ASAT-04 Electric Fence Sensor-Alarm-Monitor
(Dual Output)

OPERATIONAL PARAMETERS:

• Input Power Requirements: 12 to 24 volts DC (nominal 12 volt battery preferred)

• Power Usage: The input power required is 0.25 watts

• High Voltage Input Pulse: will read a 200 volt pulse to a 20,000 volt pulse.

• 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 @ 30 volts (This is sufficient for most piezo sounders) 

• Maintenance voltage level or Low Voltage Level is adjustable and is variable from 1kv to 8kv input

• Voltage Loss Output: Contact closure rated 0.5 amps @ 30 volts (most sirens and loud alarms will require a power contactor/relay) This contact closure operates when the pulse voltage drops below 0.2kv (200 volts)
  

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" or "low voltage" level. The maintenance threshold voltage is set at 6kv at the factory.

      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 reduces the effective pulse voltage to below the adjustable maintenance level voltage point, then the yellow LED will light and the maintenance contacts will close (after a time delay). The maintenance function has an approximate 90 second delay to avoid false alarms. If the grass or weeds are blown off or removed and the charger pulse voltage is restored, then the maintenance alarm will reset itself and the maintenance contacts will open. The RG7781-m model has an adjustable maintenance delay of 5 to 90 seconds.

     When the pulse voltage drops or becomes less than 200 volts, the "no voltage" contacts will close. There is a built-in delay of 5 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.) The RG7781-a model has an adjustable alarm delay of 5 to 90 seconds.

     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.

     The most reliable operation of this electric fence monitor-sensor-alarm is with using a separate earth ground rod (located at least 5 metes from other ground rods). This connection to a separate earth ground rod will allow the monitor companion to measure "earth voltage" or "grounding" of the fencing system. This will still accurately measure the "fence voltage" A good ground with multiple grounding rods, interconnected, and driven at least 2 meters into the ground (deeper is better) is critical to the proper operation of the fence. 

Product features:

1. Directly connects to any electric fence by the high voltage input connections.
   

2. Shows "hot and normal" working fence with Green Pulse LED.
   

3. Shows when maintenance is required with Yellow "Low Voltage" LED.
   

4. "Maintenance Required" feature by triggering the "maintenance alarm" relay.
   

5. "No Voltage" Shows failing fence with Red "No Voltage" LED with separate alarm contacts.
   

6. Provides alarms contacts for BOTH "low voltage" and "no voltage".
   

1. Low Fence Voltage alarm set point "maintenance required" precise voltage adjustment and setting using the table in the enclosed instructions.
   

2. Adjustable delay from "Low Fence Voltage" to sounding "maintenance alarm" (model RG-7781-m only). Standard model is approximately 90 second delay.
   

3. Adjustable delay from "No Fence Voltage" to sounding "no voltage alarm" (model RG-7781-a only). Standard model is approximately 5 second delay.

© Accoutrements Security Alarm Trading & Services 2003 - 2008
Mandaue City, Cebu Philippines