6
Service & Maintenance
32
Series 907 Analog Convection Transducer
Instruction Manual - #109070001
6.10 Replace the Sensor Tube
1.
Disconnect the power cable from the 907 Transducer assembly.
2.
Remove the two screws with a #1 Phillips head screwdriver.
3.
Use a 3/16-inch nut driver to remove only the right screw lock from the D- sub connector.
Carefully remove the front cover of the transducer case.
Figure 6-3: Sensor Pins
Figure 6-4: Calibration Adjustment points
6.10.1 Calibrate the New Sensor Tube
1.
Plug the new sensor tube into the electronics, and replace the one screw through the half
cover remaining, being careful not to over-tighten the screw which could crack the case.
2.
Install the partially assembled unit on a vacuum system, connect the D- sub connector, and
raise the system pressure to 760 Torr with air or nitrogen. Make sure that the transducer is
mounted horizontally, preferably with the port down.
3.
Operate the unit for at least 20 minutes.
4.
Connect a voltmeter to TP1 (-) and TP5 (+). Do not use the voltage at the output tip jack or the
analog output on the D-sub connector for this adjustment.
