ONICON F-2600 - Manual (Page 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)
• fi = Adaptive filter – should be approximately 25% higher than the vortex shedding
frequency. This is a low-pass filter. If the meter is using the Filter Control (see below)
in the manual mode, fi 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
flow increases. When stage A1 reaches 512, it will shift to stage A2. This will continue
as the flow rate increases until all 4 stages read 512 at high flow rates. Higher flow
rates (stronger signal strength) will result in more stages reading 512.
• Kc, It, Kb = Profile 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 fluid at standard conditions
• Nrml = Density of fluid at normal conditions
• Viscosity = Calculated viscosity of flowing fluid
• 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 fi value (see above). If the Ck is
set too low (in the calibration menu), then the fi value will be too low and the vortex
signal will be rejected resulting in zero flow 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 flow. The Lvl level can be checked at no flow. At
no flow, the Lvl must be below the Low Flow Cutoff setting or the meter will have an
output at no flow.
• Adj. Flilter = Adjustable filter. Displays the filtering 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 flow 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 flow 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.