LEFM 3xxCi User Manual
IB1406 Rev 12
Section 6
Page 38
August 2017
Operations
Definitions
SNR – Signal to Noise Ratio
Gain – Required gain to amplify signal
Rejects – Percentage of Data Rejects due to low SNR
VOS – Velocity of Sound
IOP – Input Output and Power Board
CTC – Control and Timing Card
MXR – Multiplexer, Transmitter and Receiver Card
Normal Operating Conditions
If the LEFM is properly installed, the display will begin working when power is supplied to the unit. Two LED
indicators, one showing a valid power connection and the other showing the meter is in a “RUN” mode, will
illuminate, and the display will show readouts of flow total, flow rate, fluid properties and basic acoustic
diagnostic information. If more detailed diagnostic data is needed beyond what is available via the display,
consider accessing transmitter diagnostic data via the LEFMLink software.
Except when troubleshooting, do not remove the enclosure covers from the transmitter. The
diagnostic information is easily read from the display with the covers in place.
Display LEDs
The typical statuses of the LEDs are as follows. (Refer to Section 8, Troubleshooting and Diagnostics for
troubleshooting information.)
Table 6.1 LED Diagnostics
LED Number
Color (Typical)
Indication
Normal State
1
Green
Power on
On
2
Green
Operation
On
WARNING
