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To identify the right temperature sensor for a system, there are a few key questions whose answers will point to the right solution quickly. How is temperature measured in the system today? If a thermocouple or RTD is the existing solution, it’s likely that the needed temperature range is very wide. If a thermocouple or RTD is presently being used, but the operating temperature range is between about -50°C and 150°C, an LMT analog temperature sensor could be a viable option. If an NTC thermistor or temperature sensor IC is used, LMT temperature sensors can provide the best value for performance. What operating temperature range is needed? Some systems need a wide operating temperature range even when action is only taken in a narrower range of temperatures. For example, a system may start-up cold but need to take action at hotter temperatures. The thermal management device must be active from start up. In what range of temperature must action be taken, or accuracy be greatest? As with the above example, the system might require temperature to be monitored closely within +/- 30°C of their normal operating temperature but need a wider sensor operating range.Within this special range, what accuracy is needed? To determine the requirements for this characteristic, identify the temperature error for which a certain system behavior is acceptable, or action may be performed. What operating voltage will be available for the temp sensor? This supply might be provided by a voltage reference, regulator, or battery. Answering these key questions enables quick identification of the right temperature sensor for an application or system.
