Two Point Calibration; Clearing Calibration - Honeywell SmartLine STIW400 User Manual

7. Operation
7.5. Calibrating the transmitter

Two Point Calibration

For Two Point Calibration, the user applies two known inputs to the transmitter channel, one
High and one Low. At each point the User will enter the known input value into either CAL
POINT HIGH or CAL POINT LOW in the Calibration interface in the WDM, and then set Cal
Cmd to the appropriate command, either CAL UPPER or CAL LOWER. The device will take
measurement of the process at each of these two points and once BOTH have been completed,
the transmitter will calculate a Slope and an Offset to apply to the PVs based on the known input
values entered by the user, and the measured values for those inputs. If the slope is > 1.05 or less
than 0.95 then the status will be SUCCESS WITH EXCESS, indicating that the slope is outside
of the expected corrective range and the user may want to check there was no mistake made
during the calibration process. If everything is ok then the status will be SUCCESS and the Cal
Source will change to USER.

Clearing Calibration

To clear any previously performed Calibration the user should select CAL CLEAR from the Cal
Cmd input and hit apply. This will remove any performed user calibration from affecting the PV.
58 SmartLine Wireless Temperature and Universal I/O User's Manual
1. Select the transmitter channel in the WDM interface.
2. Esnure the transmitter channel mode is Out of Service.
3. Set the process input to the transmitter high or upper value. (If desired,
the low value can be applied first).
4. In the Calibration Menu set "Cal Cmd" to "Cal Upper" and press Apply.
5. Set the process input to the transmitter low value.
6. In the Calibration Menu set "Cal Cmd" to "Cal Lower" and press Apply.
1. Select the transmitter channel in the WDM interface.
2. Ensure the mode is Out of Service.
3. In the Calibraiton menu change "Cal Cmd" to "Cal Clear" and press
Apply.
4. Ensure the the Cal Source changes to "None"
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