The capacitive intelligent pressure/differential pressure/level transmitter is a high-precision intelligent instrument product independently researched, designed, and 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 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 extremely high cost performance and has therefore 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, easy 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 overseas markets. This series of Class 0.1 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 “IEC” standard requirements 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 Class 0.1, 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 HART protocol, capable of digital communication with ROSEMOUNT275 and MS-H376 handheld communicators without interrupting analog output;

·Built-in non-volatile memory in the sensor;

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

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

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

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

·Proven superiority and reliability in the industry.

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: between 1.0%~100% input pressure, 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 within 4~20mADC output, superimposed with HART? protocol digital signal (two-wire system), and users can 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: the maximum allowable load resistance in the load resistance 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 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. 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 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 operating pressure should be from 3.45kPa（absolute pressure）to the upper range limit of the transmitter.

Volume change: less than 0.16cm3

Damping: time constant adjustable between 0.2～32.0s.

Startup time: 3s, no preheating required.

Performance Indexes:

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

    Turndown ratio: 40：1

    Accuracy: 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/span）% span,

                ranges 6, 7, 8

                      when the turndown 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/span）% span,

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

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

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

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

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

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

    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 maximum span range, and the zero error of ranges 3, 6, 7, and 8 is ±0.5% of maximum span range.

　 Span error: the error of ranges 4, 5, 6, 7, and 8 is -1±0.25%/6.89MPa of maximum span range, and the error of range 3 is -1.5±0.25%. 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 output span

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

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

    Installation position effect: can generate a zero shift error of no more than 0.25 kPa, but it can be corrected and has no effect on span;

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

    Electromagnetic radiation: complies 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: zinc-plated carbon steel, 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 two-flange connection thread 1/4-18NPT is 54mm;

　　　　　　  Connector 1/2-14NPT or M20X1.5 male thread; when equipped with ball cone sealing connector, the center distances are 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. 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, integrated/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, and ultrasonic level meters.

Precautions 1.All supplied products are provided with product certificates and instruction manuals, including product number, technical parameters, wiring, date of manufacture, etc. Please check carefully 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. Arbitrary disassembly, collision, dropping, and poking the sensor with sharp tools are prohibited.4.The transmitter can operate immediately after power-on, but the output becomes stable after 30 minutes of preheating.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 and incorrect wiring is not covered by the quality warranty）.8.Special products are customized products and do not participate in the 7-day no-reason return policy. Customized products have a delivery lead time and are non-returnable and non-exchangeable.