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Capacitive Remote Differential Pressure Transmitter

Capacitive differential pressure transmitter is a new type of transmitter that is imported from foreign advanced technology and equipment. The key raw materials, components and parts are imported from the factory. The whole machine has been strictly assembled and tested. It has advanced design principles and complete specifications. , easy to install and use. Because the model is completely integrated with the structural advantages of the two most popular and widely used transmitters in the country (Rosemount 3051 and Yokogawa EJA), the user has a refreshing feeling, while at the same time with the traditional 1151 CECC and other series of products can be directly replaced in the installation, with strong versatility and replacement capabilities.
Product Details:


Capacitive remote differential pressure transmitter


Capacitive differential pressure transmitter is a new type of transmitter that is imported from foreign advanced technology and equipment. The key raw materials, components and parts are imported from the factory. The whole machine has been strictly assembled and tested. It has advanced design principles and complete specifications. , easy to install and use. Because the model is completely integrated with the structural advantages of the two most popular and widely used transmitters in the country (Rosemount 3051 and Yokogawa EJA), the user has a refreshing feeling, while at the same time with the traditional 1151 CECC and other series of products can be directly replaced in the installation, with strong versatility and replacement capabilities. In order to meet the continuous improvement and development of domestic automation level, the capacitive differential pressure transmitter is designed to be small and exquisite, and it also introduces intelligent functions with HART fieldbus protocol. Super measurement performance for pressure, differential pressure, level, flow measurement.

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Working principle 

The process pressure is transmitted to the center of the delta chamber through the isolating diaphragm on both sides or one side and the filling liquid. The central diaphragm is a tensioned elastic element, which corresponds to the pressure difference on both sides acting thereon. Deformation displacement, the displacement is proportional to the differential pressure, the maximum displacement is about 0.1mm, this displacement is converted into the differential capacitance formed on the capacitor plate, and the differential capacitance is converted into a two-wire 4~20mA DC output signal by the electronic circuit. .

Function parameter 

Use objects: liquid, gas and steam

Measuring range: 0-0.16kpa to 0-40Mpa

Output signal: 4~20mA DC (specially available for four-wire 220V AC, 0~10mA DC output)

Power supply: 12~45V DC, generally 24V DC

Load characteristics: related to the power supply, the relationship between the load impedance RL and the power supply voltage VS is RL ≤ 50 (VS-12)

Indicator: Pointer linear indication 0~100% linear scale and square root indicate 0~100% flow scale, and 31/2 digit LCD display (0~100% linear)

Explosion-proof: 

a. Flameproof type EX d II BT5 Explosion-proof certificate number GYB 02532

b. Intrinsically safe EX ia CT6 explosion-proof certificate number GYB 02533

Range and zero point: external continuously adjustable

Positive and negative migration: After the zero point is migrated by the positive migration name, the absolute value of the range and the upper and lower limits of the measurement range cannot exceed 100% of the upper limit of the measurement range. The maximum positive migration is 500% of the minimum calibration range; the maximum negative migration is 600% of the minimum calibration range.

The maximum positive and negative migration of the flow transmitter is 10% of the calibration flow range.

Temperature range: Amplifier operating temperature range: -29~+93°C CECL type: -25~70°C Explosion-proof type: -20+60°C

With LCD display: +20~+70°C

Measuring components filled with silicone oil: +40~! +104°C

When flanged transmitter is filled with high temperature silicone oil: +15~+315°C, ordinary silicon reservoir: -40~+150°C

Static pressure and overload pressure: 4, 10, 25, 32Mpa

Humidity: relative humidity is 0 to 100%

Volumetric absorption: <0.16cm3

Damping (step response) when filled with silicone oil, generally adjustable between 0.2s and 1.67s

Start-up time: 2s, no need to warm up

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Technical data 

(without migration, under standard operating conditions, silicone oil, 316L stainless steel isolation diaphragm)

Accuracy rating: ±0.2%, ±0.25%, ±0.5%

Dead zone: none (≤0.1%)

Stability: no more than the accuracy of the transmitter within twelve months

Temperature effect (quantity range):

Range code accuracy level

0.2, 0.25 level 0.5

1-≤0.54%/10°C

2≤0.364%/10°C≤0.5%/10°C

3~9≤0.18%/10°C≤0.3%/10°C

2(CECL)≤0.46%/10°C≤0.6%/10°C

3, 4, 5 (CECL) ≤ 0.28% / 10 ° C ≤ 0.4% / 10 ° C

3, 4, 5 (CECU) ≤ 0.28% / 10 ° C ≤ 0.4% / 10 ° C

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Static pressure effect (maximum range):

Range code accuracy level

0.2 level 0.25 level 0.5 level

1 (fine differential pressure) - ≤ 1%

2, 5, 6, 7 ≤ 0.4% ≤ 0.5% ≤ 0.7%

3, 4 ≤ 0.25% ≤ 0.3% ≤ 0.5%

3, 4, 5, 6 (high static pressure) - ≤ 2% ≤ 2.2%


Vibration effect: In any axial direction, the vibration frequency is 200HZ. The error is ±0.05%/g of the upper limit of the measurement range

Power supply impact: less than 0.005%/V of the output range

Load impact: if the power supply is stable, the load has no effect

Installation position effect: The maximum zero error of 0.24kpa can be generated, but it can be corrected and has no effect on the range.

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Structural materials: 

Isolation diaphragm: 316 stainless steel, Hastelloy C-276, Monel

Flanges and fittings: carbon steel nickel plated, 316 stainless steel, Hastelloy C or Monel

Contact medium: "O" ring: nitrile rubber, * rubber

Filling liquid: silicone oil or inert oil

Bolt: carbon steel nickel plating

Electronic shell material: low copper aluminum alloy, shell protection grade: IP65

Piping connection: flange NPT1/4, center distance 54mm; joint NPT1/2 or M20x1.5 male thread ball cone seal, center distance 50.8, 54, 57.2mm with joint (NPT taper pipe thread conforms to GB/T12716 -91)

Signal line connection hole: G1/2"

Weight: about 5.4kg (without accessories)


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