ACR Electronics SmartReader Plus Manual do Utilizador descarregar pdf (Página 70)

SmartReader Data Loggers

1.12

Indoor Air Quality (IAQ) Logger

The Indoor Air Quality (IAQ) Logger, when combined with the Telaire 7001Handheld CO2

Monitor, records the three leading indicators of indoor air quality, which are temperature,

relative humidity, and carbon dioxide.

The IAQ Logger is a SmartReader data logger.

Figure 10-1: IAQ Logger

1.12.1 Description

The IAQ Logger has five channels; one internal temperature sensor, one internal RH sensor,

one CO2 sensor with an input range from 0 to 2.5VDC, and the remaining two for an optional

remote temperature and RH probe (EH-020A).

How It Works

The relative humidity sensor in the IAQ Logger is a processed plastic wafer. This wafer is

actually a laser-trimmed, capacitive thin-film relative humidity sensor.

Changes in relative humidity cause the surface capacitance of the polymer film to vary. The

IAQ Logger gauges this capacitance by passing a small electric current through it and

measuring the relative voltage drop. Because the response of the sensor is temperature

dependent, a temperature reading is always taken at the same time as the humidity reading.

That way, when the logger's information is backed up into your computer, TrendReader

software can automatically factor in the right compensation values when it calculates the

percentage of Relative Humidity (in % RH). The result is an accurate set of

automatically-generated and temperature-compensated relative humidity readings.

1.12.2 Setup

Make sure to enable each channel you want to use. If you are not using a channel, disable it

to save logger memory.

Channel

Description

Equation

Internal Temperature

Internal Relative Humidity

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 102 103

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ACR Electronics SmartReader Plus Manual do Utilizador Página 70