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The Compass's electrochemical heated diode sensor is located in the tip of the probe. This specialized sensor will operate for about 100 hours. When that amount of time has passed, or you feel you may have missed some refrigerant leaks, you should replace the sensor.
A reference refrigerant leak is also available separately (703-080-G1) to check your sensor's sensitivity. To change the sensor:
- Turn off the leak detector
- Locate the end of the probe and twist off (counter clockwise) the tip protector. Pull the sensor (the small "can" with the hole in the top) straight out to unplug it. If the detector was just on for a while, the sensor will be warm but it will not burn you
- Remove the replacement sensor from the protective foil package
- Carefully align the 3 leads (small wires coming out the bottom of the can) on the sensor with the 3 sockets in the end of the probe. Insert the leads into the sockets and gently press the sensor's leads into the end of the probe. NOTE: You must be careful not to bend the sensor leads because this can cause erratic operation (see Troubleshooting.)
- Take this opportunity to change the filter, too. (705-600-G1)
- Place the tip protector over the sensor and tighten snugly by turning the cap in clockwise direction, being careful not to over-tighten and damage the tip protector
 Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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