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 of intelligent transmitter produced by adopting a sensor core manufactured with ROSEMOUNT technology and integrating the advanced digital technology developed by our company. In principle, it uses a direct digital capacitance circuit to replace the analog signal amplification circuit and A/D conversion circuit, and applies 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 thus 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 operation, and safe explosion-proof performance. It is especially well known 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 both domestic and international markets. This series of 0.1 grade capacitive intelligent transmitters includes pressure, differential pressure, absolute pressure, remote transmission, level, and many other types, 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 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 adjustments 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 a non-volatile memory;

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

·Optional diaphragm materials for contact media, explosion-proof housing structure;

·Superior performance and reliability proven by the industry.

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: between 1.0%~100% of 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 the 4~20mADC output, superimposed with HART? protocol digital signal(two-wire system), and users can 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 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 shift, the upper and lower limits of the range shall not exceed the limits of the range. At the minimum range, the maximum positive shift is 0.975URL; the maximum negative shift is -URL. During square root output, the positive and negative shift can calibrate 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: the time constant is adjustable between 0.2～32.0s.

Startup time: 3s, no preheating required.

Performance indicators:

    （Under standard test conditions with no shift, 316 stainless steel isolation diaphragm, and other standard 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 the calibrated span,

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

                ranges 6, 7, 8

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

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

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

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

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

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

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

    Overpressure effect: after applying pressure of 140kgf/cm2, the error is ±0.25% of the 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 the maximum span range, and the zero error of ranges 3, 6, 7, and 8 is ±0.5% of the maximum span range.

　 Span error: the errors of ranges 4, 5, 6, 7, and 8 are -1±0.25% of the maximum span range/6.89MPa, and the error of 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 resulting error is ±0.05%/g of the 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 area.

    Installation position effect: a zero position error not greater than 0.25 kPa may be generated at most, but it can be corrected and has no effect on the span;

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 the measuring medium）: fluororubber, nitrile rubber, ethylene-propylene;

　　  Filling liquid: silicone oil;

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

        Electrical housing: low-copper aluminum alloy;

        Coating: epoxy resin;

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

　　　　　　　　 Joint 1/2-14NPT or M20X1.5 male thread; when using a ball cone 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 been 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, integrated/split level transmitters, anti-corrosion level transmitters, lightning-proof 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 numbers, technical parameters, wiring, factory date, 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. Random disassembly, collision, dropping, and probing the sensor with sharp tools are prohibited.4.The transmitter can work immediately after power-on, but the output will be 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 it in a cool, dry, and ventilated warehouse.7.The quality guarantee period is 12 months（damage caused by improper use such as pressure overload and wiring errors is not covered by the quality guarantee）.8.Special products are customized products, do not participate in 7-day no-reason return, customized products have delivery lead times, and are non-returnable and non-exchangeable.