SI-1185 Intelligent Pressure Sensor

SI-1185 Intelligent Pressure Sensor

Intelligent Pressure Sensor is also called Intelligent Pressure Transducer.
SI-1185 Intelligent Pressure Sensor converts the pressure signal of the measured medium into a 4~20mADC standard signal or superimposes a HART digital signal or RS485 signal. Realize remote control. Support fieldbus-based field control technology upgrades. Integrated structural design and standardization Signal output, small size, high precision, light weight, wide range coverage. It is suitable for places in various industries that require precise measurement of fluid pressure or liquid level.

Features of Intelligent Pressure Sensor

  • High precision, using digital compensation and nonlinear correction technology.
  • Pressure type optional: gauge pressure, absolute pressure, negative pressure
  • -10℃~80℃ digital temperature compensation without breakpoint, strong anti-electromagnetic compatibility ability
  • Small size, high stability, high sensitivity, high cost performance
  • A variety of process connections and electrical connections can be customized according to customer requirements
  • Optional digital communication function, RS485 communication or HART communication protocol
  • Support networking applications

SI-1185 Intelligent Pressure Sensor Specifications

Measuring medium:Various liquids, gases and vapors compatible with 304, 316L stainless steel
Overload:1.5 times full scale pressure
Pressure type:Gauge or absolute or sealed gauge
Accuracy:±0.2%FS; ±0.5%FS
Long-term stability:±0.2%FS/year
Zero temperature coefficient:±0.03%FS/°C (reference 25°C)
Full scale temperature coefficient:±0.03%FS/°C (reference 25°C)
Compensation temperature:-10~80℃
Medium temperature:-35~85℃, -35~200℃, high temperature is greater than
200 degrees can be customized according to customer requirements, the actual temperature range of the product measurement medium please
Refer to the temperature range printed on the product nameplate.
Operating temperature:-30~85℃
Storage temperature:-40~120℃
Power supply:24VDC (12~28V)
Output signal:4-20mA; 0-5VDC; 0-10VDC;
4-20mA+HART; RS485, customer optional
Load capacity:≤(U-10)/0.20Ω; RS485 bus can connect 99 transmitters
Insulation resistance:100MΩ,500VDC
Shell protection:IP65

Order Guide

SI-1185Intelligent Pressure Sensor
CodeOutput Signal
CodeProcess Connection
CodeElectrical connections
C1Hirschman joint
C2cable output
C3Aviation Connector
CodeStructural materials
M3TantalumHastelloy C316L
CodeAdditional functions
GGauge pressure (default)
AAbsolute pressure
SSealed gauge pressure
vViton O-ring (default)
jNitrile O-ring
WWaterproof and breathable treatment
SI-1185  (0-1)MPa B1B7  P1 C1  M1 Gv

Intelligent Pressure Sensor Applications

  • Hydraulic and pneumatic control system
  • Liquid level measurement and control, building automation, constant pressure water supply
  • Petrochemical, environmental protection, energy, machinery and equipment industries
  • Ships, utility vehicles and mobile hydraulic equipment
  • Laboratory, industrial process detection and control
  • Equipment automation, automatic control and detection system
  • The urban pipe network, oil field pipeline, and pressure network of large and small hydropower stations form a twisted pair network through the RS485 bus, which is especially suitable for computer control systems;


Smart pressure sensor is The Ideal Choice for Pressure Monitoring Applications.
The intelligent pressure sensor converts the measured physical quantity into a corresponding electrical signal and sends it to the signal dispatching circuit.
Smart pressure sensor can better adopt digital compensation and nonlinear correction technology than ordinary pressure sensor. The optional RS485 interface/HART protocol can configure a more intelligent pressure monitoring and control system.

The most common are diffused silicon pressure sensors and capacitive pressure sensors.

  1. Diffused silicon pressure sensor.

Its working principle is based on piezoresistive effect, using the principle of piezoresistive effect. The pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramics). Make the diaphragm produce a micro-displacement proportional to the medium pressure. The resistance value of the sensor is changed, and the change is detected by the electronic circuit. And convert and output a standard measurement signal corresponding to this pressure.

It is characterized by small size, light weight, stable performance, and is suitable for making small-range transmitters. Mainly used in process control systems, pressure calibration instruments, hydraulic systems, biomedical instruments, hydraulic systems and valves, liquid level measurement, refrigeration equipment and HVAC control industries.

  1. Capacitive pressure sensor.

It is a pressure sensor that uses capacitive sensitive elements to convert the measured pressure into an electrical output that has a certain relationship with it.
It generally uses a circular metal film or metallized film as an electrode of the capacitor. When the membrane deforms under pressure, the capacitance formed between the membrane and the fixed electrode changes. By measuring the circuit, an electrical signal that has a certain relationship with the voltage can be output.

It has low input energy, high dynamic response, and small natural effects. Good environmental adaptability and other characteristics. Among them, the ceramic capacitive pressure sensor can be widely used in the pressure detection of various media such as water, gas and liquid due to its advantages of corrosion resistance, impact resistance, no hysteresis, and strong media compatibility.

Different types of pressure sensors have different operating principles. Let’s take a brief look below.

How the pressure sensor works:

  1. Piezoresistive force sensor: Resistance strain gauge is one of the main components of piezoresistive strain sensor. The working principle of the metal resistance strain gauge is the phenomenon that the strain resistance changes with mechanical deformation when it is adsorbed on the base material. Commonly known as the resistance strain effect.
  2. Ceramic pressure sensor: Ceramic pressure sensor is based on piezoresistive effect. The pressure acts directly on the front surface of the ceramic diaphragm. Make the diaphragm slightly deformed. Thick film resistors are printed on the back of the ceramic diaphragm and connected to form a Wheatstone bridge. Due to the piezoresistive effect of the varistor, the bridge produces a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated as 2.0/3.0/3.3mV/V according to different pressure ranges, which can be compatible with strain gauge sensors.
  3. Diffused silicon pressure sensor: The working principle of the diffused silicon pressure sensor is also based on the piezoresistive effect. Using the principle of piezoresistive effect, the pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramics). Make the diaphragm produce a micro-displacement proportional to the medium pressure, and change the resistance value of the sensor. The electronic circuit detects this change, and converts and outputs a standard measurement signal corresponding to this pressure.
  4. Sapphire pressure sensor: Using the working principle of strain resistance, silicon-sapphire is used as the semiconductor sensitive element. With unrivaled metrological properties. Therefore, the semiconductor sensitive element made of silicon-sapphire is not sensitive to temperature changes, and has good working characteristics even under high temperature conditions. Sapphire is extremely resistant to radiation. In addition, the silicon-sapphire semiconductor sensitive element has no p-n drift.
  5. Piezoelectric pressure sensor: The piezoelectric effect is the main working principle of the piezoelectric sensor. Piezoelectric sensors cannot be used for static measurements. Because the charge after the external force is only preserved when the circuit has infinite input impedance. The actual situation is not like this. So this determines that the piezoelectric sensor can only measure dynamic stress.

More Featured Pressure Sensors

Sino-Inst is a manufacturer of Intelligent Pressure Sensors. We supply more than 20 types of Intelligent Pressure Sensors.

There are many types of pressure sensors, such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, Silicon piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors and capacitive sensors.

The Intelligent Pressure Sensors adopts high-precision and high-stability chip assembly of imported stainless steel isolation diaphragms. The product is manufactured through precise structural design, reasonable temperature compensation, linear processing circuit, V/I converted and steel seding fully shell.

SI-1185 Intelligent Pressure Sensors output signal 4~20mA, 0~10mA, 0~5VDC, etc. RS485 interface/HART protocol optional. The product can be used to measure the pressure of high temperature gas, liquid and steam and the pressure of corrosive medium. According to needs, it can be equipped with a linear 100% pointer gauge or a digital display gauge.

Sino-Inst has provided pressure measurement solutions to customers for many years. Our pressure sensor, made in China. Widely exported to the United States, Britain, Germany, South Africa, Norway and other countries.

If you need SI-1185 Intelligent Pressure Sensors, but have technical questions, please feel free to contact our sales engineers.

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