Analytical Industries GPR-35 Oxygen Analyzer - Manual (Page 15)

Advanced Instruments Inc.
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Caution: To maintain the NEMA rating of the enclosure the user must seal all conduits in accordance with applicable local
requirements. Additional penetrations to the enclosure may only be made by U/L or CSA certified personnel.
Caution: Compliance with CE certification requires installing power and signal output cables through separate metal conduit.
Signal Outputs
The analyzer provides a 0-1V full scale signal output and an optional isolated 4-20mA signal output for external recording
devices. With the 4-20mA option, an integral IC on the main PCB converts the 0-1V signal with negative ground to a 4-20mA
fully isolated signal. A finer adjustment of the zero offset of the 4-20mA converter can be provided by a potentiometer mounted
on the main PCB Assembly. Consult factory for instructions. Caution:
The optional integral 4-20mA converter is internally
powered and does not require external power. DO NOT supply any voltage to either of the two terminals of the 4-20mA
converter.
Power Fail Alarm
A dry contact rated at 30VDC @ 1A is provided as a power failure alarm. The contact is normally closed but opens when the
power to the analyzer is switched off or interrupted.
Procedure:
1. Connect the lead wires from the external recording device to the male phone plug supplied with analyzer.
2. Note: Connect the positive lead to the center terminal of the male phone plug.
3. Insert the male phone plug into the integral female OUTPUT jack located on the side of the enclosure.
Sensor Fail Alarm
A 5V output with negative ground is provided when the sensor is operational. The output is 0V when the sensor fails and its
output goes to zero.