Sensepoint XCD Technical Manual SPXCDHMANEN Issue 15
35
A compressed air cylinder (20.9 % v/v oxygen) should be used to perform the zero calibration if the
area where the detector is located contains any residual amount of the target gas. If no residual gas
is present, then the background air can be used to perform the zero calibration. Contact your
Honeywell Analytics representative for details of suitable calibration kits.
To calibrate the detector, follow the procedure below.
Note: The Oxygen sensor does not require a zeroing procedure. Background air (20.9 % v/v oxygen)
can be used to span the oxygen sensor in place of a compressed air cylinder (20.9 % v/v oxygen). For
oxygen sensors only do parts 1-4, 12, 13 (if compressed air cylinder is used), 14-17 and 22 of the
procedure below.
9.1.1. Zero Calibration
Note: When the Flammable-CAT sensor is replaced, it is necessary to re-initialize the baseline. Select
‘InIt bASE’ from the menu system.
1. If the ambient air is NOT considered reliable to use to set the ZERO, then remove the weather
protection and fit the Gassing Cap accessory (see chapter 3.2) onto the sensor and apply a
clean source of zero gas or compressed air.
2. To access the calibration menu, hold the end of the magnet over the switch located
at the top
centre of the detector display (
✓
) for at least 3 seconds and then remove.
3. The display will indicate the first configuration mode menu ‘SEt CAL’.
4.
Place the magnet over the ‘
✓
’ switch again and move to enter the Calibration menu.
5. The display will show the current gas reading, and the ‘ ’ icon flashes.
6.
When the zero gas reading is stable use ‘
✓
’ to confirm zero calibration.
7. If successful the display shows ‘ZEro PASS’ (if not successful, the display shows ‘ZEro FAIL’ and
returns to configuration mode).
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