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

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

This intelligent pressure/differential pressure/level transmitter features a novel design principle, a complete range of types and specifications, convenient installation and use, and safety explosion-proof performance. It is especially renowned for high accuracy, compact size, light weight, easy adjustment, good long-term stability, strong one-way overload protection capability, and suitability for use in harsh environments. Therefore, it enjoys a high reputation in both domestic and international markets. This 0.1-grade capacitive intelligent transmitter series includes multiple types such as pressure, differential pressure, absolute pressure, remote transmission, and level, and is equipped with corresponding optional products. It can be widely used in industries such as electric power, metallurgy, petrochemical, and instrument processing, and complies with the requirements of the “IEC” standards promoted in China.

Product Features

·The use of a microprocessor provides greater flexibility and enhanced functions;

·Strong self-diagnostic capability;

·Wide measuring range coverage: 0～0.2kPa…10MPa;

·Accuracy up to 0.1 grade, with turndown ratio better than 40：1;

·Zero point and span adjustment do not affect each other;

·Supports both remote and local adjustment of range and zero point;

·Two-wire system, compliant with HART protocol, enabling digital communication with ROSEMOUNT275 and MS-H376 handheld communicators without interrupting analog output;

·Sensor with built-in non-volatile memory;

·Good stability, high accuracy, adjustable damping, and strong resistance to one-way overload;

·No mechanical transmission parts, low maintenance workload, sturdy and vibration-resistant;

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

·Optional diaphragm materials for wetted parts, explosion-proof housing structure;

·Industry-proven superiority and reliability.

Performance Parameters

Technical Performance

Applicable media: liquid, gas, or steam

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 with superimposed HART protocol digital signal（two-wire system）；

Square root output: when the input pressure is between 1.0%~100%, the output has a square root relationship with differential pressure; between 0%~0.1%, the output has a segmented linear relationship with differential pressure; there is no sudden jump between 4~20mADC output, with superimposed HART? protocol digital signal (two-wire system), and users may choose linear output or square root output according to on-site conditions.

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

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

Installation in hazardous areas: flameproof type Exd Ⅱ CT6；

               intrinsically safe type Exia Ⅱ CT6；

Load characteristics: After positive and negative migration, the upper and lower range limits shall not exceed the range limits. At the minimum range, the maximum positive migration is 0.975URL; the maximum negative migration is -URL. During square root output, positive and negative migration can calibrate 10% of the flow range.

Temperature range: medium temperature　　-40～100℃

  　      storage temperature　　-40～100℃

    　    operating temperature of the complete unit　　-40～85℃

Relative humidity: 0～100%

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

Volume change: less than 0.16cm3

Damping: time constant adjustable between 0.2～32.0s.

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

Performance indicators:

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

    Range ratio: 40：1

    Accuracy: Range 3, 4, 5

　　　             When the turndown ratio is 1：1 to 10：1, it is ±0.1% of the calibrated range,

                      when the turndown ratio is 10：1 to 40：1, it is ±0.05（1+0.1URL/range）% range,

                Range 6, 7, 8

                      when the range ratio is 1：1 to 10：1, it is ±0.15% of the calibrated range,

                      when the turndown ratio is 10：1 to 40：1, it is ±0.075（1+0.1URL/range）% range,

    Stability: the error over six months is ±0.15% of the maximum range;

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

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

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

　　　　Note: for Range 3, the temperature error should be doubled.

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

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

　 Range error: the error of Ranges 4, 5, 6, 7, and 8 is -1±0.25%/6.89MPa of the maximum range span, and the error of Range 3 is -1.5±0.25%. This is a systematic error and can be eliminated by calibrating according to the actual static pressure before installation.

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

    Vibration effect: on any axis, at a frequency of 200Hz, the induced error is ±0.05%/g of the maximum range span.

    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: a zero shift error no greater than 0.25 kPa may be generated, but it 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 IEC801 standard

Appearance and Structure

 Structural materials:

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

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

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

　　  Filling liquid: silicone oil;

　　  Bolts: carbon steel zinc-plated, 1Cr18Ni9, 0Cr17Ni4CuNb, 42CrMo;

        Electrical housing: low-copper aluminum alloy;

        Coating: epoxy resin;

        Pressure connection fitting: for Ranges 3, 4, and 5, the center hole distance of the threaded two-flange connection 1/4-18NPT is 54mm;

　　　　　　　　  Joint 1/2-14NPT or M20X1.5 male thread; when equipped with conical sealing joint, the center distance is 50.8, 54, 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 and self-developed ceramic capacitive pressure sensors. Diffused silicon, ceramic piezoresistive, strain gauge, metal capacitive, ceramic capacitive pressure transmitters, remote pressure transmitters, high-temperature pressure transmitters, flush diaphragm pressure transmitters, anti-corrosion pressure transmitters, integral/split level transmitters, anti-corrosion level transmitters, lightning protection level transmitters, high-temperature guided pressure level transmitters, rigid rod level transmitters, flange level transmitters, air pressure transmitters, metal capacitive differential pressure transmitters, diffused silicon differential pressure transmitters, pressure controllers, thermocouple/RTD temperature transmitters, ultrasonic level gauges

Notes 1. All supplied products are provided with a product certificate and instruction manual, including product number, technical parameters, wiring, ex-factory date, etc. Please carefully verify them to avoid misuse. 2. Wiring shall be carried out strictly in accordance with our company's instructions for use. 3. This product is a precision instrument; random disassembly, collision, dropping, and touching the sensor with sharp tools are prohibited. 4. The transmitter can operate immediately after power-on, but the output becomes stable after preheating for 30 minutes. 5. If any abnormality is found during use, the power supply should be turned off, use should be stopped, and inspection should be carried out, or contact our company's technical department directly. 6. During transportation and storage, restore the original packaging and store in a cool, dry, and 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, do not participate in 7-day no-reason return, customization has a delivery period, and no return or exchange is accepted.