Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 64)

Rev. 8/02
-3. 26- TFXM
Signal Strength Cutoff
Signal Strength Cutoff SIG C-OF is used to drive the flowmeter
and its outputs to a zero flow state should conditions occur that
cause low signal strength. A signal strength indication of be-
tween 0.5 and 0.8 is considered to be inadequate for measur-
ing flow reliably, so typical settings for SIG C-OF are in the
range of 1.0 to 2.0.
Substitute Flow
Substitute Flow or SUB FLOW is a value that the analog out-
puts will be driven at when an error condition in the flowmeter
occurs. Typical settings are either –5% or 105% - a value out-
side of the normal operating range that can be used to indicate
a fault condition to the target device.
PART 3 - KEYPAD CONFIGURATION
Signal Strength
Cutoff
MIN RATE
SETTING MAX RATE
SETTING
SUB FLOW
SETTING
DISPLAY
READING READING
DURING ERRORS
0.0 1,000.0 0.0 0.000
-500.0 500.00 50.0 0.000
-100.0 200.0 33.3 0.000
0.0 1,000.0 -5.0* -50.00
Substitute Flow
Entry
Signal Strength indication of 0.5 to 0.8 is considered to be no
signal at all. Verify that the pipe if full of liquid, the pipe size and
liquid parameters are entered correctly and that the transducers
have been mounted accurately.