Low Pressure Transmitters for Ranges less than 1bar g/diff/abs with 4-20mA Output

Low pressure transmitters for measuring gauge, differential, and absolute pressures below 1 bar (15 psi). Ideal for cleanrooms, HVAC, and air contamination control with 4-20mA output.

Low pressure transmitters are essential instruments engineered for the precise measurement of gauge, differential, and absolute pressures significantly below 1 bar (15 psi, 400 inWG, or 1000 mbar), typically providing a standard 4 to 20 milliamp current output for integration into control and monitoring systems. These devices are particularly critical in applications such as maintaining sterile environments in clean rooms and laboratories by monitoring minute pressure differences to prevent air contamination, as well as optimizing air ventilation and filtration systems in commercial and industrial buildings. Their ability to detect subtle pressure variations makes them indispensable for design engineers, process engineers, and instrument technicians in ensuring safety, efficiency, and quality across a range of specialized applications.

DPS200 HVAC Differential Pressure Transmitter - Differential air pressure sensor with a 10 volt or a 4-20mA output for building ventilation applications. Ranges from 0 to 6 mbar up to 0 to 1000 mbar.
DPS Low Differential Pressure Transmitter - Ultra low differential pressure transmitter for HVAC applications with 4-20mA current loop or amplified voltage output signal in pressure ranges from 0.1 mb up to 1 bar differential.
DMP331P Hygienic Flush Pressure Transmitter - Sanitary pressure sensor wth exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute
DMP331 Precision Pressure Transmitter - Stainless steel pressure transmitter with ranges from 100mbar up to 40 bar gauge or absolute. Special options for ATEX , SIL2 and compound ranges.
DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor - The DPS 300 is a low range HVAC differential pressure sensor. The lowest possible pressure range is 0...100 pascals. 2 or 3 switchable pressure ranges, plus volts or current output are included with most standard configurations.
41X High Precision Low Range Pressure Transmitter - High precision pressure transmitter for measuring very low vented gauge reference or differential air pressures. Rangeable 4-20mA or 0-10 volt output.
DMP343 Low Range Pneumatic Pressure Sensor - DMP343 pneumatic pressure sensor for measuring very low range pressures on pneumatic control systems, heating, ventilation and air conditioning systems (HVAC) .
DS210 Combined Low Pressure Switch, Indicator and Sensor - Low range three in one pressure switch, pressure indicator and pressure sensor for use on pneumatics and HVAC applications.
IMPLR Low Range All Stainless Steel OEM Pressure Sensor - Low cost sensor for measuring small pressure ranges from 0-50 mbar (10 inH2O) to 0-1000 mbar (15 psi) of liquids or gases.
DMD341 Compact Differential Air Pressure Sensor - Small size dp sensor for measuring differential air pressure on HVAC, compress air and pneumatic control systems.
DMK351 Liquid and Gas Resistant Intrinsically Safe Low Range Gauge Pressure Sensor - Intrinsically safe liquid & gas resistant low range pressure gauge reference pressure sensor for CHP, biogas and landfill sites.
DMK 458 Seawater Low Range Pressure Transmitter - Sea water corrosion resistant low range pressure transmitter for marine, ship and offshore engineering.

Low Differential Pressure Transmitters - Select highly sensitive low DP transmitters designed for critical applications like ventilation control, hospital isolation rooms, and laboratory environments. Features include 4-20mA signals, displays, and alarm contacts.
Low Pressure Range Intrinsically Safe Pressure Transmitters - These intrinsically safe pressure transmitters are designed for precise measurement in hazardous areas where low pressure ranges are critical.

Find out more about Low Pressure Transmitters to determine which product options and capabilities will best meet your application requirements.

Low pressure transmitters featuring a robust 4 to 20 milliamp current output are specifically engineered for precise measurement of low-level gauge, differential, and absolute pressures, typically below 1 bar (equivalent to 15 psi, 400 inches of water gauge, or 1000 millibar). These instruments are crucial in applications where even slight pressure variations can have significant impacts on operational integrity, safety, or product quality. The 4-20mA signal is an industry standard, favoured by design and process engineers for its noise immunity over long transmission distances and straightforward integration with PLCs, SCADA systems, and dedicated building management systems (BMS).

The ability to accurately measure minute differential pressures is a hallmark of these transmitters. This capability is paramount in environments like clean rooms, pharmaceutical manufacturing suites, and research laboratories. In such settings, maintaining specific pressure differentials between adjacent areas is critical to prevent airborne cross-contamination. For instance, a slightly higher pressure in a clean zone ensures that air flows outwards, barring the ingress of particulates from less clean areas. Conversely, containment suites for handling hazardous materials rely on negative pressure to ensure no contaminants escape. These transmitters provide the continuous monitoring necessary to validate these critical environmental controls.

In the realm of building services and HVAC (Heating, Ventilation, and Air Conditioning) systems, low pressure transmitters play a vital role in optimizing energy efficiency and maintaining occupant comfort. They are commonly deployed to monitor air ventilation pressures within ductwork, ascertain the status of air filters by measuring the pressure drop across them (an increasing differential pressure often indicates a clogged filter requiring replacement), and control Variable Air Volume (VAV) systems. Accurate measurement of duct static pressure, for example, allows the BMS to modulate fan speeds, reducing energy consumption while ensuring adequate airflow to all zones.

For applications requiring absolute pressure references at low levels, such as certain vacuum processes or specialized research environments where atmospheric pressure compensation is key, specialized low absolute pressure transmitters are utilized. Gauge pressure variants are frequently used to measure pressures relative to the ambient atmospheric pressure, such as the positive or negative air pressure within a ventilation chamber or the slight pressures found in gas flow systems. The selection between gauge, differential, or absolute types is dictated by the specific requirements of the installation, whether it’s for monitoring system performance, ensuring safety protocols in places like isolation rooms, or controlling delicate industrial processes like furnace draft or low-pressure pneumatic conveying systems. Instrument technicians and calibration technicians value the reliability of the 4-20mA output for consistent readings and ease of calibration in these sensitive applications.

The precise and stable measurement offered by these low pressure transmitters is indispensable for design engineers specifying control systems for critical environments and for process engineers aiming to maintain optimal conditions in sensitive manufacturing operations or research setups. Their utility extends to diverse installations, from biotech facilities and semiconductor fabrication plants to hospital operating theatres and specialized industrial machinery where controlling minute air or gas pressures is fundamental to the process or safety.