2050/2060 Gas Monitors (5/04)
Page:
Instruction Manual
4.4 Equipment Required
The following tools and equipment will be required for
calibration:
- Jewelers Screwdriver
- Calibration Gas
- Calibration gas delivery system
For accurate calibration use a gas mixture at the re-
quired concentration mixed in an air balance, rather
than with an inert gas like nitrogen. This gas and the
required delivery equipment such as the Model 1200-
26 Calibrator is available from Sierra Monitor Corpo-
ration.
4.5 Alarm Calibration Procedure
1.
The monitor should be in the safe condition prior
to calibration (green LED “ON”).
-
Be sure that the area is non-hazardous be-
fore proceeding.
2.
With the monitor in operation, expose the sensor
to a sample of calibration gas. Apply calibration
gas directly to the sensor insuring that the delivery
cup loosely covers the sensor. Use 80 PPM H
2
for
the Model 2050 and 150 PPM CO for the Model
2060.
3.
The red LED on the face of the monitor should turn
"on". If the alarm occurs within 18-20 seconds and
stops within one minute of the removal of the cali-
bration gas, the monitor is in calibration and re-
quires no further adjustment.
4.
If the monitor fails to alarm within 90 seconds of
the application of the gas adjust the potentiometer
counter clockwise until the alarm turns "on".
5.
If the monitor fails to stop alarming within one
minute of the removal of the gas adjust the poten-
tiometer clockwise until the alarm stops.
6.
After adjustment, repeat steps 4 and 5 to verify cali-
bration.
7.
When the calibration is complete, reconnect any
alarm equipment as necessary.
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