20 of 28
Operating Manual: ULT25NE 10327.1 | 12.22.2016
8. Calibration Guide
Calibrating the RTD with an Independent Temperature Indicator
The Shuttle ULT25NE’s Resistance Temperature Device (RTD) is factory calibrated to
display both setpoint and operating temperature from a single internal RTD. In the
event that you must recalibrate the Shuttle to match the reading of an independent
temperature recording device or stand-alone electronic thermometer, please follow
this process.
1. Tools Required
• Flashlight or work light
• Long handled (6-7”), plastic, Phillip’s or flathead screwdriver
(Do not use a metal screwdriver as this may short circuit the circuit board in the event of a slip.)
• Independent Thermocouple and RTD Thermometer with sufficient lead wire to pass
through the 1/8" access port and affix to the vertical liner channel.
• Tape
2. Procedure
1. Place a thermocouple (1) inside the Shuttle cabinet.
— Note: Display temperature is calibrated using a NIST traceable
thermocouple located in the center of the cabinet (4.4” from back, 6.6”
from left side, 6.7” from bottom).
2. Turn Shuttle on.
3. Set temperature to -80
º
C.
4. Wait until the display reads -80
º
C.
— For best results wait an additional hour to ensure uniform cabinet
temperature.
5. Connect a NIST traceable thermocouple reader (2) to the thermocouple
located inside the cabinet.
6. Slide open filter door located on the side of the cabinet (3).
7. Using an extra-long screwdriver (4) locate the potentiometer through filter
opening (5).
8. Turn the adjustment screw until the Shuttle display temperature is the same
as the hand-held instrument. ¼ Turn = 3 DEGREES
9. Turn the screw to change the temperature indicated on the display
(clockwise for warmer and counter-clockwise for colder).
10. After making an adjustment, WAIT 15 SECONDS for the Shuttle’s indicated
temperature to register the adjustment. Repeat adjustment if necessary.
11. Calibration complete.
To Next Page
Loading...