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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
armstrong
international.com for up-to-date information.
105
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). Model AVI only
•
V
= Calculated average pipe velocity (ft/sec).
•
Re
= Calculated Reynolds number.
•
Profile Factor
= Factory use only.
•
Obscuration
= Factory use only.
•
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.
•
Enthalpy1 BTU/hr
= Factory use only.
•
Enthalpy2 BTU/hr
= Factory use only.
•
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.
Troubleshooting and Repair – continued