Omega Products PX291-0.1WDI User Manual

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

⁄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

⁄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)

⁄16" Dia. tube

⁄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

130

(5.13)

121

(4.75)

108

(4.24)

(1.50)

3.8

(0.15)

37.6

(1.48)

(1.14)

(3.00)

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

ERO

PRESSURE

COM Vsup Vout

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.