JVA ZM1 & ZLM4 Low Voltage Monitors

JVA ZLM4 Low Voltage Monitor
The ZLM4 is a 4-zone, low voltage, non-lethal electrified 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 yards long, to detect someone tampering with your electric security fencing by cutting or shorting the wires. When used in conjunction with a high voltage electric fence charger, 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 fence energizers. It may be connected via a keypad and networked with other Z-series devices to enable the whole group to be controlled via one keypad, or via 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 your high-security fencing and to the particular requirements of the site. This is achieved by adjusting the device’s programmable options.

The ZLM4 will report an alarm on:

• Detecting a low voltage loop cut (open circuit)
• Shorted to the ground (short)
• When the high voltage from an electric fence energizer wire is shorted to the monitored low voltage loop
• When two low voltage loops short to one another (cross couple)