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 uses a direct digital capacitance circuit to replace the analog signal amplification circuit and A/D conversion circuit, and employs digital compensation technology to compensate for temperature and static pressure, thereby improving measurement accuracy and reducing temperature drift. The transmitter features a compact size, high reliability, and excellent long-term stability. This product offers an extremely high cost-performance ratio, making it 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 safety explosion-proof performance. It is especially renowned for high accuracy, compact size, light weight, convenient adjustment, excellent 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 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 promoted in China.

Product Features

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

·Strong self-diagnosis 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 adjustments are available;

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

·The sensor has 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 parts are universal, and interchange between the sensor and electronic circuit board does not affect transmitter performance, making maintenance more convenient;

·Optional diaphragm materials for contact with the measured 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 change between 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: externally supplied 24V DC, （power supply range 14.5V~45V）

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

Installation in hazardous locations: 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 shall 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, the positive and negative migration can be adjusted 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 within 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 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）% of 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）% of range,

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

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

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

　 Range error: the error for ranges 4、5、6、7、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, which 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.

    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 offset error not greater than 0.25 kPa may be generated at most, 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: compliant with IEC801 standard

Outline Structure

 Structural materials:

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

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

        “O” ring（in contact with the 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: epoxy resin;

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

　　　　　　　  Joint 1/2-14NPT or M20X1.5 male thread; when using ball-cone sealing with joint, the center distance is 50.8, 54, 57.2mm;

        Weight:   3.5kg（excluding options）

Since its establishment, Xi'an Shenghong Chuang Instrument Co., Ltd. has mainly been 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, independently 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, thermocouples/RTDs, temperature transmitters, and ultrasonic level meters

Precautions 1.All supplied products are provided with a product certificate and instruction manual, including product number, technical parameters, wiring, ex-factory date, etc. Please check carefully to avoid incorrect use.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 30 minutes of preheating.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 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 the 7-day no-reason return policy, have a customization lead time, and are non-returnable and non-exchangeable.