Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 29)

Advanced Instruments, Inc.
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14. If the transmitter is equipped with an optional integral sampling pump (positioned downstream of the
sensor) and a flow control metering valve (positioned upstream of the sensor), completely open the flow
control metering valve to avoid drawing a vacuum on the sensor and placing an undue burden on the
pump
Setting Alarms
The analyzer is equipped with two programmable alarm relays. The two alarms set points are user
adjustable and can be set either as LOW/HIGH, LOW/LOW or HIGH/HIGH.
Setting Alarm Delays
Alarm delay option allows the user to ignore the alarm should a sudden short spike in the oxygen reading
occurs.
Setting Alarm Bypass
The alarms bypass feature allows the user to bypass the alarm during trouble shooting/repair or test run.
However, once the alarm bypass is selected, alarm will remain disabled even if the oxygen reading is
over/under the alarm set point. The alarm will re-arm itself only after the fault condition has been reverted.
The alarms are automatically disabled during SPAN/ZERO calibration.
The relays are rated at 5A @ 250V.
CAUTION; When using these relays, do not exceed the recommended rating.
Power Failure Alarm
A relay contact that is normally energized (normally open) during operation, is closed if the power to the
analyzer is turned OFF.
The relay is rated at 5A @ 250V.
CAUTION: When using this relay, do not exceed the recommended rating.
Standby
The transmitter has no special storage requirements.
The sensor should remain inside of the sensor housing and connected to the electronics during storage
periods. Before turning the sample gas OFF, ensure that sample/bypass valve (if analyzer equipped) is at
the BYPASS position. This will keep the sensor isolated from ambient air and would be ready to use again
when required with very short down time.
NOTE: Under isolated conditions, some oxygen will diffuse into the sample system/sensor housing and the
sensor out will slowly climb up but after 2-3 hours, it will reach a Plato, generally less than 400 PPM
Store the transmitter with the power OFF at a safe location and away from a direct heating source.
If storing for an extended period of time, protect the analyzer from dust, heat and moisture.