Liquid level differential pressure transmitter

A liquid level differential pressure transmitter is a remote transmission device installed on a pipeline or container to sense the measured pressure. The pressure is transmitted to the transmitter body through a capillary filled with silicone oil (or other liquid), and then converted into a 4-20mA.DC signal output by the delta chamber and amplification circuit board inside the transmitter body (see structural schematic).

Liquid level differential pressure transmitterintroduce

The combination of a single flange pressure transmitter and an intelligent amplification plate can form an intelligent remote pressure transmitter, which can communicate with a handheld device that complies with the HART protocol for setting and monitoring.
In order to meet different installation requirements, this series of transmitters has multiple forms of remote transmission devices for users to choose from, and the main structure of the transmitter is the same as that of a pressure transmitter.

Liquid level differential pressure transmittercharacteristic

1. Simulate "online operation" assessment for each transmitter to ensure stable and reliable operation under extreme environmental temperature, medium temperature, and working pressure (including positive pressure or vacuum).
2. Adopting a "dynamic profile" remote transmission membrane structure, the membrane will not be damaged after overload; The accuracy will not change after long-term work.
3. The use of a full fusion welding and rigid sealing structure filling system has eliminated the occurrence of oil leakage.
4. A novel capillary coupling component is designed to provide reliable protection for the capillary, making it less prone to breakage during on-site use.
5. A variety of remote transmission devices in terms of variety, form, and size, as well as a rich variety of filling fluids, can meet the measurement needs of various occasions.
6. We can provide various special needs products, including high-temperature, high vacuum, fast response, and unequal long capillary (length ≤ 3 meters) remote transmission pressure transmitters.

Liquid level differential pressure transmitterTechnical Parameter

Output signal: 4-20mA.DC two-wire system (analog)
The two-wire 4-20mA DC signal is overlaid with a digital signal, and the user selects linear or square root output. (Intelligent)
Power supply: 12-45V.DC (see load characteristic diagram for details)
Load characteristics:
Power supply impact:<0.005% output range/V
Load impact: When the power supply is stable, there is no load impact.
Measurement accuracy: ± 0.1% and ± 0.2% of the calibration range
(The standard precision is ± 0.2%. If you choose other precision, please indicate it when ordering and selecting.)
Range ratio: 10:1 or 100:1
Damping: It is usually adjustable between 0.1 and 16 seconds, and the time constant increases when filled with inert fluid or with a remote transmission device.
Start time:<2 seconds, no preheating required
Working environment: ambient temperature -29~93 ℃ (analog amplifier)
-29~75 ℃ (digital/smart amplifier)
-29-65 ℃ (with display header)
Environmental humidity: 0-95%
Protection feature: IP65 protection capability
Explosion proof type: Explosion proof Exd II BT4-6
Intrinsically safe Exia II CT5
Static pressure influence: Zero position error: ± 0.5% maximum range limit, calibrated by zeroing for 32MPa under pipeline pressure.
Electromagnetic radiation impact: 0.05% maximum range value, accepted radiation frequency of 27-500MHz, test field strength of 3V/m.
Indicator (%): LCD digital display accuracy ± 0.2%
Vibration effect: ± 0.05%/g when vibrating at 200Hz in any direction.
Installation position: The diaphragm is not installed vertically, which may result in a zero point error of less than 0.24KPa, but it can be corrected by adjusting the zero point.
Weight: 3.9Kg (excluding accessories)
Note: The working pressure of a single flange pressure transmitter also depends on the specifications of the selected flange.
② The working temperature of the remote transmission device is determined by the type of filling fluid selected.
③ A single flange pressure transmitter refers to the output change caused by the temperature effect on one side of the remote transmission device.
④ The effects of static pressure and temperature were measured at the maximum range.
⑤ The length of the capillary tube on one side of the GP type single flange pressure transmitter is generally 1.5 meters, and the longest should not exceed 3 meters (agreed upon in special circumstances).

Liquid level differential pressure transmittermodel selection