Pressure Sensors

Pressure sensors are devices that sense the applied pressure of gases or liquids. The output of the measurement is then converted into an electrical signal which reflects the amount of pressure applied.

There are various technologies used within pressure sensors. Depending on the requirements, this can influence their sensing accuracy and reliability. When the mechanical displacement within the sensor is turned into an electrical output signal there are 5 ways this can happen.


Resistive - These types of sensors use the change in electrical resistance of a strain gauge connected to the diaphragm.

Capacitive - Are highly sensitive and are able to measure low pressure under 10 bar while still withstanding large overloads.

Piezoelectric - These sensors use substances like Quartz to generate a charge on the surface when pressure is applied. Piezoelectric pressure sensors are ideal for measuring fast changing pressures.

Optical - These use interferometry to measure pressure changes in optical fibre. They are not disturbed by EMI and can be used in noisy or medical environments.


MEMS - This stands for micro-electro-mechanical system and contains capacitive or piezo pressure sensing mechanisms on silicon at micron level resolution.

Types of Pressure Sensors

Within the sensors, there are various properties which can be used to classify them. This includes what pressure range they measure, their operating temperature range or the pressure type they measure.

Absolute Pressure Sensor - This type of sensor measures pressure relative to the perfect vacuum (zero reference point).

Gauge Pressure Sensors - These are often used to measure atmospheric pressure and are sometimes referred to as relative pressure sensors.

Sealed Gauge Pressure Sensor - Like a gauge pressure sensor except they measure pressure relative to a fixed pressure, not the current ambient atmospheric pressure which can vary.

Differential Pressure Sensors - These can be used to measure the difference between two different pressures (differential pressure) which can be connected to either side of the sensor. They are often used to measure pressure drops, fluid levels and flow rates.

Pressure Sensor Applications

Pressure sensors are used in many applications in a large range of industries. These include medical, aviation, automotive and marine.


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Description Price Pressure Reading Type Minimum Pressure Reading Maximum Pressure Reading Accuracy Output Type Media Measured Process Connection Analogue Output Electrical Connection Communication Protocol Response Time Maximum Current Supply Voltage Interface
RS庫存編號 518-4434
BrandRS PRO
HK$1,167.21
單位
Gauge 0bar 10bar ≤0.5 % Analogue Gas, Liquid G1/4 4 → 20 mA M12 Connector - ≤3 ms - 10 → 30 V dc -
RS庫存編號 324-1018
製造零件編號XMLB010A2S11
HK$2,058.59
單位
Differential 0.7bar 10bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS庫存編號 914-8369
製造零件編號DP101EP
BrandPanasonic
HK$880.83
單位
Gauge -1bar 10bar ±1 % Relay Non-Corrosive Gas G1/8 100 mA Wire Lead - 2.5 ms - 12 → 24 V dc -
RS庫存編號 779-4229
製造零件編號PS61-60-4MGZ-A-SP
HK$302.26
單位
- 400psi 1100psi - SPST-NO Hydraulic BSP 1/4 - Spade Terminal - - 100 VA 42 V dc -
RS庫存編號 609-6912
製造零件編號XMLA002A2S11
HK$2,124.98
單位
Differential 0.15bar 2.5bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS庫存編號 199-399
製造零件編號XMPA12C2131
HK$359.04
單位
Differential 1.3bar 12bar 3.5 % - Air, Fresh Water, Sea Water G1/4 - PG13.5 Cable Gland - - 1.5 A - -
RS庫存編號 361-3384
製造零件編號XMLB010A2S12
HK$1,645.73
單位
Differential 0.7bar 10bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS庫存編號 313-5345
製造零件編號14X1FA1GV1
BrandVega
HK$2,321.18
單位
Relative 0bar 10bar 0.3 % - Fluid, Gas, Vapour G1/2 4 → 20 mA DIN 43650 Connector - - - 12 → 36 V dc -
RS庫存編號 455-4804
製造零件編號3100B0600S01E000
HK$1,138.79
單位
- 0bar 600bar 0.25 % - Air Fluid, Hydraulic Fluid, Hydraulic Oil, Oil G1/4 4 → 20 mA M12 Connector - - - 10 → 36 V dc -
RS庫存編號 399-1628
製造零件編號XMAV12L2135
HK$730.97
單位
Differential 1.3bar 12bar 3.5 % Relay Air, Fresh Water, Sea Water G1/4 - Screw Terminals - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS庫存編號 835-2851
製造零件編號XMLR250M1N25
HK$5,008.88
單位
Differential 0bar 250bar ≤0.1 % Analogue, 1 x NPN Air, Fresh Water, Hydraulic Oil, Refrigerator Fluid G1/4 4 → 20 mA M12 Connector - ≤10 (Analogue) ms, ≤5 (Discrete) ms ≤50 mA 24 V dc -
RS庫存編號 259-6648
製造零件編號6731-0026
BrandHerga
HK$261.56
單位
- 0.08psi 0.9psi 10 % Relay - - - Spade Terminal - - - 250 V ac -
RS庫存編號 779-4200
製造零件編號PS61-10-4MGZ-A-SP
HK$313.26
單位
- 15psi 60psi - SPST-NO Hydraulic BSP 1/4 - Spade Terminal - - 100 VA 42 V dc -
RS庫存編號 797-5011
BrandRS PRO
HK$1,692.92
單位
Relative 0bar 6bar ±0.25 % Current Air, Gas, Hydraulic Fluid, Liquid, Water G1/4 4 → 20 mA DIN 43650 Type C - - 20 mA 9 → 32 V dc -
RS庫存編號 361-3435
製造零件編號XMLA004A2S12
HK$1,164.35
單位
Differential 0.4bar 4bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - M20 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS庫存編號 448-8094
製造零件編號0184457031-SS
BrandSuco
HK$923.91
單位
- 0.5bar 5bar - Relay Air, Heating Oil, Hydraulic Fluid, Turpentine G1/4 - DIN 46350 Connector - - 4 A 250 V -
RS庫存編號 324-0958
製造零件編號XMLA070D2S11
HK$3,496.90
單位
Differential 50bar 70bar 2 % Relay Hydraulic Fluid G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -
RS庫存編號 827-6674
製造零件編號PSE541-R06
BrandSMC
HK$605.19
單位
Relative 0bar -101kPa ±2 % Analogue Air, Gas 6 mm Tube 0.6 → 1 V, 1 → 5 V ZS-28-C Connector - - 15 mA 12 → 24 V dc -
RS庫存編號 181-2090
製造零件編號142PC01D
BrandHoneywell
HK$3,716.04
單位
Differential 0psi 1psi ±0.75 % Amplified Gas - 1 → 6 V PCB - 1 ms 20 mA 7 → 16 V dc -
RS庫存編號 302-5822
製造零件編號XMLA004A2S11
HK$1,446.55
單位
Differential 0.4bar 4bar 2 % Relay Air, Fresh Water, Hydraulic Fluid, Sea Water G1/4 - PG13.5 Cable Gland - - 3 A ac, 100 mA dc 120 → 240 V ac, 250 V dc -