Any Customer Specified OFF:ON Ratio
ON at 3 FC OFF at 1.8 FC (0.6:1 Ratio)
ON at 3 FC OFF at 1.0 FC (0.3:1 Ratio)
ON at 1.5 FC OFF at 1.5 FC (1:1 Ratio), etc.
Zero crossover load switching
Double-Sided Plated-Through Circuit Board (DSPT) for durability and reliability
Quad-Gate Technology for precision and consistency
Full Wave Rectification
Dual Zener Diodes
320 Joule MOV
High Impact Thermoplastic Base
Solid Brass Contact Blades
UV Stabilized Permanent Color, High Impact Resistant Polypropylene Cover
Ripley's microcontroller technology presents a True Inverse Ratio Photocontrol that provides a precise Turn-OFF light level lower than the Turn-ON level.
RI 8544
Nominal Voltage 50/60 Hz
120/208/240/277
Voltage Range
105-305
Fail Mode
On
Load Rating
1000 Watt Tungsten / 1800 VA Ballast
Operating Temperature
-40C to +70C (-40F to +158F)
Photocell
Encapsulated Silicon Phototransistor
Dielectric Strength
5000 Volts between current carrying parts and metal surfaces
Surge Protection
320 Joule MOV / 10,000 amp surge current
Power Consumption
0.5 watts @ 120 V
Time Delay Off (Instant On)
3 to 5 seconds
Operating Light Levels (Standard Settings)
Turn On 1.5 FC ± .25 / Turn Off by 0.9 FC
(Off:On Ratio = 0.6:1)
ANSI Color Coded Cover
Blue (Standard)
ANSI Color Coded Cap Options
Option Code 1 (Add to end of Model Number)
Green
-GN
Black
-BK
Brown
-BN
Orange
-ORN
Operating Light Levels Option
Option Code 2 (Add to end of Model Number, after Option Code 1)
Denotes Turn On, and Turn Off point in FC
Specify Turn On point - Specify Turn Off point in FC
* Before Ripley's introduction of the Inverse Ratio photocontrol, accurate True Inverse Ratio Control was an elusive goal in the lighting control industry. The premise of Inverse Ratio Control is to reduce burn-time and energy consumption by allowing lights to be turned off at a lower light level setting than the light level setting utilized to turn them on. However, with a Turn OFF setting lower than the Turn ON setting, a typical photocontrol would (short-cycle) turn the lights on a the Turn ON value and turn them back off as soon as the light level dropped below the (lower) Turn OFF setting.
Various methods of circumventing the (short-cycle) problem have been incorporated into competitive units, but they rely on inaccurate, fixed time-delayed schemes. In order to achieve true consistency and true accuracy, and provide a True Inverse Ratio Control, Ripley's microcontroller technology continuously samples and monitors conditions to optimize the photocontrol's performance.
