Model 2000 Flow Computer Instruction Manual
2.0 GENERAL DESCRIPTION
Model 2000 issue 21 Page No
23
2.4.1.4. BLADE FAILURE DETECTION
Turbine Meter blade failure check is accomplished by comparing the pulses from sensors on the turbine meter and turbine
monitor wheels or from two sensors on the turbine meter wheel. The ratio of pulses from the turbine meter sensor and
turbine monitor sensor is entered as the BR and is defined as the blade ratio.
segmentsmonitor ofNumber
blades turbine ofNumber
= Ratio Blade
The time periods that the BR check will be done over depends upon the values set for the following parameters:-
BR Blade Ratio.
Qmax Maximum Meter flow in m3/hr.
impw Meter HF impulse factor.
1) If
3BR >
and
100
impwQ
3600BR
max
≥
×
×
Then a BR Check will occur every 1 Monitor input (LF) pulse or every
B
2
Meter input (HF) pulses which ever occurs
first
An Accountable alarm
turbN hf An hf turbine meter alarm (blade failure) will be generated if
()
04.0
Meter
Meter)BRMonitor(
+≥
−×
A Non accountable alarm
turbN lf An lf turbine meter alarm (blade failure) will be generated if
()
04.0
Meter
Meter)BRMonitor(
−≤
−×
Where
Monitor : Number of Monitor pulses in time period.
Meter : Number of Meter pulses in time period.
BR : Blade Ratio
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