Yibi diaphragm pressure transmitter

1、 Working principle

1. The pressure of the measured medium acts on the isolation diaphragm (stainless steel/Hastelloy/titanium alloy), causing slight deformation;

2. Deformation is non destructively transmitted to the internal pressure sensitive core (piezoresistive/capacitive) through a sealed filling liquid (silicone oil/inert liquid);

3. The core converts pressure into weak electrical signals, which are amplified, temperature compensated, and linearized to output 4-20mA (two-wire system), 0-5V, or HART/Modbus digital signals for DCS/PLC acquisition and control.

2、 Core structure

• Isolation diaphragm componentDirectly in contact with the medium, the material can be selected from 316L, Hastelloy C, titanium, PTFE coating, which is corrosion-resistant and anti clogging;

• Filling fluidHigh temperature silicone oil (-40~125 ℃), low-temperature special liquid, insulation, stability, low expansion coefficient;

• Sensing and Signal ModuleDiffuse silicon/monocrystalline silicon piezoresistive core or capacitor core, integrated signal conditioning and communication circuit;

• Shell and interfaceIP65/IP67 protection, process connection with flange (DN25/DN50), sanitary chuck (3A standard) or thread, suitable for reaction kettle, pipeline, storage tank.

3、 Main technical parameters

• rangeMicro pressure 0-100kPa, atmospheric pressure 0.1-6MPa, high pressure 6-100MPa;

• precision± 0.1% FS, ± 0.2% FS, ± 0.5% FS (optional);

• temperature range: Medium -40-125 ℃, environment -30-80 ℃;

• output signal4-20mA DC (two-wire system) HART、Modbus RTU；

• diaphragm material：316L、 Hastelloy C-276, titanium, tantalum, PTFE coating;

• Protection levelIP65 (standard), IP67 (optional).

4、 Product advantages

1. Strong corrosion resistanceAdapt to acid-base, salt spray, and organic solvents (pH 2-12) to extend the lifespan of the instrument;

2. Anti blocking and maintenance freeFlat diaphragm without pressure holes, suitable for high viscosity/particle containing media such as mud, crude oil, asphalt, and solid slurry;

3. Sanitary grade designCompliant with GMP/3A standards, supports CIP on-site cleaning, used for food, pharmaceutical, and biological fermentation tanks;

4. wide temperature stabilityBuilt in temperature compensation, small measurement drift and good repeatability under high and low temperature conditions;

5. Flexible installationIt can be directly installed on flanges or remotely transmitted through capillary tubes, suitable for high temperature, vibration, and limited space scenarios.

5、 Typical application scenarios

• chemical industryPressure/liquid level monitoring of reaction vessels, acid-base pipelines, and crystallization media;

• oil and gasMeasurement of wellhead/pipeline pressure for crude oil, mud, and sulfur-containing media;

• Food and MedicineHygienic pressure/liquid level control for fermentation tanks, ingredient tanks, and sterile conveyor lines;

• Environmentally Friendly Water TreatmentPressure/liquid level monitoring of sludge tanks, sewage pipelines, and reverse osmosis systems;

• Metallurgical building materialsHigh temperature melt, slurry, and dust removal pipeline pressure detection.

6、 Key selection points

1. Media compatibilitySelect diaphragm material according to corrosion level (such as Hastelloy for strong acids and PTFE coating for strong alkalis);

2. Range matchingSelect 30% to 70% of the actual pressure range, balancing accuracy and overload capacity;

3. temperature adaptationChoose high-temperature silicone oil for high-temperature conditions, and add heat sinks or capillary tubes for remote transmission if overheating occurs;

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