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MT-305B（5 Kohm)

The ABB MT-305B (5 kΩ) is a passive, negative temperature coefficient (NTC) thermistor probe, designed for precise temperature measurement in various industrial and commercial applications. It functions as the sensing element within a temperature measurement system, typically connected to a separate transmitter, controller, or display unit that provides excitation current and converts the resistance change into a temperature reading.

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Typical Parameters Parameter Description / Typical Value Model / Type MT-305B - NTC Thermistor Probe Resistance Value 5 kΩ (Kilo-ohms) at a specified reference temperature (e.g., R₂₅ = 5kΩ @ 25°C). This is the most critical parameter. Beta Value (β) A specific constant (e.g., 3470K, 3950K) that defines the resistance-temperature curve/characteristic. Essential for accurate temperature calculation. Tolerance Resistance tolerance at reference temperature (e.g., ±1%, ±5%). Defines measurement accuracy. Temperature Range Operating Range: Typically -50°C to +150°C (common for epoxy-coated NTCs). Exact range depends on construction. Probe Material & Construction Stainless steel sheath, epoxy-coated bead, or glass-encapsulated. Determines response time and environmental durability. Lead Wires Insulated copper wires (e.g., PVC, Teflon), specified length. Time Constant The time required for the sensor to respond to 63.2% of a step change in temperature (e.g., a few seconds in air or liquid). Dissipation Constant The power required to raise the thermistor's temperature by 1°C above its surroundings (in mW/°C). Important for self-heating error consideration. Application Temperature sensing in HVAC controls, battery packs, electronic assemblies, industrial processes, and consumer appliances.