ACR Electronics SmartReader Plus Manual de usuario descargar pdf (Pagina 45)

SmartReader Data Logger

1.9

SmartReader 7 Process Signal Logger

A multi-channel, multi-purpose logger, the SmartReader 7 provides a versatile means of

logging a wide variety of measurement parameters. It features seven input channels

configured for easy interface with common transducer and transmitter outputs.

Figure 7-1: SmartReader 7

1.9.1 Description

The SmartReader 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 7 Works

The 200 mV channel uses a pre-amplifier to magnify the signal ten times for maximum

resolution by the A/D converter. The 5 and 10 volt channels are converted to a 0 to 2.5 volt

signal by internal resistive divider circuits. 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 100

ohm input resistor. This voltage drop is accurately gauged by comparing it to a highly-stable

voltage reference before conversion to a digital value by the A/D converter. The digital values

are then processed into engineering units by an equation in TrendReader software.

1.9.2 Setup

This section provides guidelines to follow to get you started with your SmartReader 7.

1. The first step in using your SmartReader 7 is to decide what information, or parameters,

you want to log. For example, you may simply wish to replace an existing hard-wired

4-20 mA chart recorder or, instead, monitor from a special multiple-transducer circuit that

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ACR Electronics SmartReader Plus Manual de usuario Pagina 45