What is a Pressure Transmitter?
In many industries, knowing the exact pressure of liquids, gases, or steam is crucial. This is where a pressure transmitter comes into play. Think of it as a “digital sensor” that measures pressure and sends that measurement as an electrical signal to other equipment, like a control system or display.
A pressure transmitter is a device that senses the pressure of a fluid or gas and converts that pressure reading into an electrical signal. This signal is then transmitted to a monitoring system for further action or analysis.
How Does It Work?
The process can be broken down into three simple steps:
- Sensing the Pressure: Inside the transmitter is a sensor that detects the pressure exerted by the fluid (such as air, water, or oil). This sensor might be based on a strain gauge or a piezoelectric sensor that reacts to pressure.
Converting Pressure to an Electrical Signal: Once the pressure is detected, the sensor converts it into an electrical signal. The strength of this signal corresponds to the amount of pressure being applied. For example, if the pressure is high, the signal will be stronger, and if the pressure is low, the signal will be weaker. Common electrical signals used are 4-20 milliamps or digital signals.
Sending the Signal: The electrical signal is then sent to a control system, often a Programmable Logic Controller (PLC), where it is monitored and processed. This signal can be used to adjust equipment, like a valve or pump, to maintain the desired pressure level.
Pressure Transmitter (Compact Type)
SP pressure transmitter and SH level transmitter can be used to continuously measure the pressure ‘liquid level’ of the
process fluid (liquid, gas, steam) and convert it into 4-20mA standard signal and unit instrument or DCS system PLC.
Combination, constitutes an automatic control system. Widely used in petroleum, chemical, metallurgy, electric power, food, beer, textile, pharmaceutical and other industries for process control and measurement.
Reference accuracy O .2%FS. O.5%FS
Measuring medium: Liquid, gas, or steam
Output signal: 4-20mA, 4-20mA+HART, 0-5VDC, Modbus-RTU/RS485, others
Power Supply: 24VDC
Temperature effect (-15-80’C)
Process connection: M20*1.5(M), G1/2(M), G1/4 (M), 1/2-14NPT(M) as required
Electrical Connections: 1/2”NPT or M20*1.5
- Food and Beverage Industry
- Environmental Monitoring
- Oil and Gas Industry
- Pharmaceutical Industry
- Chemical Industrial
- Process control System
- Electric Power
Range: 0-1000 bar
Powered: 24 VDC
Output: 4-20 mA RS485 Modbus
Connect: Tri Clamp, Thread, Flange Small, Light, Easy Installation
Differential Pressure Transmitter
A differential pressure transmitter or pressure transmitter measures the pressure difference between two points. It outputs a standard signal of 4–20 mA. Unlike a standard pressure transmitter, the differential pressure transmitter has two pressure ports: one for the positive side and one for the negative side.
Typically, the pressure on the positive side is higher than that on the negative side under normal operating conditions.
- Process Fluid: Liquid, Gas, Vapor
- Diaphragm material: SUS316L, Hastelloy C
- Current Output: 4 – 20 mA 2 wires Hart Protocol
- Power Supply: 24VDC
- Process connections: 1/4 – 18 NPT or 1/2 – 14 NPT
Process control system
Petroleum industry
Chemical industry
Process Fluid: Liquid, gas, or steam flow as well as liquid level, density and pressure
Measuring range: 200Pa-10MPa
Working Temperature: -25 to +95C
Current Output: 4 – 20 mA 2 wires Hart Protocol
Power Supply: 24VDC
Ambient Temperature: -25 to +120C
Process connections: 1/4 – 18 NPT or 1/2 – 14 NPT
Electrical Connections: 1/2”NPT or M20*1.5
Enclosure:IP65
Intrinsically Safe: ia II C T6
Explosion proof: d II B T5
Diaphragm material: SUS316L, Hastelloy C
Gauge Pressure Transmitter
The SP pressure transmitter and SH level transmitter are used to continuously measure the pressure or liquid level of process fluids such as liquids, gases, or steam. They convert the measured values into a standard 4–20 mA signal, which can be transmitted to unit instruments, DCS systems, or PLCs. When integrated, they form part of an automatic control system.
These transmitters are widely used in industries such as petroleum, chemical, metallurgy, electric power, food, brewing, textiles, and pharmaceuticals for process control and measurement.
- Application: liquid, gas, steam
- Output: 4-20mA, modbus, 0-10V, 0-5V
- Measurement range: 0~100Mpa
- Process connection: Thread
- English LCD display
- Certificate: CE, SIL3, ISO9001, Explosion Proof
Process control system
Food industry
Chemical industry
Petroleum industry
Measuring range: 0-100MPa
Stability. Better than O.25% FS per year
Impact of installation location, no effect
Temperature effect (-15-50’C)
Less than O.15% / l0’C
Operating voltage. 15V -30V DC
Ambient temperature -10’C -70’C
Medium temperature -40’C – 120’C
Storage temperature. -40’C – 11O’C
Compensation temperature -15’C -50’C
