Benefits in High Pressure High Cyclical Applications
The PS61 Pressure Switches are available in two versions: Diaphragm and Piston. The major differences between the two are the different methods that Gems uses to seal off the fluids or gases on the customer’s side of the pressure switch.
- The Diaphragm style is much like a flat disk and is perfect for general use as well as heavy-duty applications. It is designed to hold both oils as well as gases.
- The Piston style is more like a donut shape that seals the oils inside the switch and is geared towards high cycle/high pressure applications like Off-Highway Vehicles, Transportation and Alternative Energy. The Piston style works excellent with oils but does not seal well against gases.
What are the differences?
Most specifications (current capability, temperature ranges, shock & vibration, environmental sealing, etc.) for both versions are the same. The exceptions are:
|
Specification |
Diaphragm Style |
Piston Style |
|
Recommended Media (fluids) |
Liquids & Gases |
Liquids Only |
|
Wetted parts options, elastomers |
Nitrile, FVMQ, FKM, EPDM |
Nitrile, FKM, EPDM |
|
Wetted parts options, housing |
12L14 Zinc-Plated Steel or 316 Stainless Steel |
12L14 Zinc-Plated Steel |
|
Set point range |
10 to 1,350 psi 0.7 to 93 bar |
510 to 4,350 psi 35 to 300 bar |
|
Proof pressure |
6,000 psi 414 bar |
7,000 psi 483 bar |
|
Burst Pressure |
9,000 psi 620 bar |
22,000 psi 1,517 bar |
|
Deadbands |
Small to medium range |
Wide range |
|
Repeatability |
Small range |
Medium range |
When would I use each one?
When you have many options on which version of the PS61 Pressure Switch to choose from, it can be challenging. The chart below can assist you in the decision-making process:
|
Pressure Set Point |
Media |
Deadband Requirement |
Proof Pressure |
Gems Pressure Switch |
Web Link |
|
< 510 psi < 35 bar |
Liquid or Gas |
Small |
< 6000 psi < 414 bar |
PS61 w/ Diaphragm |
|
|
<1350 psi <93 bar |
Liquid or Gas |
Small |
< 6000 psi < 414 bar |
PS61 w/ Diaphragm |
|
|
> 510 psi > 35 bar |
Liquid |
Small |
< 7000 psi < 483 bar |
PS61 w/ Piston |
|
|
> 510 psi > 35 bar |
Gas |
Medium |
< 6000 psi < 414 bar |
PS71 (PS61’s are not rated for use with gases with set points over 510 psi / 35 bar) |