LEYBOLD THERMOVAC TTR 101 N, Operating Manual, Page: 26 / 42

26 300544655_002_C1 - 11/2016 - © Leybold
Piezo-sensor zero adjustments
The Piezo zero is automatically zero adjusted when the MEMS Pirani sensor measurement is below 6.2×10
-2
mbar
and consequently under normal operation
it’s not necessary to perform user adjustments. The Piezo zero
adjustment can only be executed when the MEMS Pirani pressure measurement is below 1.3×10
-1
mbar.
The Piezo zero adjustment sets the Piezo zero reading.
The Piezo atmospheric adjustment allows the user to adjust the atmospheric reading for the Piezo measurement
(only possible by using the serial interface).
The Piezo full scale adjustment allows the user to adjust the Piezo full scale reading. Vent the transmitter to
atmospheric pressure using the gas that corresponds to the gas calibration setup. Full scale adjustment can only
be executed with air or Nitrogen (only possible by using the serial interface).

By using Serial interface
For transmitter versions with a digital communication interface (P/N: 230366V02 (RS232) and P/N:
230702V02 (EtherCAT)) it is possible to make zero adjustments and full scale adjustments using the digital
communication interface. Refer to Communication Protocol 300544663 (RS232) and 300544664
(EtherCAT) for further details.
Before performing the atmospheric adjustment with the user switch, vent transmitter to Nitrogen or
air pressure of 1000 mbar. The transmitter will only accept full-scale adjustment when the pressure
readout is within 600 to 1000 mbar. Note that if the adjustment is performed at a true pressure
different from 1000 mbar, it can cause measurement deviations in the upper part of the measuring
range.
Caution
!
!