VACUUBRAND MPT 200 - Manual (Page 16)

page 16 of 20
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 // 07/10/2011
The vacuum gauge head MPT 100 has been adjusted in the works. Depending on
the process and/or on accuracy requirements, check the adjustment and readjust
if necessary (e.g. in case of contamination, different orientation, extreme tempera-
tures, etc.). For readjustment, the device has to be adjusted both at atmospheric
pressure as well as 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 preheat.
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.
Ventilate the vacuum gauge head MPT 100 and/or the vacu-
um system with air or N
2
. Make sure that the sensor head at
the MPT 100 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 to a pressure be-
low 1*10 -5 mbar (e. g. by applying a high vacuum pump). Allow
the vacuum gauge head a period of minimum 10 minutes to
preheat 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 MPT 100
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 < 1*10 -5 mbar.
- the measured value of the Pirani sensor does not change for one minute and does deviate too much
from the most recent calibration value.