4.2 Live Maintenance Procedure - Replacing and Adding a Sensor

CAUTION

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.

WARNING

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.

CAUTION

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.

NOTE: Ensure tab on sensor aligns with groove at top of holder.

• Insert the toxic sensor by placing it in the left-hand position of the sensor holder.
• Insert the O2 sensor by placing it in the right-hand position of the sensor holder.
• Insert the combustible sensor by placing it in the middle position of the sensor holder.
• If any sensor is not to be installed, ensure that a sensor plug is installed properly in its place.
5. If replacing sensor filters at this time:
• Carefully peel off old filters, taking care not to damage the inside of the case.
• On new filters, peel off backing exposing adhesive. Note proper orientation of each filter and apply to inside of front case adhesive side against case.
• Press filter into place taking care not to damage filter surface.
6. Reinstall the sensor gasket in the case front.
• Ensure sensor gasket is properly installed.
7. Re-install the screws.
8. Power ON the instrument. The instrument automatically senses that a new sensor is installed and displays the "SENSOR DSCVRY" screen. If the sensor replaced is the same as the previous sensor, the instrument starts up normally. Proceed to step 10 and calibrate the instrument.
9. If the sensor installed is not the same as the previous configuration, the instrument automatically senses the difference when it is turned ON via "SENSOR CHANGE" on the display and prompts the user to accept or reject the change. "ACCEPT?" appears on the display. The left ▼ button accepts or the right ▲ button rejects the change. Go into the sensor setup and turn ON the appropriate sensor after being prompted for a password. Refer to sensor setup see Section 3.4.1. for more details.
10. Calibrate the instrument after the sensors have stabilized.

Allow sensors to stabilize at least 30 minutes before calibration.

WARNING

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