ACR Electronics SmartReader Plus Bedienungsanleitung PDF herunterladen (Seite 47)

SmartReader Data Logger

you must activate the battery switch (see External Battery Control).

Figure 7-3: Using Transducers with a Battery

6. Connect your transducers or transmitters and check operation by observing the Realtime

values displayed by TrendReader software. If you can, try to exercise your transducers

(make them change their output) to ensure that everything works. If it does, then you are

ready to place your assembly in the field to start logging.

Avoiding Ground Loop Problems

Take special care to avoid ground loop problems when you use your SmartReader 7. A

ground loop can occur when there is more than one path to ground in your logger-transducer

circuit. Ground loops can damage your SmartReader 7 as well as your transducers. To avoid

ground loop problems in your SmartReader 7 circuit:

1. Do not use more than one grounded power supply to excite your transducers.

2. Do not connect your logger to your computer for Realtime readings unless:

· your computer is battery-operated (i.e. not grounded); or

· your transducer power supply is not grounded.

If you must use more than one grounded power supply in your SmartReader 7 circuit, each

transducer you use must be isolated. If you must use non-isolated transducers, then you must

use a Signal Repeater/Loop Isolator between the transducer output and the SmartReader 7

input.

Wiring Notes and Considerations

1. The SmartReader 7 has two common inputs (labeled " - Common"). These are not

isolated from each other and can be used as the negative "-" connection for the power

supply (or battery) and any of the transducers being logged by the SmartReader 7.

2. The 2.5V and 200mV channels "float" when no connections are made to them. They can

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ACR Electronics SmartReader Plus Bedienungsanleitung Seite 47