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PX838 Series bidirectional operation using
bipolar power supply (±12 Vdc) with bidirectional
output (0±5 Vdc or 0±2.5 Vdc)
SIGNAL0
Purging or de-gassing the sensor
Two 5 mm hexagonal socket bleed screws are located on the outer casing and can be
loosened to bleed the two pressure connections. Make sure that these screws are
tightened after this operation.
Note: It is possible to changeover the bleed screws and pressure connections enabling
easier access or for installation in a difficult position.
Adjustments
The following equipment is required to carry out the adjustments:
r Power supply
r Voltmeter or
r Milli-ammeter
r Pressure standard
u Connect the sensor as shown in Installation. The sensor should be put in its normal
operating position (vertical or horizontal). Remove the cover to gain access to the zero
and span adjustment potentiometers.
Zero adjustment
u Zero adjustment is carried out with no pressure applied.
u Depending on the model, set the zero adjustment to: 0.00 V, 2.50 V, 4.00 mA or 12.00 mA
Span adjustment
u Span adjustment is carried out with the required span pressure applied to the +
pressure connector.
u Depending on the model, set the span adjustment to: 5.00 V, 10.00 V or 20.00 mA.
u Release the pressure.
Completion
Check the output at zero pressure and if necessary, repeat the zero and span adjustments.
r Release the pressure and disconnect the equipment.
r Refit the cover.
Specification
Pressure range:..........................................................................................4 inH
2
O to ±150 psid
Pressure media:
X750 diaphragm Any fluids, compatible with stainless steel (316L),
X750 Inconel, 600 Inconel and viton.
Beryllium copper diaphragm Any fluids, compatible with stainless steel (316L),
beryllium copper, brass and soft solder and viton.
Accuracy:...............................................................................................................±0.25% FS BSL
(including linearity, hysteresis and repeatability)
Long term stability:.....................................±0.3% over 1 year at stabilized temperature
Weight
(approximate)
...........................................................................................................3.3 lbs
Dimensions.......................................................................................................................see below
Power supply
......................................................................................................................................10 to 30 V d.c.
PX838 (0 to 10 V output)........................................................................................16 to 30 V d.c.
PX838 (0 to ±5 V output)................................................................................................±12 V d.c.
Dimensions
Connect the power supply to + for positive,
- for negative, and 0 for neutral; connect the output
to signal for positive and 0 for negative signal.
0.68
0.26
High
Low
Pressure Ports:
3.11
Pg7 Cable
Gland
G1/8 Female via
welded adapter
Mounting:
2xM5 holes x 0.472 DP
on 2.66 centers
Purge Ports:
High Pressure
Low Pressure
2.80