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Figure 12 – PSI Engineering Unit Scaling Example for 0.1MPa Range ITV
Example: Suppose you have a 0.9 MPa ITV unit and you want to use PSI engineering units. The
range of the unit in PSI is 0.03 PSI to 130.53 PSI. Making sure the engineering units are enabled
with PSI selected, then if you wish to send 82.4 PSI refer to the table above for 0.9 MPa unit noting
the multiplier for PSI - as you can see, it is 100; so multiply 82.4 by 100 and you get 8240. Set the
setpoint to 8240 (0x2030). Remember, you need to know what to multiply the set point by for
engineering units and that is determined by what ITV unit type you're using and what engineering
units you wish to send.
18.5. Engineering Units as Feedback
When an engineering unit is selected as outlined above, the unit type that was selected will be the
units used for the pressure feedback. As with the pressure set point multiplier that was needed to
be applied, the same multiplier will need to be applied on the pressure feedback. Example: if the
ITV unit is a 0.5 MPa unit and the units selected is kPa, then the multiplier is 100. So, if the feedback
value is 3825, then the pressure feedback is 3825/100 or 38.25 kPa.
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