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Sensor Regeneration
Sensor regeneration is needed to clear the 631-X sensor of any accumulated hydrogen sulfide.
This simple procedure should be done:
• At the beginning of the day on which the instrument is to be used.
• During the day when the sensor becomes saturated.
• At the end of the day before storing the instrument.
CAUTION:
Ensure the voltage selector on the back of the instrument, near the power
cord inlet connector, points to the local AC power value. See “Setting the
Input Voltage” on page 21.
To clean and protect the sensor, the supplied AC power must be 100 to 120
VAC or 220 to 240 VAC, depending on the available power source.
Once sensor regeneration is initiated, DO NOT interrupt the cycle.
• Attach the power cord to the 631-X and plug it into AC power. AC power is required to
thermally regenerate the sensor.
• Press the power ON button.
• Press the REGEN button.
The digital meter flashes .H.H.H for the duration of the 10-minute cycle and displays
.0.0.0 when the cycle is completed.
DO NOT INTERRUPT THIS CYCLE.
Wait until the cycle is completed before continuing with the next step.
• A minimum 30-minute wait after the sensor regeneration cycle is complete ensures
maximum sample accuracy. However, the unit can be used immediately following the
sensor regeneration if necessary. When the sensor regeneration is complete, press ZERO
and adjust the ZERO ADJUST pot until 0 appears on the display. Install the zero air
filter in the intake and take several samples or lock the instrument into survey mode (see
page 12). After approximately one minute, stop sampling and check the ZERO. Adjust
to 0. Repeat sampling through the zero air filter until reading remains on 0.
NOTE: The digital meter will read .P.P.P after REGEN is activated if the power cord is not
plugged in or if the instrument's fuse needs to be replaced. Connect the power cord, or if
necessary, replace the fuse. See “Changing the Fuse” on page 22.
Page 12 of 50 AZI Customer Service 800-528-7411 or 602-470-1414