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ACR Systems OWL 100 Manual
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Contents
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OWL Data Loggers26© 2001 ... ACR Sy stems Inc.6 OWL 20 mA Data LoggerFeaturesThe OWL 20mA Current Data Logger provides a versatile means of recording a process signal in asmall, water-resistant enclosure. It is made to connect to 4-20mA type transmitter current loops.6.1 DescriptionThe 20mA Current Logger measures and records analog 0 to 24mA signals common in processcontrol and instrumentation environments. The model available is the OWL-500.How it WorksCurrent flow through a loop is logged by measuring the voltage drop across an internal 100 ohm inputresistor. This voltage drop is accurately gauged by comparing it to a highly-stable voltage referencebefore conversion to a digital value by the A/D converter. The digital values are then processed into 0to 24mA values by an equation in TrendReader Software.6.2 Setup and UseThis section provides guidelines to follow to get started with the OWL 20mA Current Logger.1. Connect the cable supplied into the current loop being measured - see Figure 5-12. Run TrendReader Software and communicate with the logger by double clicking on the com porticon and pointing the flashing wand at the logger's optical port. Once the Status menu is displayedselect the Setup option - see Fig. 5-2A3. Make sure the 20mA Current equation is chosen (#205 in DOS).4. To start the logging session, point the wand at the logger then select Send Setup. |
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