User's Manual

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30 November 2006 1-3
REX Meter
Technical Manual 1 Introduction
Benefits
Reliability. The REX meter design is patterned after the ALPHA meter
technology which has established a reputation as a reliable and accurate meter
for electrical energy measurement. The highly selective choice of meter
components provides for a very reliable meter. The REX meter uses nonvolatile
electrically erasable programmable read only memory (EEPROM) to store its
customer-specific configuration parameters and all meter data. If power is
interrupted, the data will be preserved.
Maintainability. The design provides easy access to the meter circuit board
and all option boards. Circuit boards may be added or exchanged without
special tools or rewiring.
Adaptability. The REX meter is designed so that it may be easily upgraded to
support additional option boards. The REX meter has also been designed to
support an internal service control switch that can connect and disconnect
electrical service to a consumer. The service control switch must be specified at
the time of ordering.
Economy. The REX meter saves both time and money. It can increase
personnel productivity due to the following features:
■ no user calibration required (factory-calibrated)
■ reduced test time
■ LED test pulse output through the front of the meter
■ light weight for easy handling
Security. The REX meter is tamper-resistant. Since there are no moving parts,
traditional tampering techniques on the REX meter will be less successful than
on electromechanical meters. The REX meter is also a bidirectional meter. It
always measures kWh received as well as the selected energy quantity. A
polycarbonate cover resists cracking and breakage due to physical abuse. The
meter counts and stores the number of power failures, which can be used to
help detect tampering with the meter service.
Accuracy. The REX meter is a 0.5 % accuracy class meter (as defined by ANSI
C12.20) and meets or exceeds ANSI and IEEE requirements. The meter
precisely measures and displays energy usage consistently with the meter class
purchased and through a range of the following variations:
■ current
■ temperature
■ voltage
■ power factor
■ frequency
The low current sensor burden may also improve the accuracy of external
current transformers when measuring light loads.