Plast-O-Matic
GGS chemical gauge guards — a stainless steel hex insert isolates pressure and vacuum instruments from corrosive process fluid, without the overtightening breakage that ruins unprotected gauges.
What LibertyCES specifies from Plast-O-Matic
Stainless steel hex insert eliminates the overtightening breakage that destroys unprotected gauges — full vacuum to 250 PSI, PTFE diaphragm standard.
6-fastener removable housing cleans the diaphragm and lower cavity without draining fill liquid or recalibrating the protected gauge.
Spigot Mount & Process Connection Options
Asahi/GF metric spigot (butt or socket fusion) or IPS spigot (butt fusion only), across PVC, CPVC, Natural Polypro, and PVDF.
Maximum Gauge Rating by Fluid Line Temperature
Maximum recommended gauge PSI at a given fluid line temperature, measured at 80°F/26°C ambient.
| Material | 77°F | 140°F | 212°F |
|---|---|---|---|
| Geon PVC | 0-250 PSI | 0-57 PSI | N/R |
| Corzan CPVC | 0-250 PSI | 0-140 PSI | N/R |
| Natural Polypro | 0-160 PSI | 0-80 PSI | N/R |
| Glass-Filled Polypro | 0-160 PSI | 0-160 PSI | N/R |
| Kynar PVDF | 0-250 PSI | 0-150 PSI | 0-90 PSI |
Frequently Asked Questions
What is the maximum working pressure on a Plast-O-Matic GGS gauge guard?
250 PSI in most material/configuration combinations, with the diaphragm rupture point at approximately 400 PSI. For dangerous fluids such as acids, Plast-O-Matic recommends a minimum 4x safety factor — keeping process fluid pressure at 100 PSI or lower.
Which diaphragm material should I specify for my gauge range?
PTFE is standard for gauges 0-30 PSI and above. FKM elastomer diaphragms are used for 0-15 PSI and vacuum applications. Material selection depends on the actual gauge pressure range, not the process line pressure.
Can the GGS gauge guard be cleaned without recalibrating the gauge?
Yes, with the removable housing option (-R suffix). Loosening 6 fasteners lets the upper housing pull away while the diaphragm and fill liquid stay captured in the retaining ring — so particulate or scale gets cleaned out of the lower cavity without draining fill liquid or disturbing the gauge calibration.
Get the right material and diaphragm for your gauge and chemistry
Ready to buy or need a fast answer? Call, text, or email James directly — (559) 395-5500 · [email protected].