FTB Diaphragm Seals are especially suitable for pressure sources with corrosive acids, fluids or sticky compounds combined where pressure sources might harm the gauges directly. They are widely used in petroleum, food, chemical, and pharmaceutical industries.

General Specs of Gauges
Dial Size: 1 1/2" to 6"
Bourdon/Coiled Tube: Germany-Imported SS316 Material.
Movement: Germany-Imported SS430 Material.
Internals & Socket: SS316 Material.
Accuracy: ±2% on 1 1/2" and 2", ±1.5% on 2 1/2", 4", ±1% on 6".
Liquid-Filled: Imported 99.95% Purity Glycerin, or Optional Silicone.
Mounting: Lower Mount (Bottom), Back Mount, Back Mount with Flange, Back Mount with U-Bracket.
Pressure Ranges: Vacuum, Compound, 0-1000 bar.
Bezel Type: Standard Crimped Bezel, or Optional Bayonet Ring.
Dial Scales: Standard Dual Scale with kg/cm²/psi, psi/bar, and etc.

Diaphragm Material
Our standard diaphragm is made of S.S. 316 for upper and lower parts; other requests for special materials, shown below, are acceptable on demand.
S.S. 304, P.V.C., F.R.P., Nickel, Hastelloy B&C, Teflon (PTFE), Tantalum, etc.

Liquids Filled
The selections of the fillings depend on the temperature expected in any given applications. Our standard fillings are glycerine and silicone.

Capillary Tubes
Standard length of capillary tubes is 3 meters extending up to 10 meters.

Technical Data
Ranges: vacuum of -1/0 bar; minimum pressure of 1 bar and 400 bar maximum.
Temperature ranges: -20...+200°C (temperature of diaphragm) upto 400°C max.

FD-100 Series with s.s. 316 upper and lower housing and s.s. 316L diaphragm.
FD-200 Series (double-flanged) diaphragms with S.S. 316/304 structured. Flange selections of JIS 5K, 10K, or ANSI 150 series are available. 1/2"-2" connections applied.

FD-300 Series (flange type) with SS 316 housing.  Flange selections of JIS 5K, 10K, or ANSI 150 series are available.  2"-4" connections applied.


Special Diaphragm with Customized designs for various applications, such as food processing and medical industries.


Diaphragm Seals with Capillary are available on FD-100 and FD-300 series. Standard length of capillary is 3 meters extending up to 10 meters.


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Stainless Steel 316 Ti Stem for long-lasting life span to be exposed under extreme conditions.		Important components make the accuracy accurate.