Figure 1. HMT140 components diagram 1 CONFIG header 2 SERVICE button 3 Infrared sensor 4 Status LED 5 LCD 6 Power switch for battery 7 Cable grommet (rubber plug) 8 Cable gland 9 Channel wire terminals Figure 2. RTD wiring diagram Figure 3. RTD and Boolean wiring diagram Figure 4. Boolean wiring diagram Figure 5. Voltage wiring diagram Figure 6. Current wiring diagram