Operation: CP1SR Version
28
CENTRON® Polyphase Meter Technical Reference Guide
FCC Regulations
The CP1SR communicates in the unlicensed, 910-920 MHz band governed by the US Code
of Federal Regulations (CFR) Title 47, Part 15 Radio Frequency Devices, Sub Part C
Paragraph 249 Intentional Radiator.
Changes or modifications not expressly approved by
Itron could void the users authority to operate the
equipment.
Tamper Detection
The CENTRON Polyphase CP1SR features the Itron patented method of tamper detection
that senses both meter removal and meter inversion. The removal tamper (RTPR)
increments a counter each time the meter is abruptly removed from a live meter socket. The
tamper counter utilizes a tilt switch to detect when the meter is removed from a meter
socket.
Testing the CENTRON CP1SR Tamper Counter
SCM Testing
In order to test the power removal counter, the meter must sense a shaken condition
associated with a power outage.
1
Place the meter in a socket.
2
Apply power to the meter.
3
Remove the meter from the live socket.
4
Replace the meter in the socket.
The meter has incremented the removal tamper counter.
The CP1SR uses the power outage (the meter being removed from a live socket) in
conjunction with the meter being shaken simultaneously to increment the power removal
counter.
The inversion counter increments when the meter senses reverse current flow. The
metrology board senses reverse power flow and sends this status to the CP1SR personality
module. The CP1SR then increments the counter and transmits the count.
As part of the 96-bit Standard Consumption Message, 4 bits are allocated for tamper
indications, which include the power removal and meter inversion counters. The ReadOne®
Pro handheld reader converts the 4 bit binary number to its equivalent value between 0 and
15. The table below shows the removal and inversion information based on the reported
tamper count. For example, a tamper count of 6 on the ReadOne Pro would translate as 1
meter removal and 2 meter inversions since the last read.
