Teledyne 3300ZB Sensor Installation or Replacement, When to Replace a Sensor

Maintenance Model 3300ZB

To open the spare fuse compartment, push on one end until it slides out.

4.Remove the bad fuse and replace it with a 5×20 mm 0.5 A, 250 VAC, IEC, time lag (T) fuse (P/N F1128) for AC units.

5.Replace the fuse holder into its receptacle, pushing in firmly until it clicks.

5.2Sensor Installation or Replacement

5.2.1 When to Replace a Sensor

The sensors used in this product will typically last five years or longer in service. Typically, the sensors will fail either high or low. Inaccurate or erratic readings are a sign that one of the sensors may have failed. In most cases, we recommend the entire unit be returned to an authorized Teledyne Service Center for sensor replacement.

To replace the sensor, refer to Figures 5-2 and 5-3 and follow the procedure below:

1.If required, purge the lines with nitrogen to remove any toxic or combustible gas from the cell.

2.Remove power from the instrument. Wait at least 1/2 hour to allow the sensor to cool.

3.Unscrew the collar to separate the sensor cap from the sensor block. See Figure 5-3 (A).

4.Carefully lift up the ZrO2 sensor off the PCB and replace with a new sensor. Align the tab of the sensor with the tab shown on the silkscreen of the sensor PCB as shown in the inset of Figure 5-3

(B). Make sure the pins on the sensor mate properly with the sockets on the PCB. Without touching the membrane surface, push the sensor down until the pins seat in the sockets.

5.Replace the cap and screw the collar onto the block threads.

6.Apply power to the analyzer and flush the sensor block with nitrogen for 20 minutes to remove trapped air.

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