Description
The TBMB is a sheathed thermocouple with GL type approval.
It is designed for systems where the sensor must have type approval from Germanischer Lloyd: GL TAA00002H3. Technically, it is the sensor of the TBMA, but more narrowly defined – the nominal length is limited to 200 mm, and the connection cable to 6 m. The sheath remains flexible with a minimum bending radius of 5 × Ø protection tube, reaching installation locations that a rigid protection tube cannot; the cable is firmly attached to the sensor, eliminating the need for a connection head. Protection tube 2.4816 (Inconel 600) and connection sleeve 1.4571 (316Ti) provide IP 65 up to 250 °C.
Diameters and wall thicknesses are specified as 1.9×0.2, 3×0.25, 4.5×0.36, and 6×0.51 mm, with a standard nominal length of 100 mm. Connection is made via open ends or via TE connectors in standard or mini form; five cable types from PVC to glass fiber are available. Clamp fittings and sheet metal flanges from the accessories are used for fastening.
The measuring element is a thermocouple Type J (Fe-CuNi) or Type K (NiCr-Ni), insulated in metal oxide. 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: ±1.5 °C in the range -40 … 375 °C, and above that ±0.004|t|. The sensor outputs the thermovoltage directly and has no transmitter; the insulation is tested with 500 VDC.
Note before ordering: The approval is proven by a mark and number, not by a certificate; the certificate should be requested before any assurance is given to the classification society. The operating range is determined by the cable, not the sensor: PVC ends at +70 °C, silicone at +180 °C, PTFE at +250 °C, glass fiber at +550 °C; for PTFE, the sister sheets state +205 °C. IP 65 does not apply to the version with braided shield. Terminal assignment, process connection, system pressure, weight and response time are available on request. A declaration of conformity is available on request. Explosion protection is not documented. The version without approval, with a nominal length of 2000 mm, is the TBMA.
Advantages at a glance
- Type approval GL TAA00002H3 proven by mark and number
- Thermocouple Type J or Type K, -200 … +1000 °C
- Limit deviation Class 1 according to DIN EN 60584-2, ±1.5 °C from -40 °C
- Flexible sheath, bending radius min. 5 × Ø protection tube
- Four diameters with wall thickness: 1.9×0.2 to 6×0.51 mm
- Nominal length 100 mm as standard, maximum 200 mm
- Protection tube 2.4816 (Inconel 600), connection cable maximum 6 m