Omega FDT-25 User Manual page 29

FDT-25 Handheld
M87 Not used
M88
Not used
M89
Not used
M90 Display signal strength, signal quality, time ratio on the upper right corner.
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,
M91
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 difference with
M92 the actual fluid sound speed, pipe parameters entered and the transducer installation
should be checked again.
Displays total transit time and delta time(transit time difference)
M93
Displays the Reynolds number and the pipe factor used by the flow rate program.
M94
Not used
M95
M96
Not used
Command to record the pipe parameters entered by the user either to the built-in data
M97
logger or to RS-232C serial interface
Command to record the diagnostic information either to the built-in data logger or to
M98
RS-232C serial interface
Command to copy the current display either to the built-in data logger or to RS-232C
M99
serial interface
Browse the 64 recorded instrument power-on and power-off date and time with the flow
M+0
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)
A scientific calculator for the convenience of field working.
M+5 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
Ultrasonic Flowmeter 25