FDT-25
Handheld
Ultrasonic Flowmeter
25
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.
M92
Displays the estimated fluid sound velocity. If this value has an obvious difference with
the actual fluid sound speed, pipe parameters entered and the transducer installation
should be checked again.
M93
Displays total transit time and delta time(transit time difference)
M94
Displays the Reynolds number and the pipe factor used by the flow rate program.
M95
Not used
M96
Not used
M97
Command to record the pipe parameters entered by the user either to the built-in data
logger or to RS-232C serial interface
M98
Command to record the diagnostic information either to the built-in data logger or to
RS-232C serial interface
M99
Command to copy the current display either to the built-in data logger or to RS-232C
serial interface
M+0
Browse the 64 recorded instrument power-on and power-off date and time with the flow
rate at the time of power on and off
M+1
Displays the total working time of the instrument
M+2
Displays the last power-off date and time
M+3
Displays the last power-off flow rate
M+4
Displays the times of instrument powered on(the instrument has been powered on)
M+5
A scientific calculator for the convenience of field working.
All the values are in single accuracy.
The drawback is that the user can’t operate it by direct key-pressing
M+6
Not used
M+7
Not used
M+8
Not used
M+9
Not used
M-0
Entry to hardware adjusting windows only for the manufacturer
