Major tech MT945 User manual

INSTRUCTION MANUAL
HOT WIRE THERMO ANEMOMETER
MT945

2

3
Contents Page no
1. Features ..........................................................................................4
2. Buttons ...........................................................................................4
3. Display Elements ..............................................................................5
4. Changing Setup Options ....................................................................6
4.1. Setup Options ..........................................................................6
4.2. Entering or Exiting Setup ...........................................................6
4.3. Changing a Setup Option ...........................................................6
4.4. Area Unit Setting ......................................................................6
4.5. Area Setting .............................................................................7
4.6. Auto Power Off Mode ................................................................7
4.7. Measuring Procedure ................................................................8
4.8. Direction of Sensor Head ...........................................................8
5. Performing a Multi-point Mean Calculation ...........................................9
6. Performing a Mean Calculation .........................................................10
7. Holding the Displayed Readings ........................................................10
8. Viewing the MIN, MAX Readings ........................................................10
9. Replacing the Batteries ....................................................................10
10. Specifications .................................................................................11
10.1. General Specifications .............................................................11
10.2. Electrical Specifications ..........................................................11
10.3. Temperature Specifications ......................................................11

4
The MT945 Hot Wire Thermo Anemometer is a microprocessor-based
device designed to simultaneously measure low air velocity and air
temperature. It utilizes a combination of a hot wire and a standard
thermistor to provide quick and accurate measurements. The slim
telescopic anemometer probe is well-suited for use in ducts and ventilation
systems. Monitoring air velocity and temperature readings together has
never been more convenient, thanks to the large backlit LCD display.
Additionally, the MT945 can record maximum and minimum readings,
allowing you to recall and hold data. Uploading and storing the measured
values into your computer is effortlessly accomplished through the built-in
USB interface.
Please read the following instructions carefully and always keep this
manual within easy reach.
1. FEATURES
• Thermal anemometer for very low air velocity measurement.
• Slim probe, ideal for grilles & diffusers.
• Combination of hot wire and standard thermistor, deliver rapid and
precise measurements even at low air velocity.
• Records Maximum and Minimum readings with recall.
• Microprocessor circuit assures maximum possible accuracy, provides
special functions and features.
• Large LCD with dual function meter's display, read the air velocity &
temp at the same time.
• Records Maximum and Minimum readings with recall.
• Air flow measurement: m/s, km/h, ft/min, MPH, Knots.
• Build in temperature °C, °F measurement.
• Thermistor sensor for Temp. measurement, fast response time.
• Used the durable, long-lasting components, including a strong, light
weight ABS-plastic housing case.
• Applications: Environmental testing, Air conveyors, Flow hoods, Clean
rooms, Air velocity, Air balancing, Fans/motors/blowers, Furnace velocity,
Refrigerated Case, Paint spray booths.
2. BUTTONS
• Press " " .The thermal sensor is heated up (5s). Measurement view
is opened: The current reading is displayed, or "----"lights up if no
reading is available. Press " " again, turn off the instrument.
• Press "Man/Mix" to freeze or unfreeze the displayed readings or air
velocity Zero Adjust.
• Press "Enter" to enter a Setup option. Press "Enter" again to store
the displayed setting in memory.

5
1 - Low Power.
2 - Primary Display: air
velocity, recording data or
time.
3 - Air velocity units.
4 - Secondly display data.
5 - Secondly display: air flow,
temperature, or air velocity
data.
6 - Record MAX, MIN display.
7 - Sign of multi-point mean
calculation.
8 - Mean calculation
9 - Sign of mean calculation in
time.
10 - The multiple of Secondly
display data.
11 - Flow units.
12 - Temperature units.
13 - Flow area units.
14 - The multiple of Primary
display data.
15 - The Sign of Auto Power Off.
16 - The sign of time.
17 - Freezing the data.
18 - Entering or Exiting Setup.
• Press "Setup " to turn on the backlight. Press it again to turn off the
backlight. Press "Setup " button for 3 seconds to start or exit Setup.
(See "Changing Setup Options.")
• Press "Unit " to scroll to the Setup option you want to change. Press
"Unit " to increase the displayed setting.
• Press "Unit " to start recording and press again to stop recording. If
enter a Setup option. Scroll to the Setup option you want to change.
Press "Unit " to decrease the Displayed setting.
• Performing a multi-point mean calculation or performing a mean
calculation in time.
• Press "Man/Mix" to step through the maximum and minimum
readings. To exit the MAN/MIX mode, press the "Man/Mix" button for
2 seconds to return to normal operation.
• To change between displaying the temperature, flow velocity, and
calculated Volumetric flow rate: Press "Flow/Temp".
3. DISPLAY ELEMENTS

6
5
4. CHANGING SETUP OPTIONS
Use Setup to change area unit, flow area, sleep mode settings. The
thermometer stores the settings in its memory.
4.1. Setup Options
4.2. Entering or Exiting Setup
When the thermometer is in Setup mode, the display shows SETUP.
Press "Setup " button for 3 seconds start or exit Setup.
4.3. Changing a Setup Option
• Press "Unit " or "Unit " to scroll to the setup option you want to
change.
• Press "Enter" to indicate that you want to change this setting.
• Press "Unit " or "Unit " until the setting you want to use appears
on the display.
• Press "Enter" to store the new setting in memory.
Notes: Setup is disabled in MIN MAX, Mean mode.
4.4. Area unit Setting
• When the thermometer is in Setup mode, press "Unit " or "Unit "
to scroll to the area unit setup option (refer Fig.2).
• Press "Enter" button., The string "AREA" and area unit shows in the
screen.
• Press "Unit " or "Unit " to scroll to unit that you want to
change((refer Fig.3).
• Press "Enter" to store the new area in memory.
Choose area unit Unit set area unit
Change the flow area area set area of measuring air flow
Auto Power Off mode SLP auto off or on
Option SettingsMain Menu

7
4.5. Area Setting
Changing the number digits of area and change the number value of area.
Press "Unit " or "Unit " to scroll to the area value setup option
when the thermometer is in the setup mode. Press "Enter" button, the
area number flashes. Press "Unit " or "Unit " to scroll to digit that
you want to change (refer Fig.3).
Press "Enter", the screen indicate that area number with a flashing digit.
Press "Unit " or "Unit " to change the flashing digit from 0 to 9. Press
"Mean" to change the station of flashing digit and press “Unit ” or
"Unit " to change the number, the adjust order is from
right to left. Press "Enter" to store the new area in memory.
4.6. Auto Power Off Mode
The thermometer enters sleep mode (default). That is to say, the meter
will automatically shut off after 20 minutes if no button press occurs for
20 minutes.
When the thermometer is in Setup mode, the display shows SETUP. Press
"Unit " or "Unit " to scroll to the "SLP" page. Press "Enter" to
indicate "On"
or "OFF". Press "Unit " or "Unit " until the setting you want to use
appears on the display. Press "Enter" to store the new setting in
memory. On (sleep mode on) or OFF (sleep mode off).

8
4.7. Measuring Procedure
1. Connect the "Probe's Plug" to the "Probe Input Socket".
2. Power on the meter by push the "Power On/Off Button".
3. Select the desire air velocity units and temperature units.
4. Zero setting:
a.On the "Sensing Head", slide the sensor cover to the up position to let
the air Velocity sensor isolated from the environment.
b.Push the "Zero Button" to let reading value of air velocity shows zero
value.
5. Slide the sensor cover to the down position which will allow the air
velocity sensor to come into contact with the air, refer Fig.2. Extend the
telescope probe to the marked length, refer Fig.4.

4.8. Direction of the sensor head:
There is a mark on the top of the "Sensor Head", when making the
measurement, this mark should be against the measured wind - refer to
Fig. 4 and Fig. 5. When the sensor head face is against the measurement
air, then sensor head face against the measured air, then the upper
display will show the air velocity value. The lower display will show the
temperature value.
5. PERFORMING A MULTI-POINT MEAN CALCULATION
• Press "Mean".
Mean is lit. The number of readings recorded is displayed in the upper
line, while the current reading is displayed in the lower line.
• To change between displaying the temperature, flow velocity and
calculated. Volumetric flow rate: Press "Flow/Temp".
• If we want to change the units of the current reading, press "Unit ".
• To include readings (in the desired quantity): Press "Enter" (several
times).
• To end measurement and calculate the mean value: Press "Mean".
Mean flashes. The calculated spot mean value is displayed.
• To return to measurement view: Press "Mean". 9

10
4. Battery Replacement
1. When the low battery symbol “ ” appears on the
LCD, the six 1.5V “AA” batteries must be replaced.
2. Turn the meter off and remove the test leads.
3. Unclip the tilt stand from the rear of the meter.
4. Remove the four head screws holding the battery
cover.
5. Remove the battery compartment cover.
6. Replace the batteries observing polarity.
7. Affix the rear cover and secure the screws.
8. Reattach the tilt stand.
6. PERFORMING A MEAN CALCULATION IN TIME
• Press "Mean" for 2 seconds. Mean is lit. The elapsed measuring time
(mm:ss) is displayed in the upper line while the current reading is displayed
in the lower line.
• To change between displaying the temperature, flow velocity and calculated
volumetric flow rate: Press "Flow/Temp".
• If you want to change the units of the current reading, press "Unit ".
• To interrupt/continue measurement: Press each time.
• To end measurement and calculate the mean value: Press "Mean".
Meane flashes. The calculated mean value in time is displayed.
• To return to measurement view: Press "Mean".
7. HOLDING THE DISPLAYED READINGS
• Press "Hold/Zero" to freeze the readings on the display. The display
shows HOLD.
• To change between displaying the temperature, flow velocity and calculated
volumetric flow rate: Press "Flow/Temp".
• Press "Hold/Zero" again to turn off the HOLD function.
8. VIEWING THE MIN, MAX READINGS
• Press "Min/Max" to step through the maximum (MAX), minimum (MIN),
or the average (AVG) readings. The elapsed time since entering MAX/ MIN
mode, or the time at which the minimum or maximum occurred appears on
the display.
• Press "Min/Max" button for 2 seconds to exit MAX/MIN mode.
9. REPLACING THE BATTERIES
• Turn off the thermometer if necessary.
• Loosen the screw and remove the battery door.
• Replace 9V batteries.
• Replace the battery door and tighten the screw.

11
10. SPECIFICATIONS
10.1. General Specifications
Display 46.7mmx60 mm larger LCD display
Dual function meter's display
Measurement m/s (meters per second)
km/h (kilometers per hour)
ft/min (feet per minute)
MPH (miles per hour)
knots (nautical miles per hour)
Temp. ---°C ' °F
Data hold
Memory Maximum and Minimum with recall
Sampling Approx.0.8 sec
Operating Temperature 0°C to 50°C (32°F to 122°F )
Operating Humidity Less than 80% RH
Power Supply 9V battery
Power Current Approx. DC 60~90mA
Weight 280g
Dimension 210mmx75mmx50mm
Accessories included Hot wire sensor & 9V battery
Function Range
10.2. Electrical Specifications
Air Velocity
Measurement Range Resolution Accuracy
m/s 0.1 ~25.0m/s 0.01m/s
km/h 0.3~90.0km/h 0.1 km/h ±(5%+ 1 d)
ft/min 20~4925/min 1ft/min reading
MPH 0.2~55.8 MPH 0.1 MPH
knots 0.2~48.Sknots 0.1 knots
Function Range
Notes: m/s-meters per second km/h-kilometers per hour, ft/min-feet per
minute MPH-miles per hour, knots-nautical miles per hour
Measuring Range 0°C to 50°C (32°F to 122°F )
Resolution 0.1 °/0.1°F
Accuracy ± 1°C/1.8°F
Function Range
10.3. Temperature Specifications

www.major-tech.com www.majortech.com.au
[email protected] [email protected]
MAJOR TECH (PTY) LTD
South Africa Australia