W Series Pressure Transmitter

Series W pressure transmitters

The Series W pressure transmitters are designed to measure low differential pressures of liquids or gases. A wide selection of standard pressure ranges and electrical ratings is available. These transmitters feature: no moving parts to wear out, proven long term stability of piezoresistive devices, only 316 stainless steel in contact with the fluid, and all welded construction.

Series W transmitters are an excellent choice for many HVAC, process and automation monitoring requirements. Typical applications include measurement of differential pressure across flow elements, heat exchangers, pumps, filters, liquid level monitoring and other demanding differential pressure measurement and control applications.

The transmitters are housed in a compact heavy duty gasketted cast aluminum enclosure designed to IP 65 of IEC 529 standards and NEMA 4. The die cast aluminum enclosure incorporates a recessed neoprene gasket to prevent ingress of moisture or dust. Wall mounting holes are enclosed in the cast aluminum box and concealed by the cover. The wall mounting holes and the cover attaching screws are outside the gasketted area. Access to the electrical terminals are made through knockouts on the front of the box. A choice of one or two knockouts and three hole sizes is available to accommodate usage of 1/2" conduit or metric sizes PG11 and PG13. Pluggable terminal block connectors are provided with wire protection and captive terminal screws.

The Series W includes four models: Model W10, Model W20, Model W30 and Model W40. These four models incorporate a variety of power and signal options. The span or zero adjustment is performed with a 20-turn potentiometer for fine resolution. A 50% adjustment in output is possible.

The Series W transmitters have been tested by an accredited laboratory and comply with the European requirements of Council Directive 89/336/EEC for emission measurements per EN50081-1 and immunity tests per EN50082-1.

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W-Series Features

  • ± 0.5% Accuracy, Full-Span
  • Rugged NEMA 4/IP 65 Rated Aluminum Enclosure
  • Stability-Proven Piezoresistive Sensor
  • 0-5V, 0-10V and 4-20 mA Outputs
  • DC & 24, 120, 240 VAC Power Inputs
  • Reverse Polarity Protected
  • NIST Traceable Calibration
  • CE Approved
  • HVAC Process and Automation
  • Liquid Differential Pressure Measurement
  • Liquid Level Monitoring


Accuracy ±1/2% of differential pressure range (includes non-linearity and hysteresis) or ±1% for 6 psid (50 kPA) range
Effect of Static Pressure on Differential Pressure Measurement Less than ±0.25% for static pressure change from 0 to 100% or ±0.5% for 6 psid (50 kPa) range
Calibration Traceable to National Institute of Standards and Technology (NIST)


Process wetted surfaces are 316 stainless steel.
Operating Temperature Range 32°F to 122°F (0°C to 50°C)
Storage Temperature -20°F to 160°F (-30°C to 70°C)
Effect of Temperature
  • On zero: ±0.05%/°C or ±0.1%/°C for 6 psid (50 kPa) range
  • On span: ±0.03%/°C or ±0.06%/°C for 6 psid (50 kPa) range
Operating Humidity Range 10% to 90% RH, non-condensing
Shock Resistance 10 G (11 ms)
Vibration Resistance 5 G 3 to 50 Hz

Electrical Connectors

Polarized Euro plug/connectors.
Connector rating 10 Amps/300 V
Material Glass-filled polyester


Dimensions 3.56 in x 4.54 in x 2.18 in (90 mm x 115 mm x 55 mm)
Enclosure material Aluminum Alloy #A380
Cover screws M4 stainless steel non-magnetic
Finish Black epoxy paint
  • Choice of 2 holes
  • Hole sizes are offered in a choice of 1/2 in (12.7 mm) conduit or metric sizes of PG11 or PG13.
  • Cable glands not included.
Pressure port connections 1/8-28 female NPT
Weight 1.2 lb (540 g)


Supply Voltage 11 to 32 VDC (See diagram for maximum loop resistance)
Output Two-wire/4 to 20 mA output
Protected against reversal of polarity. Output limited to approximately 3.85 mA at low end of span and approximately 25 mA at upper end of span.


Standard Pressure Ranges for Modus W Series

Series W Pressure RangesSeries W Pressure Transmitters Graph
Series W Pressure Transmitters DiagramSeries W Pressure Transmitters Pressure Chart

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Modus Series W Differential Pressure Transmitters Modus Series W Differential Pressure Transmitters Modus Series W Differential Pressure Transmitters