Major tech MT941 Manuel utilisateur
INSTRUCTION MANUAL
5-IN-1MULTIFUNCTION
ENVIRONMENTAL METER
MT941
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Contents Page no
1. Introduction................................................................................4
2. Features...........................................................................................4
3. Button Identification..........................................................................4
4. Display Elements...............................................................................5
5. Changing Setup Options.....................................................................6
5.1. Setup Options...........................................................................6
5.2. Entering or Exiting Setup............................................................6
5.3. Changing a Setup Option............................................................6
5.4. Temperature Unit......................................................................6
5.5. Light Unit.................................................................................7
5.6. Sound Unit...............................................................................7
5.7. Offset...................................................................................... 7
5.8. Velocity Unit.............................................................................7
5.9. Flow Unit..................................................................................8
5.10. Area Unit..................................................................................8
5.11. Area Size..................................................................................8
5.12. Auto Power Off Mode.................................................................9
5.13. Measuring RH% & Temperature..................................................9
5.14. Measuring TYPE-K Temperature..................................................9
5.15. Measuring Sound......................................................................9
5.16. Measuring Light........................................................................9
5.17. Measuring Air Velocity & Air Flow...............................................10
5.18. Holding the Displayed Readings................................................10
5.19. Viewing the MIN, MAX, and AVG Readings..................................10
6. Replacing the Batteries.....................................................................11
7. Specifications..................................................................................11
7.1. General Specifications..............................................................11
7.2. Manometer Specifications........................................................11
1. INTRODUCTION
• The 5-in-1 digital Multifunction Environment Meter has been designed to
combine the functions of Sound Level Meter, Light Meter, Humidity Meter
and Temperature Meter and CFM/CMM Thermo-Anemometer. It is an
ideal Multifunction Environment Meter Instrument with scores of
practical applications for professional and home use.
• The Sound level function can be used to measure noise in factories,
schools, offices, home, etc, checking acoustics of studios, auditoriums
and hi-fi installations.
• The Light function is used to measure luminance in the field. It is fully
cosine corrected for the angular incidence of light. The light sensitive
component used in the meter is a very stable, long, life silicon diode.
• The Humidity/Temperature uses a humidity/semiconductor sensor and K
type thermocouple.
• CFM/CMM Thermo-Anemometer is suitable for use in a wide variety of
applications, including plant maintenance operations, environmental
analysis, fume hood testing, and HVAC system assessments.
2. FEATURES
1. Larger LCD display with backlight. MAX MIN and AVG measurements.
2. Display Sound, Light, Type-K Temperature, Humidity & Temperature plus
Air Velocity & Air Flow simultaneously.
3. Electronic Offset function allows compensation of thermocouple errors to
maximize overall accuracy.
4. The device measures air velocity, it features 5 selectable units of velocity
measure: mis, ft/min, km/h, MPH, knots. And it features 2 selectable
units of flow measure: CFM, CMM.
5. Easy to set Area dimension (up to 6 point) for air flow measurement.
6. USB interface, USB to UART Bridge Controller.
7. Low battery indication, and Auto Power Off mode (Sleep mode)
increases.
3. BUTTON IDENTIFICATION
1. Press to turn the meter on or off.
2. Press to step through the maximum, minimum, and average
readings. To exit the MIN/MAX/AVG mode, press button for 2
seconds to return to normal operation.
3. Press to toggle showing the Temperature (Humidity Probe), and K
Type Temperature in the primary.
4. Press to freeze or unfreeze the displayed readings. The meter is in
area setup option, press to change the station of flashing digit.
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4. DISPLAY ELEMENTS
1. - Temperature (Humidity
Probe), K Type Temperature
and Air Velocity Modes are
Active in Primary Display
2. - Area Indication
3. - Light, Sound, Air Flow and
Humidity Modes Are Active In
Secondary Display
4. - The Secondary Display
5. - Sound of Fast or Slow Mode
6. - Data Hold Indicator
7. - REC, MAX, MIN and AVG
Indicators.
8. - Units of Sound (dBA / dBC) in
Secondary Display
9. - Units of Light (LUX/ FC) in
Secondary Display
10. - Type K Temperature Offset
Option, OFFSET Display.
11. - Entering or Exiting Setup
Mode
12. - Multiplier (x10 or x100)
13. - Units of Flow (CFM/CMM) in
Secondary Display
5. Press to toggle showing the Light, Sound, Air Flow and Humidity in
the secondary display.
6. Press button to turn on the backlight. Press it again to turn off the
backlight. Press button for 2 seconds to start or exit Setup. (See
"Changing Setup Options.")
7. When secondary readings shows the Sound, press to switch between
FAST and SLOW mode. When secondary readings shows the Light,
press for 2 seconds to zero the Light. When the meter is in Setup
mode, press to enter a setup option and press again to store the
displayed setting in memory.
8. Press to change the units of primary display. In Setup mode, press
to scroll to the Setup option you want to change or press to increase
the displayed setting.
9. Press to change the units of secondary display. In Setup mode, press
to scroll to the Setup option you want to change or press to decrease
the displayed setting.
14. - Units of Humidity in Secondary
Display
15. - The Indication of Meter
Communicating To PC
16. - Units of Area
17. - Units of velocity
18. - Multiplier(x10)
19. - Units of Temperature
20. - Low Battery Indicator
21. - Auto Power off Mode Indicators
22. - The Primary Display
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5. CHANGING SETUP OPTIONS
Use Setup to choose Temperature, Light, Sound, Air Velocity, Air Flow,
Area, TYPE-K offset and sleep mode setting. The meter stores the settings
in its memory.
5.1. Setup Options
5.2. Entering or Exiting Setup
When the meter is in Setup mode, the display shows SETUP. Press
button for 2 seconds start or exit Setup.
5.3. Changing a Setup Option
1. Press or to scroll to the setup option you want to change.
2. Press to indicate that you want to change this setting.
3. Press or until the setting you want to use appears on the
display. Press to store the new setting in memory.
Note: Setup is disabled in MIN MAX/AVG mode.
5.4. Temperature Unit
When one want to change the
temperature unit. Enter TEMP Unit setup
operation, Press or until the display
show ˚C or ˚F. Press , and then store
the new setting in memory.
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Temperature Unit TEMP Unit Set Temperature Unit (°C or °F)
Light Unit LIGHT Unit Set Light Unit (LUX or FC)
Sound Unit SOUND Unit Set Sound Unit (dBA or dBC)
Offset TYPE-K OFFSET TYPE-K Temperature offset
Units of velocity VEL Unit Set Velocity Unit (five unit)
Units of Flow FLOW Unit Set Flow Unit (CFM or CMM)
Units of Area AREA Unit Set Area Of Unit /in² or cm² or ft²)
Size of Area AREA Size Set Area Of Measuring Air Flow
Sleep Mode SLP Yes or No
Option SettingsMenu Item
5.5. Light Unit
When one wants to change the Light unit, enter
LIGHT Unit setup operation, Press or until the
display shows LUX or FC, Press , and then
store the new setting in memory.
5.6. Sound Unit
When one wants to change the sound unit,
enter Sound Unit setup operation. Press or
until the display shows dBA or dBC. Press to
store the new setting in memory.
5.7. 0ffset
The secondary display shows the temperature
plus the offset and the primary display shows
the offset. You can store individual offsets for
TYPE K temperature. Press or to increase or
decrease offsets. Press to store the new
setting in memory.
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5.8. Velocity Unit
When one wants to change the velocity unit.
Enter velocity Unit setup operation, Press or
until the display shows the unit you want to
change. Press to store the new setting in
memory.
Notes: m/s - meters per second
ft/min - feet per minute
knots - nautical miles per hour
km/h - kilometers per hour
MPH - miles per hour
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5.9. Flow Unit
When one wants to change the flow unit. Enter
Flow Unit setup operation, Press or until the
display show CFM or CMM. Press store the
new setting in memory.
Notes:
CFM (ft³/min) = Air Velocity (ft/min) x Area (ft²)
CMM (m³/min) = Air Velocity (m/s) x Area (m²)
x60
CFM: cubic feet per minute
CMM: cubic meters per minute
5.10. Area Unit
When one wants to change the area unit,
enter area Unit setup operation. Press or
until the display show the unit you want to
change. Press to store the new setting in
memory.
5.11. Area Size
1. When the meter is in Setup mode, press
or to scroll to the area size setup option.
2. Press button. The secondary display
shows the area number and area unit. The
primary display shows the area being used.
Such as "S-3", that is "the three numbers of
area size setting". The numbers change
circularly from 1 to 6.
3. Press or to scroll to chose the area that
you want to change.
4. Press to indicate that area number with a
flashing digit.
5. Press or to change the flashing digit
from 0 to 9.
6. Press to change the station of flashing
digit and press or to change the number.
The adjust order is from right to left
7. Press to store the new area in memory.
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5.12. Auto Power Off Mode
The meter enters sleep mode (default). That is to
say, the meter will automatically shut off after 20
minutes if no button is pressed for 20 minutes. When
the meter is in Setup mode, the display shows
SETUP. Press or to scroll to the" SLP" page.
Press to indicate "On" or "OFF". Press or until
the setting you want to use appears on the display.
Press to store the new setting in memory. On
(sleep mode on)or OFF (sleep mode off).
5.13. Measuring RH% & Temperature
1. Connect the "RH% & Temperatures of Probe to the "Probe Input
Socket".
2. Press to toggle showing the Temperature in the primary display.
3. Press to toggle showing the humidity in the secondary display.
4. Press will change the temperature units between °C and °F.
5.14. Measuring TYPE K Temperature
1. Hold or attach the thermocouple(s) to the measurement location.
2. Press to toggle showing the TYPE K Temperature in the primary
display.
3. Press will change the temperature units between °C and °F.
Notes:
The display shows "- - - -" when a thermocouple is not connected.
The display shows OL or -OL (overload) when the temperature being
measured is outside the thermocouple's valid range.
5.15. Measuring Sound
1. Press to toggle showing the Sound in the secondary display.
2. Press will switch between FAST and SLOW mode.
3. Press will change the sound units between dBA and dBC.
5.16. Measuring Light
1. Connect the Light Probe to the "Probe Input Socket".
2. Press to toggle showing the Light in the secondary.
3. lf Light of Probe is closed, secondary readings of the Light number
is not "0.000", press the button for more than 2 seconds to zero
the Light .The meter will reset and display "0000" from right to
left. 0.000 will be display.
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5.17. Measuring Air Velocity & Air Flow
1. Connect the sensor to the sensor input
jack right of the meter.
2. Press to toggle showing the Velocity in
the primary display.
3. Place the sensor in the air current. The
orientation, which arrowhead falls on, is
identical as air current (see pic 1)
4. Press to select the desired air velocity
units.
5. View the air velocity readings on the
primary display.
6. Press to toggle showing the area in
secondary display.
7. Press again to toggle showing the
flow in the secondary display.
8. lf you want to change the area number
after step 6, press button for 2 seconds
to start area setting option. Press or to
scroll to chose the area that you want to
change. Then press to indicate that area
number with a flashing digit. Press or
to change the flashing digit from 0 to 9.
Press to change the station of flashing
digit. Press or to change the flashing
digit. The adjust order is from right to left.
Lastly, press to show the air flow
number.
D
5.18. Holding the Displayed Readings
1. Press to freeze the readings on the display. The display shows
HOLD.
2. Press again to turn off the HOLD function.
5.19. Viewing the MIN, MAX, and AVG Readings
1. Press to step through the maximum (MAX), minimum (MIN), or
the average (AVG) readings.
2. Press to show the maximum, minimum, and average of air
velocity, Temperature (humidity probe), and TYPE-K Temperature.
3. Press to show the maximum, minimum, and average of light,
sound, air flow and humidity value.
4. Press button for 2 seconds to exit MAX/MIN/AVG mode.
Notes: HOLD, MIN/MAX/AVG and Setup can be used when measuring
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