The capacitive intelligent pressure/differential pressure/level transmitter is a high-precision intelligent instrument product independently researched, developed, and manufactured 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 produced using a sensor core manufactured 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 its extremely high cost performance, this product has become a mainstream product in the transmitter market.

This intelligent pressure/differential pressure/level transmitter features a novel design principle, complete varieties and specifications, convenient installation and use, and safety explosion-proof performance. 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, 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 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, capable of digital communication with ROSEMOUNT275 and MS-H376 handheld communicators without interrupting analog output;

·Non-volatile memory built into the sensor;

·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 between sensor and electronic circuit board does not affect transmitter performance, making maintenance more convenient;

·Optional diaphragm materials for contact with the medium, 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 superimposed with 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 jump in output between 4~20mADC, superimposed with HART? protocol digital signal(two-wire system), and users may select linear output or square root output according to on-site conditions.

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

Load characteristics: maximum permissible load resistance in the load resistance loop 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 limits of the range must not exceed the limits of the measuring range. 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 be adjusted and calibrated to 10% of the flow range.

Temperature range: medium temperature　　　 -40～100℃

  　      storage temperature　　　 -40～100℃

    　    complete unit 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 from 3.45kPa（absolute pressure）to the upper limit of the transmitter range.

Volume change: less than 0.16cm3

Damping: time constant 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 conditions.）

    Range ratio: 40：1

    Accuracy: for ranges 3, 4, 5

　　　              when the turndown ratio is 1：1 to 10：1, it is ±0.1% of calibrated span,

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

                for ranges 6, 7, 8

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

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

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

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

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

　　　　　　    total error including span and zero point is ±0.5% of 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 for ranges 4 and 5 is ±0.25% of the maximum range span, and the zero error for ranges 3, 6, 7, and 8 is ±0.5% of the maximum range span.

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

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

    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: may produce a zero shift error not greater than 0.25 kPa, but it can be corrected, with no effect on the span;

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

    Electromagnetic radiation: complies with IEC801 standard

External Structure

 Structural materials:

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

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

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

　　  Filling liquid: silicone oil;

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

        Electrical housing: low-copper aluminum alloy;

        Coating: polyurethane epoxy resin;

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

　　　　　　　　  Fitting 1/2-14NPT or M20X1.5 male thread; with ball-cone sealing and fitting, the center spacing 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, 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, thermocouples/RTDs, temperature transmitters, and ultrasonic level gauges

Notes 1.All supplied products are accompanied by a product certificate and instruction manual, including product number, technical parameters, wiring, date of manufacture, etc. Please check carefully to avoid misuse.2.Wiring must be carried out strictly in accordance with our company's instructions for use.3.This product is a precision instrument. Random 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, 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, do not participate in 7-day no-reason return, customized products have a delivery lead time, and are non-returnable and non-exchangeable.