MSA S5000 - Passive Sensor Replacement and Troubleshooting; 6.4 Replacing a Passive Sensor; 6.5 Troubleshooting

6.4 Replacing a Passive Sensor (Cat Bead or MOS)
When the passive Catalytic Bead or MOS sensor is damaged or gradually losing sensitivity and eventually fails to respond to
gas adequately or fails to pass calibration, the sensor needs to be replaced.
The mounting threads of the sensor head may require lubrication. Grease must not be used. As an alternate, PTFE (Teflon)
tape may be used on sensor threads.
To replace the passive sensors:
1. Declassify the area and make sure there is no hazardous gas/vapor present.
2. Power down the S5000 transmitter.
3. Unscrew the lid.
4. Remove the User Interface Module.
5. Refer to the sensor wiring diagram label inside the S5000 transmitter to locate the sensor connector and unplug it from
the transmitter.
6. Unscrew the sensor head until it is totally off. Guide the sensor wires so they will not get caught by the internal parts of
the S5000 while sensor head is turning.
7. Guide the connector and wires of the new sensor head through the conduit entry for sensor. Do not plug in the sensor
connector at this time.
8. Screw in the new sensor head. Guide the sensor wires so they will not get caught by the internal parts of the S5000 while
sensor head is turning.
9. Verify the sensor connector wiring against the wiring diagram.
10. Plug in the connector to the indicated header and make sure they are mated correctly.
6.5 Troubleshooting
Table 17 Troubleshooting
Fault Code Latch Description Action
ER01 Main Board
Communication Error
Non-Latch This fault indicates the
communication between the
main board and the display
module is abnormal.
Ensure the display module is properly
seated in the board stack fully. Return
the unit to the factory or authorized
service center if the problem persists.
F001 Supply Voltage
Out-of-Range Fault
Non-Latch This fault occurs if the supply
voltage at the S5000 is below
+10.5VDC or higher than
31.5VDC.
Ensure that the supply voltage is
within the range of 12-30VDC at the
S5000.
F002 RAM Checksum
Error
Latch This fault indicates that the
contents of the S5000's
internal RAM memory have
corrupted.
Cycle the power to the unit. If the fault
persists, the unit must be returned to
the factory or authorized service
center for repair.
F003 Flash Checksum
Error
Latch This fault indicates that the
contents of the S5000's
program memory have
changed. This usually occurs
when powering the unit up
The unit must be returned to the
factory or authorized service center for
repair.
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6 Maintenance US