RKI Instruments GD-K8A - Manual (Page 15)

Model GD-K8A Diffusion Detector Head • 11
4. Loosen the two screws that secure the sensor bracket to the housing, then remove the
sensor unit from the housing.
5. Remove the two screws on the back of the sensor bracket that secure the sensor to the
bracket and remove the sensor with amplifier from the bracket.
6. Disconnect the ASK from the amplifier. A cable leading from the ASK plugs into a
connector near the top of the amplifier.
7. Remove the screw near the top of the amplifier that secures the amplifier to the sensor
and disconnect the amplifier from the sensor.
8. Connect the amplifier to the new sensor and secure it with the screw you removed in
step 7.
9. Reinstall the sensor to the sensor bracket.
10. Reconnect the cable from the ASK to the amplifier.
11. Reinstall the sensor bracket to the housing.
12. Turn on power to the controller and turn on the controller.
13. Allow the new sensor to warm-up for at least 2 hours.
14. Calibrate the GD-K8A as described in the Calibration section.
Replacing the Alkaline Batteries in the ASK
NOTE: Change the alkaline batteries with the controller on and the GD-K8A on
power and operating. If power to the GD-K8A is turned off to change the
alkaline batteries, the gas readings may be unstable for a short time when
power is restored.
1. Open the housing door.
2. Carefully remove the old alkaline batteries from the ASK in the upper part of the
housing. Do not touch the ASK circuit board.
3. Carefully install the new alkaline batteries observing the proper battery orientation.
4. Close the housing cover.