Honeywell Sensepoint XCD Gebrauchs- und Pflegehandbuch

Calibration Guide

Sensepoint XCD

Calibration Handbook

123Sensepoint XCD

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.

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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:

Gas Type Flow rate (L / Min)

Air or N2 for Zero 0.5 to 1.0

Flammable CAT 1 to 1.5

O2 0.5 to 1.0

H2S 0.5 to 1.0

CO 0.5 to 1.0

H2 0.5 to 1.0

NO2 0.5 to 1.0

Flammable IR 0.4 to 0.6

CO2 IR 0.4 to 0.6

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

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Calibration Handbook

124 Sensepoint XCD

Zero Calibration

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 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 center 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. Put 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).

8. If using zero-air, turn it off. Zeroing is complete and saved.

9. The display shows ‘SPAn’ with ‘YES’ ﬂashing.

10. If span calibration is required use ‘✓’ proceed to the next step. If span calibration is not required, use ‘ !’

to select ‘No’ and ‘✓’ to return to conﬁguration mode.

Calibration Handbook

125Sensepoint XCD

Span Calibration

11. The display shows the current calibration span gas concentration while ﬂashing the ‘ ’ icon. Use ‘ !’ to

change the calibration span gas concentration, and ‘✓’ when required span calibration level is set.

12. The display will show the current gas reading, and the ‘ ’ icon ﬂashes.

13. Connect the regulator to the span gas cylinder.

14. Apply the span gas to the sensor using the Sensepoint XCD Gassing Cap.The live gas reading is displayed.

When the reading is stable, use ‘✓’ to conﬁrm span calibration.

15. If the sensor has been replaced the following display may be shown.

16. Use ‘ !’ to select ‘YES’ if the sensor has been replaced or ‘No’ if it has not been replaced.

17. If the span calibration is successful the instrument will brieﬂy display ‘SPAn PASS’ (if fails ‘SPAN FAIL’

displayed and returns to conﬁguration mode).

NOTE

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18. The display alternates between “Purg gAS” and the gas reading to indicate that the unit is expecting the

span gas to be removed from the sensor.

19. Promptly switch off the calibration span gas and remove the Sensepoint XCD Gassing Cap from the

sensor to allow the gas to disperse.

Calibration Handbook

126 Sensepoint XCD

20. When the reading falls below 50% of the calibration gas level the display indicates a countdown (up to

180 seconds dependant on gas type).

21. When the countdown is ﬁnished, the calibration procedure is complete.

22. The instrument returns to the ‘Set CAL’ menu. Activate the ‘ ’ or ‘!’ switch to select another menu or

select ‘QuIT’ to return to normal monitoring mode.

NOTE

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Zero and Span Calibration of Hydrogen Sulﬁde sensors

Hydrogen Sulﬁde sensors can be affected by extreme humidity changes. A sudden increase in ambient humidity

can result in a short-term positive drift in the instrument’s reading. A sudden decrease in ambient humidity

can result in a short-term negative drift in the instrument’s reading. These are most likely to be noticed during

calibration with dry or cylinder gas.

When calibrating Hydrogen Sulﬁde cartridges the following should be taken into account while following the

Span/Zero procedure:

1. To zero the sensor, use a compressed air cylinder of 20.9%Vol oxygen (not Nitrogen). Do not use

background air.

2. Apply the gas to the sensor for three minutes before using ‘✓’ to conﬁrm the zero calibration.

3. If a span calibration is to be performed, the span calibration gas should be applied to the sensor immediately

after the zeroing procedure. Do not allow the sensor to return to ambient air conditions between steps

2 and 3.

4. Apply the span gas for two minutes before using ‘✓’ to conﬁrm the span calibration.

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