Low range pressure sensors, gauges, loggers and calibrators for measuring low pressures on filtration systems, ventilation fans, air conditioning & handling systems.
These instruments are used for measuring very low pressures in applications such as on building management systems to control the distribution of air throughout the building, for ensuring a small difference in air pressure between two adjoining labs to prevent contamination, or for monitoring the increase in pressure across a filter to indicate when the filter should be cleaned or replaced.
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.
DPC Low Range Pressure Controller and Calibrator - The DPC low range pressure controller calibrator measures and generates low range pressures over 1, 10, 100 or 1000 mbar, and can be used as a pressure measurement device or as a test and calibration device for pressure sensors and pressure switches.
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
DM01 Multi-Range High Accuracy Pressure Gauge - High precision digital pressure gauge with 0.1% full scale accuracy, exchangeable pressure range modules from 100 mbar (1.5 psi) up to 400 bar (6000 psi).
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.
IWPT Wireless Battery Powered Pressure Sensor and Receiver - Wireless battery powered pressure sensor and receiver system for connecting pressure sensors without wires to a central wireless receiver which converts each received pressure signal channel to a 1-5Vdc, 4-20mA output, USB, Ethernet TCP, RS232 RTU, RS485 RTU or 2G 3G 4G mobile cellular network.
- 100 mbar pressure logger for monitoring natural gas pressures
- Low operating temperature plus/minus 1 psi pressure transmitter
- Air classification system powder duct pressure transmitter with +/-15 kPa range and ATEX/IECEx IS cert
- ATEX approved negative 10 mbar vacuum pressure transmitter
- Biogas ATEX 4-20mA pressure transmitter for low pressure anaerobic digestion monitoring
- Clean room monitoring system to measure pressure, humidity & temperature in 4 individual rooms
- Low Range Pressure Sensors - Explore low range pressure sensors for measuring pressures in Pascals, mbar, or inches H2O. Learn about design challenges, accuracy, and applications like HVAC & cleanrooms.
Low Range USB Pressure Sensors - Low range USB pressure sensors are suitable for monitoring pressure in cleanrooms, HVAC systems, and filter monitoring, among other applications.
Low Pressure Data Loggers - Low pressure data loggers offer precise and reliable tracking of gauge or differential air pressures in critical environments such as ventilation systems and clean rooms.
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 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 Range Pressure Gauges - Source reliable digital low pressure gauges offering high resolution, multi-unit display, min/max capture, and zero function for critical low-pressure applications.
Find out more about Low Pressure Range to determine which product options and capabilities will best meet your application requirements.
Measuring low range pressures is typically necessary on systems that transport air or gases such as building ventilation and factory dust or fume extraction.
In order to move air or gas from one place to another, a differential pressure difference needs to be created which causes movement in the direction of higher to lower pressure. Only a relatively small difference in pressure is needed to create sufficient movement of air or gas, which is a good thing because too high a differential would cause problems with noise and opening of doors in a workplace environment.
The size of low pressure measuring devices tends to be larger than equivalent higher range ones, this is because lower pressures produce less deformation in the sensing material, and therefore a larger surface area is required to maintain sensitivity of measurement. A thinner material is also used, but this is often limited by the technology and strength of the active material.
Due to the larger surface area and thinner sensing material used in low pressure sensing devices, it is necessary to downgrade the accuracy performance compared to higher ranges, because they are more sensitive to external environmental influences such as vibration and temperature changes.
Pressure units which are used to describe low pressure ranges include pascals (Pa), millibars (mbar, mb), hectopascals (hPa) or inches of water column (inH2O, inWC, inWG, “H2O, “WC, “WG).
Application Help
Train tunnel low pressure change
We want to measure the change in pressure on a tunnel wall as a train passes through it, we expect the pressure change to be as high as 2.5 kPa. Would it be best use two absolute or one differential range pressure sensor to measure this?
Where possible always use a differential range pressure sensor to measure a pressure change that is much smaller than the baseline total pressure. If you use an absolute range pressure sensor it will have a range of ~120 kPa absolute and therefore the accuracy at the 2.5 kPa is going to be very poor, and thats before you have considered the additional error of subtracting the other static reference reading. If you use a differential pressure sensor with a low pressure range of 2.5 kPa you will measure the change directly and to a much higher accuracy.
Long pipework
Will long pipework affect low pressure readings?
Long small bore pipework will dampen pressure readings if the pressure is changing rapidly, so ideally you want to mount the sensor as close as possible and keep the pipework as short as possible, particular on connections which will have very dynamic pressures.
Trapped water in pipes
Will trapped water affect low air pressure readings?
Water trapped inside small diameter pipework used to measure a low air pressure will cause unexpected pressure changes due to the water head pressure and meniscus force effects. A slug of water in a vertical section of pipe will contribute a slight pressure on the trapped air inside the pipe. Also the surface tension generated by the air/water interface will contribute a force known as capillary action, which will cause a slight increase or decrease in pressure.
Related Help Guides
- Measuring the difference in air pressure between rooms
- What affects the performance of low pressure sensors
Related Product and Application Guides
Related Technical Terms
- g Effect
- HVAC
- inH2O – Inches of Water Column at 4 deg C Pressure Unit
- mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
- oz/in² – Ounce per Square Inch Pressure Unit
- Pa – Pascal Pressure Unit
Related Product Types
- Low Range Pressure Sensors
- Low Range USB Pressure Sensors
- Low Pressure Data Loggers
- Low Pressure Transmitters
Contact us about this Low Pressure Range page to request more information, or to discuss your application requirements.