ICIS Hardware

WTC Integrated Control Instrumentation System (ICIS) connects to a standard IBM compatible PC via RS 232, RS 485, dialed modem, spread spectrum modem or other serial device. The ICIS can be either rack or wall mounted. The ICIS can have built in I/O that will read or write analog and discrete signals or utilize a MODBUS serial interface for the I/O. ICIS converts any signals into engineering units as needed. The data is analyzed and any alarm generation and control sequences are performed. Math equations calculate any needed emissions data.

Example: given ppm values and flow rates, the ICIS will calculate lbs/hr lbs/mmBtu, lbs/month, tons/day, tons/year, etc. Required averages are calculated and stored. Violations are flagged and counted. Each data record on the ICIS has a corresponding "status" which gives the condition of the data. Common statuses include:

• Instrument Failure (IF)
  
• Monitoring Not Required (MNR)
  
• Calibration (CAL)
  
• Out of Control (OC)
  
• User Disabled (UD)
  
• However almost any flag is possible

The system is factory configured to exact specification, however, changes to the configuration are performed through the DMCS software. PROM changes or program changes are not needed to realize operation changes. The ICIS has the flexibility to change as government requirements and end-user's needs change.

PC-Independent operations:

The ICIS stores all data and programs in battery-backed RAM. This provides automatic restart after power failure and allows on board data storage. Typically, calibration, alarm and periodic data can be stored for 10 to 20 days depending on the data reduction required. This provides protection against a PC or communication failure. This feature adds a significant level of reliability to the system.