Live Maintenance Procedure - Replacing And Adding A Sensor - MSA ALTAIR 4X Operating Manual

Maintenance
4.2

Live Maintenance Procedure - Replacing and Adding a Sensor

Warning!
Remove and reinstall sensors carefully, ensuring that the components
are not damaged; otherwise device intrinsic safety may be adversely af-
fected, wrong readings could occur, and persons relying on this product
for their safety could sustain serious personal injury or death.
Attention!
Before handling the PC board, ensure you are properly grounded; oth-
erwise, static charges from your body could damage the electronics.
Such damage is not covered by the warranty. Grounding straps and kits
are available from electronics suppliers.
To add a sensor to an device that is not already equipped with a full array of sen-
sors, remove the sensor plug from in front of the formerly unused sensor housing.
While device case is open, do not touch any internal components with
metallic/conductive objects or tools.
Damage to the device can occur.
(1) Verify that the device is turned off.
(2) Remove the four case screws, and remove the case front while carefully not-
ing the orientation of the sensor gasket.
(3) Gently lift out and properly discard the sensor to be replaced.
Using fingers only, gently remove the toxic, combustible, or oxygen sensor
by gently rocking it while pulling it straight from its socket.
(4) Carefully align the new sensor contact pins with the sockets on the printed cir-
cuit board and pressing it firmly in place.
Insert the toxic sensor by placing it in the left-hand position of the sensor
holder.
Insert the O
holder.
Insert the combustible sensor by placing it in the middle position of the sen-
sor holder.
(5) Ensure groove in combustible sensor aligns with tab at top of holder.
If any sensor is not to be installed, ensure that a sensor plug is installed
properly in its place.
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sensor by placing it in the right-hand position of the sensor
2
ALTAIR 4X
MSA
GB