Sierra INNOVA-FLO 220 - Manual (Page 53)

Chapter 5 Troubleshooting & Repair Series 220/221 Instruction Manual
Column One Hidden Diagnostics Values
•
f = vortex shedding frequency (Hz). If an asterisk (*) is dis-
played after the f value, a valid vortex signal is being registered
for the flow.
•
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 the 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 rate in-
creases. 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 displaying 512.
•
Kc, It, Kb = profile equation (factory use only). Series 221
only.
•
V = calculated average pipe velocity (ft/sec).
•
Re = calculated Reynolds number.
•
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 rejec-
tion 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 cali-
bration menu to help determine if the Ck setting is correct.
•
Lvl = threshold level. If the Low Flow Cutoff in the calibra-
tion 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. Filter = adjustable filter. Displays the filtering in deci-
bels. Normally reads zero. If this value is consistently –5 or
–10, for example, the Ck or density setting may be wrong.
•
O, I = factory use only.
5-2 IM-22