Major tech MT91 User manual

MT91
MINI HYGROMETER
INSTRUCTION MANUAL

2. Features
1. Range: 0.0 ~ 100.0%RH, -20.0°C ~ 60.0°C (-4.0°F ~ 140.0°F);
2. Range Resolution: 0.1%RH, 0.1°C/0.1°F
3. Dual Display Temperature & Humidity.
4. Bluetooth 4.0
5. MAX/MIN
6. HOLD lock and backlight
7. Measurable Dry bulb temperature, Wet bulb temperature, Dew point Temperature
8. Temperature unit switch
9. Auto power off, Disable auto-power off.
1. Meter Description
1- Temperature/Humidity Sensor
2- LCD Display
3- Data Hold/Backlight button
4- MAX/MIN button
5- Power on/off button
6- Temperature button
7- Bluetooth button
3. Specifications
Function Range Resolution Accuracy
Humidity 0 - 100%RH 0.1%RH ±3.5%RH (20 - 80%)
±5%RH (0 - 20&80 - 100%)
Dry bulb temperature -20 - 60°C 0.1 °C/°F ±0.5°C/0.9°F (0 - 40°C)
-4 - 140°F ±1°C/1 .8°F (-20 - 0&40 - 60 °C)
Wet bulb temperature 0 - 60°C 0.1 °C/°F ±0.5°C/0.9°F (0 - 40 °C)
32 -140°F ±1°C/1 .8°F (40 - 60 °C)
-
Dew point temperature -20.0 - 60°C 0.1 °C/°F ±0.5°C/0.9°F (0 40 °C)
-4 - 140°F ±1°C/1.8°F (-20 - 0&40 - 60°C)
Display
Sensor Type
Low battery indication
Dual digital LCD display with backlight
Humidity: Accurate capacitance sensor
Temperature: Thermistor
The low battery signal “ ” flash when battery voltage
drops below 7 .2V; The backlight and low battery signal
“” flash twice when battery voltage drops below 6.5V, then
auto power off.

Operating condition
Storage condition
Power
Dimension
Weight.
0 50°C(32 122°F) < 80%RH non-condensing
~ ~
-20 60°C(-4 140°F) <80%RH non-condensing
~ ~
1 x 9V battery.
204 (L) X 54 (W) X 36 (H) mm
172g
4. Operation instructions
Power on:
Press button to power on, system default auto power off. Hold down the button to power on
and disable auto power off function. Hold Down the button again to enable the auto power off
function
Power off:
Press button to power off.
Auto-power off:
If the meter is not active for 10 minutes, it will Auto-power off. The auto-power off sign " "
displays in the left corner of the LCD. If the button is held down for over 1 minute, it will be
recognised as a faulty operation and the instrument will auto power off.
Temperature:
Press to switch the measure temperature type: NULL (dry bulb temperature) WB (wet bulb
temperature) DP (Dew point temperature) NULL (dry bulb temperature), cycle in this
order. Default measure dry bulb temperature; hold down the temperature button to switch
temperature unit, and cycle in turn °C °F °C , default unit is the last unit before power
off.
Free software for Bluetooth application:
Download Meterbox Pro on iOS and Android devices and select Environmental Meter
Bluetooth:
Hold down to enable/disable the Bluetooth communication function
MAX/MIN:
Press MAX/MIN button and "MAX" appears on the display. The LCD is now displaying the
maximum reading of the selected parameter. The display reading will not change until a higher
reading is registered. Press the MIN/MAX button and "MIN" appears on the display. The LCD is
now displaying the minimum reading of the selected parameter. The display reading will not
change until a lower reading is registered. Press the MIN/MAX button to exit the mode.
Cycle in order: NULL MAX MIN NULL.
HOLD/Backlight:
Press Hold/backlight Button to enter hold function, the LCD displays "HOLD". On hold mode,
only the power button and Hold/backlight button is enabled. Press the button again to disable
the hold function (Hold is no longer on LCD). Hold down the button to enable/disable the
backlight. (Note: button 2, 3, 4, 5 can be enabled only when the instrument is powered on.)
Maintenance:
The instrument should be cleaned with a damp cloth and non-corrosive cleanser when
necessary. The instrument must be kept at a proper temperature and humidity environment. If
the instrument will not be used for an extended period of time, please remove the battery.
Battery Replacement:
If the low battery signal appears on the LCD display, it indicates that the battery should be
replaced. Open the battery cover with screwdriver, then replace the used battery with a new
battery.

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South Africa Australia