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 differential pressure transmitters are precision instruments engineered to measure very slight differences in pressure between two points, typically for air and non-corrosive gases. These devices, often featuring 4-20mA outputs scaled over ranges of a few millibar, Pascals, or inches of water, are crucial for applications such as optimizing ventilation flow in HVAC systems, monitoring air filter conditions for predictive maintenance, and maintaining critical room pressurization in cleanrooms, hospitals, and laboratories, thereby ensuring operational efficiency, safety, and environmental control.
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. 
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.
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.
DMD341 Compact Differential Air Pressure Sensor - Small size dp sensor for measuring differential air pressure on HVAC, compress air and pneumatic control systems.
PrimAtü 10 Low Cost Low Range Differential Air Pressure Transducer - The PrimAtü 10 low cost low range differential air pressure transducer can detect and display both positive and negative differential pressure variations of very low low pressure ranges from 0.5 up to 1000 mbar/hPa, and output the pressure as a 4-20mA, 0-20mA or a 0-10Vdc analog output.
- 100 Pa bi-directional range differential air pressure transmitter
- Solvent compatible +/-100mWG dp transmitter with PTFE seals
- 4 inch water column range 4-20mA differential pressure sensor for liquids
- Measuring HVAC plenum and sub-floor air pressure in data centers
- Monitoring hot and cold aisle containment in datacenters using a differential pressure transmitter
- Bidirectional -50 to +50 Pa diff pressure transmitter with user calibration adjustment
Find out more about Low Differential Pressure Transmitters to determine which product options and capabilities will best meet your application requirements.
Low differential pressure transmitters are specialized instruments engineered for the precise measurement of minute pressure differences between two distinct points. This capability is crucial in applications where even slight variations in pressure can significantly impact operational efficiency, safety, or environmental control. These devices are designed with highly sensitive sensing elements capable of reliably detecting pressures often in the range of just a few millibars, Pascals, or inches of water column (inWC). The ability to accurately discern such small pressure gradients is fundamental in systems where subtle changes are indicative of important process conditions.
The 4 to 20 milliamp (4-20mA) current loop output is a standard feature, providing a robust and noise-immune signal transmittable over long distances, which is essential for integration with building management systems (BMS), programmable logic controllers (PLCs), or other industrial control systems. This analog signal is precisely scaled to the specific low-pressure range of the transmitter, ensuring that the full resolution of the output signal corresponds to the narrow pressure span being measured. This fine scaling is critical for achieving the necessary control accuracy in sensitive applications, such as modulating fan speeds in variable air volume (VAV) systems or maintaining precise room pressure cascades.
Many low differential pressure transmitters offer options such as integrated digital displays for local pressure indication, simplifying setup, calibration, and troubleshooting for instrument technicians. Alarm contact switches are another vital feature, providing configurable setpoints that can trigger alerts or automated actions when a pressure differential exceeds or falls below critical thresholds. For instance, these contacts can signal a clogged filter in an air handling unit (AHU), alert to a loss of pressurization in a hospital isolation room, or indicate insufficient airflow from a ventilation fan.
In HVAC systems, these transmitters are indispensable for monitoring and controlling airflow. By measuring the pressure drop across components like orifice plates, Pitot tubes, or even the fan itself within ductwork, airflow rates can be accurately determined and adjusted. This ensures optimal energy consumption and maintains desired indoor air quality. For air filter condition monitoring, the gradual increase in differential pressure across a filter bank provides a clear indication of particulate loading, enabling predictive maintenance schedules. This proactive approach avoids compromised air quality, reduced system efficiency due to overworked fans, and potential equipment damage.
Within cleanrooms, pharmaceutical manufacturing facilities, hospital operating theatres, and research laboratories, maintaining specific room pressurization is paramount. Low differential pressure transmitters are key to managing these critical environments, ensuring positive pressure to prevent the ingress of contaminants into sterile zones, or negative pressure to contain hazardous substances within areas like bio-safety level (BSL) laboratories or infectious disease isolation wards. Other applications include monitoring fume hood face velocity to ensure operator safety, detecting minute leaks in duct systems, and controlling draught in specialized industrial processes or environmental test chambers. The primary media for these instruments are typically air and other non-corrosive gases, aligning with their common deployment in controlled indoor environments and ventilation systems where aggressive media are not present.