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.
For example if the inlet pressure of a vacuum pump is at 900 mbar absolute and it is connected to a closed chamber at an atmospheric pressure of 1000 mbar absolute, the resulting suction pressure is 100 millibar negative gauge, which will draw down the pressure in the chamber from 1000 to 900 mbar absolute.
Suction pressure applications are prevalent across diverse industries. These include, but are not limited to, vacuum systems used in semiconductor manufacturing, HVAC systems where fans create negative pressure to circulate air, medical applications such as ventilators and suction equipment, and industrial processes involving pumps and compressors.
Vacuum, Suction Pressure Data Loggers, Recorders - Select vacuum data loggers for precise recording of negative suction and absolute pressures. Ideal for process analysis, test reports, and system validation in industrial and research settings.
Suction Pressure Sensors - Suction pressure sensors for measuring negative gauge reference pressure. Select pressure sensors for measuring the level of pressure below ambient atmospheric pressure.- Suction Pressure Transducers - Choose suction pressure transducers with 0-5V or 0-10Vdc outputs. Ideal for measuring suction from millibars to 1 bar, ensuring linear and precise vacuum monitoring.
Suction Pressure Calibration Equipment - Select a calibration equipment for calibrating suction pressure measuring devices, and generating suction pressure for setting calibration points.
DM01 Multi-Range High Accuracy Pressure Gauge
DPS200 HVAC Differential Pressure Transmitter
IMPLR Low Range All Stainless Steel OEM Pressure Sensor- IMP Low Cost Pressure Sensor
DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor- LEO Record (Ei) Pressure Data Logger
DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor
DPS Low Differential Pressure Transmitter
DMK457 Marine Approved Pressure Transmitter
DMP457 Marine Approved Pressure Transmitter
Baroli 02 Precision Digital Pressure Gauge
Baroli 02P Low Range Flush Diaphragm Digital Pressure Gauge
- -10…30 kPa g compound range inert gas pressure transmitter for ship IG system - An intrinsically safe, marine approved compound range pressure transmitter for ship cargo tank IG system use to measure pressure of inert gas over a range of -10 to 30 kPa g from the G1/2 male process connection, and sending the corresponding 4-20mA signal through the DIN plug electrical connection.
ATEX approved negative 10 mbar vacuum pressure transmitter - ATEX certified intrinsically safe pressure transmitter for measuring from 0 to minus 10 millibar gauge vacuum pressure.
Portable vacuum sensor tester for industrial control loop set-point validation - High precision vacuum calibration kit designed for technicians verifying sensor set-points from atmospheric pressure down to -0.95 bar with fine-tuning control.- -100 mbar digital vacuum gauge - Measure vacuum down to -100 mbar with this digital vacuum gauge. Ideal for industrial and laboratory applications.
Vacuum gauge for minus 150 mbar range with a 0.1 mbar display resolution - We are looking to measure have to measure vacuum from zero to -150mbar to a resolution of 0.1 milibar
Vacuum transmitter for chlorine, hydrogen chloride and nitrogen oxide gas with NaOH solution - Capacitive ceramic sensor with PVDF and FFKM materials provides a stable vacuum measurement in gas scrubbers containing chlorine, HCl, and NOx, plus NaOH solution.
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- 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.
Remote cellular monitoring of low-range gas blanketing pressure - Complete wireless sensor solution for monitoring low-range gas blanketing pressure on remote saltwater storage tanks. This system provides cellular data access and automated SMS or email alerts for pressure deviations and vacuum conditions.- Measuring negative pressure in hospital construction zones with a low range differential pressure transducer - Low-range differential pressure transmitter provides the resolution needed to verify negative pressure in hospital construction vestibules, ensuring containment of dust and airborne contaminants.
- Monitoring vacuum depression in food powder drying towers with a low range dp transmitter - DP transmitter for precise vacuum measurement and control for coconut powder drying towers to ensure consistent product quality.
Solvent tank nitrogen blanketing monitoring with all welded IS/SIL2 bidirectional pressure transmitter - Discover a solution for measuring low nitrogen blanket pressure in flammable solvent tanks. This application story details the use of an all-welded, intrinsically safe pressure transmitter with SIL2 certification to ensure chemical compatibility with acetone and alcohols in a Zone 0 environment.
Questions & Answers
Applying negative pressure to pressure transducer
What happens inside a pressure transducer when negative pressure is applied?
Before negative pressure is applied, there is an equal pressure on the front and rear side of the sensor diaphragm. When the negative pressure is applied, the rear side pressure is now higher than the front side pressure. This causes the sensing diaphragm to flex in the reverse direction resulting in a negative output signal. The negative output signal is often converted to a standardised positive signal such as 4-20mA, 0-10V or 0-5V.
Sensor types for measuring suction pressure
What type of sensing technology is used for measuring suction pressure?
For suction pressures in the range of 0-10 mbar (~0.15 psi) up to
0-1000 mbar (~15psi) it is possible to use strain gauge diaphragm technology. For ranges 0-0.1 mbar up to 0-10 mbar the sensitivity is too small and errors are too great to use a strain gauge diaphragm, so for very low pressures a more sensitive technology such as variable capacitance, inductive or LVDT is used.
Using suction pressure gauge to simulate altitude
Is it possible to use a gauge which reads a vacuum from 0 to -1 bar and convert it to an altitude reading for purposes of simulating altitude testing?
A 0 to -1 bar gauge reference range does not have a fixed reference because the zero reading floats on the atmospheric pressure reading which is constantly changing. In order to set an altitude you need to be able to set the same absolute pressure each time. This would only be possible with a 0 to -1 bar gauge range if you were able to compensate for atmospheric pressure. So it is not going to work unless you are able to continuously compensate for the local atmospheric pressure changes.
Difference between suction pressure & vacuum
What is the difference between suction pressure and vacuum?
Suction pressure is always measured by the amount of pressure below atmospheric pressure e.g. a suction pressure of 100 mbar means 100 mbar below the atmospheric air pressire. Vacuum pressure is similar but should be referred to perfect vacuum e.g. a vacuum of 100 mbar means 100 mbar above a perfect vacuum.
However vacuum is often confused with suction pressure so a pressure described as a vacuum should always be verified to ascertain whether it is referred to atmospheric pressure or a perfect vacuum.
Related Help Guides
- Measuring vacuum with negative gauge or absolute ranges
- What is the difference between vacuum and absolute pressure
- What does negative and positive gauge pressure mean
- Measuring negative pressure using a positive differential pressure range
- Measuring vacuum as a negative gauge pressure using a dp sensor
- Can you measure vacuum using a gauge pressure range
- Can you have a minus 20 psi gauge vacuum measurement range
- Measuring vacuum as an absolute range using a dp sensor
- Output signal orientation for a negative gauge pressure range
Related Technical Terms
Related Online Tools
Related Product and Application Guides
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