YOKOGAWA SMARTDAC+ GM, Техническая информация

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3-2
TI04L55B01-01EN
Pulse measurement
Using digital input and digital input/output modules, you can measure pulses of flow rates, rain
gauges, and the like (250
1
Hz max., minimum pulse width: 2 ms).
To perform pulse measurements, the GM10 needs to have the computation (/MT) option.
1 When chattering filter is off. 125 Hz when chattering filter is on.
Using pulse input module, you can sum
2
pulses of flow rates, rain gauges, and the like (20KHz
max., minimum pulse width: 25 µs).
2 To perform pulse sum computation, the GM10 needs to have the computation (/MT) option.

Input Calculation
The following calculations can be performed on input signals.
l
Linear scaling
Converts the input value unit to obtain the measured value.
For example, linear scaling is used to convert the output signal from a temperature converter into
temperature values.
Input value
Measured value
10 V
0 V
300°C
–100°C
l
Delta
The measured value of the channel is set to the difference with respect to the measured value of
the reference channel.
For example, this is useful when you want to measure the temperature difference in reference to
the room temperature.
Input value Measured value
Measured value on the reference channel
—
l
Square root computation
Takes the square root of the input value and converts the unit to obtain the measured value.
In a differential pressure flowmeter, the output signal is proportional to the square of the flow rate.
Therefore, to measure on a GM, square rooting is required.
Input value
Measured value
a
b
x
a b
B
B
X
A
A
X = (B – A) + A
x – a
b – a
l
Low-cut
Set the low-cut value for square rooting.
Input value
Measured value
Result of square root computation
Low-cut value
l
Log scale (/LG1)
The GM supports Log input, pseudo log, and log linear input.
For details on the function, see section “3.2.1 Alarm Function” on page 3-15.