ACR Electronics SmartReader Plus Bedienungsanleitung PDF herunterladen (Seite 75)

SmartReader Data Logger

1.13

APPENDIX A Measuring Resistance and Switch Status

Monitoring Resistance

and Switch Status

1.13.1 Measuring Resistance

You can also use your SmartReader 1, 2, 4 or 8 model loggers to monitor resistance, instead

of just temperature. This capability allows you to monitor devices other than just thermistors

(for example, potentiometers, level indicators, or any other device that varies resistance in

accordance with a known parameter).

To use the thermistor temperature channel on your SmartReader data logger to measure

resistance, you must change the channel's equation number to the one for resistance. To do

this, choose Equation 44 - Resistance when setting up the logger in TrendReader software.

The highest resolution of the resistance measurements occurs at a 10k ohms midpoint.

1.13.2 Monitoring the Status of Switches

You can also use your SmartReader 1, 2, 4 or 8 model loggers to record the status of

uncommitted mechanical switch contacts (see Figure A-1). The switch you want to monitor

must be a "dry" contact, which means that it must have no connection to any type of voltage,

power or ground.

To use the thermistor temperature channel on your SmartReader data logger to monitor switch

status, you must change the channel's equation number to the one for switch status. To do

this, choose Equation 41 - Switch Status when setting up the logger using TrendReader

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ACR Electronics SmartReader Plus Bedienungsanleitung Seite 75