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 Series Supply Voltage
RS庫存編號 804-3884
製造零件編號7MF4033-1BA00-2RB1
BrandSiemens
HK$21,954.38
單位
Relative 0.01bar 1bar - Current Oil G1/2 4 → 20 mA M20 Cable Entry - - 20 mA - 9 → 24 V
RS庫存編號 125-3729
製造零件編號7MF1567-3DA00-1AA1
BrandSiemens
HK$2,477.97
單位
Relative 0bar 100bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA - 7 → 33 V dc
RS庫存編號 804-3890
製造零件編號7MF4033-1EA00-2RB1
BrandSiemens
HK$16,801.96
單位
Relative 0.63bar 63bar - Current Oil G1/2 4 → 20 mA M20 Cable Entry - - 20 mA - 9 → 24 V
RS庫存編號 125-3726
製造零件編號7MF1565-3BG00-1AA1
BrandSiemens
HK$2,477.97
單位
Relative 0bar 6bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA - 7 → 33 V dc
RS庫存編號 125-3721
製造零件編號7MF1565-3CG00-1AA1
BrandSiemens
HK$2,477.97
單位
Relative 0bar 60bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA - 7 → 33 V dc
RS庫存編號 125-3728
製造零件編號7MF1565-3CD00-1AA1
BrandSiemens
HK$2,477.97
單位
Relative 0bar 25bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA - 7 → 33 V dc
RS庫存編號 125-3720
製造零件編號7MF1565-3CE00-1AA1
BrandSiemens
HK$2,477.97
單位
Relative 0bar 40bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA - 7 → 33 V dc
RS庫存編號 125-3725
製造零件編號7MF1565-3BE00-1AA1
BrandSiemens
HK$2,477.97
單位
Relative 0bar 4bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA - 7 → 33 V dc
RS庫存編號 804-3897
製造零件編號7MF4033-1CA00-2RB1
BrandSiemens
HK$21,566.67
單位
Relative 0.04bar 4bar - Current Oil G1/2 4 → 20 mA M20 Cable Entry - - 20 mA - 9 → 24 V
RS庫存編號 125-3724
製造零件編號7MF1565-3BD00-1AA1
BrandSiemens
HK$2,477.97
單位
Relative 0bar 2.5bar 0.25 % Analogue Aggressive Media, Gas, Liquid, Non-Aggressive Media, Vapour G1/2 4 → 20 mA DIN EN 175301 Connector, M16 - <5 ms 20 mA - 7 → 33 V dc