MarMonix MAN-745 User manual

ThermoAnemometer+InfraRedThermometer
Products Code: MAN-745
User Manual
WWW.MARMONIX.CO

Introduction
The CFM/CMM Thermo Anemometer with InfraRed Thermometer measures Air Velocity, Air Flow
(volume), Air Temperature (with probe) and Surface Temperature (with the InfraRed function). The
large, easy-to-read backlit LCD includes primary and secondary displays plus numerous status
indicators. The InfraRed feature includes a laser pointer for convenient targeting. In addition, the meter
can store 16 area setting dimension for easy recall. Proper use of this meter will provide years of
reliable service.
CAUTIONS
 Improper use of this meter can cause damage, shock, injuryordeath. Read and understandthisuser
manual beforeoperatingthe meter.
 Inspectthecondition of theprobe and the meter itselfforanydamagebeforeoperatingthe meter.
Repairorreplaceanydamagebefore use.
 Iftheequipmentisused in a mannernotspecifiedbythemanufacturer,
theprotectionprovidedbytheequipmentmay be impaired.
 Thisdeviceisnot a toy and mustnotreachchildren’shands. Itcontainshazardousobjects as well as
smallpartsthatthechildrencouldswallow. In case a childswallowsany of them, pleasecontact a
physicianimmediately
 Do notleavebatteries and packing material lyingaroundunattended; they can be
dangerousforchildrenifthey use them as toys
 In case thedeviceisgoing to be unusedforan extended period of time, removethebatteries to
preventthemfromdraining
 Expiredordamagedbatteries can cause cauterizationoncontactwiththe skin.Always, therefore, use
suitablehandgloves in such cases
 Seethatthebatteries are not short-circuited.Do notthrowbatteriesintothefire.
 Do notdirectlyviewordirectthe laser pointer at aneye. Lowpower visible lasers do
notnormallypresent a hazard, butmaypresentsomepotentialforhazardifvieweddirectlyfor extended
periods of time

Specifications
Air Velocity Range Resolution Accuracy
m/s (meters per sec) 0.40 - 30.00 m/s 0.01 m/s ± (3%rdg + 0.20
m/s)
km/h (kilometers/hour) 1.4 - 108.0 km/h 0.1 km/h ± (3%rdg + 0.8
km/hr)
ft/min (feet per
minute)
80 – 5900 ft/min 1 ft/min ± (3%rdg + 40
ft/m)
mph (miles per hour) 0.9 – 67.0 mph 0.1 mph ± (3%rdg + 0.4
MPH)
knots (nautical MPH) 0.8 to 58.0 knots 0.1 knots ± (3%rdg + 0.4
knots)
Air Flow Range Resolution Area
CMM (cubic
meters/min)
0-999999 m3/min .1 0 to 999.9m2
CFM (cubic ft/min) 0-999999 ft3/min .1 0 to 999.9ft2
Air Temperature Range Resolution Accuracy
14 - 140oF (-10 - 60oC) 0.1oF/C 4.0oF (2.0oC)
InfraRed
Temperature
Range Resolution Accuracy
-58 to -4oF (-50 to -
20oC)
1oF/C
±9.0oF (5.0oC)
-4 to 500oF (-20 to
260oC)
±2% reading or
±4oF (2oC)
whichever is
greater
Circuit Custom LSI microprocessor circuit
Display Dual function 0.5" (13 mm) 4-digit LCD
Sampling rate 1 reading per second approx.
Sensors Air velocity/flow sensor: Conventional angled
vane arms with low-friction ball bearing.
Temperature sensors: NTC-type precision
thermistor and InfraRed
IR Spectral response 6 to 14µm
IR Emissivity 0.95 fixed
IR distance ratio 8:1
IR sampling rate 2.5 readings per second approx.
Automatic Power off Auto shut off after 20 minutes to preserve
battery life
Operating Temperature 32°F to 122°F (0°C to 50°C)
Storage Temperature 14 to 140oF (-10 to 60oC)
Operating Humidity <80% RH
Storage Humidity <80% RH
Operating Altitude 2000 meters (7000ft) maximum
Battery One 9 volt (NEDA 1604) battery
Battery life 80 hours approx. (if Backlight and
Laser are used continuously the

battery life is reduced to 2 to 3 hours
approx.)
Battery current 8.3 mA DC approx.
Weight 1.6 lbs. (725g) including battery & probe
Dimensions Main instrument: 7.0 x 2.9 x1.2" (178 x 74 x
33mm)
Sensor Head: 2.75” (70mm) Diameter
Meter Description
1. Power ON/OFF button
2. Probe input jack
3. Laser pointer
4. IR Sensor
5. Rubber holster
6. LCD Display
7. IR thermometer measurement button
8. Airflow buttons (4)
9. Air Temperature function buttons (2)
10. Vane
11. Airflow Average button
12. Backlight button
Note: The battery compartment, tilt stand
and tripod mount are located on the
rear of the instrument
Keypad
• Press to turn the meter ON or OFF
• IR + Laser Pointer Press and hold to measure.
• MAX/MIN Record and store the highest and lowest airflow or velocity readings. ◄ (LEFT) also
serves as change decimal point button in AREA mode
• UNITS Press to select the mode of operation. In FLOW mode, the meter displays air volume. In
VELOCITY mode, the meter displays air speed. ▲ (UP) also serves as
increase number button in AREA mode.
• HOLD Press to freeze the displayed reading. Press again to unlock display.
►(RIGHT) also serves as change digit button in AREA mode.
• AREA Press and hold to manually enter the area of a duct in CFM or CMM mode.
Press and hold to scroll thru memory locations.
This button also clears memory in the Averaging mode.
• Press to turn the backlight on/off. Hold to disable Auto Power Off.

• MAX/MIN (Temperature) Press to record and store the highest, lowest readings for air
temperature.
• HOLD (Temperature) Press to freeze the displayed temperature reading. Press again to
unlock the display.
• AVG Press and hold to enter averaging mode. Averages up to 20 readings.

Display Layout
MAX (top of LCD): Max Hold function engaged for the Air Temperature function
HOLD (top of LCD): Data Hold function engaged for the Air Temperature function
PROBE TEMP: Reminder that the top LCD digits represent Air (Vane) Temperature
: Indicates that the laser pointer is on.
 IR TEMP: Indicates that the larger LCD digits represent IR temperature measurement
 VEL: indicates that meter is in air velocity mode
 FLOW: indicates that meter is in air flow mode
MAX (bottom of LCD): Max Hold for the IR Temperature and RH function
HOLD (bottom of LCD): Data Hold for the IR Temperature function and RH function
oC / oF: Temperature units of measure
CFM/CMM: airflow units of measure
Ft2, m2: units for area dimensions
m/s, ft/min, km/h, MPH, knots: air velocity units of measure
X10, X100: multipliers for air flow readings
AVG: air averaging mode
RECORD: indicates that min/max function is running (top for temp, bottom for air)
Large LCD digits at center of display for Relative Humidity and IR Temperature
Smaller LCD digits at top, right of display for Probe Temperature
: Low battery indicator

Operation
Connecting the Vane
1. The vane plug is inserted in the meter’s sensor jack at the top of the meter. The plug and jack are
keyed so that the plug can only fit in the jack one way.
2. Turn the plug carefully until it lines up with the jack and then firmly push the plug in place. Do not
apply undue force or try to twist the plug side-to-side.
3. If the vane is not connected to the meter or if the sensor is defective, the LCD display will indicate
dashed lines in place of an air velocity reading.
Air Velocity Measurements
1. Turn on the meter using the ON/OFF button.
2. Press UNITS button to select the desired unit of measure.
NOTE: At power up the meter will display the last unit of
measure previously entered.
3. Place the sensor in the air stream. Ensure that the air enters
the vane as indicated by the arrow sticker placed inside the
vane. Refer to the diagram.
4. View the air velocity and temperature readings on the LCD
Display. The large main LCD display shows the Air Velocity
reading. The upper right LCD sub-display shows the
temperature reading.
Air Velocity Measurements (Up to 20 Point averaging)
1. To enter 20 Point Averaging Mode, press and hold the AVG
button until it beeps twice. The AVG icon will be displayed.
2. Take a measurement and press the AVG button. A single beep will sound and the HOLD icon will
appear in the display.
3. The average reading will be displayed and number of readings measured will appear in the upper
right hand corner of the display. After 5 seconds, the display will return to the current reading.
(IMPORTANT: Please note that the average readings are only held for 5 seconds and cannot be
recalled.)
4. Repeat steps 2 - 3 until all desired points have been measured.
5. Press the AREA button to clear the multipoint averaging memory.
6. To return to standard velocity measuring mode press and hold AVG button until meter beeps twice.
Note: In AVG mode, press and hold the AVG button until the meter beeps twice to return to normal
operation.
airflow
Arrow
Side view of Vane

Air Flow Measurements (CMM / CFM)
1. Turn on the meter using the ON/OFF button
2. Press the UNITS button to select the desired air flow units: CMM
(cubic meters per minute) or CFM (cubic feet per minute). NOTE: At
power up the meter will display the last unit of measure previously
entered.
3. To begin entering the area in m2 or ft2, press and hold the AREA
button until it beeps twice. The leftmost digit of the bottom display will
begin to flash.
4. Use the ▲ (UP) button to change the flashing digit
Use the ◄ (LEFT) button to move the decimal
Use ► (RIGHT) button to select the other digits.
After all of the digits are entered, press and hold the AREA button
(until meter beeps twice) to save the area into memory and return to
CFM or CMM measuring mode.
5. Place the sensor in the air stream. Ensure that the air enters the vane
as indicated by the arrow sticker placed inside the vane. Refer to the
diagram.
The meter has 16 memory locations (8 for CFM and 8 for CMM) that
can be used to storel commonly used area sizes that you can recall at anytime.
1. Press the AREA button until meter beeps twice. A memory location number will appear in the top right
of the display indicating the memory location.
2. Push the AREA button to scroll thru and select the desired location. Once you have selected the
desired memory location enter your dimension
Use the ▲ (UP) button to change the flashing digit
Use the ◄ (LEFT) button to move the decimal
Use ► (RIGHT) button to select the other digits. After all of the digits are entered, press and hold the
AREA button (until it beeps twice) to save the area into memory and return to CFM or CMM measuring
mode.
To select and use a previously stored dimension, press and hold the AREA button until it beeps twice.
Press AREA to scroll thru the 8 memory locations. Press and hold the AREA button until it beeps twice.
to return to CFM or CMM measuring mode.
Air Flow Measurements (Up to 20 Point averaging)
1. To enter 20 Point Averaging Mode, press and hold the AVG button until it beeps twice. The AVG icon
will be displayed.
2. Take a measurement and press the AVG button. A single beep will sound and the HOLD icon will
appear in the display.
3. The average reading will be displayed and number of readings measured will appear in the upper right
hand corner of the display. After 5 seconds, the display will return to the current reading. (IMPORTANT:
Please note that the average readings are only held for 5 seconds and cannot be recalled.)
4. Repeat steps 2 - 3 until all desired points have been measured.
5. Press the AREA button to clear the multipoint averaging memory.
6. To return to standard airflow measuring mode press and hold AVG button until meter beeps twice.
airflow
Arrow
Side view of Vane

7. Data Hold (Air Velocity/Air Flow)
1. While taking measurements, press the HOLD button to freeze the air velocity/air flow reading for later
viewing.
2. The HOLD indicator will appear in the bottom of the LCD display.
3. Press HOLD again to return to normal operation.
MAX/MIN/AVG Record (Air Velocity/Air Flow)
This allows the user to record and view the highest (MAX), lowest (MIN) and average (AVG) readings.
1. Press the button MAX/MIN button. The AVG indicator and RECORD indicator along with the average
reading will appear on the LCD display and the meter will begin keeping track of the MAX, MIN and
Average values.
2. Press the MAX/MIN button again. The MAX indicator will appear on the display and display the Max
reading.
3. Press the MAX/MIN button again to view the minimum reading. The MIN indicator along with the
minimum reading will appear on the LCD display and display the Min reading.
4. Press the MAX/MIN button again to display current readings. NOTE: the meter will keep recording
MAX/MIN/AVG readings.
5. To clear and stop MAX/MIN/AVG recording and return to normal operation, press the AREA button
once when displaying the current reading.

Temperature Units
1. Remove the meter’s rubber protective jacket and select the desired temperature units using the °F/°C
slide switch located in the battery compartment.
2. Replace the protective jacket and connect the sensor to the sensor input jack on top of the meter.
Data Hold (Air Temperature)
1. While taking measurements, press the PROBE TEMPERATURE HOLD button to freeze the air
temperature reading.
2. The HOLD indicator will appear in the bottom of the LCD display.
3. Press PROBE TEMPERATURE HOLD again to return to normal operation.
Max/Min Record (Air Temperature)
This allows the user to record and view the highest (MAX), lowest (MIN) air temperature readings.
1. Press the TEMPERATURE MAX/MIN button once. The MAX indicator will appear on the display and the
meter will begin keeping track of the MAX/MIN air temperature values.
2. Press the button again to view the minimum reading. The MIN indicator along with the minimum air
temperature reading will appear on the LCD display.
3. Press the button again to return to normal operation.
Automatic Power OFF
To conserve battery life, the meter automatically turns off after 20 minutes. To override this feature:
Turn the meter OFF.
Press and hold the (Backlight) key while turning the meter ON.
3. “disAPO” will appear in the display. The AUTO POWER OFF feature will now be disabled.
Note that AUTO POWER OFF is re-enabled each time the meter is turned on.
Also note that AUTO POWER OFF is disabled in CFM/CMM or Average mode.

InfraRed (Non-Contact) Temperature Measurements
1. The IR sensor is located at the top of the meter.
2. Point the sensor toward the surface to be measured.
3. Press and hold the red IR button to begin measuring the surface temperature of
a desired target. IR TEMP and will appear on the display. The laser pointer
will switch on to help aim the meter.
4. The measured IR surface temperature will appear at the center of the LCD
(larger digits). The temperature displayed is the temperature of the area within
the spot.
5. When the red IR button is released, the laser pointer will switch off and the
reading will freeze (data hold) on the display for approximately 3 seconds.
6. Note that the vane (Air Temperature) continues to monitor temperature during IR
tests and its temperature is displayed on the top of the LCD (smaller digits).
7. After approximately 3 seconds the meter defaults to the Air Flow and Air
Temperature display.
WARNING: Do not directly view or direct the laser pointer at an eye. Low power visible lasers do
not normally present a hazard, but may present some potential for hazard if viewed directly for extended
periods of time.

Battery Replacement
When appears on the LCD, the 9V battery must be replaced.
1. Disconnect the vane.
2. Remove the meter’s rubber protective jacket
3. Use a flat blade screwdriver or a coin to open the rear battery compartment
4. Replace the 9V battery
5. Close the battery compartment and replace the meter’s protective jacket
You, as theenduser, are legallybound (Batteryordinance) to
returnallusedbatteries and accumulators; disposal in
thehouseholdgarbageisprohibited!
You can handoveryourusedbatteries / accumulators, gratuitously,
at thecollectionpointsforourbranches in
yourcommunityorwhereverbatteries / accumulators are sold!
Disposal
Followthevalid legal stipulations in respect of thedisposal of thedevice at
theend of itslifecycle

InfraRed Measurement Considerations
 When taking IR measurements the meter automatically compensates for ambient
temperature changes. Note that it may take up to 30 minutes to adjust to
extremely wide ambient changes.
 Low temperature measurements quickly followed by high temperature
measurements may require several minutes to stabilize as a result of the IR sensor
cooling process.
 If the surface of the object under test is covered with frost, oil, grime, etc., clean
before taking measurements.
 If an object's surface is highly reflective apply masking tape or flat black paint
before measuring.
 Steam, dust, smoke, etc. can obstruct measurements.
 To find a hot spot, aim the meter outside the area of interest then scan across (in
an up and down motion) until the hot spot is located.
IR Theory
IR thermometers measure the surface temperature of an object. The meter’s
optics sense emitted, reflected, & transmitted energy that is collected and
focused onto the meter’s detector. The meter’s circuitry translates this
information into an LCD reading.
IR Field of View
Ensure that the desired target is larger than the spot size as shown in the diagram
below. As the distance from an object increases, the spot size of the area
measured by the meter becomes larger. The meter’s field of view ratio is 8:1,
meaning that if the meter is 8 inches from the target, the diameter (spot) of the
object under test must be at least 1 inch. Other distances are shown below in the
field of view diagram.

Emissivity
Most organic materials and painted or oxidized surfaces have an emissivity of
0.95. Inaccurate readings will result when measuring shiny or polished surfaces.
To compensate, cover the surface under test with masking tape or flat black paint.
Allow time for the tape to reach the same temperature as the material
underneath then measure the temperature of the tape or the painted surface.

Thermal Emissivity Table for Common Materials
Material Emissivity
Asphalt 0.90 to 0.98
Concrete 0.94
Cement 0.96
Sand 0.90
Earth 0.92 to 0.96
Water 0.67
Ice 0.96 to 0.98
Snow 0.83
Glass 0.85 to 1.00
Ceramic 0.90 to 0.94
Marble 0.94
Plaster 0.80 to 0.90
Mortar 0.89 to 0.91
Brick 0.93 to 0.96
Cloth (black) 0.98
Human skin 0.98
Leather 0.75 to 0.80
Charcoal
(powder)
0.96
Lacquer 0.80 to 0.95
Lacquer (matt) 0.97
Rubber
(black)
0.94
Plastic 0.85 to 0.95
Timber 0.90
Paper 0.70 to 0.94
Chromium
oxides
0.81
Copper
Oxides
0.78
Iron Oxides 0.78 to 0.82
Textiles 0.90

Useful Equations and Conversions
Area equation for rectangular or square ducts
Area
equation for circular ducts
Cubic equations
NOTE: Measurements made in inches
must be converted to feet or meters before using the above formulae.
Unit of Measure Conversion Table
m/s ft/min knots km/h MPH
1 m/s 1 196.87 1.944 3.6 2.24
1 ft/min 0.00508 1 0.00987 0.01829 0.01138
1 knot 0.5144 101.27 1 1.8519 1.1523
1 km/h 0.2778 54.69 0.54 1 0.6222
1 MPH 0.4464 87.89 0.8679 1.6071 1
Width (W)
Height
(H)
Area (A) = Width (W) x Height (H)
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
Radius
Area (A) =

x r2
Where = 3.14 and r2 =
radius x radius