Apogee Instruments TS-220 소유자 매뉴얼 - 페이지 12

{카테고리_이름} Apogee Instruments TS-220에 대한 소유자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Apogee Instruments TS-220 20 페이지. Fan-aspirated radiation shield

OPERATION AND MEASUREMENT

Connect the temperature sensor or RH probe sensor to a measurement device (meter, datalogger, controller). If

you are using the ST-110, this device must be 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). 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 24 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.

The following instructions are for the ST-110 thermistor included with the TS-210 option. For wiring other sensors,

including PRT sensors, please see their respective manuals.

Wiring for ST-110

White: Single-ended channel (positive thermistor

lead)

Red: Excitation channel (excitation for thermistor)

Black: Ground (negative thermistor lead)

Clear: Shield/Ground