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Calibration
CGS-240 Manual 6/15/2021
Page 36 of 148
Max Immersion Depth
CALIBRATION
To ensure the best possible accuracy of the generator it is critical to perform routine calibration on the
temperature probes and the pressure transducers.
Apparatus and equipment, including technical performance requirements.
a. Pressure reference
•
Low range : Ambient to 25 psia, with ± 0.001 psia resolution or better, ± 0.005 psia accuracy or better.
•
High range : Ambient to 150 psia, with ± 0.01 psia resolution or better, ± 0.03 psia accuracy or better.
•
A stable gas supply (ambient to 150 psia) will be required to ensure the pressure transducers full range
is covered. There is no need to check or calibrate below ambient pressure.
b. Temperature reference
Readout with 0.01 °C or better resolution, temperature standard (SPRT
recommended) ± 0.03 °C or better accuracy. A temperature calibration
bath with liquid immersion usable range of -20°C to 72 °C.
Use of a non-
conductive liquid such as 3M Flourinert FC-770 is highly recommended .
Use of silicone oil is also suitable.
NOTE : DO NOT USE WATER as this may cause an internal short within
the probe if the probe is accidentally submerged below the interface
between sheath and cable. Leave approximately 1/4” of the probe
sheath unsubmerged to prevent liquid from contacting the interface.
c. Environmental conditions: Generally, the required environmental
temperature range during calibration is 23 ± 2 °C. The required
environmental relative humidity range during calibration is 5 to 95 %,
non-condensing.
5.1 PRESSURE CALIBRATION
Both transducers measure absolute pressure and must be calibrated in absolute pressure. G auge mode
calibration is not possible.
NOTE : If sending the sensors to an independent calibration lab, rather than performing the in-System
calibration, refer to Section 5.1.4 – Alternative Pressure Calibration Procedure .
Required Equipment
•
Stable pressure source, pressure range capable of:
o
Ambient to 25 psia for low range transducer
o
Ambient to 150 psia for high range transducer
•
Pressure controller and/or standard, detailed in section 5.
•
9/16” open end wrench.