Absolute Mode - Presys PCON-Y17 Series Technical Manual

PRESYS
 Instruments
When the VENT mode is started, first the calibrator reads the pressure in the
control module. If the pressure measurement is below the Vent Opening Limit value,
the control is shut off and the VENT valve opens. Otherwise, if the pressure is above this
limit, the controller reduces the pressure down to the Vent Opening Limit value by
varying it according to the Vent Rate parameter. When the pressure reaches this limit,
the control is shut off and the VENT valve is opened.
The VENT valve remains opened until another Operation Mode (Control or
Measure) is started. To select another operation mode, press the VENT button again.

2.1.5. Absolute Mode

PCON-Y17 has an optional barometric reference (optional BR, see section 1.4
Order Code). When this option is chosen, PCON-Y17 can emulate absolute pressure by
using a built-in barometer at the REF (reference) port.
WARNING!
Do not apply pressure above 15 psia to the REF (reference) port.
To change the indication to absolute mode, press the SETTINGS button shown
below and select the ABS option.
Fig. 31 - VENT Configuration
PCON-Y17
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