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
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Australia
www.majortech.com.au
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