header piping2
Piping Systems & Welding

Electronic Low-Point Leak Detection

LiquidWatch II® Series

LiquidWatch II® is a highly modular leak detection system designed to detect water and volatile liquids using discrete probes with fast sensing response time. The system is expandable up to 64 probes and alarm relays. The system can monitor probes up to 20,000 feet away when connected to the Remote Probe Module (RPM-8). With the built-in intelligence at the control panel, the LiquidWatch® II system can operate as a standalone system or connected as a network solution centrally managed by the PALCOM® software. The system also supports third party integration via Mosbus and BACnet protocols.

Ideal Applications Include:

Low-point leak detection is similar to detecting leaks manually but utilizes electronic sensors in the place of manual valves or plugs. A wide variety of low-point sensors are available with varying functionality. Selection of sensor type is often dependent upon transported media. The two most common sensors are conductivity probes and float switch adapters.

Dimensions 13.75" x 11.81" x 4.00" / (350mm x 300mm x 102mm)
Weight 14.6 lbs / (6.6 kg)
Mounting Wall mount through holes on back of panel
Operating temperature: O° F to 122° F / (-18° C to 50° C) 95% RH at 122° F / (50° C)
Max Humidity: 95% RH at 122° F / (50° C)
Ingress Protection: IP52 - standard indoor only
NEMA Rating: 12 - standard indoor only
Enclosure Option: IP66 or NEMA 4X (optional for outdoor)
Supply Voltage: 110-240 VAC, 50/60 Hz, 0.3 A/ SOVA 24 voe, 1 A 124 VA
Ethernet Port: 1 Port
Communication Port: Port 1 - RS485 or RS232
Port 2 - RS232
Relay Type: SPOT Dry Contacts, 1 0A / 250 VAC
No. of Relays: 6 x built in relays/ 60 x expandable relays


  • Sensing of organic liquids (hydrocarbons and solvents) or water
  • Up to 64 probes and programmable alarm relays
  • Vapor and gases are ignored
  • Intuitive HMI interface for easy setup and diagnostics directly at the panel
  • Customizable passcode login to ensure maximum security
  • Built-in with Ethernet port, RS-232 and RS-485 for communications
  • Comprehensive event and alarm logs stored locally
  • Supports Modbus TCP, Modbus RTU and BACnet protocols for 3rd party integrations
  • Optional NEMA 4X enclosure
  • Can be used with Duo-Pro®, Poly-Flo®, Fluid-Lok® systems


Liquid Watch System

  • Sensing of organic liquid (hydrocarbons and solvents) or water within seconds of contact
  • Vapor or gases are ignored
  • Remote monitoring capability with a RS-232 interface and relays
  • NEMA 4X enclosure
  • Up to 64 probes and 16 programmable alarm relays
  • Optional UL Listed with Class 1, Division1, Group C & D sensor circuits