Compur Ex plus Gas Detector User Manual download pdf (Page 26)

Maintenance and Calibration Triple Plus+ and Triple Plus+ IR

VII. Maintenance and Calibration

Crowcon recommends monthly gas response checks and a recalibration interval

of 6 months. Flammable sensors will respond to hydrogen and most hydrocar-

bons but will only be calibrated for a specific gas, typically methane.

Note:

when the instrument is placed into a charger or charger/interface which is fit-

ted with the new LIBRA lithium-ion battery pack the unit will turn off and start charg-

ing. If performing calibration or maintenance work, turn the instrument on when

fitted into the charger or back on again if switched off when placed in the charger.

7.1 Recalibrating

Read about the ‘CALIBRATE?’ option in SETTING UP (CALIB) and the CALIBRATE

functions in Portables PC software as either method may be used to adjust gain

values, but a knowledge of both is helpful.

Zero the unit in clean air. Locate the aspirator flowhead under the ledge above

the sensor panel and secure with the half-turn fasteners.

Starting with flammable gases and moving on to toxic, connect the appropriate

cylinder of test gas to the inlet of the flow head via a flow meter. Direction of

flow is marked on the flowhead. Adjust the control valve on the flow meter to

achieve a flowrate of 0.5 litre/min.

Wait until the reading has stabilised on the Triple Plus+/Plus+ IR display before

programming in the new level. Now shut off the valve and disconnect the

supply of test gas. Aspirate fresh air through the flowhead using the rubber

bulb until the reading has returned to zero. If there are signs of cross sensitivity

between two or more sensors, wait for all readings to settle before proceeding

with calibration of other channels.

For units with both %LEL (pellistor) and %Volume (flammable sensors) see note

at end of ‘CALIB’ Section 3.2 (p13).

7.2 Replacing the Lead-Acid Battery Pack

To change the battery pack, ensure you are in a safe, non-hazardous area.

Unscrew the tamperproof screws which retain the battery hatch using a 2 mm

Hex. key. Remove the hatch and tip the battery pack out. Disconnect the spade

terminals. When refitting, be sure to observe the correct polarity; red wire to

positive, black to negative. Replace the battery pack and hatch and secure with

the tamperproof screw. Crowcon recommends fitting the new Li-ion battery

pack when replacing a lead-acid battery that has reached the end of its useful

life. Alternative batteries, other than the Crowcon Li-ion battery pack, should not

be used because they will invalidate approvals and may impair performance.

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Compur Ex plus Gas Detector User Manual Page 26