Accessories - ACR Electronics SmartReader Plus Reference Manual

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SmartReader Plus Data Loggers

NOTE: When you activate either RH channel, you must also enable its

corresponding temperature channel, as well, in order to temperature compensate

the RH sensors.

Precautions

The SmartReader Plus 2's RH Sensor is designed for long-term trouble-free performance, but

there are a few precautions to keep in mind to maximize the benefit it can give you.

· Never expose the sensor to organic solvents or ionic-laden liquids. Any chemical

compound that attracts polymers may affect the sensor.

· The RH sensor is particularly susceptible to contamination by sulfur gases and sulfur

compounds. DO NOT SMOKE NEAR THE LOGGER!

· Always return your SmartReader Plus 2 to a re-sealable plastic bag during non-use to

maximize the in-calibration life of the RH sensor.

1.4.3

Accessories

You can obtain replacement RH Sensors, remote temperature probes, temperature and

relative humidity probes for use with your SmartReader Plus 2.

ET Series Temperature Sensors

The ET series of temperature sensors are thermistor probes that can be used easily with your

SmartReader Plus 2 for remote temperature measurements. The advantage of these probes

is that they can be used for a wide range of temperatures, are more versatile (they can be

used to record fluid temperatures) and their small size permits them to be easily inserted into

hard-to-get-at-locations (such as in ductwork or under pipe insulation).

To use an ET temperature probe with your SmartReader Plus 2 you must first enable the

logger's external temperature channel. Connect the remote temperature probe by attaching

one wire (of the two wire probe) to the channel marked Temperature and the other wire to the

terminal marked Common. For more information on ET series thermistor probes, refer to:

Appendix C Thermistor Temperature

EH-020A Temperature and Relative Humidity Probe

The EH-020A is a four-wire probe with a temperature and relative humidity sensor. For

field-mounting convenience, it also has a magnetic backing and a security eyelet. To use the

EH-020A with your SmartReader Plus 2, you must enable the logger's external temperature

and humidity channels. To connect the EH-020A probe to your SmartReader Plus 2, follow

instruction notes packed with each RH probe set -- see Figure 2-2.

Internal Temperature

Internal Relative Humidity

External Temperature

External Relative Humidity

Probes.

Appendix C

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