OPERATIONAL PARAMETERS:

• Input Power Requirements: 12 to 24 volts DC ... 12 volt battery or AC adapter.
  

• Power Usage: The input power usage is 0.25 watts.
  

• High Voltage Input Pulse: accepts up to 20,000 volts. If lightening strikes the fence,
  the alarm will survive over a half million volt pulse without damage.
  

• Pulse Width Accepted: 50 microseconds to 10 milliseconds
  

• Pulse Period Accepted: 5 hertz to 0.5 hertz (5 pulses/sec to 2 seconds between pulses
  

• Maintenance Output: Contact closure rated 0.5 amps @ 60 vdc and 100 vac (This is sufficient for most piezo sounders) This casual maintenance output activates when the high voltage input pulse level drops below the "set-point level" which is variable from 1.5 k-volt to 8 k-volts. This is sufficient for most fence applications.
  

• Voltage Loss Output: Contact closure rated 0.5 amps @ 60 vdc and 100 vac (most super loud sirens and alarms will require a power contactor/relay) This output activates when high voltage  input pulse drops below 0.2kv (200 volts)
  

• Automatic Reset: All circuits will reset when voltage is re-introduced to the sensor. 
  On some installations, a latching circuit or latching relay may be desired to hold
  the alarm "on" until manually reset.

INDICATING LIGHTS (LED's):

• Green LED flashes for every high voltage pulse that is a higher voltage than the set-point or maintenance required voltage.
  

• Yellow/Amber LED indicates that the high voltage pulse is low and your fence requires maintenance. Also the low voltage contacts will close. Usually clearing the grass and weeds from the fence clears this indication.
  

• Red LED indicates that there is a loss of voltage and immediate action should be taken to preserve the integrity of your fence.

TERMINAL CONNECTIONS:

• terminals 1 & 2 are the "No Voltage" contacts and correspond to the RED indicator

• terminals 3 & 4 are the "Low Voltage" contacts and correspond to the YELLOW indicator

• terminals 5 & 6 are the power input has is to be connected to a power source of 12 to 24 volts DC. A 12 volt battery or AC adapter.

PACKAGING:

• The boxed unit measures 7, 1/2 inches (190 mm) X  5, 5/8 inches (145mm) X 2, 7/16 inches (65 mm)

• The boxes are printed to catch the eye and readable in any stacking or shelving configuration.

• An installation and operation booklet are included in each package.

• A Circuit layout is printed on the inside of the unit cover.

OPERATION:
     This high voltage sensor takes an electric fence charger pulse and analyzes it for peak voltage, pulse width and period. The RG7781 can accurately measure voltage pulses from almost any fence charger or pulse source, including the spark voltage on a gasoline engine.

     The design algorithm used in this device was determined for stability, longevity, and reliability under a wide set of usage parameters. (patents applied and pending )

     The green light will flash for every pulse that is higher than the maintenance voltage. The maintenance threshold voltage is set at 6kv at the factory.

     The "maintenance set-point voltage" is usually set about 1kv to 2kv less than the fencer output. Then the creeping weed growth will be noticed before the fence voltage drops below effective level.

      This maintenance voltage is adjustable from 1.5kv to 8kv. If flora (grass, bushes, limbs, and leaves) partially load or partially short out the high voltage and reduce the effective pulse voltage to below the adjustable maintenance level voltage set point, then the yellow LED will light and the maintenance contacts will close. The maintenance function has an approximate 110  second delay to avoid false alarms. If the grass or limb is blown off or removed and the charger pulse voltage is restored, then the maintenance alarm will reset itself and the maintenance contacts will open.

     When the pulse voltage drops or becomes less than 200 volts, the "no voltage" contacts will close. There is a built-in delay of 10 seconds before the red LED will light and the alarm contact close to eliminate "false alarms". The algorithm used in this circuit also eliminates false alarms  from reverse pulses that may occur from close proximity lightening strikes. If the voltage drop is intermittent the circuit will reset itself. (For some security applications, a latching relay contact  may be desired on some output relays.) (please ask if you require this function)

     This device is designed for long life with ease and consistency of operation and all units have a one (1) year warranty including lightening damage.

WARRANTY:
     Each unit is unconditionally guaranteed for a period of one year (12 months) from the date of retail sale. Sales slip shall accompany each returned unit. We reserve the right to either repair or replace the unit at our discretion. Failed units can be returned to either our Philippine office or our United States offices.

If you have any questions regarding this item, please submit them below.

Home - Sensor Specifications - Products/Store - Design Solutions - Compare
Installation Pictures - Installation Instructions - Wholesale Inquiries - Contact Us