300360490_002_C0 - 09/2016 - © Leybold
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4.2.2 Zero Adjustment DU2000 / DU2001 With Display Unit
The adjustment at zero pressure is an offset compensation of the measurement
signal.
For zero adjustment real pressure must be less than 0.1 mbar.
An adjustment at zero pressure is only possible, if the DI2000
pressure reading is below 100 mbar.
The DU2000 / DU2001 can be used in combination with display units of the
DISPLAY or CENTER series. After the adjustment the pressure reading at the
display unit at applied zero pressure should be 0 mbar.
For adjustment first remove the rubber caps from both buttons (1).
If the pressure reading is "0" in case of a DISPLAY unit or "ccc0", "cc0" or "c0" in
case of a CENTER unit, the output signal is too low. Then - by means of a screw
driver or other suitable tool - push the "up" button(2) to increase the output signal
until a pressure above zero is displayed.
Afterwards -or also if the displayed zero pressure is higher than "0"- push the
"down" button to decrease the pressure reading just to the point when "0" is
displayed.
If a button is permanently pressed the signal will change continuously in the
respective direction.
If no further button is pressed for an interval of 5s, the adjusted value is set.
Now insert the rubber cap again.
