Advanced Instruments Inc.
18
Establishing Power to the Electronics
The analyzer has been fully tested, the dual oxygen alarms set according to OSHA or
optional customer specifications, the battery fully charged and the oxygen sensor
installed prior to shipment. With one end of the power cable connected to the
analyzer’s terminals, as above which also includes the alarms and output connections,
connect the other end of the power cable to the appropriate source of AC power.
Procedure:
1. Remove the four screws located in the corners of the front panel.
2. Caution: Do not remove or discard the gasket from the front panel. Failure to
reinstall the gasket will void the NEMA 4 rating and RFI protection.
3. As discussed above, place the BATTERY/ PUMP switch in the ON position before
operating.
4. Without AC power the AC FAIL red LED will light up and flash.
5. Once the power cable is properly connected a suitable AC power supply:
¾ The digital LCD display responds instantaneously,
¾ The LOW BATT LED may come on if trickle charging is required
¾ The AC FAIL LED goes out
¾ The alarm LED’s light up, until calibrated the LED’s can be either
GREEN or RED in color
6. Close the unit ensuring the gasket is in place and tighten the screws.
7. Calibrate the unit as described below.
Battery Back-up
In the event of an AC power interruption or failure, the unit will continue to operate through the standby battery power
connected to the main circuit board. The AC FAIL red LED indicator will light and flash warning of the AC failure. The battery
backup will power the unit for 12 hours under the worst conditions (alarms on) and up to 48 hours (alarms off).
Caution: In the event of an AC power failure, users should correct the problem as quickly as possible and not depend on the
battery backup.
If the AC power is not restored within the time specified above, the battery will be drained to the point the LOW BATT red LED
indicator will light. At this time, we recommend either the AC power be restored or disconnecting the battery from the main
circuit board to prevent permanent damage to the battery.
The battery is a 12V sealed rechargeable lead-acid battery and is continuously trickle charged to keep the battery functional at
all times. The battery has a finite life of approximately 3-5 years and should be replaced periodically.
Recommendation: Assure the battery is in good operating condition by periodically disconnecting the AC power and operating
the unit for several hours under battery power verifying the various functions of the unit are operational and alarm indicators
operate as intended.
Caution:
Continuous use of the analyzer beyond the low battery warning may result in permanent damage to the battery.
Display Mode
The GPR-35 has a single safety related purpose and thus has been designed accordingly as a single range analyzer with a single
display mode.
(40 pages)
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