Chemical / Diaphragm Seal Unit

What is a Diaphragm Seal?

A diaphragm seal is a device in which a flexible membrane (diaphragm)
seals and isolates the measuring instrument from the process medium.
The instrument side of the diaphragm is filled with appropriate fluid. The
pressure exerted by the process fluid on the Diaphragm is hydraulically
transmitted through the seal fluid to the pressure sensing element.
Diaphragm seal protects the pressure sensor from the harmful and
hazardous effect the process fluid.

Where Diaphragm Seal is essential?

Corrosive process fluid
Highly viscous process fluid
Process fluid having sediments or solid particles
Process fluid having tendency to solidify, freeze or crystallize at lower temperatures which may block the sensing element.
Hazardous process fluid

Specification
Different types of Diaphragm Seal offered

The generally offered MOC is as follows :
Non wetted parts: CS, SS304, SS316
Diaphragm : SS316, SS316L, PTFE, SS PTFE coated, Titanium, Hastelloy B, Hastelloy C,
Nickel, Monel, Tantalum
Wetted Parts : SS316, SS304L, SS316L, SS PTFE coated / lined/ block, Hastelloy B, C.
Filling Fluids : Silicone Oil, DC-200 (-45°C to 205°C)
DC-704 (0 to 315°C)
DC-705 (20 to 350°C, Short term exposure up to 400°C)
DC-710 (5 to 345°C)
Fluorolube Oil (-40°C to 150°C)
Glycerine (5 to 80°C)
Halocarbon Oil (-40°C to 235°C)
Food Grade Vegetable Oil (5 to 182°C)

Optional Feature:

Cooling Tower
Capillary for Remote mounting of the Pressure Instrument
Flushing Ring (Spacer Ring) for purging / cleaning the area below the diaphragm
without removing the Seal from the process line.
Stud / Nut & Gasket, for assembling the Diaphragm Seal with Process Flange.

Sandwich Type (Threaded Connection)
Sandwich Type (Flanged Connection)
Threaded Flush Diaphragm Seal (Small / Mini Diaphragm Seal)
Flush Diaphragm Seal (Flanged Connection)
Pan Cake type Diaphragm Seal (Flanged Connection only)
Extended Diaphragm Seal (Flanged Connection only)
In line flow through type (Flanged or Weld in connection)
In line flow through Jacketed type (Flanged or Weld in connection)
In line flow through type with Cylindrical Diaphragm
In line Isolating Ring type

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