Gdl specifications – Dwyer GDL User Manual
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DwyerLog User’s Guide
Versin 1.2x
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8. Replace the GDL back cover and replace the 4 screws.
GDL Specifications
Text Display
Displays real time temperature, humidity and dew point. Displays logging 
summary, sample rate, memory used and memory left. 
Graph Display
Shows measurement trends graphically. Graph can be scrolled through the entire 
logged data. 
Sample Point Capacity
43,344 points for temperature only. 21,672 points for temperature, humidity and 
dew point. 
Alarms
Visual over and under alarm indicator for temperature and humidity. Dew point 
alarms are not available 
Calibration
User single point offset calibration is available through software for both 
temperature and humidity. Calibration is password protected. 
Operating Temperature
15°F to 150°F (-10°C to 65°C)
Storage Temperature
-5°F to 160°F (-20°C to 70°C)
Time Accuracy
+/-100ppm @75°F
Relative Humidity Range 0% to 99%RH, non condensing. 
Relative Humidity 
Accuracy 
+/- 2%RH, from 10% to 90% RH
Relative Humidity 
Resolution 
0.01%RH
Temperature Accuracy
+/-1°F (0.5°C)
Temperature Resolution
0.01°F or 0.01°C
Dimensions
4’’ x 3.05" x 1.5’’ (10.2cm x 7.7cm x 3.8cm)
Weight
7.0 oz (200g)
Power Source
Three AA batteries (Included)
Battery Life
1 year continuous use, 2 years average use. The logger automatically turns itself 
Off after 1 hour, when not logging. Turn On by pressing any button. 
 
 
