<< Click to Display Table of Contents >> Navigation:  Hardware Overview > Sensors and Probes > HCD-IC > Humidity and Temperature Calibration/Adjustment > Basic Recommendations > Temperature Calibration in a Liquid Bath

Using a liquid bath is probably the best method for calibrating or adjusting a temperature probe against a certified SPRT and thermometer.

 

Stability and uniformity of temperature depend both on the design of the bath and on the type of liquid being used.

 

Prior to immersion any dust filter should be removed from the probe. Both the Pt1000 RTD and the ROTRONIC Hygromer IN1 sensor can be directly immersed without any protective shield in the Fluorinet Electronic Liquid from 3M. These liquids are an electrical insulator and have no known adverse effect on the humidity sensor. The liquid should be selected to match the temperature of calibration. For example, Fluorinet FC-77 can be used in the temperature range of -25…25°C. The boiling point is 97°C and the pour point is -110°C. Fluorinet FC-43 can

be used in the temperature range of 25…80°C. The boiling point is 174°C and the pour point is -50°C. Immersing a probe in a liquid bath disturbs the bath. Time must be allowed for the bath to stabilize (about 20 minutes). Following immersion in the Fluorinet liquid the humidity sensor takes a translucent appearance and should be allowed to dry for about 12 hours.