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MAINTENANCE
4.2
Live Maintenance Procedure - Replacing and Adding a Sensor
Before handling the PC board, the user must be properly grounded;
otherwise, static charges could damage the electronics. Such damage
is not covered by the warranty. Grounding straps and kits are available
from electronics suppliers.
Remove and reinstall sensors carefully, ensuring that the components
are not damaged; otherwise instrument intrinsic safety may be
adversely affected, wrong readings could occur, and persons relying on
this product for their safety could sustain serious personal injury or
death.
To add a sensor to an instrument that is not already equipped with a full
array of sensors, remove the sensor plug from in front of the formerly
unused sensor housing.
While instrument case is open, do not touch any internal components
with metallic/conductive objects or tools.
can occur.
(1) Verify that the instrument is turned OFF.
(2) Remove the four case screws, and remove the case front while
carefully noting 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 circuit 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
•
sensor holder.
•
Insert the combustible sensor by placing it in the right-hand
position of the sensor holder.
Ensure groove in combustible sensor aligns with tab at top of holder.
42
NOTICE
WARNING
NOTICE
Damage to the instrument
sensor by placing it in the middle position of the
2
ALTAIR 4 - Operating Manual
MSA
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