Smartreader Plus 7 Process Signal Logger; Description; Setup - ACR Electronics SmartReader Plus Reference Manual

1.10

SmartReader Plus 7 Process Signal Logger

A multi-channel, multi-purpose logger, the SmartReader Plus 7 provides a versatile means of
logging a wide variety of measurement signals. It features seven input channels configured
for easy interface with common transducer and transmitter outputs.
1.10.1

Description

The SmartReader Plus 7 can measure and record data from five separate channels of analog
DC voltage covering the ranges of 0 to 200 millivolts, 0 to 2.5 volts, 0 to 5 volts and 0 to 10
volts and from two DC current channels covering the range of 0 to 25 milliamps.
How the SmartReader Plus 7 Works
Voltage channels use a pre-amplifier to provide a high input impedance and adjust the signal
for maximum resolution by the A/D converter. All digital values are converted to their proper
engineering units by equations in TrendReader software.
Current flow through a loop is logged by measuring the voltage drop across an internal 20 ohm
input resistor. This voltage drop is amplified to use the full range of the A/D converter. The
digital values are then processed into engineering units by an equation in TrendReader
software.
1.10.2

Setup

This section provides guidelines to follow to get you started with your SmartReader Plus 7.
1. The first step in using your SmartReader Plus 7 is to decide what information, or
parameters, you want to log. For example, you may simply wish to replace an existing
hard-wired 4-20mA chart recorder or, instead, monitor from a special multiple-transducer
circuit that you have assembled.
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SmartReader Plus Data Logger
Figure 7-1: SmartReader Plus 7
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