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 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. With an extremely high cost-performance ratio, this product has 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, convenient installation and use, and safe explosion-proof performance. It is particularly renowned for high accuracy, compact 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 international markets. This series of 0.1-class 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 "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 reaches 0.1 class, with a 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;

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

·Optional diaphragm materials for media-contact parts, 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 step 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 resistor 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 shift, the upper and lower range limits shall not exceed the range limits. 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 be adjusted 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: the time constant is adjustable between 0.2～32.0s.

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

Performance indicators:

    （Under standard test conditions with no shift, 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 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 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/range）% span,

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

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

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

　　　　     including the total error of span and zero point, it is ±0.5% of the 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.

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

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

    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: the maximum zero position 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: 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 zinc-plated、1Cr18Ni9、0Cr17Ni4CuNb、42CrMo;

        Electrical housing: low-copper aluminum alloy;

        Coating: polyester epoxy resin;

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

　　　　　　　   Fitting 1/2-14NPT or M20X1.5 male thread; when using ball-cone sealing with fitting, 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 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-proof level transmitters, high-temperature guided-pressure level transmitters, straight 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 product certificates and instruction manuals, including product serial numbers, technical parameters, wiring, factory date, etc. Please carefully check them to avoid misuse.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 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 wiring errors is not covered by the quality warranty）.8.Special products are customized products, do not participate in the 7-day no-reason return policy, have a delivery lead time, and are non-returnable and non-exchangeable.