Weidmuller WI-I/O 9-L: Wireless I/O Transmitter / Receiver v1 Manual de usuario descargar pdf (Pagina 77)

WI-I/O 9-L Configuration Manual

WI-I/O 9-L Wireless I/O page 77 of 108

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WI Series lets you set the thermocouple that you want to use with your module

The thermocouple measurement system works in conjunction with the on-board cold-junction

temperature measurement to provide cold-junction compensation using the following options:

 Enable Cold Junction Compensation - this option is normally selected unless you

are using an external cold junction compensation circuit.

 Enable Post Linearization Scaling - lets you to change the range of temperature

reported by the thermocouple system. This is a scale factor applied after linearizing the

thermocouple voltage to a temperature range.

If you are using one of the default thermocouple types, you can set the display format

to “Low and High value”, then enter the temperature you want to correspond to 4mA

(Low) and the temperature that you want to correspond to 20 mA (High).

WI Series automatically configures the Cold Junction and Linearization tables for supported

thermocouple types.

To set thermocouple tables:

1. Open the project.

2. Select the unit you want to change.

3. Select Tables.

4. Select the table required:

Table type Description Example

Millivolt input

Automatically disables cold junction

compensation and bypasses the

thermocouple linearization table.

Post linearization scaling is set to

(16384,1.00) to scale the range 0-100 mV to

correspond to an output value of 4-20 mA.

E, J, K, or T

tables

The WI-I/O 9LT has built-in linearization

tables and cold-junction compensation tables

for E, J, K and T type thermocouples.

Select the desired thermocouple type.

You should normally select Enable

temperature compensation. You should de-

select this option if using an external

compensation circuit.

By default, the linearized data is scaled to

correspond to the normal range of the

thermocouple.

To select a different output range, select

Enable Post Linearization Scaling and

enter a different Low and High value.

Low is the temperature that corresponds to a

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Weidmuller WI-I/O 9-L: Wireless I/O Transmitter / Receiver v1 Manual de usuario Pagina 77

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