Other Options - Omega RD2800 Series User Manual

17. Other Options

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.
Remarks
Caution on connections
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
17.1 Shunt Resistor for Current Input
Shunt resistor and measuring range
EZ-RX100
EZ-RX250
Accuracy: 100Ω - Rated value ±0.05%
Ex) Connection of a shunt resistor to CH1
current source
Resistan
ce value
100Ω
250Ω
<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
• Minimum value: 0 • Maximum value: 500
－１０２－
Resistance
Code
value*
100Ω
250Ω
250Ω – Rated value ±0.1%
Measuring
+
-
100Ω or
250Ω
Shunt Resistor
Using Range No.
Measuring Converted
range voltage
±50mA DC ±5VDC
±20mA DC ±5VDC
Example of printing range
Example of scale programming
2
>
Measuring
range
±50mA DC
±20mA DC
Recorder
+
CH 1
-
Range
No.
07
07