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 transmitters produced using sensor cores 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. 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, complete varieties and specifications, convenient installation and use, safety, and explosion-proof performance. It is especially well known for high accuracy, small size, light weight, convenient adjustment, good long-term stability, strong unilateral 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 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 electric power, metallurgy, petrochemical, instrument processing, and other industries, and complies with the requirements of the “IEC” standards promoted in China.

Product Features

·Due to the use of a microprocessor, flexibility is increased and functions are enhanced;

·Equipped with strong self-diagnostic capability;

·Wide range coverage 0～0.2kPa…10MPa;

·Accuracy up to 0.1 grade, rangeability better than 40：1;

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

·Both remote and local range 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 is equipped with non-volatile memory;

·Good stability, high accuracy, adjustable damping, and strong resistance to unilateral overload;

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

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

·Optional diaphragm materials for parts in 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: 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 step change between 4~20mADC output, 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 supply, （power supply range 14.5V~45V）

Load characteristics: maximum allowable load resistance in the load resistance circuit 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 migration, neither the upper nor lower range limits may exceed the range limits. At the minimum range, the maximum positive migration is 0.975URL; the maximum negative migration is -URL. For 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: apply 0（absolute pressure）~13.76MPa pressure to either side of the transmitter, and the transmitter will not be damaged; 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: time constant adjustable between 0.2～32.0s.

Start-up time: 3s, no preheating required.

Performance index:

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

    Rangeability: 40：1

    Accuracy: ranges 3, 4, 5

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

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

                ranges 6, 7, 8

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

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

    Stability: 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 should be doubled.

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

    Static pressure effect: under 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 error of ranges 4, 5, 6, 7, and 8 is -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 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 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: the maximum zero error generated is not greater than 0.25 kPa, 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: compliant 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 measuring medium）: fluororubber, nitrile rubber, ethylene-propylene;

　　  Fill fluid: silicone oil;

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

        Electrical housing: low-copper aluminum alloy;

        Coating: polyester epoxy resin;

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

　　　　　　　　　  Joint 1/2-14NPT or M20X1.5 male thread; with ball-cone sealing and 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 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, 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, straight rod level transmitters, flange level transmitters, wind 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, 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, 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, the power supply should be turned off, use should be stopped, and inspection should be conducted, 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 quality warranty）.8.Special products are customized products, do not participate in 7-day no-reason return, customized products have a delivery lead time, no return and no exchange.