SM150T User Manual 1.0 Operation 18Other Data LoggersConnectionSM150T wiringDescriptionWirecolourLogger connectionDifferential connection is preferredPower 0V(Power return andthermistor return)brown Power ground/OVPower return OVPower V+(Power supplyvoltage)white Sensor Power/V+5-14 VDC, 18 mA, for 0.5 to 1sSignal HI(Volumetric watermeasurementsignal)blueDifferential in+/IN+OrSignal Input (on single ended loggers)0-1V ≈ 0 to 60% vol nominal ±3.0%(±3% vol over 0 to 70% vol and 0-60°C)(±5% vol over 100 to 1000mS.m-1 and 0-60% vol)0-1.5V ≈0 to 100%vol(Reduced accuracy especially at 100%)See look-up tables and polynomialsSignal LO(Volumetric watercontent return)blackDifferential in-/IN-Or0V (On single-ended loggers)Temperature +(Thermistorconnection)greyResitance measurement channel10 K thermistor, ±0.5⁰C over 0-40°C(5.8kΩ to 28kΩ - See Resistance Lookuptable)Cable shield(Noise shield) greenLow noise 0v (sensor 0v)(Can use power 0V if sensor 0V notavailable)