Correcting The Upper Range Value (Urv); Resetting Calibration - Honeywell STT850 Series User Manual

7.3.2 Correcting the Upper Range Value (URV)

Assuming that you have just finished the LRV correct, then select the My Device menu, and choose
one of the following options:
1. Select the My Device menu, and choose one of the following options:
a. Device Setup \ Calibration \ Calibration Methods \ Sensor (1 or 2) URV Correct
2. You will be prompted to remove the loop from automatic control. After removing the loop
from automatic control, press OK.
3. When prompted, adjust the temperature source to apply value equal to the Upper Calibration
Point, and press OK.
4. When the temperature stabilizes, wait for 5 seconds, then press OK.
5. When prompted, remove temperature.
6. On the next prompt – "Please enter Calibration Date in MM/DD/YYYY format. Enter the
Calibration date (for example "05/27/2009") and press Enter.
On the next prompt - "Please enter the current calibration time in 24 Hr format (Hours
7.
Field)", enter the Hours field HH (for example, "12"), and press ENTER
8. On the next prompt – "Please enter current Calibration Time (Minute field)," enter the
Minutes field MM (example "23"), and press ENTER.
9. When prompted to return the loop to automatic control, press ENTER
Note: When working with a Dual Input transmitter which has been configured for Differential
Input mode: Apply the Lower Calibration Point input and Upper Calibration Point input to both
inputs at the same time while performing the LRV and URV Corrects. Corrects will occur on
individual sensor readings when in Differential mode.

7.3.3 Resetting Calibration

STT850 SmartLine HART Temperature Transmitter can erase incorrect calibration data by
resetting the device back to final factory calibration, which is performed per the ordered range.
The Corrects Reset command returns the zero and span calibration factors to the original precise
factory calibration.
The following procedure is used to reset calibration data to factory calibrated range using the
communicator.
1. Connect the MC Toolkit per figure 6 across the loop wiring and turn on.
2. Turn the MC Toolkit on, start the FDC application.
3. On the FDC Home page, select Online, and establish communication with the Transmitter.
4. Select the My Device menu, and choose from the following selections:

Device Setup \ Calibration \ Calibration Methods \ Reset Corrects (Sensor1 or
Sensor2)
5. You will be prompted to remove the loop from automatic control. After removing the loop
from automatic control, press OK.
6. You will be notified that a Reset Corrects is about to occur. Press OK
7. When the message "Reset Corrects OK" appears, press OK. The previous calibration
"Corrects" are removed and calibration is reset to the factory values.
8. When prompted to return the loop to automatic control, press OK
Page 80
STT850 Series HART/DE Option User's Manual
Revision 4.0