PureAire Monitoring Systems, Inc.
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5.5 System Calibration
The Air Check Methyl Bromide Monitor requires periodic calibration with the appropriate standard
gas. Calibration should be performed whenever:
Six months has passed without calibration
The sensor cell electrolyte is replaced
5.4.1 Gas Generation and Calibrating Kits
For generating a calibrating gas, the following supplies are recommended. They are available by
separate order.
ITEM PART NUMBER
DESCRIPTION
PACKAGING
1
*90202256 Span gas 5** ppm Bromomethane blended with air 1 bottle 105 liters
2 18102509** Demand Flow Regulator
1 each
3 232-05A*** Tedlar Sample Bag, 5 liter polypropylene fitting 1 each
* Purchase directly from: Absolute Accuracy Ph: 281-840-0781
** Purchase directly from: Industrial Scientific Ph: 800-338-3287
*** Purchase directly from SKC Ph: 724-941-9701
**** For higher range monitors please use order span gas concentrations that equal approximately ½ the
full scale value
5.4.2 Initial Preparation
NOTE:
If the instrument is connected to a controller, set the controller to Standby mode
to avoid accidental alarms.
NOTE:
If the monitor was powered off, it is recommended to warm up the Methyl Bromide monitor
for two hours before making any adjustments to the sensor.
5.4.3 Set Module Zero
NOTE:
This procedure should be performed in a gas free atmosphere.
NOTE:
Do not make any zero or span adjustments until the monitor has been operating for
a minimum of 2 hours with a freshly recharged Methyl Bromide Sensor cell. Failure to do so will
affect the calibration.
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