Record My Romantic Life AL1151 3351DP GP Type Double Flange Differential Pressure Level Gauge (Double Flange Differential Pressure Transmitter) is used to measure the liquid level of the medium with the working pressure of the system, and at the same time, in order to prevent the medium in the pipeline from directly entering the pressure sensor assembly in the converter, the double flange level transmitter load measuring flange and the converter are connected by a capillary filled with silicone oil and other substancesThe double flange level transmitter is not only suitable for measuring the level of clean liquid media, but also for measuring the level of easily crystallized, containing solid impurities and condensed media, the double flange level transmitter is mainly used to measure the level and flow rate of liquid, gas or vapor of liquid, and converts the measured differential pressure signal into 4 20mA DC signal output. 
The double flange differential pressure level gauge is to measure the liquid level after the differential pressure transmitter is equipped with a remote sealing device, and it still has the various characteristics of the differential pressure transmitter, and can communicate with the HART hand communicator to set and monitor through it.
1. Applicability of double flange differential pressure level gauge:
Direct contact between the medium to be measured and the separator diaphragm of the transmitter is avoided and is suitable for the following situations:
1. The measured medium has a corrosive effect on the sensitive components of the transmitter.
2. It is necessary to isolate the high-temperature measured medium from the transmitter.
3. There are solid suspended solids or high-viscosity media in the measured medium.
4. The measured medium is easy to solidify or crystallize at the same time as the impulse tube is introduced.
5. The measuring head should be strictly purified to replace the measured medium
6. The measuring head must be kept hygienic and pollution is strictly prohibited. Intended for: Corrosive or viscous liquids.
Note: Remote transmitters should not be used in high vacuum occasions.
7. Explosion-proof grade of the host: EXDIICT6 dust explosion-proof explosion-proof certificate number: CNEX211023x
2. The structural type of double flange differential pressure level gauge for measuring liquid level differential pressure:
1) When some media are led out with an insulated impulse tube and still want to crystallize, a double flange differential pressure transmitter can be used to measure. According to the severity of the crystallization of the medium, it can be used separately:
Flange structure type of double flange level transmitter.
a. Double flat flange type liquid level transmitter.
b. One flat and one inserted into the barrel flange level transmitter.
c. ** into the cylinder flange level transmitter measurement as shown in the figure
*Measurement diagram of the double flange differential pressure level gauge of the inlet type.
Due to the height difference between the two flanges, migration should be added when adjusting. The negative pressure remote flange is added with negative migration above, and the calculation method is as follows:
Range: p=r
Negative migration: b=r0h-rh0
In the formula, r - the specific gravity of the measured medium r0 - the specific gravity of silicone oil is 097g/cm3
Example: H=800mm, H0=250mm, H=1300mm, R=12g/cm3
Range: p=r·h=12×800=960mmh2o
Negative migration: b=r0h-rh0=097×1300-1.2×250=961≈960mmh20
The range should be adjusted to -960 0mmh20 before installation
2) Use a double flange differential pressure transmitter to measure the flow rate.
The medium that can not be drawn out by the impulse pipe, the double flange differential pressure transmitter can be used to measure the flow rate, and its device is shown in the figure below, when measuring the horizontal pipeline, the two flanges are on the same horizontal plane, there is no liquid level difference, and the migration is not considered, and the measurement of the vertical pipeline is, always bear the liquid level pressure difference of (r-r0)h, so the instrument should have (r-r0)h positive migration.
3. There are four forms of remote transmission device for double flange differential pressure level gauge:
PFW flat remote transmission device (standard 3, working pressure 2.)5mpa）
RTW thread-mounted remote transmission device (maximum working pressure 10MPa).
RFW flange mounted remote transmission device.
EFW type insertion cartridge remote transmission device (standard 3 or 4 working pressure 2.)5mpa）