Apogee Instruments TS-210 Benutzerhandbuch - Seite 18

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Operation of the EE08 requires a voltage input of 7 to 30 V DC. Measurement of the output signals requires a

single-ended voltage measurement over a range of 0 to 2.5 V DC. A compatible measurement device should have

the capability to supply and measure these voltages.

The sensitivity of the air temperature sensor (voltage output from sensor per degree C) is 20.8 mV per C (reciprocal

of the slop listed in the OPERATION AND MEASUREMENT section). This means a voltage measurement resolution

of 2.08 mV is required to yield an air temperature measurement resolution of 0.1 C, and 0.208 mV is required to

yield an air temperature measurement resolution of 0.01 C. The sensitivity of the relative humidity sensor (voltage

output from sensor per % RH) is 25 mV per % (reciprocal of the slope listed in the OPERATION AND

MEASUREMENT section). This means a voltage measurement resolution of 2.5 mV is required to yield a relative

humidity measurement resolution of 0.1 % C, and 0.25 mV is required to yield a relative humidity measurement

resolution of 0.01 %.

An example datalogger program for Campbell Scientific dataloggers can be found on the Apogee webpage at:

https://www.apogeeinstruments.com/content/EplusE-EE08-Temp-RH-Probe.CR1

Effect of Cable Length & Modifying Cable Length

When the temperature sensor is connected to a measurement device with high input impedance, sensor output

signals are not changed by shortening the cable or splicing on additional cable in the field. Tests have shown that if

the input impedance of the measurements device is 1 mega-ohm or higher then there is negligible effect on the

sensors, even after adding up to 100 m of cable. TS-200 aspirated radiation shields use shielded, twisted pair cable,

which minimizes electromagnetic interference. This is particularly important for long lead lengths in

electromagnetically noisy environments.

Standard Apogee cable lengths for the EE08 are 5 m, 10 m, and 20 m. If a length greater than 20 m is required,

additional cable can be spliced onto a standard cable. For cable extensions, shielded, twisted-pair cable is

recommended, to minimize electromagnetic interference. This is particularly important for long lead lengths in

electromagnetically noisy environments. However, additional cable adds resistance and may influence the

accuracy of the measurement.

See Apogee webpage for details on how to extend sensor cable length

(http://www.apogeeinstruments.com/how-

to-make-a-weatherproof-cable-splice/).