MAJOR TECH MT668 Temperature and Humidity Data Logger Instruction Manual
- June 9, 2024
- MAJOR TECH
Table of Contents
MAJOR TECH MT668 Temperature and Humidity Data Logger
FEATURES
- Memory for 32,000 readings (16 000 temperature and 16 000 humidity readings)
- Dew point indication
- Status Indication
- USB Interface
- User-Selectable Alarm
- Analysis software
- Multi-mode to start logging
- Long battery life
- Selectable measuring cycle: 2s, 5s, 10s, 30s, 1m, 5m, 10m, 30m, 1hr, 2hr, 3hr, 6hr, 12hr, 24hr
INSTRUMENT LAYOUT
- Protective cover
- USB connector to PC port
- Start button
- RH and Temperature sensors
- Alarm LED (red/yellow)
- Record LED (green)
- Mounting clip LED STATUS GUIDE
LED STATUS GUIDE
-
To save power, the logger’s LED flashing-cycle can be changed to 20s or 30s via the supplied software.
-
To save power, alarm LEDs for temperature and humidity can be disabled via the supplied software.
-
When both temperature and relative humidity readings exceed alarm level synchronously, LED status indication alternate every cycle. For example: If there is only one alarm, the REC LED blinks for one cycle and alarm LED will blink for next cycle. If there are two alarms, REC LED will not blink. First alarm will blink for first cycle and the next alarm will blink for next cycle.
-
When the battery is low, all operations will be disabled automatically.
NOTE: Logging automatically stops when the battery weakens (logged data will be retained). The supplied software is required to restart logging and to download logged data. -
To use the delay function. Run the data logger Graph software, click on the computer icon on the menu bar (2nd from left) or select LOGGER SET from the LINK pull-down menu. The Setup window will appear, and you will see there are two options: Manual and Instant. If you select the Manual option, after you click the Setup button, the logger will not start logging immediately until you press the yellow button in logger’s housing.
SPECIFICATIONS
Relative Humidity
Temperature
Dew point Temperature
General
BATTERY REPLACEMENT
Only use 3.6V lithium batteries. Before replacing the battery, remove the model from the PC. Follow diagrammatic and explanation steps 1 through 4 below:
- With a pointed object (e.g. a small screwdriver or similar), open the casing. Lever the casing off in the direction of the arrow.
- Pull the data logger from the casing.
- Replace/Insert the battery into the battery compartment observing the right polarity. The two displays briefly light up for control purposes (alternating, green, yellow, green).
- Slide the data logger back into the casing until it snaps into place. Now the data logger is ready for programing.
NOTE:
Leaving the model plugged into the USB port for longer than necessary will
cause some of the battery capacity to be lost.
WARNING: Handle lithium batteries carefully, observe warnings on battery casing. Dispose of in accordance with local regulations.
SENSOR RECONDITIONING
Over time, the internal sensor may be compromised because of pollutants,
chemical vapors, and other environmental conditions which can lead to
inaccurate readings. To recondition the internal sensor, please follow the
procedure below: Bake the Logger at 80°C (176°F) at <5%RH for 36 hours
followed by 20- 30°C (70-90°F) at>74%RH for 48 hours (for re-hydration) If
permanent damage to the internal sensor is suspected, replace the Logger
immediately to insure accurate readings.
South Africa
www.major-tech.com sales@major-tech.com
Australia
www.majortech.com.au info@majortech.com.au