ATP ZX-1A Heated Pentode Manuel De L'utilisateur page 15

As described above in the Operating Features section, the unit's circuit will automatically diag-
nose and indicate the sensor's status.
If an "Old Sensor Indication" is received, you should obtain a new sensor as soon as possible.
Ensure that you have a replacement sensor (see the Replacement Parts section on page 17 for
the correct part number) before proceeding.
If a failed or missing sensor indication is received:
1. Remove the flexible probe by firmly grasping it and rotating counter-clockwise. This will
expose the sensor in the end of the unit (see Fig 7). Verify that the sensor is installed.
A. If a sensor is present proceed to step 2.
B. If no sensor is present, skip ahead to step 3.
CAUTION: The sensor is heated to high internal temperatures during operation and
consequentially, the sensor case becomes hot. Use caution when removing the
sensor – it is preferable to allow the unit to remain powered off and at rest for at least
5 minutes before removing the sensor.
2. Remove the old sensor by firmly grasping under the flange and pulling straight away from the
unit. Discard the old sensor.
3. A new sensor comes packaged in a hermetically sealed foil bag. Open the bag and remove
the sensor.
4. Hold the unit with the front end facing you and note the sensor connection inside the threaded
bushing on the end of the unit. Note that there are five (5) holes corresponding to the five (5)
pins on the sensor – three (3) on the left and two (2) on the right (refer to Fig. 8).
Unit
14
Sensor
FIG 7