Key Features

• Utilizes Windrock’s patented “smart” module
• Comprehensive mechanical condition and performance monitoring
• Alarms on excessive rod load, lack of rod load reversal, excessive rod drop or rod runout
• Modular system architecture that can be configured with other On-Guard™ family modules to meet your monitoring requirements
• Installation is simple, fast and inexpensive
• Can be mounted on the machine deck 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
• Integrated intrinsic safety barriers

C-Guard

Windrock's patented online monitoring system utilizes a family of "smart" modules to monitor the performance and mechanical condition of critical machinery, providing continuous machine protection. The intelligent and unique design of these "smart" modules significantly reduces the installed cost of a system.

Each module accepts multiple inputs from a wide variety of sensors. The module has its own internal processor and memory and is capable of performing complex calculations, alarm detection, and error checking.

Installation is fast and inexpensive because the modules are mounted on or near each machine's frame or cylinder and are connected with one small multi-wire cable.

The monitoring solution for critical compressor cylinder performance and mechanical condition is the patented seven-channel C-Guard. This smart module accepts inputs from two pressure sensors (head and crank end cylinder pressures), two temperature inputs (gas suction and discharge temperatures), one accelerometer. optional rod drop, and one auxiliary input. In addition, the C-Guard monitor accepts one or two speed/phase pickups.

The internal processor continuously monitors all inputs in "real-time" and calculates compressor IHP, rod loading, rod reversal, percentage of load, and volumetric efficiencies. It compares the inputs and calculated results against alarm levels and communicates the value and alarm conditions back to the user's PLC/DCS systems via RS-485 (MODBUS) and/or Windrock's On-Guard™ diagnostic software running on a local or remote workstation. An optional alarm relay is available for remote alarm indication.

Reports and Graphs

• Reports
  Compressor Performance
  Machinery Alarms
  System Alarms
  
• Diagnostic Plots
  Dynamic Plots (PVs)
  Multi-parameter Trends
  Multi-parameter Overlays
  Statistical Histograms
  X-Y Correlations

Specifications

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

Weight: Less than 3 pounds

Number of Channels: 7 sensor input channels for cylinder monitored (dynamic cylinder-end pressure, suction/discharge temperatures, vibration, rod drop/end runout, or auxiliary input)

Alarms: Vibration, impact, load, rod loads, over-pressure and over-temperature

Hazardous Area Ratings: Suitable for Class 1, Div. II, Groups A, B, C, D areas. Built-in I.S. barriers allow wiring and sensors to be located in Class 1, Div I, Groups A, B, C, D areas.

Outputs: Easily integrated interface to User's PLC, DCS or PIE systems using standard integer-based MODBUS RS-485, RTU, MODBUS/TCP or OPC.

Alarm Relay - hermetically sealed, SPST, 1 Amp dry contact (optional)

Power: +24 to +30 VDC, 200mA maximum

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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C-Guard

On-Guard™ module for comprehensive
reciprocating compressor
cylinder monitoring