Analytical Industries GPR-28 Oxygen Analyzer - Manual (Page 22)

Advanced Instruments Inc.
22
Procedure:
1. Open the front door to access the DISPLAY SELECT slide switch located on the A-1107 PCB Assembly Main/Display.
2. Advance the selector switch to the ALM1 (high alarm) or ALM2 (low alarm).
3. The digital LED display will indicate the current alarm set point.
4. The alarm setpoint is expressed as a value.
5. Adjust the potentiometer a ½ a turn at a time to allow the electronic processing to catch up . . . until the display reads the
desired alarm setpoint value. Note: External alarm control actuators are optional and would be located on the outside of
the analyzer’s front door.
6. Caution: Use a small bladed screwdriver. No wrenches please!
7. Repeat to set the other alarm.
8. Once the alarm values are set, advance the DISPLAY SELECT slide switch back to OXYGEN position.
Note: Before concluding the sensor is not “coming down to expected ppb or ppm levels” or “is not responding to sample gas”,
please check and confirm the analyzer in the proper OXYGEN DISPLAY mode before contacting the factory.
Range Selection
The ppm analyzers are equipped with five (5) and the percent analyzer four (4) standard measuring ranges (see specification)
and provides users with a choice of sampling modes. The ranges available are indicated around the RANGE selector switch
(actuator) located in the center of the control panel under the digital LED display on the front of the analyzer, refer to the
illustration above under the Mounting the Analyzer section. Simply turn the RANGE selector switch to the desired range.
Installation is complete . . .