Product/Service

Diaphragm Seal Protectors

Source: Tel-Tru Manufacturing Company, Inc.
Diaphragm Seal Protectors
Protective device used to isolate the pressure instrument from the process fluid being monitored.
Protective device used to isolate the pressure instrument from the process fluid being monitored.

Model W - Welded Diaphragm Seals
Contains metal diaphragm welded to the upper housing. Bolts can be removed and separated at the flanges for cleaning, liquid filling, calibrating, welding, or other purposes, without the loss of the liquid fill fluid. Available with flushing connection. Threaded off-line, flanged off-line and flow through styles are available in many configurations and materials.

Mini Diaphragm Seal Protectors
Economical isolator designed to protect instruments from corrosion and clogging.

Model M "Mini" Seals for up to 3 ½ in. Gauges

  • All-Welded, gasketless design
  • For pressure gauge dial sizes to 3 1/2 in.
  • 1/4 in. or ½ in. NPT instrument connection
  • 1/4 in. or ½ in. NPT process connection
  • Minimum pressure gauge range of 0-100 psi
  • Standard Pressure Rating: 2000 psi @ 100°F
  • Optional 5000 psi pressure rating
  • 1/8 in. or ¼ in. NPT flushing connection optional
  • Low volume rendition optional
  • Materials: 316SS, Monel, Hastelloy B or C, & Carpenter 20

Model M "Mini" Seal for up to 4 ½ in. Gauges

  • All-Welded, gasketless design
  • For pressure gauge dial sizes to 4 1/2 in.
  • 1/4 in. or ½ in. NPT instrument connection
  • ¼ in., ½ in., ¾ in., or 1 in. NPT process connection
  • Minimum pressure gauge range of 0-15 psi
  • Standard Pressure Rating: 1000 psi @ 100°F
  • 1/8 in. or ¼ in. NPT flushing connection optional
  • Materials: 316SS, Monel, Hastelloy B or C, & Carpenter 20

Sanitary Diaphragm Seal Protectors
Designed for food and pharmaceutical industries to ensure that surfaces exposed to process are virtually crack and crevice free.

Model S - Sanitary Seals
All-welded construction which allows removal from system without loss of fill fluid. Construction conforms to methods as described in ASME Standard B20.2-1991, Section 2.3.12. This off-line seal has a diaphragm welded to the upper housing. It is designed to ensure that the surfaces exposed to the process are virtually crack and crevice free. They meet the requirement of the 3-A Sanitary Standard.

Diaphragm Seal Accessories

Fill Fluids
Fill fluids should be selected by carefully considering their physical properties at the extremes of the ambient and process temperature to which they will be subjected. Fill fluids must also be chemically compatible with the process fluid to avoid potentially hazardous reaction in the event of diaphragm failure. Typically, hydrocarbon based liquids must not be used with strong oxidizers, such as oxygen, chlorine, hydrogen peroxide, or nitric acid. For these special applications, an inert liquid such as Fluorolube or Halocarbon is available. Fill fluids diluted with or containing water will not be supplied by Tel-Tru Manufacturing. The presence of water in filled systems can cause gross inaccuracies.

Tel-Tru Manufacturing Company, Inc., 408 St. Paul Street, Rochester, NY 14605. Tel: 716-232-1440; Fax: 716-232-3857.