Key Features

• Utilizes Windrock’s patented “smart” module
• Enables monitoring of additional parameters and communication via MODBUS
• Allows addition of phase referenced piston rod drop/rod runout measurements
• Modular system architecture can be configured with other On-Guard™  family modules to meet your monitoring requirements
• Installation is simple, fast and inexpensive
• Can be mounted at the machine to reduce the length of cable runs
• Optional On-Guard™ diagnostic software for monitoring, analysis, reporting, and trending
• On-Guard™ software available in single user and multi-user network license versions

P-Guard

The twelve channel module is a cost-effective method of obtaining a wide variety of critical process data for monitoring, trending, and alarming.  By utilizing the P-Guard module, process data can now be easily correlated to the dynamic data captured by one of our other On-Guard™ modules, such as C-Guard, HP-Guard, V-Guard II, or E-Guard.

Each P-Guard module has its own processor, memory, and multi-drop address and is easily connected to any of our other modules via a 2-wire interconnecting cable.

The twelve channel module can also be used as a stand-alone device when connected to the user’s PLC or DCS via a standard RS-485 com link.  An optional alarm relay can provide remote annunciation.

Data Acquisition

The twelve inputs can be any standard 4-20 mA or 1-5 VDC loop-powered module. Engineering units, scale factor, and alarm levels are user programmable and are stored in non-volatile memory on the module. 

Typical module inputs are:

• Temperature for bearings, lube oil, jacket water, packing and suction/discharge gas
• Pressure for lube oil, jacket water, and fuel gas
• Vibration for cylinder, frame, and bearings on auxiliary components, such as oil pumps, fans, and turbocharger
• Rod drop/runout for rider band wear and piston motion

Specifications

Size: 8 inches high x 10 inches wide x 2 inches deep

Weight: Less than 3 pounds

Number of Channels: Twelve (12) 4-20mA or 1-5 VDC

Hazardous Area Ratings: Suitable for Class 1, Div. II, Groups A, B, C, D areas. Sensors rated for Class 1, Div II, Groups A, B, C, D areas.

Outputs: PLC / DCS Interface - standard integer-based MODBUS RS-485, RTU
                 Analog - 4 - 20mA isolated, loop-powered, scalable (user-defined range)
                 Alarm Relay - Hermetically sealed, selectable N.O. or N.C. output logic               

Power: 20 - 30 VDC, 250mA

Environmental Limits: -25 degrees F to +150 degrees (operating); -40 degrees F to +185 degrees (storage) up to 95% humidity (non-condensing)

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P-Guard

On-Guard™ module for process input monitoring