Onicon F-2600 Instrukcja Użytkownika Pobierz pdf (Strona 105)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 105

Record values - Hidden Diagnostics Menu continued:

With Flow With No Flow (if possible)

Pe(V) =

Pv(V) =

Ck =

Lvl =

Adj. Filter =

Iso. Power Volts =

Sig. Rev =

Record the following values from the Calibration Menu:

Vortex Coef Ck =

Low Flow Cutoff =

5.6 DETERMINE THE FAULT

5.6.1 Symptom: Output at no Flow

1. The low ow cutoff is set too low. At no ow, go to the rst level of the hidden

diagnostics menu and record the Lvl value. The low ow cutoff must be set above this

value.

2. Example: At no ow, Lvl = 25. Set the low ow cutoff in the Calibration Menu to

approximately 28 and the meter will no longer read a ow rate at no ow.

5.6.2 Symptom: Erratic Output

1. The ow rate may be too low, just at the cutoff of the meter range, and the ow cycles

above and below the cutoff making an erratic output. Consult the factory if necessary

to conrm the meter range based on current operating conditions. It may be possible to

lower the low ow cutoff to increase the meter range. See the example above for output

at no ow, only this time the low ow cutoff is set too high. You can lower this value

to increase the meter range as long as you do not create the output at no ow condition

previously described.

2. Mechanical installation may be incorrect. Verify the straight run is adequate as

described in Section 2. For in-line meters, make sure the meter is not installed

backwards and there are no gaskets protruding into the ow stream. For insertion

meters, verify the insertion depth and ow direction.

3. The meter may be reacting to actual changes in the ow stream. The output can be

smoothed using a time constant. The displayed values can be smoothed using the time

constant in the Display Menu. The analog outputs can be smoothed using the time

constant in the Output Menu. A time constant of 1 will result in the change in value

reaching 63% of its nal value in one second. A time constant of 4 is 22%, 10 is 9.5%

and 50 is 1.9% of the nal value in one second. The time constant equation is shown

below (TC = Time Constant).

% change to nal value in one second = 100(1 -e

(1/TC)

)

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 130 131

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