Omega RD200 Series, Руководство пользователя

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17. Other Options
17.1 Shunt Resistor for Current Input
DC current input can be measured by attaching a shunt resistor (option) to the input terminals.
1 Shunt resistor (Option) and Measurement
current range
•
A shunt resistor converts the DC current input into
a DC voltage. The two types shown in the right
table are available.
•
The current measuring ranges are shown in the
right table, too.
2 Connection
Connect a shunt resister to each channel for the DC
current measurement.
Only one shunt resistor is to be connected to a
channel.
3 [Range/Printing range] and [Scale]
1) Range No.
The converted voltage with any shunt resistor is
±
5 V
DC and the range No. is “07”.
2) Printing range
Program the printing range with the value after being
converted into a voltage.
•
Minimum value:
Min. input current x shunt resistor value
•
Maximum value:
Max. input current x shunt resistor value
3) Scale
Program the scale with the physical quantity against
the input current.
•
Minimum value:
Physical quantity of the minimum input current
•
Maximum value:
Physical quantity of the maximum input current
Code
Resistance
value*
Measuring
range
EZ-RX100
100
Ω ±
50mA DC
EZ-RX250
250
Ω ±
20mA DC
Accuracy: 100
Ω
- Rated value
±
0.05%
250
Ω
– Rated value
±
0.1%
Resistan
ce value
Measuring
range
Converted
voltage
Range
No.
100
Ω ±
50mA DC
±
5VDC 07
250
Ω ±
20mA DC
±
5VDC 07
<Input to be printed with the trace printing: 4 to
20mA>
Use the shunt resistor of 250
Ω
for the
maximum measuring current of 20mA.
•
Minimum value: 4 (mA) x 250 (
Ω
) = 1 (V)
•
Maximum value: 20 (mA) x 250 (
Ω
) = 5 (V)
<Physical quantity of 4 to 20mA is 0 to 500
litter/m
2
>
•
Minimum value:
0
•
Maximum value:
500
Caution on connections
Remarks
+
-
+
-
100
Ω
or
250
Ω
CH 1
Shunt Resistor
Measuring
current source Recorder
Ex) Connection of a shunt resistor to CH1
Using Range No.
Example of printing range
Example of scale programming
Shunt resistor and measuring range