
SuperNova PD500 PID Process & Temperature Controllers
Instruction Manual
7
Engineering Unit Descriptions
During the programming of the controller, there are two types of engineering units referred to, EU, and EUS.
EU:
The value in engineering units according to the input range.
EUS:
The value in engineering units according to the full span of the input.
Engineering Units (EU)
A parameter or other value defined in EU is defined in the actual absolute engineering unit value of the input type (or
scaled engineering units for the case of voltage or current inputs).
This means the EU value takes on the actual engineering unit value, which may be negative in some cases.
In the example below, the controller has been programmed for a type J thermocouple. A type J thermocouple has a
range of -200°C (FR.L) to 1200°C (FR.H). Any parameter or value using EU unit definitions could be defined in values
from -200°C to 1200°C.
If the parameter or value is defined in EU, but listed as a percentage (EU %), 0% represents the value of -200°C and
100% represents a value of 1200°C.
Engineering Unit Span (EUS)
A parameter or other value defined in EUS is defined in the actual engineering units of the input type (or scaled
engineering units for the case of voltage or current inputs) but represents the span value in those engineering units.
This means the EUS value is defined in engineering units, but begins at 0, representing the low range of input (FR.L
or SL.L) and will not be a negative value, regardless of the actual input range.
In the example below, the controller has been programmed for a type J thermocouple. A type J thermocouple has a
range of -200°C (FR.L) to 1200°C (FR.H), but a span of 1400°C. Any parameter or value using EUS unit definitions
could be defined in values from 0°C to 1400°C.
If the parameter or value is defined in EUS, but listed as a percentage (EUS %), 0% represents the value of 0°C and
100% represents a value of 1400°C.