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Custom Sensor - MaxDetect Temperature and Humidity Sensor

  • Model: MQ3020
  • Range: variable, -20 - 80 C setting used in this example
  • Output: 4-20mA
  • Power: 24 volts
  • Accuracy: +-0.3 C, +-2% RH

A burden resistor is used to convert the current to a voltage.

   

 

Sensor Definition

 "MaxDetect Outdoor Temperature Sensor" : {
 "desc" : "MaxDetect MQ3020. 24V power, output 4-20mA. Jumpered for -20 to +80C.",
 "analog" : true,
 "rj45_v1" : true,
 "tblock_v1" : true,
 "pwr_volt" : 24,
 "rep_analog" : 1,
 "default_tag" : "temperature",
 "analog_tag" : "temperature",
 "conversion" : "-31.11+xyz*55.55",
 "unit" : "CELSIUS",
 "precision" : 3
 }