Critical Environment Technologies GEM-II, Руководство по эксплуатации

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18 © 2014 All rights reserved. Data subject to change without notice.
GEM-II - Operation Manual Rev. E | 2014.10
Temperature ( ° C or ° F)
Range -20°C to 40°C (-4°F to 104°F)
4.2 Remote sensor specifications
1. Remote sensor module: The remote sensor housing accommodates one catalytic or one solid-
state sensor. 2. Any 4-20 mA analog transmitters manufactured by CETCI (LPT-A or LPT series).
Combustible Gases
Type Catalytic
Response Time <10 seconds to 90% of signal response
Operating Temperature -10°C to 50°C (14°F to 122°F)
Repeatability ± 10% of set point
Life Span 5 years in air (under normal conditions)
Typical Gas Examples Hydrogen (H
2
), Propane (C
3
H
8
), Methane (CH
4
)
Refrigerants
Type Solid state
Response Time <120 seconds to 90% of signal response
Operating Temperature 0°C to 40°C (32°F to 104°F)
Long Term Drift < 5% signal loss / month at ambient temperatures
Repeatability ± 10% of set point
Life Span 5 years in air (under normal conditions)
Typical Gas Examples
R11, R12, R22, R134A, R404A, R407C, R410A, R422A, R422D,
R438A, R507A
4.3 Calibration extending firmware (Cef) and sensor aging
GEM systems with integral electrochemical sensors have been programmed with our CEF
(Calibration Extending Firmware). This firmware takes into consideration the aging of the
electrochemical CO, NO and NO
2
sensors so that less frequent calibrations are acceptable in
non-critical applications such as parking garages. The system tracks the age of the sensor and
automatically compensates for the degraded output of the sensor as it ages.