21 Instruction Manual
The users can employ the ESN for instrumentation management
M62
RS-232 setup. Baud rate can be 75 to 115200 bps
M63-66
Not used for the ultrasonic flow meter.
M67
Input the frequency range for the frequency output. The biggest range is
0Hz-9999Hz. Default value is 1-1001 Hz
M68
Enter a flow rate value that corresponds to lower frequency
M69
Enter a flow Rate value that corresponds to higher frequency
M70
LCD display backlight control. The entered value indicates how many
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
Not used for the ultrasonic flow meter.
M80
Work as a keypad and display for another handheld set by RS-232
connected with the handset
M81
Not used for the ultrasonic flow meter.
M82
Date totalizer
M83-89
Not used for the ultrasonic flow meter.
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.
M92
Displays the estimated fluid sound velocity. If this value has an obvious
difference with the actual fluid sound speed, pipe parameters entered and
