T-200A Air Temperature Sensor

The T-200A is a 100 Ohm platinum based RTD, designed for accurate wide range temperature measurements outside the range of the thermistor probes. Met One Instruments’ temperature sensors are precision, extended-range thermistor devices that accurately measures ambient air temperature in field settings.

This precise performance is a benefit of the sensors’ high resistance sensitivity, which eliminates problems associated with line lead length, noisy environments, and poor connections.


The solid-state, multi-element thermistor devices produce a relatively large resistance change per degree of temperature change, allowing the use of normal signal voltages without self-heating of the sensor. When used with signal conditioning modules, the resultant output is a precise analog voltage.


  • Rapid response time; 10 seconds in still air
  • Calibration traceable to NIST
  • Interchangeable without recalibration
  • High resistance values to minimize signal line resistance
  • ‘Free air’ suspension of thermistor bead


Time constant:45 sec, approx. in moving air

Temperature: -50° to +50° C (-58 to +122° F)
Optional Calibrations: -50°C to +70°C or -40°C to +60°C
(-58°F to +158°F or -40°F to +140°F)
Sensitivity: Alpha 0.00385 +/- 0.00002 Ohm/ohm/deg C
Nominal Resistance: 100 ohm +/- 0.1 ohm resistance (Ro)
Time constant: 45 sec, approx. in moving air
Accuracy: +/- 0.1°C (0.18°F)
Configuration: 4 Wire Connection
Connection: 8” pigtails (for use with 076B Radiation Shield)

Specifications are subject to change at any time