WIKA Pascal 100 - Manual (Page 23)

6 Commissioning, operation
WIKA Operating Instruction, Model Pascal 100 and Pascal 100/IS 23
GB
6.2 Pressure
6.2.1 Pneumatic circuit
Pascal 100 or Pascal 100/IS can be equipped with four internal and two external pressure sensors.
The internal sensors work only with clean dry gas (like dry air) whereas the external sensors can
work with gas or liquid. Gas is related to pneumatic circuit and liquid to hydraulic circuits.
Pascal 100 or Pascal 100/IS has a pneumatic circuit that gives possibility to execute a large
number of calibration in an easy way for connecting the device under test. An integrated pump and
a fine adjustment allow to generate the required pressure. The generated pressure, according to
the model, can be distributed in parallel to all sensors. The sensors whose ranges are much lower
than the maximum pressure generated in the pneumatic circuit are protected from overpressure by
a mechanical valve that closes the circuit when the pressure gets over its range.
Switching the pressure-vacuum selector in the vacuum position is possible to generate vacuum
(pressure under the barometric)
For example, if we want to measure a signal from pneumatic instrument 3 - 15 PSI or to measure
high gas pressure over 21 bar and we use an internal sensor directly connected to the process, we
must pay attention not to damage it by applying pressure over its range.
Figure 9 – Direct transducer
Direct transducer