Temperature Monitoring & Control Introduction Literature FAQ Photos Temperature Monitoring & Control Question: 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. Question: 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). Question: 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. Question: I need a spare part for my product. Do you have that?    Answer: Please see the relevant accessories sections in our internet product catalogue, which will list all available spare part options for your market. Question: 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. Question: How can I characterize vapour charge in the sensor of the temperature switch?    Answer: The sensor is filled with small quantity of liquid charge (normally propylene) and its saturated vapour. Sensor must be the coldest part. Ambient temperature has no effect on working points. Question: What does it mean that an RT switch has an IP66 grade?    Answer: IP is a classification of enclosure grades. It contains 2 digits. The first digit indicates the degree of enclosure against foreign bodies and the second one indicates the degree of water tightness. IP66 means that a wire of 1 mm diameter and dust cannot enter, and that the enclosure will withstand water jets from all directions, 100 l/min. Question: How I can characterize adsorption charge in the sensor of the temperature switch?    Answer: The sensor is partially filled with carbon particles, and the rest of the element contains superheated gas, normally CO2. Reaction is always in the sensor and working point will vary with the ambient temperature. Question: 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. Question: 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 Question: What is the time constant in relation to temperature switches?    Answer: The time constant of a temperature switch is an expression of the rate at which it reacts to a (sudden) temperature change. In other words – temperature inertia of the sensor. Sensor temperature always lags behind the temperature of the media. Question: 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. Question: 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. Question: 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. Question: 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. Question: What does SPDT stands for?    Answer: Single Pole Double Throw refers to the type of the contact system. Question: 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. Question: 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. Question: When is it recommended to use a gold-plated contact system?    Answer: Gold plated contacts are particulary suitable for low voltage contol systems. Question: What is the key difference between KPS and CAS switches?    Answer: KPS is equipped with a contact system, and has adjustable differential. The CAS has a microswitch and differential is fixed, meaning differential value cannot be adjusted. Question: I have bought a sensor pocket for KPS temperature switch with the code no. 060L326266 but am missing accessories.    Answer: This code no. does not include the accessories gland, gasket and washer. The code no. 060L332666 includes the gasket set with the sensor pocket. Question: 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/ Question: I am looking for a Danfoss product, type USC6000, but cannot find it in your catalogues?    Answer: This product type was previously a part of Danfoss Analytics, and is now part of the company Hach Lange. Question: How can I improve the heat transfer if I use a sensor pocket with a temperature switch?    Answer: You can use heat conductive paste, available from Danfoss. Question: 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. Question: I am looking for a pump, type APP?    Answer: This product is marketed by Danfoss High-Pressure Systems (Nessie); please see contact options here: http://www.danfoss.com/BusinessAreas/High-Pressure+Systems/Nessie+Worldwide.htm Question: Can you explain the function and shape of the RT 102 thermostat's sensor?    Answer: The sensor of the RT 102 thermostat consists of 2 parts: A 2 m capillary tube, diameter 3 mm and 1.1 m capillary tube, diameter 4 mm, which is a "real" sensor with active carbon inside. The RT 102 with such sensor can be used for temperature measurement in a duct. It is important that the entire active carbon sensor (4 mm diameter) is in the duct. Question: 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. Question: Is it possible to change the set point in a pre-set KP temperature switch, e.g. from 35°C to 29°C?    Answer: It is possible to set the KP thermostat, but it is not possible to do it with this precision. Question: Why is there no information regarding scale correction in the technical brochure for a KP temperature switch?    Answer: Because the ambient temperature influence depends on 2 factors: 1) size of a sensor and length of the capillary tube, and 2) value of the ambient temperature. KP switches usually have smaller sensors than KPS switches, and they are installed in less severe conditions than KPS, so ambient temperature influence is very small and could be omitted. Question: I am looking for Danfoss MASSFLO and MAGFLO flow meters?    Answer: This product type was previously a part of Danfoss Flow Division, and is now part of the company Siemens. Question: I am looking for a Danfoss butterfly valve?    Answer: This product is marketed by Danfoss Water Controls; please see contact options here: http://www.danfoss.com/BusinessAreas/Water+Controls/ Question: 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. Question: Can you deliver your products wordwide?    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/ Question: 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. Question: 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. Question: 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. Question: 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. Question: 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 avaliable items. Question: 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. Question: 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 perfomance for our customers. Question: 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 Question: 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. Question: 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/ Question: Can you give me some key figures on danfoss?    Answer: If you are looking for number of employees, sales companies, turnover etc., you will find updated information here: http://www.danfoss.com/AboutUs/FactsAndFigures/ Question: 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. Question: Is Danfoss a German company?    Answer: No, it is a globally acting group with headquarters in Denmark. Question: I am looking for a hydraulic oil pump?    Answer: Hydraulic oil pumps are part of the product programme of the separate company Sauer-Danfoss. Question: 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. Question: Is there any way to tell if charge is lost in a temperature switch?    Answer: The only way is to test the temperature switch is by heating and cooling the sensor. Question: I am looking for a KP temperature switch for a small load: 10mA at 110V dc. Is it preferable to use gold contacts for this application?    Answer: Although amperage is quite low, standard silver contacts can be used because the voltage is high enough. If in doubt, the gold-plated contacts can be used. In cases where the load is too high, the golden layer will be burnt away and silver contacts will remain. A diagram showing when gold plated contacts shall be used is available in the technical brochure, downloadable from our internet catalogue. Question: Why is our delivery delayed, when I saw that the delivery date is confirmed for 2 weeks in e-commerce?    Answer: Reasons for late delivery could be production problems from Danfoss or incompliance with the payment terms from your side. You can always check the status of your order on our e-business system to see updated confirmation date or a message to contact Danfoss in case of late payment. Question: 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 Question: 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. Question: What do I need to know to select the right product?    Answer: The following are the basics for most products used in industrial environments: Application - Pressure - Temperature - Medium - Connection Question: Do Danfoss temperature switches come with sensor pocket included?    Answer: No, sensor pockets come in different sizes and material, and are therefore supplied seperately. Please see the Danfoss internet product catalogue for options. Question: Can I get quality control plans/process flowcharts/material specifications/FMEA for Danfoss products?    Answer: No, this is confidential information which cannot be shared outside Danfoss. Rare exceptions are cases of special legal agreements between Danfoss and the other company. Question: How do I maximize response time of a temperature switch?    Answer: First, the sensor should be immersed in the media with biggest possible surface. If this is not possible and a sensor pocket is needed, remember that the additional thermal inertia of the pocket will play a significant role. You can use heat conductive paste to reduce it. Question: What do I do if I need very quick reaction to changing temperature?    Answer: In case of any mechanical switch with charge sensor, the reaction time will always be a considerable factor. The solution could be using a temperature sensor, which has much smaller themal inertia. Question: What is the response time of Danfoss temperature switches?    Answer: There is no exact data on the time constant for temperature switches in particular - it largely depends on sensor charge, way of mounting (contact to media), temperature changing speed, ambient temperature and other factors. Question: 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 ia@danfoss.com, describing your interest and application. Question: 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. Question: Which temperature switch should I use to control the area temperature in an engine room?    Answer: The best temperature switch for this application is the RT 4, which features a room sensor element, a range from -5 to 30 °C and easy wall-mounting. Question: Can I download product approvals & certificate from the Danfoss websites?    Answer: Yes, in our internet product catalogue, all product approvals & certificates are listed. If you are unable to local a specific document, please e-mail or call us. Question: Can I order just the capillary tube for an AVTA?    Answer: Yes, you can order the complete thermostatic element for each type of AVTA. See or internet product catalogue for options. Question: Is it possible to buy just the contacts for the RT switches?    Answer: Yes, please see our internet product catalogue for options in spare parts & accessories. Question: Which media can Danfoss products be used with?    Answer: The answer depends on the materials in contact with medium for the particular product. This information can be found in the technical brochure / data sheet for the product. We have products designed specifically to handle particular media, including drinking water, oil, air, petrol, steam and more. If in doubt, please contact your nearest Danfoss office. Question: 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. Question: 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) Question: 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. © 2006 - Danfoss A/S All rights reserved. Use of this site signifies your agreement to the Terms of Use and Privacy Policy. Danfoss and the Danfoss logotype are registered trademarks of Danfoss A/S.