Description
The TKMB is a thermocouple with connection head B in the GL type-approved version, manufacturer type Müller TE-MR1G.
It is designed for fixed plant installation at measuring points where type approval is required: The manufacturer's sheet lists the GL mark with the number TAA00002H3. The aluminum connection head accommodates a ceramic base with connection posts. The process connection M24x1.5 and the cable gland M20x1.5 are located on the head, and the protection class is IP 54. The protection tube made of 1.4571 (316Ti) or 2.4816 (Inconel 600) withstands temperatures up to 600 °C or 1100 °C respectively, and the process pressure is max. PN16.
Compared to the TKMA, this is not the same product with an additional marking: This version is limited to a length of 200 mm instead of 2000 mm and has a different accessory set. The source does not list a transmitter here as an accessory, but it does include connection cables up to 6 m, compression fittings, and a sheet metal flange. Screw-in (ES) and immersion (ET) designs are available, as well as protection tube diameters of 3 to 15 mm; the selection is limited for mineral insulated elements and in the immersion design.
The measuring element is a Type J (Fe-CuNi) or Type K (NiCr-Ni) thermocouple, single or double, as a standard element or as a mineral insulated element. The operating range for Type J is from -200 ... +700 °C, and for Type K from -200 ... +1000 °C; the limit deviation follows DIN EN 60584-2 Class 1 with ±1.5 °C from -40 ... 375 °C and ±0.004|t| above. The thermovoltage is available at the ceramic base in the head, the test voltage is 500 VDC, and the response time on the 3x0.4 mm tube is t90 6 s.
Please note before ordering: The approval is documented as a mark and number, not as a certificate – the manufacturer's sheet does not mention a certifying body, and the certificate is not available; it should be requested before any assurance. Both bear the product identification KC, distinguished solely by the first digit of the order code: 4 ... 7 for the TKMB, 0 ... 3 for the TKMA – the English version prints 0 ... 3 for the GL variant here, which would make it unorderable unnoticed. The ambient temperature is not the medium temperature: The head is limited to 480 °C, the measuring element reaches up to 1000 °C. The source states 15 s for the 6x0.5 mm tube here, while the TKMA sheet states 30.9 s – it does not explain the difference. IP 54 applies only to the connection head; terminal assignment, CE mark, and explosion protection are not documented.
Advantages at a glance
- GL type approval TAA00002H3, documented as a mark and number
- Thermocouple Type J or Type K, single or double
- Operating range Type J -200 ... +700 °C, Type K -200 ... +1000 °C
- Process pressure max. PN16, installation lengths 50 to 200 mm
- Aluminum connection head B, IP 54, cable gland M20x1.5
- Protection tube 1.4571 or 2.4816, Ø 3 to 15 mm
- Version without GL up to 2000 mm length available as TKMA