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JVA LOW VOLTAGE 4 Zone monitor



JVA LOW VOLTAGE 4 Zone monitor

R 3,731.63 Excl Vat.

The ZLM4 is a 4-zone, low voltage, electric fence monitor. The ZLM4 may be used by itself or in conjunction with a number of high voltage security electric fence energizers. The ZLM4 monitors up to 4 loops of fence wire, each up to several hundred meters long, to detect someone tampering with the fence by cutting or shorting the wires. When used in conjunction with a high voltage electric fence energizer, the ZLM4 is wired to the non-energized earth wires on the fence. In this way, the ZML4 can be used to split one high voltage zone into up to 4 low voltage monitored zones for improved targeting of the response to potential security breaches.

The ZLM4 is compatible with the JVA Z series energizers. It may be connected via a keypad bus network with other Z series devices to enable the whole group to be controlled via one keypad, or linked to a PC running JVA Perimeter Patrol software. The ZLM4 monitors a low voltage loop using intrinsically safe, isolated ELV DC. It employs a continuity check for detecting open circuits, DC voltage level sensing to detect a short to ground and pulse voltage sensing to detect a short to a line powered by a high voltage fence energizer.
The advanced features of this device allow the performance to be tuned to the fence and to the particular requirements of the site. This is done by adjusting the device’s programmable options. The ZLM4 will report an alarm on: detecting a low voltage loop cut (open circuit); shorted to ground (short); when high voltage from an electric fence energizer wire is shorted to the monitored low voltage loop; or when two low voltage loops short to one another (cross couple).
The ZLM4 is an ideal solution for maintaining detection but enabling an installer to keep his fence SANS 10222-3 Compliant, by keeping the fence below 1.5m monitored but without a High-Voltage shock, in public access areas.


  • Can be used to split a single security electric fence zone into up to 4 low voltage zones
  • Can detect a short, cut, or if the monitored wire is touching a high voltage wire
  • Optional LCD display — displays which zone is in alarm and other information
  • Controlled and programmed via a JVA Keypad with similar codes to the JVA Z series
  • Able to be integrated into third party access control and security information management systems at a variety of levels
  • Enables the construction of systems from economical key switch operation to complex PC controlled applications
  • Runs from 16Vac or 12V DC external source
  • Built-in Battery Charger for optional 7aH back up battery
  • Siren and Strobe switched 12V DC outputs for standalone operation
  • 2 Control Inputs and 4 Relays with many programmable functions for low level integration with other systems
  • Fence connection are fully isolated from power and IO as per relevant part of ICE60335.2.76

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