Pressure Instrument — Acids
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What LibertyCES's vendor documentation shows
Gauge-guard diaphragm isolators consistently used to protect standard gauges from corrosive process fluid across three independent vendors.
Materials documented for this service
- PTFE diaphragm
- PVDF/PP/CPVC housing
Products cited for this service
Real Specifications
| Plast-O-Matic gauge guard pressure range | Full vacuum to 250 PSI (200 PSI for GGME/GGMU) | plast-o-matic.md |
| Plast-O-Matic diaphragm material | PTFE standard (0-30 PSI+); FKM for 0-15 PSI and vacuum | plast-o-matic.md |
| Plast-O-Matic housing materials | PVC, CPVC (Corzan), Polypropylene, PVDF (Kynar) | plast-o-matic.md |
| Griffco gauge guard tiers | Economy / Mid / Premium, in 316SS, CPVC, Hastelloy C | griffco-valve.md |
| Icon OBS gauge-guard accuracy | ±1.5% (vs ±0.75% for Icon's direct-diaphragm gauges) | icon-process-controls-pressure.md |
| Icon OBS gauge-guard pressure range | 0-160 psi (most models) | icon-process-controls-pressure.md |
A gauge guard trades accuracy for corrosion protection — Icon's own line shows isolated-diaphragm gauge-guard assemblies rated ±1.5% versus ±0.75% for their direct-diaphragm corrosion-resistant gauges, so specifying a gauge guard on a clean, non-corrosive service sacrifices accuracy for no real benefit.
Three independent vendors — Plast-O-Matic, Griffco, and Icon — converge on the same design pattern for acid pressure sensing: isolate a standard, cheap SS316/brass gauge movement behind a PTFE or FKM diaphragm rather than building the whole gauge from corrosion-resistant material. Most suppliers sell whichever gauge is in stock; Liberty CES matches the diaphragm material and pressure range to the acid concentration first, because the diaphragm — not the gauge body — is the only part actually touching the process fluid.
Every material and product claim on this page traces to real, vendor-published documentation on file with LibertyCES. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.
FAQ
Is Pressure Instrument compatible with Acids?
Gauge-guard diaphragm isolators consistently used to protect standard gauges from corrosive process fluid across three independent vendors. This is moderate evidence.
What materials are documented for Pressure Instrument in Acids service?
Materials documented for this service: PTFE diaphragm, PVDF/PP/CPVC housing. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm with a spec review before final specification.
What specific Acids chemicals does this cover?
Named chemicals in this documentation: Sulfuric Acid (general corrosive isolation).
What products are cited for Pressure Instrument in Acids service?
Documented examples include Plast-O-Matic Gauge Guard GGME/GGMU, Griffco Gauge & Instrument Guard, Icon OBS Gauge Guard.
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