Readjustment of the vacuum gauge head, Notice – VACUUBRAND MPT 200 User Manual

Page 18

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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.

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