The capacitive intelligent pressure/differential pressure/level transmitter is a high-precision intelligent instrument independently developed by our company based on years of research and practical experience.

The intelligent pressure/differential pressure/level transmitter uses a sensor core manufactured with ROSEMOUNT technology, combined with advanced digital technology developed by our company to produce a new-generation intelligent transmitter. In principle, a direct digital capacitive circuit is used to replace the analog signal amplification and A/D conversion circuits. Digital compensation technology is used to compensate for temperature and static pressure, improving measurement accuracy and reducing temperature drift. The complete transmitter features a compact size, high reliability, and excellent long-term stability. With an extremely high performance-to-price ratio, this product has become a mainstream product in the transmitter market.

This intelligent pressure/differential pressure/level transmitter features an innovative design principle, a complete range of specifications, easy installation and use, and safe explosion-proof operation. It is particularly known for its high accuracy, compact size, light weight, convenient adjustment, excellent long-term stability, strong unidirectional overload protection, and suitability for harsh environments. Therefore, it enjoys a high reputation in domestic and overseas markets. This series of 0.1-grade capacitive intelligent transmitters includes pressure, differential pressure, absolute pressure, remote-seal, and level models, with corresponding optional accessories. It can be widely used in the power, metallurgy, petrochemical, and instrument processing industries and complies with the requirements of the “IEC” standards implemented in China.

Product Features

·The use of a microprocessor increases flexibility and enhances functionality;

·Strong self-diagnostic capability;

·Wide range coverage: 0～0.2kPa…10MPa;

·High accuracy of 0.1 grade and turndown ratio better than 40:1;

·Zero and span adjustments do not affect each other;

·Both remote and local span and zero adjustment;

·Two-wire system, compliant with the HART protocol, enabling digital communication with ROSEMOUNT 275 and MS-H376 handheld communicators without interrupting the analog output;

·The sensor incorporates non-volatile memory;

·Good stability, high accuracy, adjustable damping, and strong resistance to unidirectional overload;

·No mechanical transmission components, low maintenance workload, robust and vibration-resistant;

·All-purpose components; interchange of the sensor and electronic circuit board does not affect transmitter performance, making maintenance more convenient;

·Diaphragm materials in contact with the medium are optional, with an explosion-proof housing structure;

·Proven superior performance and reliability.

Performance Parameters

Technical Performance

Applicable media: liquids, gases, or vapors

Measurement range: Range 3  0-0.2～6.0kPa

Range 4  0-6.0～40.0kPa

Range 5  0-40.0～200kPa

Range 6  0-0.16～1.0MPa

Range 7  0-0.4～2.0MPa

Range 8  0-1.6～10MPa

Output signal: Linear output: 4~20mA output superimposed with HART protocol digital signal (two-wire system);

Square-root output: Between 1.0%~100% of the input pressure, the output has a square-root relationship with the differential pressure; between 0%~0.1%, the output has a segmented linear relationship with the differential pressure; there is no step change between the 4~20mADC output, and a HART? protocol digital signal is superimposed (two-wire system). Users can select linear or square-root output according to site conditions.

Power supply: External 24V DC power supply (power supply range 14.5V~45V)

Load characteristics: The maximum permissible load resistance in the load-resistance circuit is Rmax=(E-10.5)/0.0236(Ω)

Installation in hazardous locations: Flameproof type Exd Ⅱ CT6;

                Intrinsically safe type Exia Ⅱ CT6;

Load characteristics: After positive or negative range migration, neither the upper nor lower range limit may exceed the range limits. At the minimum range, the maximum positive migration is 0.975URL; the maximum negative migration is -URL. For square-root output, positive and negative migration can be adjusted to 10% of the flow range.

Temperature range: Process temperature　　　　-40～100℃

  　      Storage temperature　　　　-40～100℃

    　    Operating temperature of complete unit　　-40～85℃

Relative humidity: 0～100%

Overpressure limit: Applying a pressure of 0 (absolute pressure)~13.76MPa to either side of the transmitter does not damage the transmitter; the flange can withstand a pressure of 68.9MPa; normal operating pressure should be between 3.45kPa (absolute pressure) and the upper range limit of the transmitter.

Volume displacement: less than 0.16cm3

Damping: The time constant is adjustable between 0.2～32.0s.

Start-up time: 3s, no preheating required.

Performance Specifications:

   (Under conditions of no migration, 316 stainless steel isolation diaphragms, and other standard test conditions.)

    Turndown ratio: 40:1

    Accuracy: Ranges 3, 4, and 5

　　　             For a turndown ratio of 1:1 to 10:1, ±0.1% of the calibrated range,

                      For a turndown ratio of 10:1 to 40:1, ±0.05（1+0.1URL/range）% of the range,

                Range 6, 7, and 8

                      For a turndown ratio of 1:1 to 10:1, ±0.15% of the calibrated range,

                      For a turndown ratio of 10:1 to 40:1, ±0.075（1+0.1URL/range）% of the range,

    Stability: Six-month error is ±0.15% of the maximum range;

    Temperature effect: Ranges 4, 5, 6, 7, and 8

                   Zero error is ±0.25% of the maximum range/55℃.

　　　　　    The total error, including span and zero, is ±0.5% of the maximum range/55℃.

　　　　Note: For Range 3, the temperature error is doubled.

    Overpressure effect: After applying 140kgf/cm2 pressure, the error is ±0.25% of the maximum range.

    Static pressure effect: For linear output, zero error: after applying static pressure of 140kgf/cm2, the zero error for Ranges 4 and 5 is ±0.25% of the maximum range, and the zero error for Ranges 3, 6, 7, and 8 is ±0.5% of the maximum range.

　 Range error: For Ranges 4, 5, 6, 7, and 8, the error is -1±0.25% of the maximum range/6.89MPa; for Range 3, the error is -1.5±0.25% of the maximum range. This is a system error and can be calibrated according to the actual static pressure before installation to eliminate the error.

    Power supply effect: less than 0.005% of output span/V

    Vibration effect: At any axial direction and a frequency of 200Hz, the resulting error is ±0.05% of the maximum range/g.

    Load effect: As long as the voltage input to the transmitter is higher than 14.5V, there is no load effect within the load operating area.

    Installation position effect: May produce a maximum zero-position error of no more than 0.25 kPa, which can be corrected and has no effect on the range;

Rotation of the measuring body relative to the flange has no effect.

    Electromagnetic radiation: Complies with the IEC801 standard

Physical Structure

 Structural materials:

        Isolation diaphragm and vent/drain valve: 316 stainless steel, Hastelloy C, Monel;

　　  Flange and connection: 316 stainless steel, Hastelloy C, Monel;

        “O”-ring (in contact with the measured medium): fluororubber, nitrile rubber, ethylene-propylene;

　　  Fill fluid: silicone oil;

　　  Bolts: galvanized carbon steel, 1Cr18Ni9, 0Cr17Ni4CuNb, 42CrMo;

        Electrical housing: low-copper aluminum alloy;

        Coating: polyester epoxy resin;

        Pressure connection: For Ranges 3, 4, and 5, the two flange connection threads are 1/4-18NPT, with a center distance of 54mm;

　　　　　　　　  Connection: 1/2-14NPT or M20X1.5 male thread; with a ball-cone seal and connection, the center distances are 50.8, 54, and 57.2mm;

        Weight:  3.5kg (excluding options)

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has mainly engaged in the R&D and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow instruments. Its main products include Swiss Metallux ceramic piezoresistive sensors, independently developed ceramic capacitive pressure sensors, diffusion silicon, ceramic piezoresistive, strain-gauge, metal capacitive, and ceramic capacitive pressure transmitters; remote-seal pressure transmitters; high-temperature pressure transmitters; flush diaphragm pressure transmitters; corrosion-resistant pressure transmitters; integrated/split level transmitters; corrosion-resistant level transmitters; lightning-protected level transmitters; high-temperature guided-pressure level transmitters; straight-rod level transmitters; flange level transmitters; wind-pressure transmitters; metal-capacitive differential pressure transmitters; diffusion-silicon differential pressure transmitters; pressure controllers; thermocouples/RTDs; temperature transmitters; and ultrasonic level meters.

Precautions 1. All supplied products come with a certificate of conformity and an instruction manual containing the product number, technical parameters, wiring diagrams, production date, and other information. Please check them carefully to avoid incorrect use. 2. Wiring must be carried out strictly in accordance with our company's operating instructions. 3. This product is a precision instrument. Do not disassemble, impact, or drop it arbitrarily, or poke the sensor with sharp tools. 4. The transmitter can operate immediately after being powered on, but its output becomes stable after 30 minutes of preheating. 5. If an abnormality is found during use, turn off the power, stop using the product, and inspect it, or contact our technical department directly. 6. During transportation and storage, restore the original packaging and store the product in a cool, dry, and well-ventilated warehouse. 7. The quality warranty period is 12 months. Damage caused by improper use, such as pressure overload or incorrect wiring, is not covered by the quality warranty. 8. Special products are customized products and are not eligible for return without reason within 7 days. Customized products have a lead time and cannot be returned or exchanged.