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GRIFFCO Gauge & Instrument Guards
- Product Details
- Specifications
- Applications & Features
GRIFFCO Gauge & Instrument Guards
Accurate Pressure Readings Without Chemical in the Gauge
A gauge guard sits between the process line and a pressure gauge or pressure switch. The chemical presses on one side of a flexible diaphragm; on the other side, a sealed fill liquid passes the pressure on to the gauge.
The gauge shows the true line pressure but never touches the chemical, so it is not corroded or blocked and keeps reading correctly. Guards work in any mounting position.
Supplied Complete
Guards can be supplied fitted with a gauge (Economy, Mid-Range or Premium, or a compound vacuum/pressure gauge), with a pressure switch for an alarm, or on their own. Gauge ranges run from 0 – 1 bar to 0 – 21 bar.
Bodies come in PVC, CPVC, polypropylene and PVDF, or 316 SS, Alloy 20 and Hastelloy C, with a Viton® diaphragm as standard (PTFE or Hypalon® optional), in ¼” to ½” sizes.
Specifications
| Item | Plastic Bodies | Metal Bodies |
|---|---|---|
| Body Materials | PVC, CPVC, polypropylene, PVDF | 316 SS, Alloy 20, Hastelloy C |
| Sizes | ¼", ⅜", ½" (DN 8 – DN 15) | |
| Connections | Threaded (NPT; BSPT optional), flanged or union | Threaded (NPT; BSPT optional) or flanged |
| Diaphragm | Viton® standard; PTFE or Hypalon® optional | |
| Fill | Glycerin and water (70/30) | |
| Maximum Pressure | 17 bar (250 psi) at 21 °C | |
| Maximum Temperature | PVC 60 °C; CPVC, PP 87 °C; PVDF 150 °C | Not stated |
| Gauge Options | None; Economy (brass); Mid-Range (stainless case); Premium (stainless, glycerin filled); compound; or pressure switch | |
| Gauge Ranges | 0 – 1 bar to 0 – 21 bar (0 – 15 to 0 – 300 psi) | |
| Gauge Accuracy | ±2% | |
| Size | 60 mm diameter; about 121 mm high with a standard gauge | |
| Approvals | PVC: NSF/ANSI 61 | – |
Applications
- Dosing pump discharge lines, between the pump and the back pressure valve
- Pressure gauges and switches on chlorine, acid, caustic and other corrosive lines
- Chemicals that would block a gauge, such as slurries or crystallising chemicals
- Pressure switch alarms on dosing skids
Key Features
- Keeps chemicals out of the gauge or pressure switch
- Works in any mounting position
- Plastic and metal bodies to suit the chemical
- Viton® diaphragm standard; PTFE or Hypalon® optional
- Supplied with a matched gauge, a pressure switch, or without a gauge
- Gauge accuracy ±2%
- Threaded (BSP or NPT), flanged or union connections
- PVC version certified to NSF/ANSI 61
