• OPACITY MONITOR MANUAL IM-A-08740-05 • 13
3.3 Calibration on Continuous Display Screen
For a summary of the calibration information below, refer to Figures 10 through 13.
3.3.1 AUTO CALIBRATION MODE
To calibrate the LED light source and receiver units, press the “Enter” button until the “Enter Cal Menu?”
message appears. While holding down the “Inc” button, press the “Dec” button simultaneously to display the
“Calibrate Opacity” screen. While holding down the “Inc” button, press the “Dec” button simultaneously to display
the “Auto-Cal Purge” screen and initiate the purge countdown from the purge delay value (which is already
congured: see section 3.2 above, and line 5 in Figures 11, 12, or 13). Following the countdown, the “Calibrate
Phase-1” message appears, along with a countdown from 04 to 00, and the LED light source lamp goes out.
Following the countdown, the “Calibrate Phase-2” message appears and the LED light source lamp comes on and
varies in intensity as it adjusts to the diameter of the stack. While the adjustment is in progress, a countdown from
“40” displays on the screen, but calibration may be complete before it reaches “00”. At the end of the calibration
process, either the default screen display or a calibration error screen appears. “Cal Err #1” means that the
receiver has not detected enough light from the LED light source. “Cal Err #2” means that the receiver has
detected too much light from the LED light source. In either case, the process conditions responsible for the error
message must be corrected, and then the calibration process must be repeated until successful.
To calibrate the retransmitted 4-20 mA dc signal, connect a 4-20 mA meter to the retransmit terminals,
and then follow the steps above until the “Calibrate Opacity” screen appears. Next, press “Enter” to display the
“Calibrate Retrans” message. While holding down the “Inc” button, press the “Dec” button simultaneously to
display the “Set Retrans Low” screen. Observing the meter reading, use the “Inc” and “Dec” keys to correct the
value. The output can be varied from 4 mA by ± 0.5 mA dc. When satised, press the “Enter” key again and the
“Set Retrans High” message appears. Observing the meter reading, use the “Inc” and “Dec” keys to correct the
value. The output can be varied from 20 mA by ± 0.5 mA dc.
3.3.2 MANUAL CALIBRATION MODE
To calibrate the LED light source and receiver units, press the “Enter” button until the “Enter Cal Menu?”
message appears. While holding down the “Inc” button, press the “Dec” button simultaneously to display the
“Stack Clear?” screen. Check the stack, and press “Enter” to conrm that it is clear. The “Calibrate Phase-1”
message is displayed, along with a countdown from 04 to 00, and the LED light source lamp goes out. Following
the countdown, the “Calibrate Phase-2” message appears and the LED light source lamp comes on and varies
in intensity as it adjusts to the diameter of the stack. While the adjustment is in progress, a countdown from “40”
displays on the screen, but calibration may be complete before it reaches “00”. At the end of the calibration
process, either the default screen display or a calibration error screen appears. “Cal Err #1” means that the
receiver has not detected enough light from the LED light source. “Cal Err #2” means that the receiver has
detected too much light from the LED light source. In either case, the process conditions responsible for the error
message must be corrected, and then the calibration process must be repeated until successful.
To calibrate the retransmitted 4-20 mA DC signal, connect a 4-20 mA meter to the retransmit terminals,
and then follow the steps above until the “Calibrate Opacity” screen appears. Next, press “Enter” to display the
“Calibrate Retrans” message. While holding down the “Inc” button, press the “Dec” button simultaneously to
display the “Set Retrans Low” screen. Observing the meter reading, use the “Inc” and “Dec” keys to correct the
value. The output can be varied from 4 mA by ±0.5 mA dc. When satised, press the “Enter” key again and the
“Set Retrans High” message is displayed. Observing the meter reading, use the “Inc” and “Dec” keys to correct
the value. The output can be varied from 20 mA by ± 0.5 mA dc.
3.4 Other Adjustments on Continuous Display Screen
MODBUS ADDR: Set the Modbus address from 001– 247, using the “Inc” key to increase the value or
the “Dec” key to decrease the value.
BAUD RATE: Select a baud rate of 9600 or 19200, using the “Inc” or the “Dec” key to toggle between
these values.
PRINT INTERVAL: Select a print interval value between 0 and 60 minutes to regulate printed report fre-
quency. A print interval of “0” disables the printer output.
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