Honeywell Mini-AT User Manual page 69

3) Start Mini-AT Link software on the computer.
4) Enter the access code for Level 1 or Level 2 when requested. The default Level 1 Access Code is
11111, the default Level 2 Access Code is 22222. It is strongly recommended to change the
access code at the time of installation and there after change periodically (requires Level2
Access).
5) If a communications link has not yet been established, the screen will display a box requesting the
user to input the Instrument Access Code. Enter the access code when this box appears, the default
code is 33333. It is strongly recommended to change the access code at the time of installation
and there after change periodically (requires Level2 Access).
6) Select "Calibrate" from the main menu.
7) Select "Temperature Calibration" from the sub-menu.
8) With the tip of the temperature probe lowered into the ice bath, perform the "Temperature Zero
Calibration". The temperature displayed in green on the computer's screen is a live reading. This
permits the user to determine if the temperature has stabilized so that a sample may be obtained.
Click the "Average Temperature Now" button when it becomes active (text changes from gray to
black) to obtain a sample of the temperature.
9) When Mini-AT Link displays the "Average Temperature", the value should be changed to match the
reading of the calibrated thermometer by clicking the "Change" button when it becomes active.
Enter the temperature value for the zero reference temperature (usually 32 degrees F) and then click
"OK". The Mini-AT will calculate the required difference (offset), store this calculated value at Item
Code 035, display the new value for item 035 and the previous value at item 036, before returning
to a live temperature reading.
10) Compare the displayed temperature to the reference temperature. If the Mini-AT's temperature
reading is not acceptable, click the "Average Temperature Now" button again to obtain another
temperature sample. The program will continue to loop back to the live temperature reading.
Obtain as many temperature samples as necessary until an acceptable temperature reading is
displayed.
11) If the Mini-AT's zero temperature reading is acceptable, click the "Span" button to change to the
Span Calibration sequence.
12) The screen title should have changed to; "Temperature Span Calibration". At this point, the software
is waiting to sample a temperature that exceeds the zero reference temperature by at least 10% of the
instruments's temperature range, i.e. a temperature greater than 53.0 degrees F. Insert the
temperature probe into the container of heated water.
13) The span calibration also displays a live temperature reading to allow the user to determine if the span
reference temperature has stabilized. When the temperature has stabilized, click the "Average
Temperature Now" button when it becomes active to obtain a temperature sample.
14) If the average temperature reading is not equal to the span reference temperature, click the "Change"
button when it becomes active. Enter the temperature value from the thermometer in the heated-
water bath and then click "OK". As the computer screen updates, the Mini-AT will calculate the
required span (gain), store this calculated value at Item Code 038, display the new values for items
035 and 038, display the previous values at items 036 and 039 before returning to a live temperature
reading. Obtain as many temperature samples as necessary until an acceptable span temperature
reading is displayed.
15) Compare the average temperature reading to the span reference temperature. If the average
temperature reading is acceptable, the temperature calibration process is complete. As a suggestion,
recheck the temperature zero reading and any number of temperature points within the transducer
range, or click "Done" to exit the calibration sequence.
Mini-AT User Guide
69