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Phase Detection Sensor (PDS-1)

Reliably detect phase loss in three-phase systems

Phason's Phase Detection Sensor (PDS-1) works with the Local Environment Monitor (LEM) and OMNI-Site Watcher to continuously monitor three-phase power.

The PDS-1 is designed to monitor the power for a single line. Using multiple PDS-1s, you can monitor additional circuits, zones, or rooms at your site. You can connect up to six PDS-1s to a single LEM.

Phason has a Power Loss Sensor (PLS-1) available for detecting power loss in 120 VAC, single-phase systems.

How phase loss detection works

The phase-monitoring relay has adjustable voltage (200 to 480 VAC), unbalance trigger (2 to 10 % variation), and trip delay (0.25 to 30 seconds) settings. When the voltage on a phase varies by more than the unbalance trigger percentage and for longer than the trip delay, the relay on the PDS-1 opens, signaling the Local Environment Monitor.

If the power stays off longer than the fault duration, the LEM signals the OMNI-4000 software that there is an alarm condition. If you have the OMNI-Alert alarm notification system installed and the alarm is set to active, OMNI-Alert dials the contacts on its call list and notifies them about the condition.

Features Easy installation in new or existing sites Phase-monitoring relay General-purpose relay Mounting rail and sockets 90-day limited warranty Electrical ratings Input: 200 to 480 VAC, 50/60 Hz Unbalance trigger: 2 to 10 % Trip delay: 0.25 to 30 sec

Additional information

• PDS-1 installation guide (PDF - 121K)
• PDS-1 feature sheet (PDF - 126K)
• PDS-1—part of your 'Risk management and livestock insurance strategy'
• Risk management and insurance solution for current OMNI users (PDF - 256K)
• Risk management and insurance solution for non-OMNI users (PDF - 250K)

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