Description
The TLMA is a temperature switch with a bimetallic trigger, manufacturer type Müller MKTL. It does not output a measured value but opens a contact as soon as the set temperature is reached.
It is designed as a limiter for machines and devices – for switching off or for switching on cooling in mobile hydraulics, engines, and compressors. It sits directly in the medium, screwed in with pipe or NPT threads, or threadless as an immersion switch: protective tube Ø 9 × 0.5 mm made of stainless steel, housing body also made of stainless steel and potted internally, system pressure up to 100 bar, vibration resistance up to 10 g, shock resistance up to 100 g, protection class at least IP 65 with the connector plugged in. The installation length ranges from 50 to 1000 mm according to the order code.
Because the bimetallic trigger operates without auxiliary energy, the switch requires neither a power supply nor evaluation electronics.
The switching element is a bimetallic trigger with 1 NC contact, creeping and without hysteresis. The switching point is between 5 … 200 °C and is selected in steps of 1 °C, the accuracy is ±5 K, with an option of ±3 K on request; the medium can be between 0 … +200 °C. The contact switches 12 VDC at 8 A or 24 VDC at 4 A, the contact surface is gold-plated, and the switching contact is silver. This switching capacity applies to 5,000 switching cycles at 100 °C and ohmic load.
Please note before ordering: The switching point is fixed at the factory, must be included in the order, and cannot be changed on-site – if you want to adjust it later, you will need a different device. The ambient temperature is not the medium temperature: The medium can be up to +200 °C, but the head only up to +85 °C. Below 0 °C, the product is not documented: medium, ambient, and storage temperatures all start at 0 °C. The permissible load depends on the chosen connector and is sometimes lower than the contact capacity – M12 eight-pin, for example, only 30 V and 2 A. The source only mentions "stainless steel" without a material number and specifies pressure, vibration, and shock values only dependent on the medium, temperature, installation position, and protective tube – these are maximum values, not a guarantee for every installation. A CE mark, explosion protection, and SIL or PL classification are not documented: as a safety limiter, the switch should only be used after your own assessment.
Advantages at a glance
- Bimetallic trigger, operates without auxiliary energy
- Switching point 5 … 200 °C in steps of 1 °C, accuracy ±5 K
- 1 NC contact, creeping, gold-plated contact surface
- Switching capacity 12 VDC 8 A or 24 VDC 4 A
- Protective tube Ø 9 × 0.5 mm made of stainless steel, system pressure up to 100 bar
- Installation length 50 to 1000 mm according to code, at least IP 65