Dynalco Catalyst Monitor - Manual (Page 3)

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System Overview
The Dynalco Catalyst Monitor is designed to address the EPA mandate regarding continuous
monitoring of catalyst inlet temperature and differential pressure on both spark-ignited and
diesel engines. It is capable of reading up to 6 input channels, calculating differential values,
providing alarm / shutdown outputs as well as allowing all parameters to be logged to an
internal flash memory. An RS-485 Modbus link for communications to a DCS or PLC is also
provided.
Additionally, the Catalyst Monitor is capable of calculating the engine catalyst inlet
temperature based on a 4 hour rolling average per latest EPA requirements.
Basic operation:
The Catalyst Monitor will be in “stopped” or non-monitoring mode until a run indication is
sensed. This is selectable as either a contact closure or magnetic pickup input. Once
“running” mode is sensed, the Catalyst Monitor will read all inputs at a rate of 100 msec per
channel. If any input crosses either an over or under threshold, the unit will invoke a flashing
red LED on the front panel as well as an output trip (solid-state relay) that can be used for
alarm or shutdown. Any trips will also cause the Catalyst Monitor to date / time stamp
whenever a trip threshold is crossed. The monitor will log the last (10) alarm events for each
channel input. These may be viewed on the front display.
All data is also accessible via an RS485 serial Modbus link.
Data logging functions can also be enabled where logged values are saved to an onboard
flash memory.
4-Hour Rolling Average Logs:
The EPA 4-hour rolling average is configured to log the instantaneous catalyst inlet
temperature every 15 minutes. The instantaneous values are then used to calculate 1-hour
averages which are used to calculate a 4-hour average. The 4-hour average is a rolling
average allowing logged data from previous engine run times to be included with next run
times. When the “EPA Average” is enabled, the Catalyst Monitor will log continuously as long
as it has received an engine run signal.
IMPORTANT:
A run signal (either digital or RPM input) must be selected in order to properly log the
4-hour rolling average. (See page 10 for configuring run signal.)
Additional Data Logging:
The Catalyst Monitor also allows additional data logging of any monitored values where they
will be saved to an internal flash memory. Up to 10 log events may be selected, including
logging of the catalyst differential pressure at user programmable intervals.