How to Choose the Correct CCS Pressure Switch
In choosing the correct pressure switch, these are some common questions to ask to help you narrow down and choose the right CCS model:
1. Will the pressure switch be needed in a hazardous area?
All CCS switches that are rated for hazardous areas are denoted by the letter “E” for explosion-proof in the part number, for example (6900GE).
2. Are any hazardous or country-specific certifications required for the pressure switch?
Different countries require different certifications for hazardous area conformance and quality conformance. As an example, in Canada, there are sometimes both CSA and Dual Seal requirements for Class I explosive environments, but there is also cUL which is the Underwriter Laboratories for Canada who certifies for quality conformance.
A matrix matching our CCS models with certifications can be found at our website.
3. What type of pressure is being measured?
There are different model switches depending on the type of pressure measured:
Measures standard positive atmospheric pressures. CCS offers gage pressure switches up to 16,000 PSI. CCS Models for gage pressure have a letter “G” or “P” in the part number. “G” stands for diaphragm-based gage switches, while “P” stands for piston-based switches.
Measures very low negative atmospheric pressures. CCS Models for vacuum pressure have a letter “V” in the part number.
Measures the pressure difference between two pressure inputs. These switches have two pressure ports and have the letter “D” in the part number.
4. What pressure range or set point is required of the pressure switch?
Each family of CCS pressure switches offers different pressure ranges which a switch can be set to. For example, the 6900G series offers 7 different increasing set point ranges: 3-20, 6-75 psi, 12-150 psi, etc. Each part also has a similar decreasing set point range that is slightly different due to the deadband.
5. Will the switch need to be factory set or field adjustable?
CCS offers, for a small charge, to set the switch at a given trigger point at our factory.
6. Is a specific proof pressure required?
Some applications will see high spikes of pressure and a high proof pressure will be needed so the switch is not damaged. CCS has some switches (6900P42) with proof pressures as high as 25,000 PSI.
7. Will the switch need to be stainless steel or will an aluminum body work?
In some harsh environments corrosion of an aluminum switch may happen. For these applications it might make more sense to have a stainless steel body. CCS offers a stainless steel body as the standard on our 6905 series, 6900PZZ and 6900GCZZ Series.
8. Does the switch need to be a small profile?
For applications where a smaller size of pressure switch is needed, a 604 or 646 series pressure switch can possibly be too large. CCS offers the 611 series pressure switch which is a smaller-sized pressure switch at just 4.5” long and has both vacuum pressures available as well as gage pressure ranges up to 180 psi. The proof pressure rating for the 611 series is just 1000 psi. If higher pressure ranges or proof pressures are needed then the 6900 series should be considered. It also has a relatively small profile at 5.7” length and, has pressure ranges all the way up to 16,000 psi.
9. Are all the wetted parts compatible with the medium being measured?
Wetted materials are any surface which comes into contact with the medium being measured. These are the: diaphragm or piston, the O-ring seal, and the pressure port inlet. For very corrosive mediums or mediums at very high or low temperatures, a welded stainless steel pressure capsule can be used. This is denoted by the letter “C” in CCS part numbers.
10. Is the pressure port size correct for the application?
The pressure port must have the correct thread size as the application being sensed or else the two parts will not mate correctly. Standard pressure port sizes for CCS switches are typically either ¼”-18 National Pipe Female Thread or NPFT, ½”-14 NPFT, or for some limited models like the 611GZ810, it is 1/4” NPT male.
11. Finally, what electrical connection is required?
The electrical connection of a pressure switch also requires a proper mating thread size for the switch to be compatible. A ½”-14 NPT Male connection is offered standard on many of these common CCS models, a ¾”-14 NPT Female is standard on the 604 series pressure switch, and a British M20 mating thread is offered on the 6905.
In addition, for most models CCS offers both a Single Pole-Double Throw (SPDT) or Double-Pole Double-Throw (DPDT) wiring setup. If the pressure application requires two electrical connections instead of one, then the DPDT option should be used and is denoted by the letter “M” in CCS part numbers.
To learn more about our products, or to speak to a representative, contact us today!