Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 76)

Rev. 5/09
-3.38- TFXP
Setting/
Calibrating
Zero Flow
SET ZERO -- Calibrating Zero Flow (Choice)
1. No
2. Yes
Because every flow meter installation is slightly different and sound
waves can travel in slightly different ways through these various
installations, it is important to remove the zero offset at zero flow to
maintain the meter’s accuracy. A provision is made using this entry
to establish “Zero” flow and eliminate the offset.
To zero the meter:
1. The pipe must be full of liquid.
2. Flow must be absolute zero – securely close any valves and
allow time for any settling to occur.
3. Press EDIT at the Set Zero prompt, use the arrow keys to make
the display read Yes.
4. Press ACCEPT.
The procedure is complete.
D-FLT 0 -- Setting a Zero Flow Point (Choice)
1. No
2. Yes
If the flow in a piping system cannot be shut off, allow the Set Zero
procedure described above to be performed, then the default zero
should be utilized. This procedure places an actual value of zero in
MINIMUM
RATE SETTING
MAXIMUM
RATE SETTING
SUBSTITUTE
FLOW SETTING
DISPLAY
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
* NOTE: ULTRALINK ™ is required to set values outside of 0.0 - 100.0.
Table 3.8 — Typical Zero Settings
Factory
Default Zero
Calibration
PART 3 - KEYPAD CONFIGURATION