Testing, Troubleshooting, and Maintenance
8-2 CENTRON Meter Technical Reference Guide
pulse while the left LED will flash once for every 10Wh infrared pulses received.
The left LED on the pulse detector is helpful when heavier loads are present on the
system being examined. This can be used to verify that the metrology is measuring
energy when installed and to conduct timing tests to determine the amount of load
on meter.
Figure 8.2 Pulse Detector
Annunciators
Watthour Annunciators
C1SR meters (and some C1S versions) are equipped with LCD displays that utilize
a single flashing triangular annunciator to show that power is being metered. The
annunciator represents 1.0 watthour each time it turns on and 1.0 watthour each
time it turns off for a total of 2.0 watthours.
On other CENTRON meters equipped with LCD’s, there are three such
annunciators which also show the direction of energy flow (C1S, C1SC, C1SD,
C1ST, C1SL). The triangles will scroll left to right for positive (line to load) energy
flow, and right to left for negative energy flow.
The Kh value of the single triangle is twice the Kh of the LED and, therefore, 2.0
watthours per pulse. On the three triangle units the Kh of each triangle is further
multiplied by three as each triangle is turned on and off in sequence, resulting on a
Kh of 6.0.
TOU Rate Annunciators
The CENTRON meter is equipped with five Time-of-Use annunciators on the LCD
(see Figure 8.3). Located on the right side of the display, the annunciator A, B, C, D,
or TOTAL flashes when the applicable rate is active and is enabled to display their
respective values. (Available on the C1ST and C1SL.)
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