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Operation: C12.19 C1SD, C1ST, and C1SL Versions
58 CENTRON® Meter Technical Reference Guide
Interval Lengths
The load profile records data on a block interval basis. The interval length is programmable:
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, or 60 minutes. The default is 15 minutes. This interval
length is independent of the interval length chosen for displayed demand quantities.
Power Outage
The C12.19 C1SL module can flag an interval when a power outage exceeds a specified
number of seconds. The power outage duration is programmable from 0 to 255 seconds.
The default is 60 seconds.
Channel Configurations
The Load Profile register has up to eight channels of load profile interval data. The pulse
constant is programmable from 0.01 to 1000.00 watthours per pulse in 0.01 increments. This
pulse constant applies to secondary readings only. For example, a watthour pulse constant of
1.8 corresponds to 1.8 watthours per pulse.
Some example pulse weight calculations:
Example 1: Calculation of Pulse Weight
If the customer pulls a 240V, CL200, singlephase, Form 2S electromechanical meter from
service, with the following:
Meter Kh = 7.2 watthours/disk revolution
Pulse Initiator = 4 pulses/disk, revolution
then this electromechanical meter has the following pulse weight (PW):
PW = Kh/PDR = (7.2 watt hours per disk revolution) / (4 pulses per disk revolution)
PW = 1.8 watt hours per pulse
If this meter is replaced by a Load Profile register of the same form number, voltage and
current ratings, and if the utility wants the register to operate the same way, the pulse weight
would be entered in the customer files as 1.8 watthours per pulse.
Example 2: Calculation of Pulse Weight
A Load Profile register on a singlephase, 240V, CL200, meter is programmed so that kWh
is recorded into mass memory. The maximum 16-bit data resolution is desired for 15 minute
intervals.
First, calculate the maximum watthour accumulation during 15 minutes intervals:
Wh, Max = 240 V X 200 A X Iphase X 0.25
Wh, Max = 12,000 watt hours