrate the universal inputs and built-in humidity sensor, you need references with the
following accuracy and resolution.
Recommended Instruments
DC voltage standard : Must meet the following specifications (M/9100 by FLUKE or
equivalent)
Voltage output range: 20 mV to 10 V
Output accuracy of output range: ±(0.01%+1 μV) or better
• Resistance standard : Must meet the following specifications (ADR3204 by Alpha
Electronics or equivalent)
Resistance setting range (resolution): 0.2 to 1999 Ω (0.001 Ω)
Resistance accuracy of the resistance setting range: ± (0.01% of + 2
mΩ ) or better
• 0°C standard temperature
device
: ZC-114/ZA-10 by Coper Electronics or equivalent
Main specifications
Standard temperature stability accuracy: ±0.05°C
• Temperature and humidity
sensor
: Must meet the following specifications (Rotronic temperature and
humidity sensor HC2 series and indicating measuring instrument or
equivalent)
Humidity accuracy: ±0.8%RH (at 23°C)
Temperature accuracy: ±0.1°C (at 23°C)
For information on purchasing these calibrators, contact your nearest YOKOGAWA dealer.
Universal Input Calibration Procedure
Procedure
1
Wire the GX70SM and the calibrator as shown in the following figure, and adequately
warm up the instruments.
Note: The wiring diagram is an example for the universal, 3-wire RTD/resistor type. For details on
wiring, see “Installation and Wiring” in the First Step Guide (IM 04L57B01-02EN).
2
Check that the operating environment such as ambient temperature and humidity is
within the standard operating conditions (see “General Specifications”).
3
Set the GX70SM operation mode to measurement mode.
For details on operation mode, see section 1.5.1, “Setting the Operation Mode”.