MB series RTD sensors

The choice depends on the resistance level, TCR curve and tolerance class required by the measurement circuit. Standard MB219 variants are available as Pt100 or Pt1000 with a 3850 ppm/K coefficient and class F 0.3 (B), while the MB219 TCR 3750 is a Pt1000 device with class F 0.6 (2B). Pt100 is specified for a measuring current of 0.3 to 1 mA, whereas both Pt1000 versions use 0.1 to 0.3 mA. The higher nominal resistance can produce a larger signal voltage at the same excitation current, but the analogue front end must match the selected resistance and curve. The 3750 and 3850 ppm/K variants should not be interchanged without updating the conversion coefficients or calibration.

Keep the excitation current within the specified range and calculate the resulting sensor power at the resistance expected during operation. The self-heating figure is 0.4 K/mW at 0 °C, so dissipation can be estimated using P = I²R. At 0 °C, a Pt100 element at 1 mA dissipates 0.1 mW, corresponding to approximately 0.04 K under the stated condition; a Pt1000 element at 0.3 mA dissipates 0.09 mW, or approximately 0.036 K. These are calculated reference values rather than guaranteed system errors because thermal coupling and airflow affect the resulting temperature rise. Use the lowest current that provides an adequate signal-to-noise ratio and verify the assembled sensor under representative conditions.

No, the declared tolerance class is valid for continuous operation from -70 °C to +500 °C. Exposure up to +550 °C is identified as temporary, but a duration and tolerance class at that temperature are not defined, so it should not be treated as an indefinite operating point. For long-term stability, R₀ drift after 1,000 hours in air at the upper declared continuous limit does not exceed the tolerance of the applicable class. The sensor body may tolerate the stated range while joints, cable insulation, potting materials and probe hardware impose lower limits. Set the complete assembly rating according to its least temperature-resistant component and qualify any excursion above +500 °C separately.

The component is rated for at least 40 g acceleration over a vibration range of 10 to 2,000 Hz. Its shock rating is at least 100 g with an 8 ms half-sine pulse, while the nickel-wire leads have a tensile-strength rating of at least 8 N. Both vibration and shock performance depend on the way the element is installed, so these values should not be treated as unconditional ratings for a finished probe. Unsupported leads, rigid joints and local stress at the sensor body can alter the result within the complete assembly. Validate the mounted sensor using the vibration, shock and thermal-cycling profiles that apply to the final equipment.

The nickel-wire leads are intended for brazing, welding or crimping. Conventional soldering is not included among the specified connection methods, so it should not be assumed suitable without a separately qualified process. The standard lead length is 7 mm ±1 mm, giving the assembly process limited space for joining and strain relief. Choose the connection method according to the joint geometry, process temperature and mechanical loading, then verify resistance shift and joint integrity after assembly. Alternative wire lengths and resistance values may be requested when the standard construction does not suit the intended probe design.

Response depends strongly on the surrounding medium, its flow rate and the thermal mass added by the finished assembly. In water moving at 0.4 m/s, the specified values are t0.5 = 0.05 seconds and t0.9 = 0.15 seconds. In air moving at 2 m/s, the corresponding values are 3 seconds and 10 seconds. The t0.5 and t0.9 figures indicate the time required to reach 50% and 90% of the final response after a temperature change. A sleeve, adhesive, potting compound or thick probe wall can increase these times, so control-loop calculations should use measurements from the complete installed sensor.

The MB219 range may be considered for automotive use, but the standard catalogue variants should not automatically be treated as automotive-qualified components. Additional project requirements, including IMDS or PPAP documentation, can be evaluated as part of the selection process. No AEC-Q200 qualification is stated for the listed variants, and the vibration and shock ratings remain dependent on installation. Engineers should therefore review the complete environmental, traceability and documentation requirements rather than relying on the temperature range alone. Confirm the required deliverables and component status before releasing the sensor for an automotive production design.