MSA ALTAIR 4 Manual De Instrucciones página 482

MAINTENANCE
4.2 Live Maintenance Procedure - Replacing and Adding a Sensor
Before handling the PC board, the user must be properly groun-
ded; otherwise, static charges could damage the electronics.
Such damage is not covered by the warranty. Grounding straps
and kits are available from electronics suppliers.
Attention!
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.
Damage to the instrument 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.
• 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 middle position of the
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ALTAIR 4 - Operating Manual 10088160/00 Y-HLR
MSA
GB