Dwyer GDL-T - Manual (Page 21)

DwyerLog User’s Guide Version 1.4x 21/33
MTL-30 Specifications
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 -35°F to 160°F (-31°C to 70°C)*
Storage Temperature -40°F to 170°F (-40°C to 77°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 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.
MTL-20 Temperature Logger
The MTL-20 is a self-contained, precision instrument for recording the temperature of the surrounding environment.
The MTL-20 can store up to 43,344 temperature samples.
MTL-20 Logger Status LED
Pressing the Start/Check button makes the LED flash a series of flashes to indicate the logger status. The table
below shows the different logger states that the status light can show.
Status Light Logger State
Flashed Green one time Logging is not in progress. Data in memory did not exceed the alarm
thresholds.
Flashed Red one time Logging is not in progress. Data in memory exceeded one of the alarm
thresholds.
Flashed Green four times Logging is in progress. Data in memory did not exceed the alarm thresholds
Flashed Red four times Logging is in progress. Data in memory exceeded one of the alarm
thresholds
Flashed Green-Red three times Delayed logging. Logging will start at the user specified time.
Replacing the MTL-20 Battery
The battery level of the MTL-20 can be checked using the DwyerLog software, by opening the Logger Status
window. It is suggested that the battery is replaced when the battery level reaches yellow. When the battery level
reaches red, it is imperative that the battery is replaced as soon as possible. When the battery level is too low, the
logger will stop logging automatically, resulting in data not being recorded. The DwyerLog software will give you a