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PTZ-BOX 5.0 User manual, document edition: 13
11
LF factor
–
LF input pulse rate.
In configurations with HF as main counting input (configurations: HF1, HF1/LF1, HF1/HF2, HF1/SCR,
HF1/EN) increment of volume at measurement conditions
dVm
is calculated with formula:
𝑑𝑉𝑚 =
𝑑𝐻𝐹
𝐻𝐹 𝑓𝑎𝑐𝑡𝑜𝑟
(1b)
where:
dHF
–
increment of pulses on HF input during measurement-calculation cycle,
HF factor
–
HF input pulse rate.
In configurations with EN and SCR as main counting input (configurations: EN, EN/LF1, EN/HF1, SCR,
SCR/LF1, SCR/HF1) increase of volume at measurement conditions
dVm
is calculated with formula:
𝑑𝑉𝑚 = 𝑑𝑉𝑜
(2c)
where:
dVo
–
increment of auxiliary counter
Vo
, derived from direct reading of encoder.
Increments
dVm
are summed in
Vm
counter during normal and emergency mode. During emergency
mode, additional auxiliary emergency counter of volume at measurement conditions
Vme
is driven.
1.2.6
Averaged conversion factor
A value of arithmetic average of conversion factor
C
is calculated in the device. By default,
averaged value is equal to momentary value from current measurement-calculation cycle. Averaging
of conversion factor covers the period in which flow of gas has been observed (flow rate
Qm
>0), but
in following measurement-calculation cycles increment of volume at measurement conditions
counter value
dVm
was not detected. When finally increment of that counter is detected
–
period of
averaging value of
C
ends.
E.g.
measurement-calculations cycle period is 30 seconds and increment of volume at measurement
conditions
dVm
occurs e.g. every 180 seconds (it could be correct period of incoming low frequency
pulses LF or readouts of encoder’s counter state). Counting from 0 second –
every 30 seconds device
calculates momentary value of conversion factor
C
and its averaged value. In 180
th
second, increment
of
dVm
counter will be detected and calculation of increased volume at base conditions will be
carried with use of averaged
C
. This allows to take into account of following calculations possible
dynamic changes of pressure or temperature or gas composition during period of volume increment.
1.2.7
Increment of volume at base conditions
𝑑𝑉𝑏 = 𝑑𝑉𝑚 × 𝐶
(3)
where:
dVm
–
increment of volume at measurement conditions,
C
–
conversion factor to base conditions averaged for increment period of
dVm
.
Increments
dVb
are summed up to
Vb
counter during normal operation and to
Vbe
during
emergency mode.
1.2.8
Increment of energy
𝑑𝑉𝑏 × 𝐻𝑠 = 𝑑𝐸
(4)
where:
dVb
–
increment of volume at base conditions,