Explosion Proof Pressure transmitter, or explosion proof pressure transducer, with the explosion proof enclosure. For applications in hazardous areas. Class I, Division 1. Flameproof ExdIIBT5Gb; Intrinsically safe ExiaIICT4/T5/T6Ga.

Explosion-proof Pressure Transmitter

SIEP489 Explosion proof pressure Transmitter is a microprocessor-based high-performance transmitter. SIEP489 has flexible pressure calibration, push button configuration, and programmable using HART® Communication. We also supply industrial pressure sensors, and explosion proof differential pressure transmitter.
All our electronic pressure transducers can be offered with Explosion-proof. Select explosion-proof pressure transmitters with Ex d certification and 4-20mA output signals for installation. These installations require the use of equipment and enclosures designated as containing internal explosives. This prevents ignition of the explosive environment surrounding the equipment ( Specified) Flameproof area.

Sino-Inst offers a variety of Explosion proof pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

Features of Explosion Proof Pressure Transmitter

  • FM approved as “explosion-proof” for class I, div. 1 hazardous areas
  • Available with ATEX approval “flameproof enclosure” for II 2 G Ex d II C
  • Current or voltage output
  • Designed for harsh ambient conditions
  • Low-power version available as an option

SI-EP489 Smart Pressure Transmitters have been designed for industrial oil and gas applications.The SI-EP489 is capable of being configured with the zero and span buttons, a field calibrator is not required for configuration. The transmitter software compensates for thermal effects, improving performance.These pressure transmitters can be delivered with analog signals including 4 … 20 mA or a low-power version with 1 … 5 VDC. They feature exceptionally high resistance to vibration, pressure spikes and moisture ingress.

In addition, these pressure transmitters also achieve IP65 / IP 67 (NEMA 4x) protection level.
On each individual instrument, comprehensive quality control and calibration are performed. Therefore, accuracy of ≤0.25% BFSL can be ensured.
Even in the case of severe fluctuations in ambient temperature, temperature compensation can ensure accuracy and long-term stability.
The SIEP489 model is suitable for acid gas applications. It has a high resistance to stress cracking when sulfides come into contact with sulfur-containing gases.
Pressure transmitters are approved as “Explosion-proof” products of Class I, II, III, and Div. FM and CSA have 1 hazardous area. II 2 G Ex d II C to ATEX have a “fire protection” function.

Specifications of SIEP489 explosion-proof pressure transmitter:

Standard range
Pressure typeGauge pressure, absolute pressure, sealing pressure
Pressure range (bar)1 1.6 2.5 4 6 10 16 25 40 60 100 160 200 250 300 400 500 600 750 1000 1500
Pressure range (psi)15 30 50 75 100 200 300 500 750 1K 1.5K 3K 5K 10K 12K 15K 25K
Technical Specifications
Accuracy±0.3 %FS    ±0.5 %FS
Long-term stability (1 year)±0.25 %FS
Response frequency (-3DB)3.2kHz
Temperature compensation-20~+85℃
Storage temperature-40~+125℃
Load ResistanceVoltage output: RL > 100KΩ, current output: RL≤ (supply voltage-9V) / 20mA
Overload pressure150% FS (Range < 6Bar) 300% FS (Range≥6Bar)
Destruction pressure200% FS (Range < 6Bar) 500% FS (Range≥6Bar, limit 10000Bar)
Mechanical vibration±20g
Shock (11mS)100g
Protection levelIP65
material17-4PH (Range≥6Bar) 304 or 316L (Range <6Bar)
Electrical connectionsDirect lead
Pressure interfaceM20X1.5   G1 / 4       NPT1 / 4 (others can be customized)
Explosion-proof gradeExd II CT6 Gb
Signal output4~20 mA0.5 ~ 4.5VDC (proportional output)0.5~4.5VDC0~5VDC0~10VDCRS485RS232
Signal line specifications2 Wire3 Wire3 Wire3 Wire3 Wire4 Wire4 Wire
Supply voltage9~30VDC5VDC9~30VDC9~30VDC15~30VDC9~30VDC9~30VDC
explosion-proof pressure transmitter drawing
Explosion proof pressure transmitter drawing

Applications of explosion-proof pressure transmitter

Oil & Gas equipment needs a pressure transducer, that is reliable and able to withstand extreme environmental and pressure conditions.

  • Borehole monitoring
  • Oil Field Equipment
  • Refineries and petrochemical industry
  • Drilling platforms and pipelines
  • Upstream Oil and Gas Production
  • Natural Gas Compression and Transfer Control
  • Alternative Energy     
  • Industrial and OEM Applications

We can provide maintenance, calibration and other services of the same type of products. Such as WIKA, Rosemount pressure transmitter.

Contact us now to see how we can help you with a pressure gauge solution that fits your exact needs.

Know More About Explosion-proof pressure transmitter

Explosion-proof pressure transmitters are available in a wide range of specifications,
easy to install and use, safe and explosion-proof.
They can be widely used in petrochemical, electric power, metallurgy, pharmaceutical, food processing, and other industries.

Products comply with the “IEC” standard, and explosion-proof pressure transmitters are internationally renowned.
The company’s high-precision, high-stability pressure sensor components,
through high-reliability amplifier circuit and precise temperature compensation,
convert the absolute or gauge pressure of the measured medium into 4~20mA, 0~5VDC, 0~10VDC, and 1~5VDC.
Such as standard electrical signals.
High-quality sensors hermetically sealed soldering technology,
and a complete assembly process ensures excellent quality and performance.
The product is available in a variety of interface styles.
And a variety of lead styles to best meet customer needs.
And is suitable for use with a variety of measurement and control equipment.

Explosion-proof pressure transmitter working principle

The explosion-proof pressure transmitter consists of an integrated intelligent sensor and peripheral circuits.
The sensor part is composed of a pressure sensor, a signal modulation circuit, a dedicated digital processing chip, a temperature sensor and data memory, and the peripheral electronic circuit part is composed of an LCD display, function keys and an EMC circuit.
The pressure signal is converted into an electrical signal by the pressure sensor. And the electrical signal is modulated. And sent to a dedicated digital processing chip for data processing.
And then converted into a 4~20 mA output signal corresponding to the pressure signal.
And the HART digital signal is superimposed on the current signal for communication.

Technical Support

Explosion-proof differential pressure transmitter

Explosion-proof differential pressure transmitter is used to measure the liquid level, flow rate and pressure of liquid, gas or steam under high working pressure environment. Then converted into 4 ~ 20mA DC signal output. Intelligent type can communicate with HART Communicator.


Steam pressure transmitter

High Temperature Pressure Transducer/Transmitter for measuring pressure in hot environments. Liquids or gases up to 850 ° C. Such as steam, food processing & engine monitoring.

Application of high temperature pressure transmitter in steam pipeline.


Water pressure transmitter

Liquid level sensors also called a water pressure sensor, or water pressure transducer. SI-10 liquid pressure sensor uses waterproof device to achieve IP68 waterproof rating. Like: water pipe pressure, oil pressure for pipe or tank.SI-10 liquid pressure sensor is a piezoresistive silicon pressure sensor. 


Natural gas pressure transducer

Gas pressure sensor for industrial gas pressure monitoring. Pagoda gas nozzle Φ8. Such SI-503K Pagoda Joint Gas Pressure sensor uses stainless steel as a whole. High-precision strain gage and advanced technology. It has high sensitivity, stable performance and good impact resistance.



What is specified by the temperature coefficient and how is it important to my readings?

As the ambient temperature changes, the output current will drift slightly.
The temperature coefficient specifies the amount of drift per °F/°C.
Since the temperature affects the transmitter output, the temperature coefficient is important to accuracy of your reading.

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Please provide your measurement parameters or details. Sino-Instrument support customer customization and OEM

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