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AquGuard: Pressure Gauge Isolators for Corrosive Chemicals

Aquflow pressure gauge isolators use a buffer between the chemicals and the internal parts to protect the pressure gauge from corrosive damage

Pressure measurement in a chemical injection system is like pulse measurement in a human patient. That is the reason we strongly recommend using a pressure gauge near the discharge of the chemical metering pump. However when you are dealing with nasty chemicals that can corrode through the internal components of pressure gauges you will either have dead pressure gauges or at the very least inaccurate pressure gauges. That is the reason it is important to protect the pressure gauge and its performance parts by using a gauge isolator.

AquGuard Isolators use a buffer between the chemicals and the pressure gauge internal parts so the pressure gauge is always protected from corrosive damage. The housing of the AquGuard is made from a material that is corrosion resistant to the given chemical and the top part is filled with liquid to transmit the pressure to the gauge. The gauge thus instantly reads the process chemical without ever coming in contact with the corrosive chemical directly.

AquGuards are available in a variety of corrosion resistant materials such as,

  • 316 Stainless Steel
  • Ally 20
  • Hastelloy C
  • PVC
  • PVDF

Following are the specifications of the commonly used AquGuard pressure gauge isolators.


  • Gauge Installed is U.S. Made Ashcroft 1008s All Stainless 63mm (2.5″) Glycerin Filled Gauge, Accuracy is +-1% of span.
  • Modified PTFE diaphragm Standard, Viton or EPDM Available.
  • Diaphragm is Convoluted for Accurate Pressure Transmission.
  • Stainless steel reinforced instrument connection. Integrally molded. “Unbreakable!”.
  • Reinforced process connection with compressive spoke ribs to transfer the tensile stress into compression.
  • Wall thickness meet or exceed ANSI Schedule 120.
  • Sufficient displacement to handle the required volumetric displacement of all instrument sizes and pressure ranges.
  • Integral wrench provisions for field service and maintenance. Diaphragm is Replaceable.
  • Low Profile Design eliminates Dead Volume