NOSHOK 920 Series RTD Transmitter Software User Manual - Manual (Page 8)

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To re-scale the RTD Transmitter in a range that is not included in the “Preset
Range”, simply enter the value, in the current engineering units, that corresponds to
a reading of 4 mA and 20 mA, in their respective text boxes. To apply this new
range, click on the “SET” button located in the OPERATION RANGE section. Once
the new range is set, the “Actual Reading”, located in the bottom right of the
Programming window, will be updated with the new values.
If the selected range is out of the construction limit of the RTD Transmitter an error
message will appear on the screen and the RTD Transmitter will not accept this new
setting.It is important to note that changing the range and/or engineering units will
not affect the calibration previously done.
Clicking on the “Reset to Factory” button will re-program the RTD Transmitter with
its range and calibration values as they were set at the factory according to the
customer specifications.
Current Adjustment:
The current adjustment feature permits a verification/adjustment of the current
output against a current loop indicator independent of the sensor temperature. It can
also be used for troubleshooting by simply forcing the output of the RTD Transmitter
to its 4.00 mA or 20.00 mA values.
The RTD Transmitter current output is already adjusted at the factory against a high
accurately current indicator. If the user wants a perfect match between his loop
current indicator and the RTD Transmitter, he can re-adjust the output. This is
performed by first clicking on the “4 mA” button located in the CURRENT
ADJUSTMENT section of the Programming window. This will force the RTD
Transmitter output to the theoretical value of 4.00 mA. Once the button is pressed, a
small dialog box appears on the screen ( Figure 3-A) allowing the user to set the
output current, by clicking on the “+” or “-” button, to read exactly 4.00 mA on his
loop current indicator. When the indicator reads 4.00 mA then click on the “Set”
button to record the new value in the RTD Transmitter
Figure 3-A Figure 3-B
920_Prog Txr
User’s Manual – Preliminary Version