PureAire Monitoring Systems, Inc.
10/25/07
16
5: Maintenance & Calibration
Maintenance and calibration should be performed only by qualified personnel.
5.1 Sensor Calibration
The
Air Check
✓
EX
system requires periodic calibration with the appropriate
standard gas. Calibration should be performed whenever 6 to 12 months has
passed.
5.1.1
Optional Calibration Equipment
The following equipment is available from PureAire to facilitate gas calibration:
Part Number
Description
Quantity
6D360248 **
Span Gas, specify gas 50% LEL in Air
1 btl 103 liters
CZF7R000255 **
715 Regulator 500cc/min flow
1 ea.
83505
Calibration Cap for LEL Sensor Cell
1 ea.
** Contact Calgas Div of Air Liquide Ph: 800-638-1197
5.1.2 Entering the Calibration Mode
The
Air Check
✓
EX
features a magnetic keypad, which permits one-man, non-
intrusive calibration. All zero and span adjustments can be made without
removing the cover of the enclosure housing.
To place the instrument in the Calibration mode, briefly hold the magnet over the
CAL key located on the lower left of the front panel. The left indicator arrow on
the upper left side of the LCD will light and the 4-20 mA signal will hold at 1.5
mA, indicating that the instrument is in the Calibration mode.
5.1.3 Zero Calibration
IMPORTANT: This procedure should be performed under normal monitoring
conditions, without any of the target gas present.
1.
Check the instrument’s gas concentration reading on the local display.
2.
If the display does not read a steady “0,” hold the magnet over the UP ZERO
or DOWN ZERO keys and adjust the reading for the correct zero value.
CAL Key
(magnetic)
Span and Zero
Adjustment Keys
(magnetic)
Left Indicator
Arrow
