Model 2000 Flow Computer Instruction Manual
2.0
GENERAL
DESCRIPTION
Model 2000 issue 21
Page No
24
2) If
3
BR
>
and
100
10
impw
Q
3600
BR
max
<
≥
×
×
Then a BR Check will occur every 10 Monitor input (LF) pulses or every
BR
11
×
Meter input (HF) pulses.
An Accountable alarm
turbN hf An hf turbine meter alarm (blade failure) will be generated if
(
)
04
.
0
Meter
Meter
)
BR
Monitor
(
+
≥
−
×
A Non accountable alarm
turbN lf An lf turbine meter alarm (blade failure) will be generated if
(
)
04
.
0
Meter
Meter
)
BR
Monitor
(
−
≤
−
×
Where
Monitor
: Number of Monitor pulses in time period.
Meter
: Number of Meter pulses in time period.
BR :
Blade
Ratio
3)
For all other conditions a BR Check will occur every 100 Monitor input (LF) pulses or every
BR
110
×
Meter
input (HF) pulses.
An Accountable alarm
turbN hf An hf turbine meter alarm (blade failure) will be generated if
04
.
0
Monitor
BR
Meter
Monitor
+
≥
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⎟
⎠
⎞
⎜
⎝
⎛
−
A Non accountable alarm
turbN lf An lf turbine meter alarm (blade failure) will be generated if
04
.
0
Monitor
BR
Meter
Monitor
−
≤
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⎟
⎠
⎞
⎜
⎝
⎛
−
Where
Monitor
: Number of Monitor pulses in time period.
Meter
: Number of Meter pulses in time period.
BR :
Blade
Ratio
The following special conditions will apply for indication of BR alarms:-
a)
If the uncorrected flow rate is less than the value of the low flow alarm then the blade failure alarm is
inhibited
from
operating.
b)
The blade failure alarm may be switched off by entering zero for the value of blade ratio BR
(used where the turbine meter has only one sensor).
c)
The result from the next test period carried out after any of the following conditions will not be
used to indicate an alarm condition. Any alarm condition will not be indicated until the end of the
subsequent
test
period:-
i)
Immediately following a Power On condition.
ii)
Immediately following the flow increasing above the Low flow level.
iii)
Immediately following a change of BR, Qmax or impw value.
Summary of Contents for 2000
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