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8.0 SIGNAL CURRENT CALIBRATION
This feature allows the user to calibrate the 4-20mA Analog Output Signal. A Multi-Meter can be
connected in series with the SIG (signal) wire to the controller.
1. Unlock the monitor using Command Code 25 and the User Password factory preset to
“1”.
2. Initiate calibration by entering Command Code 150. The unit will display the Raw Analog
Zero Count
3. Use Key number “1” to decrease or “2” to increase the Raw Zero Count.
4. When the Multi-Meter reads 4.0mA, the user may press Enter to confirm
5. The monitor then prompts 20mA and displays the Raw Count.
6. Adjust the Raw Count with keys “1” & “2” until the Multi-Meter displays 20mA. Press the
Enter key to confirm.
The typical Raw Count for 4mA should be approximately 190, and 950 for the 20mA.
9.0 GAS LEVEL INDICATORS
Sensor Failure:
The Universal Transmitter Card is designed to detect failures in the sensor cell and
electrical connections. If the cell’s output is diminished the signal voltage will be
driven outside the limits for normal operation. This will be detected and constitute a
sensor failure.
The monitor will go into Temperature Error if ambient temperature falls outside the
range –20 to +50 degree C.
LED Status Indication:
Normal Mode: One short green flash, 2-second interval
Alarm Level 1: One short red flash, 2-second interval
Alarm Level 2: Two short red flashes, 2-second interval
Sensor Fail: Alternating red-green, 1-second interval
Calibration Span: Constant red
Calibration Zero: Constant green
Output Signal Current:
Normal Mode: 4.0 to 20.0 mA, linearly proportional from zero to full scale range
Sensor Fail: 2.0 mA
Temperature Error: 4.0 to 20.0 mA, linearly proportional from zero to full scale range
Start Up: 4.0 mA
Calibration Mode: Holds last translated output signal level until calibration completion.
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