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Guardian Controller

The Coral Guardian Series Metal Finishing Controller is a powerful, affordable, analytical process controller. The simple, user-friendly programming makes it easy to configure the Guardian to control multiple chemical process stages including cleaners, pretreatments and sealers, as well as rinse and wastewater streams. It will monitor and control based on Conductivity, pH and ORP sensor inputs as well as measurement inputs from other devices such as level, temperature, pressure and flow devices.
The Coral Guardian Series Metal Finishing Controller operates 24 hours a day, 365 days a year, keeping on-site and off-site personnel notified of system performance, while providing accurate process control.


       Easy to start-up and use – with just a web browser
       Immediately notify on-site and off-site personnel of any problems via e-mail, cell phone text message or pager
       Log process data and e-mail reports and data on a regular basis
       Provides up to 4 industrial grade direct sensor inputs (Conductivity, pH, ORP)
       Provides 8 output relays for process control
•  Relays can be either prewired or open for hard wiring
    Relays can be either powered or dry contacts depending on use
Multitude of Relay Control Modes available for process control including On/Off, Time Proportional and Intermittent (Fixed Blowdown) control
       Optional Analog and Digital Inputs
     Add 8 input Analog input board for additional data and devices
     Add 6 input Digital input board for additional devices
     Controller comes standard with 3 Digital inputs
       Optional Analog Outputs
     Add up to 4 Analog Outputs to transfer data to external systems
       Digital Communications Hardware
     Controller comes standard with USB and Ethernet capabilities
     Add a Modem Card for remote monitoring of the controller
       Digital Communications Software
     Ethernet Networking (Master Capability) for access to all controllers on a network
     Modbus TCP/IP (Server Mode Only) for seamless internet connectivity to the controller


With an embedded web server, the Coral Guardian Series Metal Finishing Controller utilizes standard TCP/IP Internet communications. Remote communications can be established with the Guardian via the Internet or on a direct line with modem to modem capability. USB and Ethernet allow the easy on-site access for plant personnel and system operators. Multiple users can access the controller simultaneously. A graduated password protection system allows users varied degrees of access from view only to full system configurations. In addition, the Guardian delivers a range of user-friendly information reporting tools.
The Guardian supports all global communications standards:
        USB Plug and Play for local laptop communications (standard feature)
        Ethernet for LAN communications (standard feature)
        Internal analog modem (optional)
        Internal cellular modem utilizing the latest global standard digital technologies (CDMA, GPRS, GSM) used by most major cellular carriers (optional)
USB Plug and Play
        For local monitoring and reconfiguration of the Guardian controller via a laptop or dedicated on-site PC
ShoulderTap Internet Communications
        For monitoring and reconfiguration of the Guardian controller remotely via the internet (requires modem card option)
DirectTap Modem-to-Modem
        For remote monitoring and reconfiguration of the Guardian controller using traditional modem-to-modem communications (requires modem card option)
        For monitoring and reconfiguration of the Guardian controller via a Local Area Network (LAN) or remotely via the Internet
Need more info? Contact our Guardian Series Automation department here.
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