Price of intelligent diaphragm differential pressure transmitter

Price of intelligent diaphragm differential pressure transmitter

Super measurement performance, used for pressure, differential pressure, liquid level, and flow measurement

● Digital accuracy:+(-) 0.05%

Simulation accuracy:+(-) 0.75%+(-) 0.1% F.S

● Full performance:+(-) 0.25F.S

Stability: 0.25% for 60 months

Range ratio: 100:1

Measurement rate: 0.2S

● Miniature (2.4kg) all stainless steel flange, easy to install

● Process connection is compatible with other products to achieve measurement

The world's * sensor (technology) using H-alloy sheath has achieved excellent cold and hot stability

Intelligent transmitter using 16 bit computer

Standard 4-20mA DC with digital signal based on HART protocol, remote control

● Support upgrades to fieldbus and field control based technologies.

Price of intelligent diaphragm differential pressure transmitter

Introduction

Differential pressure transmitter is used to prevent the medium in the pipeline from directly entering the transmitter. The pressure sensing diaphragm is connected to the transmitter by a capillary tube filled with fluid. It is used to measure the liquid level, flow rate, and pressure of liquids, gases, or vapors, and then convert them into 4-20mA DC signal output. The cover of the picture shows the 3051 differential pressure transmitter from a domestic brand.

Differential pressure transmitters are suitable for the following measurement and control situations：

● Viscous media at high temperatures

● Medium that is prone to crystallization

● Sedimentation media with solid particles or suspended solids

● Strong corrosive or highly toxic media

Can eliminate the occurrence of pressure pipe leakage and pollution of the surrounding environment; It can avoid the tedious work of frequently replenishing isolation fluid due to the instability of measurement signals when using isolation fluid.

Continuous and precise measurement of interface and density

The remote transmission device can avoid the mixing of different instantaneous media, thus enabling the measurement results to truly reflect the actual situation of process changes.

Places with high hygiene and cleanliness requirements

In the production of food, beverage, and pharmaceutical industries, it is not only required that the contact area of the transmitter with the medium meet hygiene standards, but also be easy to rinse

Prevent cross contamination of different media.

principle

As the name suggests, the result measured by a differential pressure transmitter is the pressure difference, that is, △ P=ρ g △ h. Since oil tanks are often cylindrical, the area S of their cross-sectional circle remains constant. Therefore, gravity G=△ P · S=ρ g △ h · S, S remains constant, and G is proportional to △ P. As long as the Δ P value is accurately detected and proportional to the height Δ h, the pressure detected remains constant even when the volume of the oil expands or shrinks and the actual liquid level rises or falls during temperature changes. If the user needs to display the actual liquid level, medium temperature compensation can also be introduced to solve the problem.

Related parameters

Target audience: liquids, gases, and vapors

Measurement range: 0-0.1kPa to 0-40MPa

Output signal: 4-20mA DC (special for four wire 220V AC power supply, 0-10mA DC output)

Power supply: 12-45V DC, usually 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 load impedance RL and power supply voltage Vs is: RL ≤ 50 (Vs-12)

Indicator: pointer type linear indication 0~scale or LCD liquid crystal display.

Explosion proof: Explosion proof ExdIICT6

Range and zero point: externally continuously adjustable

Positive and negative transfer: The values of the upper and lower limits of the range and measurement range after the zero point undergoes positive or negative transfer,

All cannot exceed the upper limit of the measurement range. (Intelligent type: Range ratio 15:1) The maximum positive transfer is 500% of the minimum calibration range; The maximum negative transfer is 600% of the minimum calibration range.

Temperature range: The working temperature range of the amplifier is -29 to+93 ℃ (LT type is -25 to+70 ℃).

Measuring element filled with silicone oil: -40 to+104 ℃

When filling high-temperature silicone oil into flange type transmitters: -20~+315 ℃, ordinary silicone oil: -40~+149 ℃

Static pressure: 4, 10, 25, 32MPa

Humidity: Relative humidity is 5-95%

Volume suction capacity:<0.16cm³

Damping (step response): When filled with silicone oil, it is generally continuously adjustable between 0.2s and 1.67s.

Accuracy: ± 0.2%

Dead zone: None (≤ 0.1%)

Stability: Within six months (one year for intelligent models), the basic error value should not exceed the maximum range

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 is not affected.