Apogee TS-100 Gebruikershandleiding - Pagina 11

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OPERATION AND MEASUREMENT

Connect the sensor to a measurement device (meter, datalogger, controller) capable of inputting 2.5 V

DC, and measuring and displaying or recording a millivolt (mV) signal (an input measurement range of 0-

2500 mV is required to cover the entire temperature range of the ST-110 air temperature sensor). In order

to maximize measurement resolution and signal-to-noise ratio, the input range of the measurement

device should closely match the output range of the sensor.

Connect the fan to a 12 V DC power supply capable of supplying at least 80 mA. If the datalogger has the

capability for pulse width modulation (PWM) it can be used to reduce fan speed at night or under

conditions of low solar radiation and/or high wind speed. The datalogger or controller must have a pulse

width modulation (PWM) output of approximately 20 kHz and a duty cycle of 50 to 100 %.

The tachometer output is measured by a pulse counter. The tachometer also requires an input voltage,

where maximum voltage output to the pulse counter is the input voltage to the counter. The tachometer

output allows monitoring of the fan to ensure it is functioning properly.

Plug each wire into the appropriate data logger terminal following the illustrations below:

Thermistor:

Measurement devices (e.g., datalogger, controller) do not measure resistance directly, but determine

resistance from a half-bridge measurement, where an excitation voltage is input across the thermistor and

an output voltage is measured across the bridge resistor.