Omega RD200 Manual de usuario descargar pdf (Pagina 106)

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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

100Ω ±50mA DC

EZ-RX250

250Ω ±20mA DC

Accuracy: 100Ω - Rated value ±0.05%

250Ω – Rated value ±0.1%

Resistan

ce value

Measuring

range

Converted

voltage

Range

No.

100Ω ±50mA DC ±5VDC

250Ω ±20mA DC ±5VDC

<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

Caution on connections

Remarks

100Ω or

250Ω

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

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 133 134

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Omega RD200 Manual de usuario Pagina 106

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