Learn how a differential pressure sensor (dp sensor) can be used to measure a partial vacuum as a negative pressure relative to local surrounding air pressure.
Vacuum
Vacuum measurement product details and application guidance for measuring over a range of pressures below atmospheric pressure.
Measuring vacuum as an absolute range using a dp sensor
Find out how to use a differential pressure sensor (dp sensor) to measure a partial vacuum as a positive pressure relative to full vacuum.
Vacuum Digital Interface Pressure Sensors
Vacuum range digital interface pressure sensors for connecting to computer serial bus or other intelligent interface.
Electronic Vacuum Switches
Electronic switches for starting & stopping equipment or sending an alarm signal at a preset vacuum pressure.
Vacuum Range Calibration Equipment
Calibration pumps for generating vacuum pressures to check vacuum reading accuracy of sensors, gauges and switches with a master vacuum test gage.
Vacuum testing controller and datalogger for pressure/flow measurement and regulating vacuum
A controller and datalogger fitted with an input module to measure the 4-20mA output of the vacuum and flow transmitter, and an output module for controlling the vacuum regulator.
DCT531P RS485 Modbus RTU Flush Pressure Sensor
RS485 Modbus RTU serial interface pressure sensor with exposed all welded stainless steel 316L flush diaphragm in ranges from 100mb up to 40 bar gauge or absolute.
Can you have a minus 20 psi gauge vacuum measurement range
Is it possible to have a vacuum pressure measurement device with a -20 to +50 psi gauge pressure range, since I’ve never seen a pressure instrument with a range greater than -15 psi?
Output signal orientation for a negative gauge pressure range
Since a negative pressure range works backwards to a positive gauge or an absolute pressure range, and that zero pressure corresponds to a full scale measurement, it has led to the use of both a forward and reverse output signal to measure suction or vacuum pressure in relation to ambient atmospheric air pressure.
Measuring negative pressure using a positive differential pressure range
How can you use a differential pressure measurement device to measure a negative pressure if it has been factory configured to measure a positive pressure range without making any adjustments to the electronics or the signal output?
What does negative and positive gauge pressure mean
You may not be aware but nearly every pressure measurement device you are using has a positive or negative gauge reference.
Can you measure vacuum using a gauge pressure range
The most common type of pressure range for pressure measurement instrumentation is one which has a gauge reference. So if you want to measure vacuum pressure, it would be convenient to use a gauge pressure device which is the most widely available pressure range format.
What is the difference between vacuum and absolute pressure
Often you will see a measurement of vacuum pressure described as an absolute pressure reading, so is there any difference between the two?
Suction Pressure to Vacuum Calculator
This tool will calculate the absolute referenced vacuum pressure by subtracting the suction from the barometric pressure reading you entered and convert any combination of pressure units for each pressure value.
Vacuum to Suction Pressure Calculator
This tool will calculate the suction pressure by subtracting the vacuum pressure reading from the barometric pressure reading you entered and convert any combination of pressure units for each pressure value.
N/mm² to psi Conversion Table
Pick out the vacuum or atmosphere pressure value you require from 1 to 1,000 newtons per square millimetre to determine the converted value in lbs/sq in units.
N/m² to psi Conversion Table
Pick out the vacuum or atmosphere pressure value you require from 1 to 200,000 newtons per square metre to determine the converted value in lbs/sq in units.
psi to N/mm² Conversion Table
Pick out the high range pressure value you require from 100 to 100,000 lbs/sq in to determine the converted value in newtons per square millimetre units.
psi to N/m² Conversion Table
Pick out the vacuum or atmosphere pressure value you require from 0.01 to 20 lbs/sq in to determine the converted value in newtons per square metre units.
Torr to bar Conversion Table
Pinpoint the pressure in torr pressure units from 1 to 1,000 to determine the value in bar units.
mmHg to bar Conversion Table
Pinpoint the pressure in millimetres of mercury column pressure units from 1 to 1,000 to determine the value in bar units.
mbar to bar Conversion Table
Pinpoint the pressure in millibar pressure units from 1 to 2,000 to determine the value in bar.
hPa to bar Conversion Table
Pinpoint the pressure in hectopascal pressure units from 1 to 2,000 to determine the value in bar.
bar to Torr Conversion Table
Pinpoint the pressure in bar pressure units from 0.001 to 2 to determine the value in Torr pressure units.
bar to mmHg Conversion Table
Pinpoint the pressure in bar pressure units from 0.001 to 2 to determine the value in millimetres of mercury column.
bar to mbar Conversion Table
Pinpoint the pressure in bar pressure units from 0.001 to 2 to determine the value in millibars.
bar to hPa Conversion Table
Pinpoint the pressure in bar pressure units from 0.001 to 2 to determine the value in hectopascals.
mmHg to mmH2O Conversion Table
Choose a vacuum pressure in millimeters of mercury column from 0.1 to 1,000 mmHg to cross reference the converted pressure in millimeters of water column.
mmHg to inHg Conversion Table
Choose readings from 0 to 1000 millimetres of mercury column to convert them into inches of mercury column.
Minus 30 inHg 4-20mA air pressure sensor for measuring vacuum in a sealed tank heated to 350F
A hi-temp media 200°C/392°F max gauge pressure sensor for measuring vacuum in a sealed tank heated to 350 degrees F over a range of 0 to -30 inHg g from the G1/2 male process connection, and sending the corresponding 4-20mA signal through the field housing electrical connection.
Vacuum insulation 15 psi absolute range millivolt output pressure sensor for air extraction use
An absolute pressure sensor for vacuum insulation air extraction use to measure vacuum pressure of air over a range of 0 to 15 psi abs from the G1/4 male process connection, and sending the corresponding mV/V signal through the submersible cable electrical connection.
30 inHg low relative vacuum range digital display vacuum pressure gauge and logger
Digital display pressure gauge and logger for pipe mounted use in low relative vacuum measurement applications, capable of measuring 0 to -30 inches of mercury column g pressure with 0.1% accuracy and connected using a 1/4 NPT male fitting. Also includes USB interface, logging functionality and PC software.
-1 to +5 bar relative 4-20mA out low cost combined vacuum and pressure sensor
Low cost combined vacuum and pressure sensor for measuring over a -1 to +5 bar relative pressure range and generating a 4 to 20 milliamps output signal.
Vacuum Conversion Table
Look up a vacuum conversion value for percentage of vacuum (% vac), millibar (mbar, mb), hectopascal (hPa), pounds per square inch (psi), inches of mercury (inHg), millimetres of mercury (mmHg) or Torr absolute vacuum units.
-20 to +50 psig 0-10V out compound range liquid dispensing pressure sensor
Positive and negative range pressure sensor for measuring liquid dispensing pressure over a -20 to +50 pounds per square inch gauge pressure range and generating a 0 to 10 volts output signal.
-1 to 20 bar g compound range IS 4-20mA propane pressure sensor for process control use
An intrinsically safe compound range pressure sensor for process control use to measure pressure of propane gas over a range of -1 to 20 bar g from the G1/4 male process connection, and sending the corresponding 4-20mA signal through the DIN plug electrical connection.
15 psi absolute range RS485 Modbus RTU protocol interface vacuum sensor for research use
A vacuum range absolute pressure sensor for research use to measure pressure of air over a range of 0 to 15 psi abs from the 1/4 NPT male process connection, and sending the corresponding RS485 Modbus RTU signal through the M12x1 plug electrical connection.
0 to -200 mbar negative gauge suction range 4-20mA output stainless steel pressure sensor
Economical stainless steel diaphragm pressure sensor with semiconductor strain gauges for measuring over a 0 to -200 mbar negative gauge suction range and generating a 4 to 20 milliamps output signal.
1000 mbar absolute vacuum range 0-10Vdc output air pressure sensor for research use
A high accuracy absolute pressure sensor for research use to measure vacuum pressure of air over a range of 6 to 1,000 mbar abs from the G1/4 male process connection, and sending the corresponding 0-10Vdc signal through the DIN plug electrical connection.
2barg, 10barg range wireless pressure sensing kit for production monitoring use
Wireless pressure measurement kit for production monitoring use with a -1barg, 2barg, 10barg range plus a 1/4 BSP male fitting. Each pressure reading is transmitted wirelessly to a five channel base receiver, where it is converted to a 1-5Vdc or 4-20mA analogue output signal.
-1 to 6 bar differential RS485 Modbus RTU freshwater pressure sensor for farming use on a 6bar line
A compound range differential pressure sensor for farming use to measure pressure of freshwater over a range of -1 to 6 bar diff on a 6 bar freshwater line from two G1/4 male process connections, and sending the corresponding RS485 Modbus RTU signal through the M12 connector electrical connection.
20 kPa negative differential range air pressure gauge and sensor with tubing fitting
Digital display negative differential pressure gauge and sensor for use in vacuum air measurement applications, capable of measuring 0 to 20 kPa DP with 1% accuracy and connected using a 6.6 x 11 mm tube fitting.
50 kPa absolute vacuum air pressure gauge with 1/4 NPT male fitting
Absolute vacuum pressure gauge for portable use in air measurement applications, capable of measuring 0 to 50 kPa abs pressure with 1% accuracy and connected using a 1/4 NPT male fitting.
Bi-directional 15psig 4-20mA out air pressure sensor for research use
A bi-directional compound range pressure sensor for research use to measure vacuum and pressure of air over a range of -15 to 15 psi g from the G1/4 male process connection, and sending the corresponding 4-20mA signal through the DIN plug electrical connection.
Negative 250mbarg range 4-20mA out suction range pressure sensor
Economical stainless steel diaphragm suction range pressure sensor with semiconductor strain gauges for measuring over a 0 to -250 mbar gauge pressure range and generating a 4 to 20 milliamps output signal.
Depression vacuum 1 bar absolute range 0-5V output automotive test pressure sensor
Economical corrosion resistant ceramic diaphragm pressure sensor for measuring vacuum depression over a 1 bar absolute pressure range on an automotive test rig and generating a 0 to 5 volts output signal.
Negative 500 mmH2O g range 4-20mA output pressure sensor
Economical stainless steel diaphragm pressure sensor with semiconductor strain gauges for measuring vacuum over a negative 500 to 0 mmH2O gauge pressure range and generating a 4 to 20 milliamps output signal.
Leak testing set for checking 1mb/min drop at negative 10 mbar vacuum
We need a suitable gauge to use as a leak testing test set we are looking to build. We need to measure down to -10 mbar and monitor for 1 minute to ensure the leak rate is not greater than 1 mbar/minute.
Under and Over pressure monitoring -10…+200 mb pressure transmitter
Compound range pressure transmitter for monitoring under pressure down to -10 millibar gauge and an over pressure of up to 200 millibar, with an output scaled from 4 to 20 milliamps with 4mA = -10mbar, and 20mA = +200mbar.
Low vacuum leak detection 4-20mA current loop sensor & gauge
Detect low vacuum leaks with this combined 4 to 20 milliamp current output sensor and digital display gauge over a vacuum of 0 to minus 30 inches of water column.
15 psi absolute vacuum range 0-5 volts output pressure sensor
Vacuum range pressure sensor for measuring over a 0 to 15 psi absolute pressure range and generating a 0 to 5 volts output signal.
Vacuum suction sensor & wall mount digital readout with switched contacts
Vacuum suction sensor that can provide a digital readout and a switched contact when the pressure gets too high
400 mbar absolute (not relative) battery supplied vacuum sensing display
Battery supplied digital readout display for sensing the absolute pressure of a vacuum below 400 mbar.
Negative 30 inHg vacuum gauge with 0-10V output
Combined digital vacuum gauge and 0 to 10 volts analogue output for measuring from 0 to -30 inHg gauge pressure.
Vacuum sensor control system set-point tester for 0 to -0.95 bar/13.8 psi
Precision vacuum pump and gauge tester for verifying the vacuum set-points of sensors connected to a control system.
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.
Landfill biogas extraction well depressure pressure transmitter
Monitor the suction pressure at the top of a biogas vertical extraction well in a landfill site.
Vacuum pump inlet to outlet differential pressure sensor with 1500 Torr range
Differential pressure sensor to measure the differential pressure between the inlet and outlet of a vacuum pump.
Vacuum Pressure Transducers
These voltage output transducers will provide a linear signal of a few volts that is directly proportional to a specified vacuum range.
Vacuum, Suction, Negative Pressure Gauges
Vacuum range gauges for measuring absolute vacuum or suction pressures which can be permanently installed or used as a test gauge.
Vacuum, Suction Pressure Data Loggers, Recorders
Vacuum data loggers for recording negative suction pressure or absolute pressure below atmospheric pressure. Log and store vacuum measurements for printing test reports or analysing process trends.
Lobe pump suction intake vacuum transmitter
Vacuum pressure transmitter to measure the suction intake of a lobe pump.
Vacuum Pressure Transmitters
Choose vacuum pressure transmitters for measurements over the low vacuum range of 25 to 760 Torr, using a absolute or negative gauge reference vacuum range.
Vacuum digital gauge to measure 0 to 1000 mbar absolute
We have a need for a general vacuum digital gauge which can display 0-1000mbar vacuum as absolute readings.
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) .
LEO Record (Ei) Pressure Data Logger
LEO Record combined digital manometer & pressure data logging instrument for recording pressures & temperatures that can store up to 57,000 readings.
LEX1 (Ei) High Accuracy Digital Pressure Gauge
High precision digital pressure gauge with an accuracy of 0.05% full scale in pressure ranges from 0…30 mbar up to 0…1000 bar.
LEO 2 (Ei) Digital Manometer
LEO 2 battery powered digital manometer with pressure ranges from -1 to 3 bar up to 700 bar with an accuracy of 0.1% full scale with 6 pressure units, zero tare & peak hold display functions and optional ATEX approval for intrinsic safety.
Using 25 mbar DP sensor on vacuum below 0.2 bar absolute
I would like to measure a differential pressure of 0 to 25 mbar in a vacuum of < 0.2 bar absolute pressure.
Digital vacuum/pressure recorder to replace circular paper chart
The LEO Record will log both vacuum and positive pressure. The recorder software will converts recorded data file to .txt file to import into spreadsheet.
PGS40 Mid Pressure Calibration Hand Pump
PGS40 pneumatic hand pump for applying test and calibration pressures with precision from -0.96 up to 40 bar gauge.
High reading rate for measuring dynamic pressures to -200psf
DMP320 which has a high sampling rate of 10 kHz so you will easily resolve the dynamic change characteristic over 0 to -200 psf within the 8sec window.
300 mbar vacuum and pressure high accuracy gauge
LEX1 high accuracy digital pressure gauge with a +/-300 mbar gauge pressure range for measuring low gas/liquid pressures and vacuums to a high accuracy
Precision hand pump with 1/4 NPT test gauge mount for -0.9 to 40 bar
Precision pressure hand pump with a range of -0.9 bar to 40 bar for setting vacuum and gauge pressure measurements.
60 psi / 4 bar Low Pressure Calibration Pump – ADT912
Set precise calibration air pressures from 95% vacuum up to 4 bar / 60 psi.
40 mbar negative gauge vacuum transmitter for pump VSD control
DMP343 is a capable of measuring a 40 millibar negative pressure with a 4-20mA scaling over 0 to -40 mbar.
Vacuum and steamer pressure transducer with -30 inHg to 100 psi range
Pressure transducer with an output voltage of 1-5V, able to withstand up to 150 C on the pressure side
Compound vacuum and pressure HART transmitter for +/- 500 mmWG
Compound vacuum and pressure transmitter with HART compliant 4-20mA analog output and insertion type, bottom mounted, 1/2 NPT male process connection
Low range vacuum pressure logger for 0 to -60 inH2O g
I am interested in monitoring vacuum on a pipeline in the field with a portable data logger.
Vacuum drying pressure data logger
Digital vacuum recorder for a vacuum drying pilot process.
DS200 Combined Pressure Switch, Gauge and Sensor
Three in one electronic pressure switch, digital pressure gauge and pressure sensor with pressure ranges from 100 mbar up to 600 bar (1.5 to 9000 psi).
DMK331P Flush Diaphragm Pressure Sensor
Screw-in pressure transmitter with flush stainless steel 316L diaphragm for measuring pressures of fluids with very high viscosity from 900 up to 6000 psi
IMP Low Cost Pressure Sensor
Versatile low price pressure sensor with a wide selection of electrical and mechanical options for customisation.
LEO1 (Ei) Digital Pressure Gauge
Battery powered digital gauge with an accuracy of 0.1% full scale in pressure ranges from -1 to 3 bar up to 1000 bar.
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
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.
DMP331i High Accuracy Pressure Transmitter
High precision pressure transmitter with an accuracy of 0.1%FS BSL NLHR and digitally adjustable pressure ranges from 400mb up to 40 bar gauge & absolute.
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.
Negative Gauge Pressure
Negative Gauge Pressure is the difference in pressure between any vacuum and atmospheric pressure. The maximum possible negative gauge pressure is always limited by the current ambient atmospheric pressure, which constantly varies, but is typically around 1 bar absolute.
Suction Pressure
Suction pressure is a negative difference in pressure generated between two points which draws a gas or a liquid from a higher to a lower pressure state.
Vacuum
This guide provides an overview of measuring vacuum pressure including suggested vacuum measurement products and question & answers.
Marine and IS approved, -1 to 3 mWG compound range pressure transmitter
Pressure transmitter with Marine type approvals and a compound pressure range of -1000 to +3000 mWG.
450 mmHg vacuum range pressure gauge
The Baroli 05 pressure gauge can be supplied with a negative gauge vacuum range and display the pressure in millimetres of mercury (mmHg) pressure units.
Vacuum Logger for sewer system with flush diaphragm & intrinsic safety
Vacuum logger with ATEX hazardous area approval and flush diaphragm to monitor the vacuum supplied to a vacuum sewer system from a distant vacuum pump station.
Negative room pressure monitor and logger for multiple zones
Monitoring system to measure negative room pressure inside each of five interior zones to eliminate the spread of dust.
Vacuum differential pressure transducer with 60kPa range
Vacuum differential transducer for using with a variable frequency drive to control vacuum air pressures down to 60 kilopascals (kPa).
0 to -2000 Pa vacuum transmitter
Pressure transmitter with a 0 to minus 2000 pascal pressure range and 2 wire 4 to 20 mA output signal. DMP343 Low Range Pressure Sensor Pressure Range: 0 to minus 20 mbar (-2000 Pa) gauge Output Signal: 4-20mA (2 wire) Electrical Connection: DIN43650A plug IP65 Pressure Connection: G1/2 DIN 3852 male
Vacuum range manometer for leak testing in hazardous areas
Intrinsically safe manometer which can read from a few mbar absolute to atmospheric pressure for investigating vacuum leaks.
Air scrubber 10 inH2O partial vacuum pressure transmitter
Negative air pressure transmitter with a loop powered 4-20mA signal to monitor vacuum in an air scrubber system down to minus 10 inH2o compared to atmosphere.
HART coms compatible vacuum transmitter for -1 to 0 bar g
HART enabled 4-20mA vacuum transmitter to monitor over the range of -1 to 0 bar with a 1/2″ BSP thread process connector.