Maintenance Procedure - Replacing or Adding a Sensor

Any factory-installed Series 20 sensor may be removed or replaced with another Series 20 sensor of the same gas type. Any XCell sensor may be removed or replaced according to the positions allowed in table after Figure 18 .

If the type of any sensor is to be changed, the device must be returned to an authorized service center.

WARNING! 

• The PID sensor may be replaced with an authorized MSA PID replacement sensor. If the PID sensor range is different than the previously installed sensor, the new configuration MUST be selected in the Instrument Options ® Sensor Setup screen prior to sensor replacement. Otherwise incorrect readings could occur and persons relying on this product for their safety could sustain serious personal injury or death.
• If your instrument was manufactured prior to July 2023, the firmware revision of the unit must be updated to revision v6.00.xx or higher prior to using the sensor included in Replacement Kit P/N 10242735. Failure to follow this warning may cause erroneous readings and could result in serious personal injury or death.
• 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.

 

Notice 

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.

 

While device case is open, do not touch any internal components with metallic/conductive objects or tools. Damage to the device can occur.

Figure 18 Possible positions for sensor replacement

1

Combustible sensor

4

See table below or a sensor plug

2

O2 sensor

5

PID sensor

3

See table below

 

 

SENSOR

OPERATIONAL ONLY IN POSITION

XCell combustible sensor

1

XCell Sensors: O2, CO/H2S, CO, H2S, CO-H2S-LC, CO-HC, CO/NO2, CO-H2/H2S

2
Series 20: NO2, PH3, HCN, CLO2, NO

XCell: SO2, H2S, H2S-LC

 3

XCell Toxic Sensors: CO/H2S, CO, H2S, CO/H2S-LC, CO-HC, CO/NO2, CO-H2/H2S, SO2, CL2, NH3

4

PID

5
1. Verify that the device is turned OFF.
2. Remove the battery pack.
3. Remove the two remaining case screws, and remove the case front.
4. Gently remove the sensor to be replaced.
5. Carefully align the new sensor contact pins with the sockets on the printed circuit board.
6. Press the new sensor into place.
7. Note the position restrictions in the table above.

Adapter (P/N 10110183) is required for XCell usage in position 3.

If a sensor is removed and will not be replaced, be sure to install a sensor plug in its place in order to maintain correct device function.

The plug for XCell positions is P/N 10105650.The Series 20 plug is P/N 10088192.

8. Visually inspect the green gasket, assuring that it is seated properly in the front housing.
9. Attach front case and tighten two case screws using 5.5 in-lbs of torque.
10. Attach the battery pack and tighten the two battery pack screws using 5.5 in-lbs of torque.

If a change in XCell Sensor configuration is detected during the device turn-ON process:

• The "ACCEPT?" prompt appears on the display
• The q button accepts the sensor configuration
• The p button rejects the sensor configuration; the device is not operational.

When an XCell sensor is replaced, the device automatically enables the sensor after the change has been accepted. If a Series 20 or PID sensor is replaced, it must be manually enabled ( Calibration, SETTING SENSOR OPTIONS).

If the oxygen sensor was replaced, see Special Consideration for Oxygen Sensor regarding the oxygen reading display.

11. Allow sensors to stabilize at least 30 minutes before calibration.
12. Calibrate device before use.

WARNING! 

Calibration is required after a sensor is installed; otherwise, the device will not perform as expected and persons relying on this product for their safety could sustain serious personal injury or death.