Panametrics PanaFlow MV80, User Manual, Page: 143 / 184

PanaFlow™ MV80, MV82 & MV84 User’s Manual 131
Chapter 5. Troubleshooting and Repair
5.1.1 Level One Hidden Diagnostics Values
• f = Vortex shedding frequency (Hz).
• fi = Adaptive filter - should be about 25% higher than the vortex shedding frequency, this is a low-pass filter. If
the meter is using the Filter Control (see below) in manual mode, fi will be displayed as fm .
• G = Gain (applied to vortex signal amplitude).
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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 MV82 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. Filter = 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.
• TOF, G, f = Factory use only.
• Sig. Rev = Signal board hardware and firmware revision.
• Miro Rev = Microprocessor board hardware and firmware revision.
• AD, R, T, F, PT, V = Factory use only.
• SPI Err, Rcv, Sent = Factory use only.
• ISR Diagnostic = Factory use only.
• Power Fail = Factory use only.
• External Power = Factory use only.
• External Alarm = Factory use only.