NuFlo MC-II Plus Panel Mount, User Manual, Page: 11 / 92

MC-II Plus WP-PM Flow Analyzer
May 2005 5
When the Error message is displayed, press any of the four keys on the keypad and
the first error will be shown on the upper line of the display. Press INCR or STEP to
check for additional errors. Each time INCR or STEP is pressed, the next error will
be displayed. After the last error is displayed, pressing INCR or STEP again will
display the first error again and the process will be repeated. It is recommended that
the
INCR or STEP keys be pressed repeatedly to display all Error messages. The
ENTER key may be pressed to return to the Run Mode or the ACCESS key may be
pressed to enter the Calibrate Mode to correct the errors as shown below in this
section.
If more than one
Error condition exists, and one of these errors is corrected, the
next Error will be displayed. If all Error conditions cease to exist, the MC-II Plus
Flow Analyzer will automatically return to the Run Mode.
There are four
Error messages in the current version of firmware: rAtE, PULS.oUt ,
4-20.oUt/Err Hi and 4-20.oUt/Err Lo .
The
rAtE error message indicates a rate overflow. This means that the rate is in
units too large to be displayed on the LCD. Normally this error may be corrected by
entering the Calibrate Mode and changing the rate units of measure. These
changes are covered in the
Calibration section of the manual.
The
PULS.oUt error message indicates the pulses are accumulating faster than the
unit can output them. When pulses in excess of 255 have accumulated internally,
the MC-II
Plus Flow Analyzer displays the PULS.oUt error message. The MC-II
Plus Flow Analyzer can internally accumulate 65535 pulses, so the Error message
occurs long before pulses are lost. The MC-II Plus Flow Analyzer will continue to
output the accumulated pulses until the accumulated number drops to zero, even if
the flow rate stops. This ensures that no pulses will be lost unless the accumulated
value exceeds 65535. Normally this error may be corrected by entering the
Calibrate Mode and selecting a larger pulse output scale factor and/or a shorter
pulse width duration. These changes are covered in the
Configuring Pulse Output
section of the manual.
The
4-20.oUt/Err Hi error message indicates the flow rate has exceeded the full-
scale calibrated flow rate setting to the point that the current output has exceeded 22
mA. The
Error message appears on the lower line of the display only during the
time that the condition exists. When any key is pressed during the error condition,
the
4-20.oUt message appears on the upper line of the display and the Err Hi
message appears on the lower line of the display. This error may be caused by
excessive flow rate or the full scale flow rate calibration point being set too low for
normal operating conditions. Changing the full-scale flow rate calibration point is
covered in
Configuring the 4-20 mA Rate Output section of the manual.
The
4-20.oUt/Err Lo error message indicates the flow rate is below the calibrated
low flow rate setting. The output current will be 3.9 mA. The Error message