VACUUBRAND MPT 200 - Manual (Page 18)

page 18 of 22
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999226 // 05/05/2014
The vacuum gauge head MPT 100 / MPT 200 has been adjusted in the works. De-
pending on the process and/or on accuracy requirements, check the adjustment and
readjust if necessary (e.g. in case of contamination, different orientation, extreme
temperatures, etc.). For readjustment, the device has to be adjusted both at atmos-
pheric pressure and under vacuum.
➨ For readjustment, install the vacuum gauge head in the same orientation in which
it will be operated later on at the application.
➨ Allow the vacuum gauge head a period of minimum 5-10 minutes to stabilize.
If no adjustment is possible in the current pressure range, ”---- mbar” is displayed.
Adjustment at atmospheric pressure
An adjustment at atmospheric pressure is only possible in the
upper pressure range.
Vent the vacuum gauge head MPT 100 / MPT 200 and/or the
vacuum system with air or N
2
. Make sure that the gauge head
is at atmospheric pressure. Allow the vacuum gauge head a
period of minimum 10 minutes to stabilize at this pressure.
➨
In function ”Configuration” select the menu item ”Adjust-
ment” (see instructions for use of DCP 3000).
☞ The reading is automatically adjusted to ”1000 mbar”. This
value is fix and can not be changed.
➨ Press the selection knob to confirm.
Adjustment under vacuum
Manual adjustment:
Evacuate the vacuum gauge head MPT 100 / MPT 200 to a
pressure below 1*10 -5 mbar (e.g., by applying a high vacuum
pump). Allow the vacuum gauge head a period of minimum 10
minutes to stabilize at this pressure.
➨
In function ”Configuration” select the menu item ”Adjust-
ment” (see instructions for use of DCP 3000).
☞ The reading is automatically adjusted to ”zero”. This value
is fix and can not be changed.
➨ Press the selection knob to confirm.
1000 mbar
0 mbar
Readjustment of the vacuum gauge head
NOTICE
An automatic adjustment of the Pirani sensor is run automatically, when the following conditions apply
simultaneously:
- the pressure measured by the cold cathode is < 5*10 -5 mbar.
- the measured value of the Pirani sensor does not change for one minute and does also not deviate
too much from the most recent calibration value.