HP T100 Operations Instructions download pdf (Page 14)

6. Error Signals

Error Possible Cause Elimination

Transmitter does not respond No supply voltage Connect data cable or power pack

Incorrect serial interface type Remove rubber stoppers on rating

or incorrect address set plate side and set address switch to

the serial interface to be used

and/or set the correct address

(see Section 3.3.).

Transmitter defective Replace transmitter

A too high measuring value is High transmitter degassing Degas (see Section 5.)

printed out in the high vacuum

Adjustment necessary, Re-adjust (see Section 4.1.)

contamination

Transmitter defective Replace transmitter

Deposits on the electrode of the hot cathode tubes can cause instability in the

measurement signals and lead also to increased desorption in the ultra high vacuum range

which, in turn, can lead to a too high measured pressure.

In such cases it is desirable, at pressures of below 1.5 x 10

-6

Torr (2 x 10

-6

mbar), to clean the

anode of the transmitter by baking out the adsorbed gas particles. This is carried out (via the

connected measuring unit) by starting the Windows Software DokuStar in accordance with

the

communication instructions relating to the degassing procedure. In this way the anode is

warmed up by ohmic heat up to 800 °C (1500°F). Although baking out lasts approximately 3

minutes, the process can be discontinued at any time beforehand.

No transmission of measurement values is possible during the time the transmitter is in

degassification mode.

5. Degas

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HP T100 Operations Instructions Page 14