Landis+Gyr Cashpower Gem Lite, User Manual

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18/27 Review Meter Operation
© Gyr (Pty) Ltd Cashpower Gem Lite
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User Guide
4.9 Anti-tamper Features
4.9.1 General
The meter is mechanically sealed against tampering through the use of a factory sealed screw plug on the rear
panels and a utility-sealed wire seal on the front of the meter.
The use of these mechanical seals ensures that there are visible signs of tampering if unauthorised entry to the
system is attempted.
4.9.2 Anti-Tamper Switch
This tamper facility automatically detects if the terminal cover of the meter is removed. This condition will set the
tamper condition thereby opening the latching relay. A meter specific tamper reset token will be required to reset
this condition.
The Tamper Detection function may be enabled or disabled during production, or by means of a Set Options
Register token
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refer to paragraph 4.5.12

To check if the tamper facility is enabled or disabled refer to register 035,
refer to section
5.1.15 .
The tamper condition may be monitored by using the information functions

To check if a meter is tampered, refer to register 031, (section 5.1.13) , or
use the non meter specific token (
0000 0000 0022 8172 8512)
to display the
tamper state. A value of 1 displayed after the token has been accepted
means that the meter is tampered.
4.9.3 Reverse Energy Detection
The meter includes a Significant Reverse Energy (SRE) detection feature. If the line and load wires are
swapped during installation, the meter will continue to operate and decrement credit, however, the meter can be
factory-programmed to tamper and disconnect the load should SRE be detected.
The reverse energy condition may be monitored by using the information functions
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refer to section 5.1.13 and
5.1.15
4.9.4 Magnetic Tamper Detection
The meter incorporates a magnetic tamper detector. When the meter senses a magnetic field strength above a
pre-programmed threshold level, it disconnects the supply to the consumer.
As with the power limit trip condition, the magnetic tamper condition opens the internal latching relay for 30
seconds. Should magnetic interference be detected more than 5 times in a 15 minute window, the latching relay
will open for 30 minutes.

The Magnetic Tamper state may be monitored by viewing the register 037,
(press information button & then 037) refer to paragraph
5.1.17.
4.9.5 Resetting a Tamper Condition
Before resetting a tamper condition, care must be taken to remove the cause of the condition, e.g. ensure that
the tamper switch is closed. Failing to do this will cause an immediate tamper condition.
If a meter has been tampered, normal operation can only be restored by entering a clear tamper token.