Programming - Instrutech CVM211 User Manual

Instruction Manual
4.3

Programming

1. With the CVM211 in the normal pressure display mode, press and hold <select> for 3 seconds.
2. The readout displays the value of the 'setpoint turn-on' pressure. The relay energizes when the pressure is
below this value [Factory default = 0.1 mbar].
3a. To keep this value and proceed to the next step, press <select>.
3b. To change the value, use the <up> <down> keys. Then press <select> to save and go to the next step.
4. The readout displays the value of the 'setpoint turn-off' pressure. The relay de-energizes when the pressure
is above this value [Factory default = 0.2 mbar].
5a. To keep this value and proceed to the next step, press <select>.
5b. To change the value, use the <up> <down> keys. Then press <select> to save and go to the next step.
6. The readout will display '000' to indicate the unit is in the "zero adjust" mode. To properly set "zero", with
the CVM211 installed on your vacuum system, the gauge should be evacuated to a pressure below
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1.33 x 10 mbar [Factory default = 000 mbar].
7a. If the gauge is not evacuated to a pressure below 1.33 x 10
step, without saving a new "zero" value.
7b. If the gauge is evacuated to a pressure below 1.33 x 10
and proceed to the next step.
8. The readout will display the current "span" value. To set the atmospheric pressure reading (also known as
the "span" adjustment), flow nitrogen gas or air into your closed vacuum chamber to allow the pressure to
rise to a known value above 530 mbar. Alternatively, if your local uncorrected barometric pressure (air) is
known, simply vent your vacuum system chamber to expose the gauge to the local atmospheric pressure.
[Factory default = 1.01 bar].
9a. If you do not have a known pressure in the gauge, press <select> briefly (less than 3 seconds) to exit the
setup menu and return to the normal pressure display without saving a new "span" value.
9b. If you do have a known pressure in the gauge, use the <up> <down> keys to change the displayed value to
agree with the known pressure. Press and hold <select> for 3 seconds until the displayed pressure switches
to the new value. This will save the new "span" setting and return to the normal pressure display.
It is good practice to perform the sequence of checking and adjusting span (ATM) then zero (VAC) and then,
finally re-checking the span setting to ensure that the circuitry is properly balanced for use in measuring
pressure throughout the intended measurement range.
InstruTech
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mbar, press <select> to proceed to the next
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mbar, press <down> to save the new user "zero"
CVM211 Stinger
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