Azbil MCB10A, Руководство пользователя

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Azbil Corporation Operation using the data setting device
Model MCB10A 5-31
5-6-7 : Setting pulse scale
This function is used to set the flow rate per pulse and associated units for a
flowmeter. Pulse scale of the totalization value indicated on the display is equal to the
pulse scale set here.
Set range: 0.0001 to 99999.
However, the pulse scale should be set so that the pulse output span frequency fs
(shown in the auxiliary display) is between 0.0001 Hz and 500 Hz.
0.0001 Hz ≤ fs ≤ 500 Hz
Units of flow rate:
Unit of SI volume flow rate: m
3
, 1, cm
3
Unit of SI mass flow rate: t, kg, g
Unit of non-SI volume flow rate: mG, G, kG, B, mIG, IG, kIG
Unit of SI mass flow rate:
lb
Unit of time: d, h, min., s
Default: 10.000 m
3
/P
~Note Select the same unit systems (volume unit or mass unit) for the flow
rate range and pulse scale. Selection of different unit systems for them
will cause set errors (Err-22 PULSE WEIGHT SETTING ERROR).
(See “5-8-2 : Non-critical errorˮ on page 5-54.)
Calculation method of span frequency:
Span frequency fs can be calculated by the following formula:
fs = (Flow rate range)/(Pulse scale)
To calculate fs, pay attention to the following points:
* Convert flow range into the range per second.
* Select the same unit of flow rate for flow rate range and pulse scale.
Example) When flow rate range: 60 l/min., and pulse scale: 10 cm
3
/P:
1. Convert the flow rate range into the flow rate range per second.
60 l/min.
g
60/60 l/s
= 1 l/s
2. Select the same unit of flow rate for flow rate range and pulse
scale.
In this example, the unit of pulse scale is changed.
10 cm
3
/P
g
10/1000 l/P
= 0.01 l/P
3. Calculate the span frequency.
(1 l/P) / (0.01 l/P)
= 100 Hz
fs = 100 Hz