Sensepoint Xcd Calibration; Zero And Span - Honeywell VA201T Calibration Handbook

Sensepoint XCD Calibration

It is recommended to periodically carry out a gas response check on the Sensepoint XCD to ensure correct
operation. This may be done in two ways;
1. A simple Response Check often referred to as a "BUMP TEST" is a test using calibration gas applied to
the sensor via the nozzle of the Weather Protection or using the Sensepoint XCD Gassing Cap.
If a BUMP TEST is done via the Weather Protection nozzle it may be necessary in windy conditions to
increase the flow rate of the test gas by a further 1 LPM, OR, to shelter the weather protection from the
wind.
2. A full gas calibration of the sensor as described in the following section, using ONLY the Sensepoint XCD
Gassing Cap (Part No.: S3KCAL).

Zero and Span

CAUTION
Before initial calibration allow the detector to stabilize for 30 minutes after applying power.
When in zeroing and span calibration mode the current output from the detector is inhibited (default 2mA) to
avoid false alarms.
For Flammable gas calibration use a calibration gas concentration of between 25%LEL and 75%LEL to ensure
that the required accuracy can be attained.
&OR (YDROGEN 3ULlDE TYPE SENSORS REFER TO SECTION  BEFORE CONDUCTING ZERO AND SPAN CALIBRATION
To calibrate the detector, use an appropriate span gas cylinder, constant flow regulator AND the Sensepoint
XCD Gassing Cap. The flow rates used for calibration gas are as follows:
A compressed air cylinder (20.9%Vol 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
/XYGEN SENSOR DOES NOT REQUIRE A ZEROING PROCEDURE "ACKGROUND AIR  6OL OXYGEN CAN BE USED TO
SPAN THE OXYGEN SENSOR IN PLACE OF A COMPRESSED AIR CYLINDER  6OL OXYGEN  &OR OXYGEN SENSORS ONLY
DO PARTS     IF COMPRESSED AIR CYLINDER IS USED   AND  OF THE PROCEDURE BELOW
Sensepoint XCD
Gas Type Flow rate (L / Min)
Air or N2 for Zero
Flammable CAT
O2
H2S
CO
H2
NO2
Flammable IR
CO2 IR
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Calibration Handbook
0.5 to 1.0
1 to 1.5
0.5 to 1.0
0.5 to 1.0
0.5 to 1.0
0.5 to 1.0
0.5 to 1.0
0.4 to 0.6
0.4 to 0.6