1、 Overview of flange remote pressure transmitter:

The flange remote transmission pressure transmitter is mainly used to prevent the medium in the pipeline from directly entering the pressure sensing component of the transmitter. The flange and transmitter are connected by a capillary tube filled with fluid. It can also communicate with a HART handheld device for setting and monitoring.

Viscous media that are prone to crystallization at high temperatures, sedimentary media with solid particles or suspended solids, and highly corrosive or 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. The continuous and precise measurement interface and density 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. In places with high hygiene and cleanliness requirements, such as food, beverage, and pharmaceutical industry production, not only is the contact area of the transmitter with the medium required to meet hygiene standards, but it should also be easy to rinse to prevent cross contamination of different batches of media.

2、 Usage of flange remote transmission pressure transmitter:

The flange remote transmission pressure transmitter can avoid direct contact between the measured medium and the isolation diaphragm of the transmitter. This measurement method is suitable for the following situations:

1. Isolate the high-temperature medium from the transmitter.

2. The tested medium has a corrosive effect on sensitive components.

3. Measure suspensions or high viscosity media, such as mud, pulp, etc.

4. The tested medium solidifies or crystallizes due to changes in environment or fluid temperature.

5. Replace the measured medium and strictly purify the measuring head, otherwise it will seriously affect the measurement results.

6. The measuring head must maintain hygienic conditions to prevent contamination.

3、 Product classification of flange remote transmission pressure transmitter

The connection between the flange remote transmission pressure transmitter and the measured medium equipment is

Threaded, flanged, and snap ring (for sanitary systems)

Flange type can be divided into flange type with lower sleeve and flat type

Remote transmission devices can be divided into threaded, flange, flat, plug-in cylinder, and snap ring types.

4、 Technical parameters of flange remote transmission pressure transmitter

Sensor: Metal capacitive type

Measurement medium: liquid, gas or vapor

Power supply: 24V DC (normal operating voltage range: 10.5-40V DC)

Output signal: two-wire system, 4-20mA DC output, combined with HART protocol digital communication, can choose linear output or square root output.

Measurement range: 0-0.1~1.0Kpa

Explosion proof mark: explosion-proof ExdIICT6, intrinsic safety Exia IICT6

Protection level: IP66

Environmental temperature: -40~85 ℃ (LCD meter head is -30~70 ℃), explosion-proof type: -30~70 ℃, intrinsic safety type: -30~60 ℃

Damping: 0.1-32.0s (adjustable)

Start time: 3 seconds

Specific range: 100:1

Accuracy level: 0.075 level, 0.1 level

Stability: ± 0.2%/36 months

Electromagnetic radiation: compliant with IEC801 standard

Shell: Low copper aluminum alloy/316

5、 Process connection of flange remote transmission pressure transmitter

1. 1/4NPT internal thread

2. M20 * 1.5 external thread

3. 1/2NPT external thread

4. 1/2NPT internal thread

5. Integrated three valve group

Electrical connection: 1/2-1/4NPT threaded end wire sealing joint

Weight: 3.5kg

6、 Application indicators of flange remote transmission pressure transmitter

Working temperature of filling fluid for remote transmission device

1. Silicone oil: -29~300 ℃

2. Inert liquid: -18~204 ℃

pressure limit

1. Threaded type: 14MPa

2. Ring type: 2MPa

3. Flange, plug-in, and flat: rated pressure for flanges

Response time: related to temperature, pressure, remote transmission mode, length and diameter of capillary tube, and filling liquid, etc

7、 Precautions for flange remote transmission pressure transmitter

The remote transmission device of the flange remote transmission pressure transmitter expands the application range of the transmitter, and also has a certain impact on the overall performance, such as increased temperature influence and reaction lag.

To reduce these impacts and meet the requirements of process control, please note the following:

1. Choose the appropriate model for the process, such as pressure, temperature, and filling fluid, etc

2. Capillary tubes should be as short as possible to reduce temperature effects and shorten response time

3. The differential pressure double flange remote transmission device should be symmetrical

4. Choosing thinner and larger diameter membranes can reduce temperature effects

5. The limitations of remote pressure transmission are related to the density of the filling liquid and the difference in pressure transmission height. When used in vacuum systems, it is necessary to calculate the impact of the position of the transmitter and remote transmission device on pressure transmission.