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What is an oval flange?
The oval flange is a process connection component that mounts between a pressure transmitter and a pipe or tank flange. It provides a compact, leak‑proof interface for transmitting process pressure to the transmitter’s sensing element.

Why use an oval flange?
Oval flanges are ideal for applications with limited space or where quick disconnection is needed. Their oval shape prevents rotation, ensuring stable alignment and reducing installation errors.

Comment cela fonctionne-t-il ?
The flange is bolted between two mating flanges, compressing a gasket or diaphragm seal. The process pressure is transferred through the flange bore to the transmitter, enabling accurate measurement without direct media contact.

Clamp Flange

What is a clamp flange?
A clamp flange (also known as a tri‑clamp flange) is a sanitary connection device that uses an external clamp to join two flanged ends, commonly used with pressure transmitters in hygienic processes.

Why use a clamp flange?
It is perfect for food, dairy, pharmaceutical, and biotech applications because the smooth, crevice‑free design prevents bacterial growth and allows fast disassembly for cleaning or inspection.

Key advantages

• Tool‑free installation and removal

• Compatible with standard tri‑clamp fittings

• No threads or dead legs, improving hygiene

Pressure Transmitter Housing

What is a pressure transmitter housing?
The housing is the protective enclosure that contains the transmitter’s electronic board, sensor module, and wiring terminals. It is typically made of aluminum, stainless steel, or engineered plastic.

Why use a dedicated housing?
In harsh industrial environments (dust, moisture, vibration, or corrosive vapors), the housing provides IP (Ingress Protection) and NEMA ratings to keep internal components safe. It also offers explosion‑proof or weather‑proof options.

Key advantages

• Protects against water, oil, and dust (e.g., IP67, IP68)

• Shields electronics from electromagnetic interference (EMI)

• Simplifies field mounting with bracket or pipe mount options

Siphon Tube

What is a siphon tube?
A siphon tube (or pigtail siphon) is a coiled or U‑shaped tube installed between a high‑temperature process line and a pressure transmitter to protect the transmitter from heat damage.

Why use a siphon tube?
When measuring steam or hot fluids (above 100°C / 212°F), direct contact can destroy the transmitter’s electronics or diaphragm. The siphon tube creates a condensate barrier that absorbs and dissipates heat.

Comment cela fonctionne-t-il ?
The tube is filled with condensate (e.g., water in steam service). The process heat transfers to the condensate rather than the transmitter, reducing the temperature at the transmitter port to safe levels while pressure is transmitted through the liquid column.

O‑ring

What is an O‑ring for pressure transmitters?
An O‑ring is a resilient elastomeric seal that fits into a groove between the pressure transmitter’s sensor module and the mating flange, preventing process fluid leakage.

Why use an O‑ring?
It provides a reliable, low‑cost sealing solution for static applications under high pressure or vacuum. O‑rings accommodate minor flange surface imperfections and thermal expansion.

Comment cela fonctionne-t-il ?
When the flanges are tightened, the O‑ring is compressed and deforms, filling the gap between sealing surfaces. The material (e.g., Viton, EPDM, or PTFE) is chosen based on chemical compatibility and temperature range.

Flushing Ring

What is a flushing ring?
A flushing ring is an accessory inserted between the process flange and the pressure transmitter’s diaphragm seal. It has side ports for introducing a flushing liquid or cleaning solution.

Why use a flushing ring?
It is the perfect solution for media that tend to clog, crystallize, or solidify on the diaphragm. The flushing ring allows in‑place cleaning without removing the transmitter, reducing downtime.

Comment cela fonctionne-t-il ?
A compatible rinse liquid (e.g., water, solvent, or steam) is injected through the side valves. The gentle flow washes away debris from the diaphragm surface, restoring measurement accuracy. An air‑bleed feature helps purge air after flushing.

Pressure Transmitter Accessories FAQs

1. Are BCST’s pressure transmitter accessories compatible with other brands? Absolutely. While our accessories are designed for a perfect fit with BCST transmitters, we engineer them based on universal industry standards. Many of our products, such as mounting brackets, manifolds, and diaphragm seals with standard process connections, are fully compatible with transmitters from other major manufacturers. As an OEM factory, we understand the need for interoperability. Please provide our technical team with your existing transmitter’s specifications, and we can confirm compatibility or suggest the ideal solution.

2. What materials do you use for your pressure transmitter accessories? At the BCST factory, we use a range of high-quality materials to suit various industrial applications. Our standard offering includes robust 316L Stainless Steel for its excellent durability and corrosion resistance. For more aggressive or corrosive media, we provide accessories made from specialized alloys like Hastelloy C-276, Monel, and Tantalum. This material diversity ensures we can supply a reliable and long-lasting accessory solution for even the most challenging process environments, directly from the manufacturer.

3. What is the advantage of using a 3-valve or 5-valve manifold? Using a valve manifold from BCST significantly enhances the safety and serviceability of your pressure transmitter. A 3-valve manifold allows you to isolate the transmitter from the process line, equalize pressure, and vent it for safe removal, calibration, or maintenance without a process shutdown. A 5-valve manifold offers the same functions but adds two vent or test ports, allowing for in-situ calibration by connecting a pressure calibrator directly to the manifold, which is a key efficiency advantage.

4. What certifications do BCST accessories hold? BCST is committed to global quality and safety standards. Our manufacturing facility is ISO 9001 certified for quality management. Many of our pressure transmitter accessories, especially those for hazardous areas, are certified to CE, ATEX, and IECEx standards. For safety-critical applications, we also offer products with SIL (Safety Integrity Level) ratings. These certifications assure you that our products, manufactured in our own factory, meet the stringent requirements for reliability and safe operation in your industry.

5. What is your typical lead time for accessories? As a direct manufacturer with a streamlined production process, BCST offers some of the most competitive lead times in the industry. For standard, in-stock items, we can often ship within a few business days. For larger bulk orders or custom-configured accessories, our lead time is significantly shorter than that of distributors who rely on third-party suppliers. We prioritize fast delivery to help you minimize downtime and keep your projects on track. Please contact us for a precise delivery estimate for your specific needs.

6. Can BCST provide custom accessories for unique applications? Yes, customization is a core strength of the BCST factory. Our in-house engineering team specializes in developing tailored solutions. If you have unique mounting requirements, non-standard process connections, or need accessories made from special materials, we can work with you to design, manufacture, and test a custom product. Our direct-from-manufacturer model makes the customization process efficient and affordable. We are your partner in solving complex instrumentation challenges.

7. How do I choose the right diaphragm seal for my application? Choosing the right diaphragm seal is crucial for protecting your pressure transmitter. You should consider three main factors: the process media (for material compatibility), the process temperature, and the pressure range. For example, corrosive chemicals may require a Hastelloy C diaphragm, while high-temperature applications need a specific fill fluid. The BCST technical support team can guide you through the selection process to ensure you get a diaphragm seal that guarantees accurate measurement and long service life.

8. What is the purpose of a capillary tube in a pressure measurement setup? A capillary tube is used to connect a diaphragm seal to a pressure transmitter when the transmitter needs to be mounted away from the process connection. This is often necessary for applications involving very high temperatures, excessive vibration, or difficult-to-access measurement points. The tube is filled with a specific fluid that hydraulically transfers the process pressure to the transmitter’s sensor. BCST manufactures high-quality capillary systems to ensure accurate and stable remote measurement.

9. What warranty does BCST offer on its pressure transmitter accessories? All pressure transmitter accessories manufactured by BCST come with a comprehensive factory warranty. We stand behind the quality and craftsmanship of our products. Our standard warranty typically covers defects in materials and workmanship for a period of 12 to 18 months. Because you are buying directly from the manufacturer, any warranty claims are handled efficiently by our dedicated customer support team, ensuring a quick and satisfactory resolution.

10. How does buying directly from the BCST factory benefit my business? Buying directly from the BCST factory offers three main benefits. First, you get better pricing by eliminating distributor markups. Second, you receive products faster due to our streamlined production and inventory management. Third, you gain direct access to our technical experts for support, customization, and faster problem-solving. This direct partnership strengthens your supply chain, reduces costs, and ensures you receive the highest quality, certified accessories for your critical operations.