Compur Ex plus Gas Detector User Manual download pdf (Page 27)

Triple Plus+ and Triple Plus+ IR Maintenance and Calibration

7.3 Fitting the Lithium-ion Battery Pack

The Li-ion battery pack may be used with ATEX/IECEx certified instruments. Approval

is pending for the use of the Li-ion battery pack with UL certified instruments.

To change the Lead-acid battery pack to a Li-ion battery, ensure you are in a

safe, non-hazardous area. Unscrew the tamperproof screws and remove the

hatch and battery as in Section 7.2.

Remove the Li-ion pack from the box, connect the terminals as indicated on the

new pack and place the bottom edge of the hatch into the base unit. Close the

hatch and fasten the screws.

N.B. ENSURE THE NEW PACK IS CHARGED FOR AT LEAST 12 HOURS PRIOR

TO FIRST USE.

7.4 Replacing a sensor module

Disconnect the battery pack. Unclip the shoulder strap and remove the two

upper case fixings with a 3 mm Hex. key. Lift the lid assembly from the base

and lay the instrument on its side, lid face down. Remove the two lower case

fixings, and then two more next to the D-rings Then split the halves, and lay

them alongside the lid. All circuit boards should now be facing up.

Identify the sensor module to be replaced and disconnect the flexible pcb from

it by lifting the shroud from the header and pulling gently on the tail. Remove

the two Pozi-drive screws and the old sensor module.

Remove the old gasket/membrane assembly. Fit the new components accord-

ingto a reverse of the above procedure ensuring that the shroud is pushed

home over the header to grip the flexible pcb tail securely. Fit the lower case

shells together ensuring that the strap pins and captive nuts are located in the

recesses of the side flanges, and that the gasket strip has not been displaced.

WARNING:if the nuts are slightly rotated and not sitting deep in the recesses,

the case halves will be wedged apart allowing moisture to enter the instrument.

Taking care not to trap any of the leads, push the lid back onto the base and

secure with the fasteners. Reconnect the battery pack.

Triple Plus+/Plus+ IR sensor modules are supplied from the Crowcon factory and

will identify themselves to the instrument when it is switched on. New sensor

modules require calibration when fitted to a new instrument.

If any further maintenance is required, the instrument should be returned to

Crowcon or a Crowcon Service Agent.

7.5 Back-up memory

Crowcon recommend that an instrument is turned on for at least 2 hours each

month to retain back-up memory.

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Compur Ex plus Gas Detector User Manual Page 27