MAJOR TECH MT667 Thermo Hygrometer Instruction Manual
- June 9, 2024
- MAJOR TECH
Table of Contents
MAJOR TECH MT667 Thermo Hygrometer
INTRODUCTION
The MT667 is a digital microprocessor controlled Thermo-Hygrometer with fast
response and high accuracy with Dew point, Wet bulb and Temperature
measurements. The Wet Bulb mode is effectively a Digital Sling Psychrometer.
It is an ideal instrument for scores of practical applications for Laboratory,
Industrial, Engineer and Professional use. This offers a wide variety of
applications ranging from HVAC to laboratories, and is ideal in other
industries such as computer rooms, hospitals, tobacco industry, factories and
offices and general use.
The Humidity & Temperature Meter uses a humidity & temperature semiconductor
sensor. This operation manual contains general information and specification.
FEATURES
- Fast Response Time %RH: 10s (90% at 25°C still air)
- High Accuracy
- Dew Point Temperature (-30°C to 100°C)/(-22°F to 199°F)
- Wet Bulb Temperature (0°C to 80°C)/(32°F to 176°F)
- Resolution 0.01%RH, 0.01°C/0.01°F
- Max Hold and Data Hold Function
- Micro Processor-based Design
- Dual Display Temperature & Humidity
- Auto Power Off, Disable Sleep Mode
- Back light
- Mini Size
SPECIFICATIONS
| Function | Range |
|---|---|
| Display | Large 4½ dual digital LCD display with back light |
| Sensor Type | A single chip relative humidity and temperature |
multi sensor module comprising a calibrated digital output.
Response Time| %RH:105 (90% at +25°C still air)
Accuracy Note| Accuracy is specified for the following ambient
temperature range: 18 to 28°C (64 to 82°F)
Sampling Rate| 2.5 samples per second
Polarity| Automatic, (-) negative polarity indication.
Over-range:| “OL” mark indication.
Low Battery
Indication
| The ” ” is displayed when the battery voltage
drops below the operating level.
Operating Conditions| 0 to 40°C (32 to 104°F); < 80% RH non-
condensing
Storage Conditions| -10 to 60°C (14 to 140°F); <80% RH non- condensing
Auto Power Off| Meter automatically shuts down after approx.15 minutes of
inactivity (Sleep Mode) To override Auto Power Off function (Non-Sleep Mode):
First press hold/backlight button, then press the power button. After the full
display appears, release both buttons. lcon ” ” will not show on the LCD. The
unit will not auto power off now.
Power| One standard 9V, NEDA1604 or 6F22 battery.
Dimensions/Wt.| 225 (H) x 45 (W) x 34 (D) mm/200g
Humidity / Temperature Measurement Range
| Function | Range |
|---|---|
| Humidity | 0%~100%RH |
| Temperature | -30°C ~ 100°C, -30°F ~ 199°F |
| Resolution | 0.01% RH, 0.01°C/°F. |
| Humidity Accuracy | ±2%RH (at 25°C, 20%～80% RH). |
±2.5%RH (at other ranges)
Air Temperature Accuracy| ±0.5°C+ 0.9°F (at 25°C)
±0.8°C/+ 1.5°F (all other ranges)
Note: The measuring range is from 0% to 100%, but above 80% and below 20% the deviation is not specified.
PANEL DESCRIPTION
-
Humidity / Air Temperature
Probe: Humidity & and Temperature Semiconductor Sensor inside. -
LCD Display: 4½ dual digits
LCD display with units of °C, °F, %RH dew point, wet bulb and low battery “BAT” MIN /MAX HOLD, indication. -
MAX/ MIN Button: Press
MAX/MIN button to enter MAX, MIN Recording mode (manual range only). Select the proper range before selecting MAX MIN to ensure that the MAX/MIN reading will not exceed the testing range. Press once to select MIN. Press again to select MAX. Press and hold the Button for over 2 second to turn off MAX, MIN Recording. -
°C, °F, Dew Point, Wbt
Select Button: Press °C, °F, Dew Point, Wbt select Button to enter select °C, °F, Dew Point, Wet Bulb Measurement. -
Power ON/OFF Button: Turn
the meter power ON/OFF. -
HOLD /Back light Button:
Press Hold/backlight Button to enter hold function. The reading will be held when Data Hold button is pressed. Press Hold/backlight Button for over 2 seconds to turn on or off back light function. -
Battery Compartment
HUMIDITY AND AIR TEMPERATURE MEASUREMENTS
- Hold the probe in the area to be tested & allow adequate time for readings to stabilize.
- Press °C, °F, dew point, WBT select Button to enter select °C, °F, dew point Wet Bulb Measurement.
- Read the Relative Humidity and Air Temperature, dew point temperature wet bulb temperature.
NOTE: Do not immerse the probe in liquid; it is intended for use in air
only.
WARNING: Don’t expose the sensor to direct sunlight (in solation). Don’t
touch or manipulate the sensor.
BATTERY REPLACEMENT
If the sign ” ” appears on the LCD display, it indicates that the battery should be replaced. Open the battery case and replace the depleted battery with a new battery. (1 x 9V battery NEDA 1604, 6F22 or equivalent).
MAJOR TECH (PTY) LTD
South Africa
www.major-tech.com
sales@major-tech.com
Australia
www.majortech.com.au
info@majortech.com.au
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>