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Diaphragm Seal - Welded Mini-Seals



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Welded Mini Seals are ideal for applications where a gauge or general purpose transmitter cannot be installed directly into the process media. Mini seals are a one-piece, all-welded construction that offer a durable, economical choice for protecting a pressure instrument from corrosion, clogging, or high process temperatures.

  • Economical Choice for Protecting a Pressure Instrument from Severe Process Media
  • All-welded Design Reduces Fugitive Emission Leaks
  • Available with PulsePlus™ Pulsation Dampening
  • Tamper Resistant


Construction Materials

Upper Housing: 316SS Diaphragm: 316SS Hast C-276, Monel Lower Housing: 316SS, Hast C-276, Monel

Process Temperature Limits

MS4 -40°F/300°F
MS6/7 -40°F/400°F
MS8 -110°F/750°F

Ambient Temperature Limits

Determined by the Pressure Instrument

Minimum Recommended Pressure Ranges

2.5” & 3.5” Gauges 30 psi 15 psi 10 psi 15 psi
4”, 4.5”, & 6” Gauges n/a 60 psi 15 psi 30 psi
Transmitter(Gauge Pressure) 15 psi 10 psi 100” WC 150” WC
Transmitter (Differential Pressure) n/a n/a 150” WC 300” WC

Maximum Working Pressure at 100ºF

316SS Hast-C Monel
MS4 2,000 psi 1,000 psi 1,000 psi
MS6 1,000 psi N/A N/A
MS7 750 psi 750 psi N/A
MS8(1/4 or 1/2” connectors) 5,000 psi 2,000 psi N/A
MS8 (3/4” male) 2,000 psi N/A N/A
MS8 (1” male) 1,000 psi N/A N/A

Data Sheet

Download Datasheet

Installation Instructions

Download Installation Instructions: