User's Manual

Chapter 1: System Overview 9
Temperature Rating:
-40° F to 185° F
Radio communications: 916.5 MHz
Radiated power: 1 milliwatt per millisecond
FIREFLY Optical Sensor
The FIREFLY MIU uses a unique and
highly sophisticated optical sensor unit
to track meter activity. An infrared
strobe is integrated into the sensor and
generates its own light, regardless of
ambient conditions. The sensor is
oriented so that the register needle
approaches the sensor from the cable
side and perpendicular to the cable.
The indicators on the top side of the
sensor need to be aligned with the
passing sweep hand. As the needle
sweeps past the sensor, it changes the
light reflected back from the meter
face, and an incremental count is
registered.
The Optical Sensor is affixed to the
meter face using a high-bond adhesive
tape. Specifications for the tape follow.
Optical Sensor Tape Specification
Manufacturer 3M.
Part Number 4951VHB.
Material Acrylic Foam-Closed Cell.
Thickness .045 inch.
Color White.
Release Liner .002 inch clear polyester.
Application Temp
32°+ Fahrenheit.
Curing 24 hours minimum.
Peel Adhesion Test 18lb. per square inch (to stainless at room temp).
ASTM B-3330.
D-897.
Tensile Strength 110 lbs. per square inch.
Static/Sheer Test At 72 degrees – 1250 lbs.
(Slide pressure) At 150 degrees – 500 lbs.
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Datamatic, Ltd. 2000 - 2003