Installation guide
58
www.cooperbussmann.com/BussmannWirelessResources
Cooper Bussmann BU-905U-L Wireless I/O Configuration Manual
Selecting Thermocouple Tables
BU-Config 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 20mA (High).
BU-Config 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:
T
able 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 4-20mA.
E, J, K, or T The BU-905U-L-T has built-in linearization tables and cold-junction
Tables 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 4mA output.
High is the value that corresponds to a 20mA output.
3A1579Rev1.4