Onicon F-2600 Manual do Utilizador descarregar pdf (Página 101)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 101

5.1.1 LEVEL One Hidden Diagnostics Values

• f = Vortex shedding frequency (Hz)

•  = Adaptive lter – should be approximately 25% higher than the vortex shedding

frequency. This is a low-pass lter. If the meter is using the Filter Control (see below)

in the manual mode,  will be displayed as fm.

• G = Gain (applied to vortex signal amplitude). Gain defaults to 1.0 and can be

changed using the Gain Control (see below).

• A = Amplitude of vortex signal in Volts rms

• A1, A2, A3, A4 = A/D counts representing the vortex signal amplitude. Each stage

(A1-A4) cannot exceed 512. Beginning with stage A1, the A/D counts increase as the

ow increases. When stage A1 reaches 512, it will shift to stage A2. This will continue

as the ow rate increases until all 4 stages read 512 at high ow rates. Higher ow

rates (stronger signal strength) will result in more stages reading 512.

• Kc, It, Kb = Prole equation (factory use only). Insertion style only

• V = Calculated average pipe velocity (ft/sec)

• Re = Calculated Reynolds number

• RTD1 = Resistance value of integral RTD in ohms

• RTD2 = Optional RTD resistance value in ohms

• Pe(v) = Pressure transducer excitation voltage

• Pv(v) = Pressure transducer sense voltage

• Stnd = Density of uid at standard conditions

• Nrml = Density of uid at normal conditions

• Viscosity = Calculated viscosity of owing uid

• x Cnts = A/D counts from the external 4-20 mA input

• Ext x.xxx mA = Calculated external 4-20 mA input from the digital counts

• Ck = Calculated Ck at current operating conditions. Ck is a variable in the equation

that relates signal strength, density, and velocity for a given application. It is used

for noise rejection purposes. Ck directly controls the  value (see above). If the Ck is

set too low (in the calibration menu), then the  value will be too low and the vortex

signal will be rejected resulting in zero ow rate being displayed. The calculated Ck

value in this menu can be compared to the actual Ck setting in the calibration menu to

help determine if the Ck setting is correct.

• Lvl = Threshold level. If the Low Flow Cutoff in the calibration menu is set above

this value, the meter will read zero ow. The Lvl level can be checked at no ow. At

no ow, the Lvl must be below the Low Flow Cutoff setting or the meter will have an

output at no ow.

• Adj. Flilter = Adjustable lter. Displays the ltering in decibels. Normally reads zero.

If this value is consistently -5 or -10, for example, the Ck or density setting may be

wrong.

• Iso. Power Volts = Nominally 2.7 VDC. If less than this, check the ow meter input

power.

• O,I = Factory use only

• Pulse Out Queue = Pulse output queue. This value will accumulate if the totalizer

is accumulating faster than the pulse output hardware can function. The queue will

allow the pulses to “catch up” later if the ow rate decreases. A better practice is to

slow down the totalizer pulse by increasing the value in the (unit)/pulse setting in the

totalizer menu.

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