For GWD100 type mine temperature sensors, temperature protection, temperature monitoring 
 I. Introduction 
 GWD100 temperature sensor (hereinafter referred to as sensors) is used to monitor the underground environment or the device operating temperature of the sensor can place to display the temperature of the measured value and the standard signal output for remote collection. The main pipeline gas temperature in the gas drainage system drainage shaft temperature, water temperature and other physical monitoring. 
 Second, the features 
 A digital temperature sensor, high measurement accuracy. 
 2 new single-chip microcomputer and highly integrated digital circuits, the circuit structure is simple, reliable performance, easy maintenance and debugging. 
 3 infrared remote control adjust the zero point, the sensitivity function, convenient and simple adjustment. 
 Using the new switching power supply, reducing the overall power consumption, increase the instrument transmission distance. 
 (5) to increase the fault self-test function, easy to use and maintain. 
 Design of the shell structure of the new high-strength, anti-out of the ability to increase the instrument. 
 Third, the applicable conditions 
 A. Ambient temperature: 0 ℃ ~ 40 ℃ 
 Two. Relative Humidity: ≤ 98% 
 3. Atmospheric pressure: 86kpa ~ 116kpa 
 Fourth, the main technical indicators 
 A. Measuring range: 0 ° C ~ 100 ° C 
 Two. The basic error: ± 2 ℃ 
 3. Display: four red LED display 
 4. Signal output: 200Hz ~ 1000Hz (or 1mA ~ 5mA) 
 5 of the safety parameters: Ui: DC ~ 18V.DC 
 Transmission distance: 2.0km (cable parameters: cross-sectional area: 1.5mm Resistance ≤ 12.8/km distribution inductance the ≤ 0.8Mh/km distributed capacitance ≤ 0.06uF/km). 
 Five, the shape characteristics 
 A. Case Material: Stainless Steel 
 Two. Shell color: metallic luster 
 3. Dimensions: 190 × 114 × 57mm 
 4. Weight: 1.7kg