Double-Flange Differential Pressure Transmitter

The double-flange differential pressure transmitter is a new type of transmitter with advanced design principles, complete specifications and easy installation and use. The appearance is completely integrated with the structural advantages of the two most popular and widely used transmitters in the country (Rosemount 3051 and Yokogawa EJA), giving users a refreshing feeling, while also with the traditional 1151, CECC and other series. The equipment can be directly replaced on the installation, with strong versatility and replacement ability. In order to meet the continuous improvement and development of domestic automation level, the double-flange differential pressure transmitter has introduced the intelligent function with HART fieldbus protocol in addition to the compact design.

  ●High precision;

  ●Good stability;

  ●Two-wire system;

  ● Solid components, plug-in printed circuit boards;

  ●Small, lightweight, and strong anti-vibration;

  ●The range and zero point are continuously adjustable outside;

  ● Positive migration can reach 500%; negative migration can reach 600%;

  ● Damping adjustable;

  ● One-way overload protection features are good;

  ●No mechanical moving parts, less maintenance work;

  ●All series of unified structure, strong interchangeability of parts;

  ●The diaphragm material of the contact medium can be selected as: (316L, TAN, HAST-C, MONEL and other corrosion resistant materials)

  ● Explosion-proof structure, used all day.

  ◆Use of objects: liquid, gas and steam

  ◆Measurement range: 0-0.1kPa 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 load capacity at a certain power supply voltage is shown in Figure 2. The relationship between the load impedance RL and the power supply voltage VS is RL ≤ 50 (VS-12).

  ◆Indication table: pointer type linear indication 0~100% scale, and 3 1/2 digit LCD liquid crystal display

  ◆Explosion-proof: a. Flameproof type dIICT5; b. Intrinsically safe type iaIICT6

  ◆ Range and zero point: external continuously adjustable

  ◆ Positive and negative migration: After the zero point passes the positive or negative migration, the absolute value of the upper limit and lower limit of the measuring range and the measuring range cannot exceed 100% of the upper limit of the measuring 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 range.

  ◆ Temperature range: Amplifier operating temperature range: -29~+93°C (LT type: -25~+70°C), measuring component for filling silicone oil: -40~+104°C, flanged transmitter filling High temperature silicone oil: +15~+315°C, ordinary silicone oil: -40~+150°C

  ◆Static pressure and overload pressure: 4, 10, 25, 32MPa

  ◆ Humidity: Relative humidity is 0~100%.

  ◆Vibration effect: In any axial direction, when 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 it has no effect on the range.

 ◆Isolation diaphragm: 316L stainless steel, Hastelloy C-276, Monel alloy, or tantalum

  ◆Exhaust/drain valve: 316 stainless steel, Hastelloy C, Monel

  ◆Flange and joint: carbon steel nickel plated, 316 stainless steel, Hastelloy C or Monel

  ◆Contact medium "O" ring: butyl nitrile rubber, fluoro rubber

  ◆ Filling liquid: silicone oil or inert oil

  ◆Bolt: carbon steel nickel plating

  ◆Electronic housing material: low copper aluminum alloy

  ◆Pressing connection: flange NPT 1/4, center distance 54mm; joint NPT 1/2 or M20×1.5 male thread ball cone seal, center distance 50.8, 54, 57.2mm with joint (NPT taper pipe thread meets GB/T12716-91)

  ◆Signal wire connection hole: G1/2〃

  ◆ Weight: about 5.5kg (without accessories)

1, Must pay attention to whether the flange on the equipment is a standard flange, whether it is consistent with the flange of the double-flange differential pressure transmitter, because this affects the installation.

2. The low pressure side must be installed in the gas phase and the positive high pressure side in the liquid phase. Not the opposite.

3. The double-flange differential pressure transmitter can be installed on the low pressure side upper part or on the high pressure side lower part. As long as the proper migration according to the density and height of the measured liquid can ensure normal operation.

4, Must protect the capillary, it is best to use angle steel for support, and to ensure that the curvature can not be less than 45 degrees.

5. During the installation process, the double-flange differential pressure transmitter must ensure that each bolt is evenly stressed (diagonal fastening), so as to ensure the flatness of the flange surface and avoid the unevenness of the flange surface. Leak after driving.

6. If the double-flange differential pressure transmitter is used normally, it should not be easily disassembled, because it is easy to cause the sealing surface to be crushed or not tight, which leads to leakage.

7. For continuous measurement of liquid level For interface measurement, differential pressure type instrument can be used, but the total liquid level should always be higher than the upper pressure port.

8. For the liquid density change under normal working conditions, the differential pressure meter should not be used.

1 Installation site impact and vibration

Intelligent-differential pressure transmitters and pressure transmitters are designed to withstand certain shock and vibration. However, it should also be installed in a place where there is no vibration or vibration.

2 installation site ambient temperature conditions

Please try to avoid installing the transmitter in a place with large ambient temperature changes. If the installation location is directly exposed to heat radiation or exposed to the sun and rain, waterproof, heat radiation and ventilation measures should be taken.

3 installation site ambient air conditions

Please avoid installing in a corrosive environment. If it is used in a corrosive environment, it should be well ventilated and be careful to avoid corrosive gases or liquids from immersing in the conduit.

4 reference to the installation location

Double-flange differential pressure transmitters have strict requirements on the installation position. When there are tilting installation requirements, additional instructions must be made when ordering. You can also reset the zero point after installation.

The double-flange transmitter manufactured by Huaheng Instrument has advanced technology, convenient installation and use, high measurement accuracy, small maintenance and explosion-proof. It is widely used in petroleum, chemical, paper and pharmaceutical industries to detect the liquid level or fluid differential pressure and density of closed containers and storage tanks. Welcome to call us!