Dwyer GDL-T - Manual (Page 22)

DwyerLog User’s Guide Version 1.4x 22/33
warning if you try to start a logging session while the battery is low.
To replace the battery follow these steps:
1. Disconnect the logger from the USB cable. Do not replace the battery while the USB cable is connected!
2. Using a screwdriver, remove the screw in the back of the logger.
3. Remove the logger from the case.
4. Using a pen or a pencil, push the battery out of the casing, then use your fingers to slide the battery out
Avoid using pliers as they will short the battery.
5. Press and hold the logger button for about 2 seconds. This step removes any extraneous charge from the
logger system. This step is very important. The logger may not operate correctly if this step is not
performed.
6. Slide the new CR2032 battery into the battery case. Make sure that the + indicator on the battery matches
the + indicator on the battery case.
7. When the battery is replaced correctly, the LED will flash a single green flash for about 1 second.
8. Place the logger back in the case and replace the screw.
General guidelines as to how long a battery will last is shown in the table below. It is assumed that the logger uses a
fresh CR2032 battery, and is setup for continuous logging with rollover enabled.
Logging Interval Battery Life
1 Second
4 Months
5 Seconds 17 Months
10 Seconds 2.5 Years
30 Seconds 4.5 Years
1 Minute 6 Years
2 Minutes 7 Years
MTL-20 Specifications
Sample Point Capacity 43,344 temperature points.
Alarms Visual over and under alarm indicator for temperature.
Calibration User single point offset calibration is available through software. Calibration is
password protected.
Operating Temperature -40°F to 185°F (-40°C to 85°C)*
Storage Temperature
-40°F to 185°F (-40°C to 85°C)
Time Accuracy +/-100ppm @75°F
Temperature Accuracy +/-0.9°F (0.5°C) for the range of 0°F to 120°F (-17°C to 50°C)
Temperature Resolution 0.01°F or 0.01°C
Dimensions
3’’ x 1.6" x 0.6’’ (7.6cm x 4.0cm x 1.5cm)
Weight 1.0 oz (23g)
Power Source 3V CR2032 Lithium coin cell battery (Included)
Battery Life (average use) 6 Years
* Lithium batteries do not perform well in very low temperatures. If the logger is going to be used in temperatures
below 32°F (0°C), make sure to start with a fresh battery, and check the battery level often.
GDL Temperature Humidity Logger with Display
The GDL is a self-contained, precision instrument for recording the temperature and relative humidity of the