Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 65)

Rev. 8/02
-3. 27- TFXM
Setting Zero Flow
Because every flowmeter installation is slightly different and
sound waves can travel in slightly different ways through these
various installations, a provision is made in this entry to estab-
lish “Zero” flow—SET ZERO.
To zero the meter:
1. The pipe must be full of liquid.
2. Flow must be absolute zero—verify by closing a valve se-
curely. Allow time for any settling to occur.
3. Press ENTER, use the arrow keys to make the display read
YES.
4. Press ENTER.
5. The procedure is complete.
Reset Zero—Factory Default Zero
If the flow in a piping system cannot be shutoff, allowing the
SET ZERO procedure described above to be performed, the
factory default zero should be utilized. To utilize the D-FLT 0
function, simply press ENTER, then press an ARROW key to
display YES on the display and then press ENTER. This func-
tion can also be utilized to correct an inadvertently entered or
erroneous SET ZERO entry.
COR FTR - Universal Correction Factor
This function can be used to make the TFXM system agree
with a different or reference flow meter, by applying a correc-
tion factor/multiplier to the readings and outputs. A factory cali-
brated system should be set to 1.000. The range of settings for
this entry is 0.500 to 1.500. The following examples describe
two uses for the COR FTR entry.
?? The TFXM meter is indicating a flow rate that is 4% higher
than another flow meter located in the same pipe line. To
make the TFXM indicate the same flow rate as the other
meter, enter a COR FTR of 0.960, to lower the readings by
4%.
PART 3 - KEYPAD CONFIGURATION
Setting/
Calibrating Zero
Flow
Setting/
Calibrating Zero
Flow
Universal
Correction
Factor