Twilight MC-SUP2000H, Manual

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Chapter 3 Menu Windows Arrangement
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seconds the backlight will be on with every key pressing.
M71 LCD contrast control. The LCD will become darker when a small value is
entered.
M72 Working timer. It can be cleared by pressing ENT key, and then select
YES.
M73
Enter Lower Flow Rate value that will trigger the #1 Alarm. There are two
virtual alarms in the system. By “virtual” we mean that the user must
redirect the output of the alarms by setuping the output hardware in M78
and M77
M74 Enter the higher flow rate value that will trigger the #1 Alarm.
M75 Enter the lower flow rate value that will trigger the #2 Alarm.
M76 Enter the higher flow rate value that will trigger the #2 Alarm.
M77
Buzzer setup.
If a proper input source is selected, the buzzer will beep when the trigger
event occurs
M78
OCT (Open Collect Transistor Output) setup
By selecting a proper input source, the OCT hardware will close when the
trigger event occurs
M79 Set relay output options
M80 Select the quantitative (batch) controller to control the signal
M81 Select a quantitative (batch) controller
M82 Date totalizer
M83 Automatic supplementary power off flow switch
M84 Not used
M85 Not used
M86 Not used
M87 Not used
M88 Not used
M89 Not used
M90 Display signal strength, signal quality, time ratio on the upper right corner.
M91
Displays the Time Ratio between the Measured Total Transit Time and the
Calculated time. If the pipe parameters are entered correctly and the
transducers are properly installed, the ratio value should be in the range of
100±3%. Otherwise the entered parameters and the transducer installation
should be checked.
Displays the estimated fluid sound velocity. If this value has an obvious