User's Manual

Chapter 1: System Overview 11
Powering
The unit is powered from the 240VAC line or through the battery connector with five
to12-volts or both simultaneously. The current from the AC line has been limited to about
4 milliamps for safety considerations. Beware that the unit is not grounded, but is floating
at the AC line potential. DO NOT TOUCH the electronics when connected to 240VAC.
Also be aware that the resistors that connect to the AC line do heat up. Typically, a 1/4 to
1/2 watt is being dissipated continuously.
Electric FIREFLY Specifications
Functional
Meter reading 9 digit 99,999,999.9 watt-hours, 0.1 watt-hour units; tracks
mechanical register—forward and reverse.
Reverse meter reading 9 digits 99,999,999.9 watt-hours, 0.1 watt-hour units
cumulative reverse consumption.
Meter constant User configurable, 0.1 watt-hour revolution. Typically 7.2
watt-hours per rotation: constant 72.
Reverse rotation flags Set if reverse rotation observed, 2 day FIFO.
Demand data Units of kilowatts, constant 72 15-minute demand, and 30-day
interval, 2 interval FIFO.
Power outage Counts and day/time stamps power outage.
Profile data User set interval, between 1 minute and 4 1/4 hours.
User set scale factor.
Signed 16-bit data.
Units of 0.1 watt-hours, adjusted by scale factor.
3968 intervals in FIFO organization.
Example: 15 minutes per interval provides 43 days data.
Sensor tamper Counts and day/time stamps abnormal sensor values.
Local clock Crystal based.
Operating
Operating temperature
-8° to +117° F.
Operating voltage 230 VAC nominal.
Operating current 4 milliamps.
Size of unit 4.5" x 2.0" x 0.8" approx.
Size of optical sensor 1.25" oval, 1" high (to verify).
Weight 1.4 oz (40 grams).
Local clock Crystal based, nominal 100ppm.
Sensor Infrared, optical.
Meter disk marking Black decal/Painted disk.
©
Datamatic, Ltd. 2000 - 2003