Temperature switches are generally used in industry for limiting temperature. They monitor the temperature of machinery and equipment and, for example, switch off machinery if it overheats or switch on a fan to cool the equipment.

Function
Bimetals form the basis of the WIKA TFS35 temperature switches. Temperature sensing is carried out by a bimetal disc, which snaps over when the nominal switching temperature (NST) is reached.

On cooling back down to the reset switching temperature (RST), the temperature switch returns to its original state.

The reset switching temperature is typically 15 ... 40 K below the switching temperature.

Contact design
The model TFS35 bimetal temperature switch can be delivered in two contact designs.

ANormallyClosed (NC= closed in the normal state) opens a circuit and shuts down the machinery.

ANormallyOpen (NO= open in the normal state) closes a circuit on reaching the switching temperature, in order that, for example, a fan or warning lamp can be switched on.

After cooling down below the reset switching temperature, the contact returns to the original state, so that the monitored equipment can again work normally.

These high-quality and robust temperature switches have been developed especially for safety-critical applications. The high quality and the manufacturing of the product ensures reliable monitoring of your plant. The manufacturer, Cella, is certified to ISO 9001. During production, the switch is followed, step by step, by quality control software and is thus 100 % tested.

All wetted parts materials are from stainless steel. Each switch family is available in a choice of IP 65, Ex-ia or Ex-d.

In order to ensure as flexible operation as possible, the temperature switches are equipped with micro switches, which make it possible to switch an electrical load of up to 15 A / AC 220 V directly. For smaller contact ratings, such as for PLC applications, Argon gas-filled micro switches with gold-plated contacts can be selected as an option.

With its flexible AISI 316 spiral protection hose, the model TCS temperature switch is extremely robust and guarantees optimal operating characteristics for applications requiring particularly high corrosion protection.

These high-quality temperature switches have been developed specifically for safety-critical applications. The high quality of the products and manufacturing in accordance with ISO 9001 ensure reliable monitoring of your plant. In production, the switches are traced by quality assurance software at every step and subsequently are 100 % tested. In order to ensure as flexible operation as possible, the temperature switches are equipped with micro switches, which enable the switching of an electrical load of up to AC 250 V, 20 A directly. For lower switching power ratings, such as for PLC applications, argon gas-filled micro switches with gold-plated contacts can be selected as an option.

The measuring element is a gas-actuated system with a bourdon tube element. This system allows wide setting range up to 0 ... 600°C. The measuring system parts and the flexible spiral armour are made of stainless steel. The model TAG temperature switch is extremely robust and guarantees optimal operating characteristics and the highest measuring performances with repeatability lower than 0.5% of span.

Award-winning in design and functionality
The successful design and the excellent functionality of the WIKA switch family were already confirmed by winning the "iF product design award 2009" for the PSD-30 pressure switch.

The robust LED display has been designed using 9 mm high characters (the largest possible) and with a slight incline in order to make reading the temperature as easy as possible from a long way off. A 14-segment display has been used, since it represents text very well.

The 3-key operation makes simple, intuitive menu navigation possible, with no need for additional assistance. The menu navigation is designed in accordance with the latest VDMA standard. The VDMA standard for fluid sensors (24574-2, part 2 temperature switches) has the aim of considerably simplifying the use of temperature switches by standardising menu navigation and display.

The control keys have been designed as large as possible and are arranged ergonomically to ensure fast and easy adjustments. Operation without any additional assistance is made easier through the tactile feedback.

Customised installation
The installation of the TSD-30 can be flexibly adapted to the individual mounting situation. Due to the almost unlimited rotation of the display and case by more than 300°, the display can be adjusted independently of the electrical connection. The display can thus always be aligned to face the operator, and the M12 x 1 connection positioned to suit the desired cable routing.

High quality
During development of the WIKA switch family a high value was placed on a robust design and the selection of appropriate materials suited to machine building applications. For this reason the case and the threaded connection of the electrical connector are made from stainless steel. Overwinding or tearing off the connector is therefore virtually impossible.

IO-Link
With the optional output signal in accordance with the IO-Link communication standard, the TSD-30 allows a fast integration into modern automation systems. IO-Link offers an even faster installation, parameterisation and higher functionality of the TSD-

These high-quality temperature switches have been developed especially for safety-critical applications. The high quality of the products and manufacturing in accordance with ISO 9001 ensure reliable monitoring of your plant. In production, the switches are traced by quality assurance software at every step and subsequently are 100 % tested. In order to ensure as flexible operation as possible, the temperature switches are fitted with micro switches, which enable the switching of an electrical load of up to AC 250 V, 5 A directly. For lower switching power ratings, such as for PLC applications, micro switches with gold-plated contacts can be selected as an option.

The measuring system parts and the flexible spiral armour are made of stainless steel. Moreover the snap-acting behaviour of the Belleville spring increases stability and vibration resistance. The model TXA temperature switch is extremely robust and guarantees optimal operating characteristics in a limited space with repeatability lower than 1 % of span.