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Low Pressure Transmitters

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.

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.