An industrial pressure sensor is a device that converts process pressure into a standardized electrical signal (4-20 mA, 0-5V, RS485 or HART) for control systems, PLCs and SCADA. In industry the terms “pressure sensor”, “pressure transducer” and “pressure transmitter” are often used interchangeably, but they refer to slightly different signal-conditioning stages of the same sensing element.
Sino-Inst provides everything instrument engineers or OEM purchasing personnel need to know:
7 main sensing principles (silicon piezoresistive, single-crystal silicon, capacitive, strain gauge, ceramic, sputtered thin film, resonant), output signal options, application types (inline, submersible, sanitary, waterproof, steam, cryogenic, vacuum, differential pressure, dynamic), industry application cases, a 10-point selection list, and a complete product list.
Sino-Inst is a China-based industrial pressure sensor manufacturer with over 15 years of OEM/ODM experience. Its products are exported to more than 50 countries, and it holds ISO 9001/CE/ATEX certifications.
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Sino-Inst’s diffused silicon pressure sensor has a maximum temperature resistance of 300°C. It has stable performance and high accuracy. It is in stock and at a better price!
Industrial pressure sensors are fundamental process instruments that convert the mechanical pressure of gases, liquids, or vapors into standardized electrical output signals. These signals can be read by PLCs, SCADA controllers, and DCS systems.
The sensing element’s response to pressure manifests as a measurable change in resistance, capacitance, or strain, which is then amplified by signal conditioning circuitry into a proportional voltage (0-10V) or current (4-20mA).
What makes these sensors “industrial grade” rather than commercial or automotive grade is their use of process-grade materials (316L stainless steel, Hastelloy diaphragm, ceramic alumina), wide operating temperature range (-250 °C to +800 °C), high overpressure ratings, IP65/IP68 sealing ratings, and explosion-proof certifications such as CE, ATEX, or IECEx.
Throughout the industry, industrial pressure sensors are based on seven sensing principles, which will be discussed in the next section. Silicon piezoresistive and capacitive technologies dominate in the 0–60 MPa range.
In everyday factory terminology, the terms “pressure sensor,” “pressure converter,” and “pressure transmitter” are often used interchangeably. However, they describe different stages of the same signal chain. Using the names interchangeably is not a problem, but before purchasing, it’s crucial to clarify whether you’ll be receiving a bare sensing element or a finished instrument with a 4-20 mA output; otherwise, it’s easy to discover a missing circuit during on-site commissioning.
To strictly distinguish between the three:
A pressure sensor refers to an exposed sensing element, such as a silicon piezoresistive chip or a capacitive sensor. Its raw output is a small mV/V or pF change.
A pressure transducer encapsulates the sensing element with signal conditioning electronics and provides a low-level analog output, such as 0–5 V or millivolts/volts, suitable for short-distance OEM cabling.
A pressure transmitter further amplifies the processed signal to obtain a stable 4–20 mA loop output, HART, RS485, which is the de facto standard for long-distance industrial cabling and installation in hazardous areas.
A simple rule of thumb: If the transmission distance exceeds 50 meters, the application is to explosion-proof areas, or the device needs to be installed in a PLC/DCS control cabinet, choose a 4-20 mA pressure transmitter. Only purchase bare sensor chips when using self-developed modules or handling bridge and temperature compensation yourself.
Sino-Inst does not strictly distinguish between these three terms in the naming of its industrial pressure transmitter products. For example, the SI-1180 silicon piezoresistive pressure sensor is actually a finished transmitter with 4-20 mA / 0-5 V output; the naming follows industry convention. Therefore, it is essential to specify your required parameters when ordering.
The core differences between industrial pressure sensors lie primarily in their sensing elements. The following seven sensing principles cover the vast majority of industrial measurement scenarios within the 0–600 MPa range. Each differs in accuracy, temperature drift, overload capacity, and media compatibility. Reading this section is sufficient for model selection; for a complete in-depth reading of the 7 sensor principles, including working diagrams, advantage/disadvantage tables, and range parameter comparisons, please refer to this section.
Although there are many measurement principles for pressure sensors, there are 4 types of industrial pressure transmitters commonly used on the market. They are differentiated based on the type of pressure.
Read more about: Differences Between Gauge and Absolute Pressure
The sensitive element of a pressure sensor determines its accuracy limit, while the output signal determines whether it can be connected to a field system. The following five output types cover 95% of industrial applications. Choosing the wrong one may result in: 4-20mA requiring wiring changes for 0-10V boards; RS485 communication without terminating resistors leading to garbled characters; and HART being unreadable on ordinary ADCs.
We have a general guide to output signals, comparing the four mainstream signals side-by-side.
After categorizing by sensing element and output signal, the remaining differences mainly lie in structure and media compatibility. The following 10 types are the most frequently encountered in industrial settings. Media temperature, hygiene requirements, whether it’s submerged in water, and whether it’s a dynamic high-frequency signal will determine which type is most suitable for you.
What are the industrial applications of pressure sensors? The application field of pressure sensors is extremely broad, covering almost all occasions where pressure needs to be monitored and controlled. The following are some typical application areas:
Choosing a pressure sensor is not about buying the most expensive model. It is about matching every parameter on the spec sheet to your actual process. Below are the 10 fields Sino-Inst engineers ask for on every RFQ. Fill them in order and the right model becomes obvious. If two of them are still undecided, send a P&ID snapshot and our engineers will reverse-match a candidate. For the long-form principles behind each point, see the full 10-Point Guide: Selection of Pressure Transmitters.
| # | Parameter | How to fill it in | Engineer’s note |
|---|---|---|---|
| 1 | Range | Process maximum pressure x 1.5, rounded up to the next standard step | Running long-term above 80% of full scale shortens diaphragm life |
| 2 | Pressure type | Gauge / Absolute / Sealed Gauge / Differential | Use Absolute for vacuum work, altitude changes, or sealed vessels. Gauge readings drift below -90 kPa |
| 3 | Process media | Clean water, oil, steam, acid/alkali, slurry, powder, named gas | Decides the diaphragm material: 316L for clean media, Hastelloy C for chlorides and seawater, ceramic or tantalum for strong corrosion |
| 4 | Media temperature | Process min and max temperature | Tip Put range, media, and output signal in the RFQ subject line. With those three our engineers can shortlist a model within 30 minutes. Two fields are most often filled wrong: Media (#3): “water” can mean cooling-tower return (chlorides), recirculated process water (solids), or stagnant fire water. Each needs a different diaphragm. Hazardous area (#9): ATEX Zone 1/2 or IECEx zones cannot run a standard model. Pull the area classification drawing before orderingAbove +85 °C add a cooling siphon. Above +300 °C use a water-cooled body. Below -50 °C choose a low-temp series such as CPT-20SD1 |
| 5 | Accuracy class | 0.5% / 0.25% / 0.1% / 0.075% FS | 0.5% is enough for general industrial use. Custody transfer and calibration standards need 0.1% or better |
| 6 | Output signal | 4-20 mA / 0-5 V / 0-10 V / RS485 / HART / IO-Link | Use 4-20 mA for long field runs. Use 0-10 V for OEM board-level. Use RS485 for multi-drop digital readout |
| 7 | Process connection | G1/4, G1/2, NPT 1/4, NPT 1/2, Tri-Clamp, flange | Specify thread spec and seal type (O-ring, flat face, conical). For flange, give DN and PN |
| 8 | Electrical connector | Hirschmann DIN 43650 / M12 / aviation plug / cable gland direct out | Choose M12 lock for outdoor and high-vibration. Choose potted direct cable for hot, humid, or submerged installations |
| 9 | Ingress / hazardous area | IP65 / IP67 / IP68 plus ATEX / IECEx / Ex d / Ex ia | IP65 minimum for rain exposure, IP68 for underwater. Always state the zone classification for explosive atmospheres |
| 10 | Industry certifications | CE / RoHS / FDA / 3-A / EHEDG / marine class / GOST | Food and pharma need 3-A and EHEDG. Russian orders need GOST. Offshore platforms need DNV or ABS |
Tip
Put range, media, and output signal in the RFQ subject line. With those three our engineers can shortlist a model within 30 minutes.
Two fields are most often filled wrong:
Sino-Inst manufactures pressure sensors, transducers and transmitters in China. The standard catalog covers 50+ SI-series models. OEM and ODM are available with custom range, output, housing material, process connection and electrical connector.
Extreme-condition variants are in regular production: ultra-high pressure (SI-702 series), ultra-high temperature up to 1200 °C with water cooling (SI-2088S), and cryogenic media down to −252 °C (CPT-20SD1).
Customers in the USA, UK, Canada, Italy and Argentina use Sino-Inst sensors in oil & gas, chemical, steam boiler, food, pharma, water treatment and OEM equipment lines.
Send your range, media, output and process connection. Our engineers respond within one business day.
