Low range pressure measurement sensing devices.
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.
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.
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.
- Biogas HDPE cover PD blower pressure sensor
- 20 Pa DP range 0-10V output air pressure sensor for building management use
- Compound +/-200 mb g pressure transmitter with 1/2 BSPT
- Minus 0.25 inWG differential pressure transmitter for negative air pressure difference
- 10Pa diff range 0-20mA output air pressure sensor for automotive component testing
- Hygienic atex approved 100mbar pressure transmitter for pharmaceutical application
- Stainless steel 316L wetted parts 100 mbar ATEX pressure transmitter
- Industrial powder duct pressure transmitter with +/-15 kPa range
- 3 psig range 4-20mA output natural gas pressure sensor for building boiler heating use
- -2 to 2 inHg g 4-20mA out intake and exhaust air pressure sensor for building management use
- 2 mH2O hydrostatic range ratiometric 0.5-4.5 volts output pressure sensor
- 1 psig low range 4-20 mA output pressure sensor
- Negative 500 mmH2O g range 4-20mA output pressure sensor
- 400 mbar g range 0-10V output stainless steel pressure sensor
- 7mH2O g range 4-20mA out hydrostatic liquid level pressure sensor
- 500mbarg range 4-20mA signal stainless steel pressure sensor
- 100 mbar gauge range 0-5 volts output stainless steel pressure sensor
- -50 to +50 mbar g compound range 0-10 volts output pressure sensor
- -5 to +5 psi g low compound range 4 to 20 mA output OEM pressure sensor
- 800mbar absolute range 4-20mA output high temperature protected OEM pressure sensor
- 0 to -200 mbar negative gauge suction range 4-20mA output stainless steel pressure sensor
- -5 to +5 psig bidirectional low range 0-5 volts output pressure sensor
- -0.5 to +0.5 bar gauge 0-5 volts output compound range pressure sensor
- 0-50 mbarg 4-20 mA output natural gas monitoring pressure sensor
- Solvent compatible +/-100mWG dp transmitter with PTFE seals
- 3 wire 4 to 20mA pressure transmitter to measure 100 mbar
- Wet wet DP sensor for 10 inches of water range
- Argon gas pressure sensor for 0-20mbar above atmospheric pressure
- Minus 25 mb vacuum intrinsically safe 4-20mA pressure sensor
- Dust zone intrinsically safe 3000 Pa air pressure transmitter
- 50 mbar ATEX approved air duct pressure sensor
- Low delta P sensor with 200mmH2O range and response time < 5ms
- Trichloroethylene compatible 100 mbar Ex pressure transmitter
- Argon gas compatible pressure sensor for measuring up to 100 mbar
- -10 to +10 inH2O Air Pressure Sensor for Ventilation & Extraction
- DP transmitter for 10bar water line strainer cleaning indication
- Low range ATEX approved 100 Pascal range DP transmitter
- Biogas ATEX 4-20mA pressure transmitter for 0 to 20 mbar range
- Ethylene glycol antifreeze compatible 300 pascal dp sensor
- ATEX rated room ±100 Pa differential pressure transmitter
- Low vacuum leak detection 4-20mA current loop sensor & gauge
- Low operating temperature plus/minus 1 psi pressure transmitter
- 5 inH2O g range 4-20mA output air pressure sensor for air cleaning use
- 50mbarg range 4-20mA output petrol fill level pressure sensor for automotive testing use
- -20 to 20 inH2O g compound range 0-10Vdc output air pressure sensor for oem use
- 100mbar dp range 0-5Vdc amplified output air pressure sensor for aerospace research test rig use
- 3inH2O differential 4-20mA nitrogen pressure sensor and display for annealing furnace flow control use
- 5 psi dp 0-10V out air pressure sensor for automation flow rate testing use on a 15psi line
- 5psig 0-10V out freshwater pressure transducer and built-in display for water purifier use
- 20 inH2Og range 4-20mA output natural gas pressure transducer for commercial generator use
- 1 inH2O differential intrinsically safe 4-20mA out air pressure sensor for HVAC use
- 1 mbar range 4-20mA output biogas pressure transmitter for controlling blower fan connected to a covered lagoon
- 10 psig 4-20mA out submersible freshwater pressure sensor for underwater structure research
- -3 to 3 psi dp range high accuracy 4-20mA air pressure transmitter for water treatment use
- -3 to 4 mbar dp range 4-20mA ATEX approved biogas pressure sensor for process control use on a 1bar line
- Portable data acquisition trolley +/-20 kPa dp RS485 Modbus RTU interface air pressure sensor and display package
- Digital sensor for leakage monitoring at 1 kilopascal on a PC
- 20 inH2O low cost stainless steel pressure sensor with 5Vdc output
- 40 inH2O g OEM pressure transmitter with 4-20mA current output
- 20 inWG Liquid compatible pressure transmitter
- 80 mbar low range, 5 volt output pressure transducer
- G1/4 internal thread pressure transmitter for measuring 0-100mb
- 50 mbar gauge range 0-10 volts output pressure sensor
- 5 kPa g range 0-5 Vdc output fuel oil pressure sensor for liquid level measuring use
- Standby generator 20inH2Og range 0-5Vdc output natural gas and propane pressure sensor
- 3 psig range 4-20 mA output BMS natural gas or propane heater pressure sensor
- 25 inH2Og range 4-20mA output natural gas pressure sensor for use in generator supply
- 10psig 4-20mA oily wastewater pressure sensor with hi-temp protection for tank level gauging use
- Natural gas booster pump inlet/outlet pressure transmitters for backup power generators
- Bidirectional -50 to +50 Pa diff pressure transmitter with user calibration adjustment
- 1kPa diff pressure transducer for building air ventilation monitoring
- 1.5 inWG differential pressure transducer to control positive pressure inside a building
- Minus 100 pascal suction pressure transmitter
- 20 pascal differential pressure transducer for clean rooms
- 10 mmWC draft fan differential pressure transmitter
- 100 Pa bi-directional range differential air pressure transmitter
- Bi-directional -20 to +100 Pa clean room air diff pressure transmitter
- +/- 1 inH2O compound range pressure sensor
- Using 25 mbar DP sensor on vacuum below 0.2 bar absolute
- -0.1 to +0.1 inH2O g range 4-20mA signal air pressure sensor and display for pharmaceutical manufacturing use
- -200 to 200 Pa bi-directional range 4-20mA output dp pressure transmitter for venturi tube
- ATEX approved negative 10 mbar vacuum pressure transmitter
- 4 inch water column range 4-20mA differential pressure sensor for liquids
- 0.06 inWG positive air pressure transmitter for HVAC blower fan control
- 0-100Pa air pressure transducer with a 0-10V analog output
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).
Pressure sensors are measurement devices for detecting variations in pressure of liquids or gases. Typically a pressure sensor is made of two subcomponents, an electromechanical assembly on the frontend, and a signal conditioning module on the backend.
The frontend of the pressure sensor is connected directly via a thread or clamped seal to a pipe or vessel containing the liquid or gas to be measured. The pressure generated by the liquid or gas will apply a force to a sensitive exposed surface area within the electromechanical assembly which produces a physical change to the material, such as a deformation. This physical change is translated into an electrical change by smaller elements incorporated into the sensitive part of the assembly, typically on the reverse side of the surface in contact with the liquid or gas.
Since there are many different types of electromechanical technology used to measure pressure, producing very different electrical characteristics, it is necessary to add on a signal conditioning module to rationalise the electrical signal and convert it to one which is a commonly used standard within a particular industry or application.