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Pressure switches, differential
Pressure switches, differential
The range of differential pressure switches includes components for general industrial use as well as specialised switches for demanding applications
Code number selector
Approvals & certificates (31)
What is the maximum/minimum pressure/temperature at which Danfoss switches can be set?
Answer: Danfoss manufactures various pressure switches which can have a setting range of anywhere between -1 to 400 bar and temperature switches from -60 to +300°C. However, each switch will have its own regulation range as detailed within the product catalogue pages. It is always good practice to avoid choosing a product which will be switching near to the limits of its range.
What is the DIN numbering of terminals?
Answer: Terminal numbers are always ODD for inputs & EVEN for outputs, which explains why the changeover switch in almost all pressure & temperature switches has numbers 1, 2 & 4. The live feed goes in at 1. It comes out at 2 when the pressure or temperature is low (so take this to your pump or heater as a live feed) out of 4 when the temperature or pressure is high. (You can take terminal 4 to a ''satisfied'' tell-tale lamp or to an unloading valve or cooling fan, if you wish).
What is differential?
Answer: The differential is the difference between a switch cutting in and cutting out – it is like on a kettle after it has boiled and switched off, you can not switch it on again until the kettle has cooled down a little. Too small a differential will give rise to short running periods with a risk of hunting. Too high a differential will result in too large pressure or temperature oscillations.
How can the differential in RT controls be adjusted?
Answer: To set a differential in RT unit, please use the diagram that can be found in customer instruction. The diagram shows which digit should be set at the differential setting disc to obtain required differential. The input to the diagram is differential range and neutral zone, which gives the setting position on the setting disc.
After installing the switch and making the setting based on scale values, the real system pressure value and scale value seem not to correspond. What is the reason?
Answer: Scale values are indicative only and for accurate settings a pressure gauge (for pressure switches) or a thermometer (for temperature switches) must be used.
Where can I find approvals and certificates for Danfoss products? E.g. do you have a PED certificate for KP7W?
Answer: You can find product approvals and certificates for all our products on our internet website. Follow this link to search for documents either by product or by authority: http://www.danfoss.com/BusinessAreas/IndustrialAutomation/Documentation/Approvals+and+Certificates.htm
Do Danfoss products comply with RoHS directive (Restriction of Hazardous Substances)?
Answer: Yes, all declarations of conformity, including RoHS and WEEE, can be found in our internet product catalogue. Look up the product of your interest and find the relevant document either under the Literature link or the Approvals & Certificates link.
I am looking for the on/off switch with the highest possible IP protection, what options do I have?
Answer: KPS and CAS pressure and temperature switches has the highest IP protection - IP67.
How does the manual reset work in relation to on/off switches?
Answer: After cut out operation, the unit (pressure or temperature switch) will not cut in until the reset button is manually activated.
What is differential setting (pressure or temperature)?
Answer: The differential pressure or temperature setting is the difference between cut-in and cut-out pressure or temperature level.
What does SPDT stands for?
Answer: Single Pole Double Throw refers to the type of the contact system.
What is the most common contact system type used in Danfoss switches?
Answer: The SPDT (Single Pole Double Throw) contact system is the most used.
Which is the best choice among pressure switches for marine applications with high pulsating media?
Answer: Pressure switches with a diaphragm type of sensor (types MBC, KPS, CAS) are the most capable for systems where high pulsations occur. When such pulsations are present, a damping device or pulse snubber should be considered.
What would be the best pressure switch choice for applications requiring high repeatability, accuracy and adjustable differential?
Answer: RT switches used for regulation, monitoring and alarm purposes feature the highest repeatability and accuracy. They are also available with adjustable differential.
When is it recommended to use a gold-plated contact system?
Answer: Gold plated contacts are particulary suitable for low voltage contol systems.
I'm looking for a Danfoss code number and I have not found it in any catalogues?
Answer: Som code numbers are not available for all markets, or it may have been replaced by another number. To resolve the issue, please contact your nearest Danfoss office: http://www.danfoss.com/Contact/Worldwide/
Could I send you a Danfoss part for repair?
Answer: Danfoss does not have repair departments locally. For warranty or complaints issues, please contact your nearest Danfoss sales office and they will tell you how we handle these issues in your area.
Does Danfoss offer products with ATEX certificate (EEx)?
Answer: Yes, you can order solenoid coils, switches, pressure transmitters and temperature sensors with this approval.
Can I order the membrane for the CAS 155 as a spare part?
Answer: No, unfortunately you need to order a new pressure switch.
Where I can find technical information regarding on/off switches?
Answer: In our internet catalogue you can see all relevant product data, as well as download literature and approvals for the specific products.
Can a RT262AL pressure switch be used with water?
Answer: Yes, the RT262AL can be used with water, however it is primarily designed for ammonia. For use exclusively with water we have other RT options; please see our internet product catalogue.
Do I need an external power supply for RT switches?
Answer: No, our RT range of temperature and pressure switches operate without external power supply. The switching force comes from the bellows. It works with an SPDT switch over contact.
Can you deliver your products worldwide?
Answer: Yes, we have own distribution centres across the world, working together with more than 100 distributors and agents. You can see your nearest distributor or Danfoss office here: http://www.danfoss.com/Contact/Sales_and_Services/
Do you have a complete catalogue showing all your products?
Answer: Our internet product catalogue is the most extensive information source: http://www.danfoss.com/Products/Categories/ Besides these products, Danfoss also produces customer-specific products and solutions that are not visible in the catalogue. Please contact your nearest Danfoss office to discuss your needs and how we can meet them.
Can you deliver products exclusively made for us?
Answer: Yes, we have the possibility to develop products that are unique for one customer subject to individual agreements. The products may differ in appearance, technical features or packaging. Please contact us to discuss your requirements.
Which distribution channels does Danfoss use?
Answer: Danfoss makes use of different channels, including distributors, to suit the markets' needs. An increasing number of our customers use our web ordering and EDI e-commerce solutions.
Can I review your stock online?
Answer: Yes. By using Danfoss web-ordering, you can check product availability. Please contact Danfoss to get access to web-ordering.
Where can I find technical drawings of Danfoss products?
Answer: Dimension and function drawings of our products are often part of the products'' technical leaflets. In our internet product catalogue (http://www.danfoss.com/Products/Categories/), find the product of your interest, then follow the Literature link to see available items.
Where do I direct commercial or technical questions?
Answer: Danfoss worldwide sales and services is available here: http://www.danfoss.com/Contact/Sales_and_Services/ Your nearest Danfoss office will be able to answer your question, or have it directed to the appropriate expert.
Do you have local stock?
Answer: This depends on the country and product concerned. Our logistics are set up to achieve competitive and reliable delivery performance for our customers.
Where can we find your data sheets?
Answer: All relevant literature, including technical brochures, are available on our Web site: http://www.danfoss.com/BusinessAreas/IndustrialAutomation/Documentation/Industrial+Automation+Literature.htm
Do you have local websites in my language?
Answer: Yes, please see http://www.danfoss.com/ and then use the "Local sites" option in the top righthand corner.
Is it possible to place orders online?
Answer: Yes, you can place orders and access order information online. Please contact Danfoss to get access to web-ordering. You can see the benefits of Danfoss web-ordering at http://www.danfoss.com/Products/ebusiness/
Does Danfoss operate globally?
Answer: Yes. More than 100 Danfoss sales companies and more than 100 agents are spread across the world, making Danfoss nearby, always.
Is Danfoss a German company?
Answer: No, it is a globally acting group with headquarters in Denmark.
Is it possible to order an MBC with short cable and special plug (different then DIN plug)?
Answer: Yes, we have many options outside our standard programme - please contact Danfoss to specify your needs.
Where can I find some technical information about your products?
Answer: Please see our online product catalogue: http://www.danfoss.com/BusinessAreas/IndustrialAutomation/Product+catalogue/IA+product+catalogue.htm
Is it possible to recognize if a RT has "double" bellows installed, from just looking at it from outside?
Answer: Yes, there is one feature that enables you to recognize that the RT has double bellows; a nut (key 32 mm) on the pressure connection.
Can you send me literature, brochures or catalogues on your products?
Answer: We appreciate your interest and will happily send you an overview of our offering in print. Please contact your local Danfoss office or e-mail us on firstname.lastname@example.org, describing your interest and application.
I placed an order through e-commerce. Could you please check the delivery dates and inform me the earliest possible delivery?
Answer: Delivery dates are supplied in the e-commerce system and based on Danfoss standards. If the confirmed delivery date is not acceptable, please contact Danfoss through e-mail or telephone.
How can I monitor when I have to change the element of my filter?
Answer: Please use our differential pressure switch; take the inlet and outlet pressure of the filter. When the element is saturated the pressure will increase and the switch will turn on, warning you.
Is a pressure switch' differential and a differential pressure switch the same?
Answer: No, the differential of the pressure switch is an option that you have in a switch to set individually cut-in and cut-out difference. A differential pressure switch is a switch that has two seperate pressure inputs and act on this difference.
Which switches should I use for seawater - or other media with particles or depositions?
Answer: In case of seawater you should generally use diaphragm versions of switches: - KPS 43, 45 & 47 - CAS 143, 145 & 147 - MBC 5100 with diaphragms Seawater may contain contamination and certainly salt, both of which will likely accumulate inside the application. Not least inside the switch,, because the water inside is almost still (no flow). If salt crystallizes on the bellows surface it can easily affect its proper function. In case of diaphragms, very smooth and flexible, this problem is less visible. This will cause the depositions to be removed from its surface, and until the whole system is filled and blocked with depositions, it will work. Depositions are especially dangerous when you have a small bellows - like in MBCs. If you need to use bellows version of switches then try to choose comparatively big bellows - surfaces on which depositions are stored are comparatively far away and it would take a longer time before they affect bellows function. RT is a switch of this kind.
Where do I find production date on pressure or temperature switches?
Answer: Look for a code similar to the below: AB - identifies factory location (in this case, Poland) 29 - first two digits tell you production week 6 - last digit tells you about production year (2006)
For the Pg plugs sold with MBC, which are the recommended cable diameter sizes?
Answer: Cable diameter should be: Pg9: 6-8 mm Pg11: 8-10 mm Pg13.5: 10-14 mm This is valid only for plugs used with MBC products.