HP T100 Operations Instructions download pdf (Page 13)

4.3. Transmitter Equalization

Automatic alignment in the "ur" range (under range)

Starting with instrument version 010500, the alignment is run automatically while

simultaneously the following conditions apply:

– the pressure of the Bayard-Alpert component is < 5.0 • 10

-5

mbar.

– the measured value of the Pirani component does not change for one minute and does

deviate too much from the most recent calibration value.

Manually operated alignment when operations via display unit DPG 101 or DPG 109:

➡ Equalization of the transmitter as described in section 4.4. or 4.5. of the DPG instructions.

Manually operated alignment communication via RS 232 or RS 485:

➡ Evacuate the vacuum system to the pressure of p<1 x 10

-5

mbar.

➡ Set the adjusting pressure point

[

P:741] to «000» for low pressure and transmit.

➡ Transmit the actual pressure value (

[

P:740] with «000000» ) for low pressure

(represents p < 1.0 • 10

-5

); ==> ‘’ur’’ (under Range).

➡ Vent to atmospheric pressure with air or N

; afterwards wait about 10 minutes.

➡ Set the adjusting pressure point

[

P:741] to «001» for high pressure and transmit.

➡ Set the actual pressure value to the atmospheric pressure (e.g. «100023» for 1000 mbar).

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HP T100 Operations Instructions Page 13