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HVAC STYLE LOW DIFFERENTIAL
PRESSURE TRANSMITTERS
ZERO OFFSET
PX291 Series
0-0.1 inH2O to 0-30 psid
0-25 Pa to 0-2 bar
Starts at
$
196
Standard
⻬ Voltage or Current
Outputs
⻬ Low Power Consumption
⻬ No Moving Parts to Wear
⻬ Position Insensitive
⻬ Reliable Long-Term
Stability
⻬ Rugged Flame-
Retardant Case
Applications
⻬ Drop Across Filters
⻬ Static Fan Pressures
⻬ Clean Room Pressures
⻬ Variable Volume
Air Systems
⻬ Velocity Pressures
The PX291 Series of differential
pressure transmitters is designed to
measure low pressures while using
little power. A selection of ranges is
available to meet most industrial
and laboratory applications.
The transmitters are housed in a
flame-retardant, glass-reinforced
polyphenylene oxide case. Electrical
connections are made by means of
3
a
⁄8" terminal with #6 screws. There
are no moving parts and the
transducers are virtually position
insensitive. The span and zero
settings are made via 20-turn
potentiometers, for easy and
precise adjustments. The pressure
sensing element is a differential
capacitive cell for the low pressure
ranges from 0.1 to 5 inH2O and a
PX291-001WDI, $227,
shown actual size.
piezoresistive chip for ranges above
5 inH2O. Both sensors ensure
reliability and long-term stability.
SPECIFICATIONS
General: Measures differential, gage
pressure or vacuum
Excitation: 11 to 32 Vdc reverse
polarity protected
Voltage Output Models:
0 to 5 Vdc 3-wire, source or sink
3.5 mA, short circuit protected,
current draw = 10 mA
Current Output Models:
4 to 20 mA, output limited to
approximately 3.85 mA at low end and
25 mA at high end
Maximum Current Loop Resistance:
RL= (Vs- 11) x 50
Accuracy: ±1% includes linearity,
hysteresis
Calibration: NIST-traceable
Operating Temperature:
0 to 45°C (32 to 115°F)
Temperature Effects:
Zero: ±0.05%/°C
Span: ±0.02%/°C
Operating Humidity Range:
10 to 90% non-condensing
Shock Resistance: 10 g (11 ms)
Vibration Resistance: 5 g to 50 Hz
Overpressure: See order chart for
maximum safe momentary overpressure
Media Compatibility: Suitable for air or
inert gas
B-228
Pressure Connection:
connections with integral filters at both
ports, suitable for 1⁄8" ID Tygon®or
polyurethane tubing (3 to 4 mm) or
1
⁄4" OD polyethlene tubing (6 mm)
Electrical Connection: External
terminal strip with #6 screws
Case Material: Flame-retardant,
glass-reinforced polyphenylene oxide
Dimensions: 36 H x 76 W x 131 mm L
(1.4 x 3.0 x 5.15"); see next page
Weight: 190 g (6.72 oz)
3
⁄16" Dia. tube
3
⁄8"
OFFSET OPTIONS
If the measured differential pressure
is expected to go from positive to
negative, a transducer with offset
(elevated zero) should be ordered.
The standard models in the order
chart have no offset (i.e., at zero
differential pressure, the output is
0 Vdc or 4 mA).
2 offset options are available:
“A” 1⁄4 Span Offset
At zero differential pressure,
the output is 1.25 Vdc or 8 mA
allowable pressure excursion:
-33% to 100% of range
“B” 1⁄2 Span Offset
At zero differential pressure,
the output is 2.5 Vdc or 12 mA
allowable pressure excursion:
-100% to 100% of range
Examples: PX291-001WD5V-A
will have a range of 1" water at
5 Vdc and –0.33" water at 0 Vdc
PX291-001WDI-B will have a
range of +1" water at 20 mA
and -1" water at 4 mA
PRESSURE TRANSDUCERS
DIFFERENTIAL
B
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130
(5.13)
121
(4.75)
108
(4.24)
3
8
(1.50)
3.8
(0.15)
37.6
(1.48)
29
(1.14)
76
(3.00)
S
PAN
4.8 (0.19) DIA.
2 HOLES
9.53 (0.375)
TERMINAL STRIP
WITH #6 SCREWS
4.75 (0.1875) O. D.
PRESSURE FITTINGS
Z
ERO
LO
PRESSURE
COM Vsup Vout
HI
HVAC STYLE LOW
DIFFERENTIAL
PRESSURE
TRANSMITTERS
Dimensions: mm (in)
To Order (Specify Model Number)
0 to 0.1 inH2O 0 to 25.0 Pa PX291-0.1WD5V $252 PX291-0.1WDI $242 5 inH2O 1.25 kPa
0 to 0.2 inH2O 0 to 50.0 Pa PX291-0.2WD5V 227 PX291-0.2WDI 227 5 inH2O 1.25 kPa
0 to 0.3 inH2O 0 to 75.0 Pa PX291-0.3WD5V 227 PX291-0.3WDI 227 5 inH2O 1.25 kPa
0 to 0.5 inH2O 0 to 125.0 Pa PX291-0.5WD5V 227 PX291-0.5WDI 227 5 inH2O 1.25 kPa
0 to 1.0 inH2O 0 to 249.0 Pa PX291-001WD5V 227 PX291-001WDI 227 20 inH2O 4.98 kPa
0 to 2.0 inH2O 0 to 498.0 Pa PX291-002WD5V 196 PX291-002WDI 196 20 inH2O 4.98 kPa
0 to 3.0 inH2O 0 to 748.0 Pa PX291-003WD5V 196 PX291-003WDI 196 20 inH2O 4.98 kPa
0 to 5.0 inH2O 0 to 1.25 kPa PX291-005WD5V 196 PX291-005WDI 196 5 psid 0.34 bar
0 to 10.0 inH2O 0 to 2.49 kPa PX291-010WD5V 196 PX291-010WDI 196 5 psid 0.34 bar
0 to 20.0 inH2O 0 to 4.98 kPa PX291-020WD5V 196 PX291-020WDI 196 5 psid 0.34 bar
0 to 30.0 inH2O 0 to 7.47 kPa PX291-030WD5V 196 PX291-030WDI 196 5 psid 0.34 bar
0 to 50.0 inH2O 0 to 12.5 kPa PX291-050WD5V 196 PX291-050WDI 196 15 psid 1.0 bar
0 to 100.0 inH2O 0 to 24.9 kPa PX291-100WD5V 196 PX291-100WDI 196 15 psid 1.0 bar
0 to 1.0 psid 0 to 0.07 bar PX291-001D5V 196 PX291-001DI 196 15 psid 1.0 bar
0 to 2.0 psid 0 to 0.14 bar PX291-002D5V 196 PX291-002DI 196 15 psid 1.0 bar
0 to 5.0 psid 0 to 0.34 bar PX291-005D5V 196 PX291-005DI 196 15 psid 1.0 bar
0 to 15.0 psid 0 to 1.0 bar PX291-015D5V 196 PX291-015DI 196 30 psid 2.1 bar
0 to 30.0 psid 0 to 2.1 bar PX291-030D5V 196 PX291-030DI 196 60 psid 4.1 bar
Comes complete with NIST traceable calibration certificate and operator’s manual.
Maximum momentary overpressure.
*
Note: See specifications for description of the elevated zero option, $20 additional.
Ordering Examples: PX291-001WD5V, range of 1.00 inH2O at 5 Vdc and 0 differential pressure at 0 Vdc, $227.
PX291-001WD5V-A, range of 1.00 inH2O at 5 Vdc and -0.33 inH2O at 0 Vdc, $196 + 20 = $216.
PX291-001WDI, range of 1.00 inH2O at 20 mA and 0 differential pressure at 4 mA, $227.
PX291-001WDI-A, range of 1.00 inH2O at 20 mA and -0.33 inH2O at 4 mA, $227 + 20 = $247.
DPi8 with ethernet, $240, shown smaller
than actual size. iSeries meters and
controllers accept both 0 to 5V and
4 to 20 mA transducer signals, see page
D-13 for details.
MOST POPULAR MODELS HIGHLIGHTED!
RANGE OUTPUT PRICE OUTPUT PRICE OVERPRESSURE COMPATIBLE METERS**
5 Vdc 4 TO 20 mA MAX*
**
See section D for compatible meters.
B-229
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
DP41-E, DP25B-E, DP24-E
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