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 and 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 applies 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 extremely high cost performance and has thus become a mainstream product in the transmitter market.

This intelligent pressure/differential pressure/level transmitter features a novel design concept, a complete range of types and specifications, easy installation and use, and safety explosion-proof performance. It is especially well known for high accuracy, compact size, light weight, convenient adjustment, excellent 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 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 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 reaches 0.1 class, with a turndown ratio better than 40：1;

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

·Supports both remote and local adjustment of span and zero point;

·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 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 medium, explosion-proof housing structure;

·Industry-proven superiority and reliability.

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: within 1.0%~100% of 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 may 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 resistor 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, the upper and lower range limits shall not 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℃

    　    operating temperature of the whole 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 between 3.45kPa（absolute pressure） and 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 span,

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

                for 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/span）% span,

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

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

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

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

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

　 Span error: the error for ranges 4, 5, 6, 7, and 8 is -1±0.25%/6.89MPa of the maximum span range, and the error for range 3 is -1.5±0.25%. This is a system error and may be eliminated by calibrating according to the actual static pressure before installation.

    Power supply effect: less than 0.005%/V of the 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 region.

    Installation position effect: a zero position error not greater than 0.25 kPa may be generated, 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 joint: 316 stainless steel, Hastelloy C, Monel;

        “O” ring（in contact with the measured medium）: fluororubber, nitrile rubber, ethylene-propylene;

　　  Filling liquid: silicone oil;

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

        Electrical housing: low-copper aluminum alloy;

        Coating: epoxy resin;

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

　　　　　　　　　  joint 1/2-14NPT or M20X1.5 male thread; when using a ball cone sealing joint, the center spacing 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. Its main products include Swiss metallux ceramic piezoresistive sensors and 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 liquid 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, ultrasonic level gauges

Precautions 1. All supplied products are provided with a product certificate and instruction manual, including product number, technical parameters, wiring, date of manufacture, etc. Please carefully verify them 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 operate 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 quality warranty）.8. Special products are customized products, do not participate in 7-day no-reason returns, custom-made products have a lead time, and are non-returnable and non-exchangeable.