The flush flanged diaphragm seal pressure transmitter uses a diaphragm directly welded to the mounting flange, working in conjunction with an inline pressure transmitter to protect against the effects of high and low temperatures, corrosive, clogging, or erosive processes.
Sino-Inst offers a variety of Diaphragm Seal DP/Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.
Features of Diaphragm Seal Pressure Transmitter
- Flange installation; flange size and standards can be customized.
- Diaphragm isolation technology.
- Two-wire system, 4-20mA analog output, HART protocol digital communication.
- Intelligent LCD display with backlight.
- Large diaphragm, fully welded seal, long-term reliability and durability.
- Corrosion-resistant diaphragm options available (tantalum, HaC, 316L, 316L PTFE sprayed).
- Especially suitable for high-temperature viscous liquids.
- HART communication function available.
Read more about Steam pressure transmitter-Pressure measure on steam pipeline
Specifications of Diaphragm Seal Pressure Transmitter
| Measuring medium: | Liquid or gas (compatible with contact material) |
| Pressure range: | -100kPa～0～10MPa (see range selection table for details) |
| Pressure method: | Gas pressure, absolute pressure |
| Medium temperature: | -40～130℃, other high temperatures can be customized up to 60℃ |
| Connection time: | 20ms |
| Accuracy class: | ±0.5%FS |
| Indicator accuracy: | 0.05%FS LCD (with backlight) display |
| Temperature compensation: | -20～80℃ |
| Stability performance: | ±0.2%FS/year |
| Temperature drift: | ±0.02%FS/℃ (within temperature compensation range) |
| Explosion-proof type: | Explosion-proof type ExdbⅡCT6Gb; Explosion-proof dust type ExtbIIICT80℃Db; Intrinsically safe type ExiaⅡCT6Ga (4～20mA/4～20mA HART output only); Dust intrinsically safe type ExiaD20T80℃ (4～20mA/4～20mA HART output only); |
| Protection class: | IP66; |
Applications
The Flush Flanged Diaphragm Seal Pressure Transmitter uses a standard flange as its interface, allowing for on-site flange installation. Because the pressure-bearing diaphragm is exposed and directly senses the pressure, it is easy to clean and meets harsh operating conditions such as moisture resistance, waterproofing, and explosion protection.
This series of products is widely used in industrial process control, petroleum, chemical, and metallurgical industries, as well as in applications involving viscous media containing particles.
- High/low temperature fluids;
- Highly corrosive/high viscosity fluids;
- The fluids which may cause clogging of impulse piping in the low temperature;
- Toxic fluids;
- The fluids containing suspended solids which are deposited in the impulse piping and may cause clogging.
Extended reading: Featured Diaphragm Seal Pressure Transmitters
Diaphragm flange material selection
The biggest advantage of the Diaphragm Seal Pressure Transmitter is the availability of various diaphragm materials. Commonly used diaphragm materials include SUS316L stainless steel, tantalum, Hastelloy, Monel alloy, pure titanium, and F4 alloy.
Choosing the right material means considering both its corrosion resistance and cost-effectiveness. For example, tantalum and Hastelloy diaphragms offer excellent corrosion resistance but are expensive, making them suitable only for highly corrosive environments; other inexpensive materials are not suitable.
The table below introduces several commonly used corrosion-resistant materials suitable for corrosive media for your reference.
| Corrosive medium | Tin bronze (QSn6.5-0.4) | SUS316 | Pure tantalum (Ta) | Monel (Ni70Cu30) | Hastelloy (HC) | Polytetrafluoroethylene (F4) |
| Sulfuric acid (H2SO4) | V | △ | ○ | V | V | V |
| Nitric acid (HNO3) | ╳ | V | ○ | ╳ | V | V |
| Hydrochloric acid (HCI) | △ | ╳ | ○ | ╳ | V | V |
| Phosphoric acid (H3PO4) | V | V | ○ | V | V | V |
| Acetic acid (CH3COOH) | V | V | ○ | V | ○ | V |
| Caustic soda (NaOH) | △ | ○ | △ | ○ | ○ | V |
| Soda ash (Na2CO3) | ○ | ○ | ○ | ○ | V | V |
| Baking soda (NaHCO3) | V | ○ | ○ | ○ | ○ | V |
| Chlorine (CI) | Dry: V | Dry: V | ○ | Dry: V | V | V |
| Wet: ╳ | Wet: ╳ | Wet: ╳ | ||||
| Bromine (Br2) | Dry: △ | Dry: ╳ | ○ | Dry: ○ | ○ | V |
| Wet: ╳ | Wet: △ | Wet: ╳ | ||||
| Ammonia (NH3) | ╳ | V | ╳ | ╳ | ○ | V |
| Seawater (30% NaCI) | V | V | ○ | ○ | ○ | V |
Extended reading: Common Pressure Sensor Applications
What is a diaphragm seal pressure transmitter?
The diaphragm seal pressure transmitter is a flange-type pressure transmitter. This type of pressure transmitter assembles diaphragm seals to field transmitters for the purpose of measuring pressure, pressure or level.
What is a diaphragm seal?
Diaphragm Seals, also known as Chemical Seals or Gauge Isolators, are used to isolate pressure instrumentation, like pressure gauges, pressure transmitters, pressure switches, level transmitters, and more, from process media that is hot, corrosive, clogging, or otherwise damaging to the pressure instrument.
A diaphragm seal has two primary tasks:
- Separation of the measuring instrument from the process medium
- Transfer of the pressure to the measuring instrument
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What is a remote seal?
The remote seal is used to prevent the medium in the pipeline from directly entering the pressure sensor assembly in the pressure transmitter. It is connected to the transmitter by a capillary filled with fluid. As a result, they’re often used in refining, petrochemical, and chemical plants.
Extended reading: SI-703 Flush Diaphragm Pressure Sensor
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FAQ
Sino-Inst is Flush Flanged Diaphragm Seal Pressure Transmitters manufacturer in China. We offer all types of Pressure Level Transmitters. Like Direct Mounted, flange-mounted, single flange, double flange, Remote Diaphragm Seals, High Static, Digital Remote.
Most of our Diaphragm Seal Pressure Transmitters are used in oil, liquids, DP transmitters, flow measurement, level measurement (like the ultrasonic level measurement), density, and other process variables.
You can ensure product safety by selecting from a certified supplier with ISO9001, ISO14001 certification. We will share more about instrument calibration, like the flow transmitter calibration.
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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.