User guide

Changing the Sensor

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 from INFICON to check your sensor's

sensitivity. (See Replacement Parts and Accessories.)

To change the sensor:

1. Turn off the leak detector.

2. 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.

3. Remove the replacement sensor from the protective foil package.

4. 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.)

5. Take this opportunity to change the filter, too. (see Changing the Filter.)

6. 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.

Removing/Replacing the Power Stick

The Compass uses a pre-assembled power stick. Do not attempt to disassemble it.

The power stick is connected to the circuit board via a miniature electrical connector. Slide the

old power stick out of the Compass and disengage the connector. Push the miniature connector

on the new power stick into the mating connector on the circuit board and slide the new power

stick into the Compass. Additionally, ensure the two halves are connected correctly, as the

connector is polarized and damage may result to either the battery or the Compass if attached

incorrectly.

Once the power stick is in place, close the battery compartment by sliding the compartment

cover over the detector's bottom housing until it latches. Ensure the wire leads on the power

stick are not pinched in the plastic housing. Plug the AC adapter into an electrical outlet and

allow 10 hours to fully charge the new power stick.

Cleaning the Compass Housing

The Compass plastic housing can be cleaned with standard household detergent or isopropyl

alcohol. Take care to prevent the cleaner from entering the instrument. Since gasoline and other

solvents may damage the plastic, protect your Compass from contact with these substances.