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

AcuGuard Isolators use a buffer between the chemicals and the internal parts of the pressure gauge, ensuring the gauge is always protected from corrosive damage. The housing of the AcuGuard 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 reads the process chemical instantly without ever coming into direct contact with the corrosive chemical.

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

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

The following are the specifications of the commonly used AcuGuard pressure gauge isolators:

Specifications of Pressure Gauge Isolator

• Gauge installed is a U.S. made Ashcroft 1008s All Stainless 63mm (2.5″) Glycerin Filled Gauge, accuracy is +-1% of span.
• Modified PTFE diaphragm standard, with 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 meets or exceeds 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.