Cleanroom Equipment Spare Parts

Differential Pressure Sensor

A compact electronic transmitter that compares two low-pressure air connections and sends the resulting differential-pressure signal to compatible cleanroom or HVAC controls.

Two Independent Pressure Connections
Ceramic Low-Pressure Sensing Cell
Configurable Analog Signal
Sealed Non-Display Enclosure

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Product Introduction

This differential pressure sensor uses one temperature-compensated ceramic sensing element to compare the air pressure applied to two separate hose ports. The compact non-display enclosure keeps the measurement electronics behind a gasketed service cover, while one green indicator reports basic operating status without turning the device into a local digital gauge. A bottom compression gland routes the supply and output conductors to a four-position screw terminal, and a four-switch selector bank supports the configured range or response setting. Four reinforced mounting holes secure the transmitter to a wall, duct panel or control backplate. The connected tubing, measurement span, supply voltage and output signal are chosen together for room-pressure, airflow or filter-loading duty.

Key Features

Two physically separate hose barbs maintain distinct high- and low-side pressure paths, reducing the chance of confusing a differential measurement with a single static-pressure input.

A compact ceramic sensing element supports low-pressure air measurement without the mechanical pointer, movement and viewing window of an analog gauge.

The sealed polymer housing provides one controlled cable entry and a removable front cover for terminal access while keeping the normal installed face simple and easy to wipe.

Selectable span and response settings allow one enclosure format to serve room pressurization, filter condition or duct airflow monitoring when paired with the correct output configuration.

Customer Product Concerns

Low differential-pressure measurements are sensitive to tubing errors, unsuitable range selection and mounting conditions, so the complete pressure path and electrical signal must be checked as one measurement loop.

Reversing the two pressure tubes makes the measured direction incorrect and can cause a control system to interpret a positive room pressure as negative.The high and low connections are identified by fixed color rings, and both tube routes are traced from the room or duct pickup points before energizing the loop.

A span that is much wider than the expected pressure difference reduces useful resolution around the operating setpoint.The configured pressure range is chosen close to the normal and alarm limits while retaining enough margin for startup and filter-loading excursions.

Kinked, leaking or moisture-filled tubing can create slow response, offset or apparently stable but false readings.Both hoses use equal, supported runs with airtight joints, open pickup tips and suitable routing that prevents sharp bends and trapped condensate.

Incorrect supply or output wiring can produce a valid-looking signal that is scaled differently from the receiving controller.Supply voltage, 4-20 mA or 0-10 V output type, terminal assignment and controller scaling are verified together before the value is used for alarms or control.

Typical Applications

Cleanroom room-to-corridor pressure monitoringAir-handler filter differential-pressure sensingDuct static-pressure and airflow controlLaboratory and pharmaceutical ventilation systems

Technical Parameters

The following conservative ranges describe compact electronic transmitters for low differential pressure in air and non-aggressive gases; the final span, output and tubing connection are configured for the measurement duty.

Core Material	Light-gray PC/ABS enclosure with ceramic differential-pressure sensing element, protected FR-4 circuit board and polymer hose connections
Panel Thickness	1.5-3.0 mm nominal molded enclosure-wall thickness
Effective Width	100-130 mm nominal transmitter-body width excluding pressure ports
Maximum Length	Up to 175 mm overall length including the bottom cable gland
Steel Facing Thickness	0 mm steel facing; the exposed enclosure is engineered polymer
Core Density	Approximately 1140-1190 kg/m³ for representative PC/ABS enclosure grades
Thermal Conductivity	Approximately 0.18-0.24 W/(m·K) for representative PC/ABS enclosure materials
Surface Finish	Fine-textured wipeable light-gray housing, blue and red pressure-port rings, one green status lens and one matte-black cable gland
Joint Type	Four-hole fixed mounting with gasketed service cover, two independent hose-barb pressure inputs, one compression cable gland and one four-position screw terminal
Customization	Available based on the intended application and operating environment.

Available Options

4-20 mA two-wire output0-10 V three-wire outputMultiple low-pressure measurement spansSelectable instantaneous or damped response

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