Dynasonics TFX Ultra Transit Time Flow Meters Manuel d'utilisateur télécharger pdf (Page 52)

MIN RATE

SETTING

MAX RATE

SETTING

SUB FLOW

SETTING

DISPLAY READING

DURING ERRORS

0.0 1000.0 0.0 0.000

-500.0 500.0 50.0 0.000

-100.0 200.0 33.3 0.000

0.0 1000.0 -5.0* -50.00

Table 11: Sample Substitute Flow Readings

SET ZERO — Set Zero Flow Point (Choice)

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.

Procedure:

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 ENTER, use the arrow  keys to make the display read YES.

4) Press ENTER.

D-FLT 0 — Set Default Zero Point (Choice)

YES

If the flow in a piping system cannot be shut off, allowing the SET ZERO procedure described above to be performed or if an

erroneous “zero” flow was captured - like can happen if SET ZERO is conducted with flowing fluid, then 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.

The default zero places an entry of zero (0) into the firmware instead of the actual zero offset entered by using the SET

ZERO procedure.

COR FTR — Correction Factor (Value)

0.500 - 1.500

This function can be used to make the flow meter agree with a different or reference flow meter by applying a correction

factor / multiplier to the readings and outputs. A factory calibrated 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:

1) The meter is indicating a ow rate that is 4% higher than another ow meter located in the same

pipe line. To make the ow meter indicate the same ow rate as the other meter, enter a COR FTR

of 0.960 to lower the readings by 4%.

2) An out-of-round pipe, carrying water, causes the ow meter to indicate a measured sound speed

that is 7.4% lower than the Table 4.5 value. This pipe condition will cause the ow meter to indi-

cate ow rates that are 7.4% lower than actual ow. To correct the ow readings, enter 1.074.

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Dynasonics TFX Ultra Transit Time Flow Meters Manuel d'utilisateur Page 52

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