14
Operation
Activate/send parameter for low pressure (control command)
Low pressure adjustment (Parameter [P:741/740], Slave device address: "001")
Applied data types
6.4 Adjusting the transmitter
The transmitter is factory-calibrated. It may be necessary to calibrate the Pirani sensor
in the event of contamination, other installation positions, extreme temperature fluctua-
tions, ageing, etc. This is carried out using the "DokuStar" PC software via a connected
control unit or according to customer requirements following the communication instruc-
tions.
Before equalization, the transmitter should be operated at the relevant pressure for ap-
prox. 5 ... 10 minutes long (warm-up time).
For correct zero point equalization, the pressure in the vacuum chamber must be below
1·10
-5
mbar.
With controller
DPG 101/DPG 109:
Equalize the transmitter as described in the instructions for the control units.
Via RS-232/RS-485: Evacuate the vacuum chamber to the pressure p < 1·10
-5
mbar.
Set the pressure adjusting point [P:741] to «000» for low pressure and transmit.
Send actual pressure value ([P:740] with value «000000» ) for low pressure (corre-
sponds to p < 1·10
-5
); ==> "ur" (under range).
Vent vacuum chamber to atmospheric pressure with air or N
2
; afterwards wait about
10 minutes.
Set the pressure adjusting point [P:741] to «001» for high pressure and transmit.
Set the actual pressure value to the atmospheric pressure («100023» for 1000 mbar).
? 0011074103000129
C
R
ASCII 48 48 49 49 48 55 52 49 48 51 48 48 48 49 50 57 13
0011074103000129
C
R
ASCII 48 48 49 49 48 55 52 49 48 51 48 48 48 49 50 57 13
Data type Description Size l1 - l0 Example
0 False / true 06 000000 / 111111
1 Positive integer number 06 000000 to 999999
2 Positive fixed comma number 06 001571 equal to 15.71
4 Symbol chain 06 TC_400
7 Positive integer number 03 000 to 999
10 Symbol chain 06 100023
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