Apex Calibration Procedure - Honeywell VA201T Calibration Handbook

Apex Calibration Procedure

The following equipment is required:
Flow Housing accessory (Part No: 2110B2140) - fitted with rubber seal and supplied with loose hydrophobic
filter
Test gas
Regulator
NOTE
Zero gas and Span gas should be at roughly the same humidity levels to avoid erroneous cell responses.
A hydrophobic filter is supplied loose with the Flow Housing which must be fitted when calibrating sensors
with flammable gas cartridges.
When calibrating sensors fitted with other cartridge types then the filter mounted in the sensor cap for normal
gas sensing operation (if one was used) should be fitted to the Flow Housing.
1. At the Certified Sensor remove the cap or accessory.
2. If calibrating a sensor with a non-flammable gas cartridge remove the filter, if fitted, from the sensor cap/
accessory and fit it to the Flow Housing.
If fitted, the filter is held in place in the cap/accessory by its three lugs. Carefully pry the filter free from
the lug location points in the cap or accessory.
If calibrating a sensor with a flammable gas cartridge fit the hydrophobic filter supplied with the Flow
Housing into the housing.
In either case, to fit a filter into the Flow Housing, first remove the factory-fitted seal from the Flow Housing.
The seal is held in place in the housing by its three lugs. Carefully pry the seal free from the lug location
points in the housing.
The filter then locates in the Flow Housing in the same way as the removed seal. Ensure that the filter
is placed in the Flow Housing the correct way round with the three lugs closest to the front face of the
housing (where the gas pipes exit) and correctly engaged in the location points.
3. Fit the Flow Housing onto the Certified Sensor body.
Apex Transmitter and Sensor
Filter
Filter Lug
Location
Calibration Handbook
Sensor Body
Lug (3X)
Sensor Cap
or Accessory
45