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

The intelligent pressure/differential pressure/level transmitter is a new-generation intelligent transmitter manufactured using a sensor core produced with ROSEMOUNT technology, combined with the 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. This product offers an extremely high cost-performance ratio and has therefore become a mainstream product in the transmitter market.

This intelligent pressure/differential pressure/level transmitter features a novel design principle, a complete range of models and specifications, easy installation and use, safety, and explosion protection. It is especially renowned for high accuracy, small size, light weight, convenient adjustment, good long-term stability, strong one-way overload protection capability, and suitability for use in harsh environments. Therefore, it enjoys a very high reputation in domestic and international markets. This series of 0.1-grade capacitive intelligent transmitters 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, petrochemicals, and instrument processing, and complies with the IEC standard requirements implemented 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 a turndown ratio better than 40：1;

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

·Both remote and local span and zero point are adjustable;

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

·The sensor includes 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 parts in contact with the medium, explosion-proof housing structure;

·Industry-proven superiority and reliability.

Performance Parameters

Technical Performance

Applicable media: liquid, gas, or steam

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

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

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

Installation in hazardous locations: flameproof Exd Ⅱ CT6；

                intrinsically safe Exia Ⅱ CT6；

Load characteristics: after positive or negative migration, the upper and lower limits of the range shall not exceed the range limits. At the minimum range, the maximum positive migration is 0.975URL; the maximum negative migration is -URL. Under square root output, positive and negative migration can be adjusted and calibrated to 10% of the flow range.

Temperature range: medium temperature　　　　-40～100℃

  　      storage temperature　　　　-40～100℃

    　    ambient operating temperature　　-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 operating pressure should be between 3.45kPa（absolute pressure）and the upper range limit of the transmitter.

Volume change: less than 0.16cm3

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

Startup time: 3s, no preheating required.

Performance indicators:

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

    Turndown ratio: 40：1

    Accuracy: for ranges 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,

                for ranges 6, 7, 8

                      when the turndown 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: six-month error is ±0.15% of the maximum range;

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

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

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

　　　 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.

    Static pressure effect: under 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: the error for ranges 4, 5, 6, 7, and 8 is -1±0.25%/6.89MPa of the maximum range, and the error for range 3 is -1.5±0.25% of the maximum range. This is a system error and can be eliminated by calibration 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.

    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 zone.

    Mounting position effect: may generate a zero shift error of no more than 0.25 kPa, but it can be corrected, with no effect on the range;

The measuring body rotating relative to the flange has no effect.

    Electromagnetic radiation: compliant with IEC801 standard

Appearance Structure

 Structural materials:

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

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

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

　　  Fill fluid: silicone oil;

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

        Electrical housing: low-copper aluminum alloy;

        Coating: polyurethane epoxy resin;

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

　　　　　　　  connector 1/2-14NPT or M20X1.5 male thread; with ball-cone sealing and connector, 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, integrated/split level transmitters, anti-corrosion level transmitters, lightning-protected 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, date of manufacture, etc. Please check carefully to avoid incorrect use. 2. Wiring should be carried out strictly in accordance with our company's instructions for use. 3. This product is a precision instrument. Arbitrary disassembly, collision, dropping, or poking the sensor with sharp tools is prohibited. 4. The transmitter can work immediately after power-on, but the output becomes stable after preheating for 30 minutes. 5. If any abnormality is found during use, turn off the power supply, stop using it, inspect it, or directly contact our company's technical department. 6. During transportation and storage, restore the original packaging and store it 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 warranty）. 8. Special products are customized products and do not participate in 7-day no-reason return; customized products have a lead time and are non-returnable and non-exchangeable.