Meter Accuracy; Meter Case; Over Voltage Operation; Import Active Registration - Elster A1140 User Manual

6.5

Meter Accuracy

The A1120/40 meter measures active energy, in accordance with the requirements of -
EN 62053-21/22 for indoor kWh meters of protective Class II and accuracy Class 0.5s, 1 or 2,
EC Directive 2004/22/EC (MID) - Class A, B or C
The design of the meter ensures life long stability. There are no on-site adjustments.
The meter measures reactive energy in accordance of the requirements of EN 62053-23 for kvarh
meters for reactive energy Class 2 or Class 3.
Typical accuracy curves are shown in Figure 4.
6.6

Meter Case

The case is double insulated to protective Class II.
The case provides an ingress protection rating of IP53 in accordance with IEC 60529:1989.
The base is light beige coloured polycarbonate.
A separate phenolic terminal block conforms to DIN 43857 Part 2 and 4.
The extended terminal cover is moulded in light beige coloured polycarbonate.
An option with a cut-out is available.
The main cover is moulded in tinted, clear polycarbonate.
Figure 6 illustrates the outline and fixing dimensions.
The main cover is secured by two sealable screws. Two separate sealable screws secure the terminal
cover.
The terminal cover plate protects the meter main terminals.
An optional main cover prevents access to the voltage disconnect links (See Figure 5)
A holder for a module/battery that attaches to the base under the terminal cover is available as an
option.
7

OVER VOLTAGE OPERATION

The meter has been designed to withstand a phase - neutral voltage of √3 x 1.1 Uref (i.e. 440V
for 230V meters) for an indefinite period. When tested over a 12 hour duration the change in
meter error was less than 0.4%.
8

IMPORT ACTIVE REGISTRATION

Import Active registration can be configured at manufacture to one of the following:
Import Active Units Only – Import Active Units measures the sum of all phases, when the total
system flow is positive.
Positive (kWh [L
Power Flow Insensitive Mode - Power Flow Insensitive Mode allows the meter to increment its
main kWh register regardless of whether the system energy flow is import or export.
│(kWh [L ] + kWh [L
1
] + kWh [L ] + kWh [L
1 2
] + kWh [L ])│
2 3
Operating & Maintenance Instructions
])
3
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