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

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 affected, wrong readings could occur, and persons relying on
this product for their safety could sustain serious personal injury or death.
WARNING!
Before handling the PC board, ensure you are properly grounded; otherwise, 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 sensors, 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/conduc-
tive 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 noting the orientation
of the sensor gasket.
(3) Gently lift out and properly discard the sensor to be replaced.
a) 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.
a) Ensure tab on sensor aligns with groove at top of holder.
b) Insert the toxic sensor by placing it in the left-hand position of the sensor holder.
c) Insert the O
d) Insert the combustible sensor by placing it in the middle position of the sensor holder.
e) If any sensor is not to be installed, ensure that a sensor plug is installed properly in its place.
(5) Reinstall the case front.
(6) Reinstall the screws.
a) Tighten each screw with a torque value of 6.00 in-lbs (+/- 0.25 in-lbs) or 0.678 Nm
(+/- 0.028 Nm) to maintain the device's IP 68 rating.
(7) Turn on the device.
If the sensor replaced is the same as the previous
sensor:
• The device starts up normally.
• The device automatically senses that a new
sensor is installed and displays the "SENSOR
DSCVRY" screen.
sensor by placing it in the right-hand position of the sensor holder.
2
ALTAIR
If the sensor replaced is not the same as the
previous sensor or this sensor channel was deac-
tivated:
• The device automatically senses the differ-
ence and displays "SENSOR CHANGE".
• "ACCEPT?" appears on the display.
Accept the change with  button or
–
reject with  button.
– Go into the sensor setup and turn on
the appropriate sensor ( chapter 3.4
"Sensor Setup").
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4XR
Maintenance
US
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