MKS PR 4000 F, Instruction Manual

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PR4000F Chapter 4: Operation
35
During the autozero cycle the display shows ACTIVE followed by a short
report DONE if the procedure was completed successfully.
If the zero offset signal of the meter exceeds
±
250 mV the PR4000F will
not perform the autozero process and display FAIL . If this is the case you
should carefully check if all requirements for a correct zeroing are fullfilled
and, if necessary, do a coarse zero adjustment at the meter or transducer.
The zero offset value is displayed in the setup menu in the window OFFS .
When zeroing the type 120 the zero offset values in both ranges are
determined and compensated (provided that the range turndown function is
activated). For more information refer to section
Operation with Baratron
Type 120 later in this chapter.
VLV1, VLV2 Applies only to MFC’s and pressure controllers. VLV1, VLV2 are so called
valve switches, that means that a setpoint voltage will only be applied to a
pre-selected channel. Mark the respective channel with the left/right arrow
keys until the cursor appears at the right side of
VLVX. Then use either the
up or the down key to generate a diamond sign and confirm with the
ENTER key.
Any channel marked with a diamond can be switched on with the ON key.
This allows to switch on or off channels individually or all channels
simultaneously.
R1, R2 In this menu you can switch on or off the indicated relay, e.g. for test
purposes.
Diamond sign activated: relay is activated (switched on)
Diamond sign not activated: relay is de-activated (switched off)
Note
The setpoint voltage will be applied only to channels which have been
pre-selected with the valve switch
VLV1 or VLV2.
4.5 Operation with pressure transducers
If just pressure transducers Baratron series are used it is recommended to simplify the setup
settings by using the default configuration for pressure
DEFAULT P : All pressure readouts are set
to mbar, all analog inputs and outputs are set to 10 V. See the table in appendix C for all default
settings. Make sure anyway that the data of your pressure transducer confirm with the defaults,
otherwise change the setup settings where needed.
With setup settings completed and zeroing done, in most cases no more is necessary to be done.
You can immediately start measuring pressure using display 1, configurated for PR1 and PR2.