ACR Electronics SmartReader Plus Instrukcja Użytkownika Pobierz pdf (Strona 73)

SmartReader Data Logger

within a small, confined area. The individual sensors associated with your IAQ Logger

measure and record temperature and RH only in one location. They do not, in any way,

represent an overall reading.

If you decide to check the calibration of your IAQ Logger RH Module using a Sling

Psychrometer, keep in mind the following:

· Any instrument that requires a person to be present at, or in very close proximity to the

RH sensor in order to get a reading, will have a measurement error introduced to it.

That is because the body readily gives off heat and moisture that is especially

noticeable at lower RH levels.

· The time taken between slinging the psychrometer and reading it can exhibit several

degrees of inaccuracy in the wet bulb reading. Air currents around the body, whether it

is slung in the shade of a building or in sunlight, not knowing how to tie the wet sock, its

condition, and the purity of water used, all contribute to error. In addition, interpolating

the data from a psychrometric chart can add another 2 to 4% to the accumulative error.

For accurate CO2 sensor readings when using the IAQ Logger in conjunction with a Telaire

7001, make sure that the Telaire 7001 is set with the correct altitude/elevation setting for your

locale. The factory default for the Telaire's CO2 sensor is zero, for elevations higher than 500

feet, an adjustment should be made to ensure optimum sensor readings.

1.12.5 Relative Humidity Calibration

Each relative humidity sensor has been individually calibrated in an environmental chamber

with standards traceable to the National Institute of Standards and Technology (NIST).

The IAQ Logger and the EH-020A probe are supplied with a calibration certificate which

provides calibration values. These calibration values must be entered in and stored in the

logger during initial setup. If your RH sensor is out of calibration, you can simply replace it with

a new one.

NOTE: A straight replacement of the RH sensor will introduce an additional +2%

tolerance on the RH accuracy. Calibration of the RH channel with the new RH

sensor is recommended.

In the event that you wish to confirm the RH calibration of your sensor, you can perform your

own field test. Refer to Appendix B Temperature and Relative Humidity Calibrations for more

information on RH testing.

Interchangeable replacement RH sensors for loggers are available through your dealer. For

best accuracy, it is recommended these be calibrated together with the logger - consult your

ACR representative for price and availability of this service. Replacement EH-020A modules

which are pre-calibrated are available through your dealer.

1.12.6 Specifications

Temperature Sensor (in IAQ logger)

Type: NTC Thermistor

Range: -40 to 70°C (-40 to 158°F)

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 102 103

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ACR Electronics SmartReader Plus Instrukcja Użytkownika Strona 73