Tenma 72-820 User manual

TENMA 72-820 OPERATING MANUAL
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This Manual: http://www.manuallib.com/file/2592895

Infrared
Thermometer
72-820
This Manual: http://www.manuallib.com/file/2592895

Model 72-820
OPERATING MANUAL
This Manual: http://www.manuallib.com/file/2592895

Title Page
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Table of Contents
Model 72-820: OPERATING MANUAL
Introduction
Safety Information
Features
Display
Buttons and Connector
How the Thermometer works.
Operating the Thermometer
Locating a Hot or Cold Spot
Distance and Spot Size
Field of View
Emissivity
Trigger Lock
Switching oC/ oF
HOLD
Typical Measurements
Testing Contactors (Starters)
Testing Enclosed Relays
Testing Fuses and Buss Connections
Testing Electrical Connections
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Table of Contents
Title Page
Model 72-820: OPERATING MANUAL
Scanning Walls for Air Leaks or Insulation Deficiencies
Testing Bearings
Testing Belts and Sheaves
Checking Hydronic Radiant Heat Applications
Measuring Grille, Register, or Diffuser Discharge
Temperature
Checking for Blockage in Air-To-Air Evaporators or
Condensers
Maintenance
Changing the Battery
Cleaning the Lens
Cleaning the Housing
Troubleshooting
CE Certification
Specifications
Infrared
Laser
Electrical
Physical
Environmental
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Table Title Page
List of Tables
Model 72-820: OPERATING MANUAL
1. Symbols
2. Buttons and Connector
3. Surface Emissivity
4. Troubleshooting
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Figure Title Page
List of Figures
Model 72-820: OPERATING MANUAL
1 Symbols and Safety Markings
2 Infrared Thermometer
3 Thermometer Display
4 Buttons and Connector
5 Locating Hot or Cold Spot
6 Distance and Spot Size
7 Field of View
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Warning
Model 72-820: OPERATING MANUAL
Introduction
The Model 72-820 Infrared Thermometer (hereafter, the
“Thermometer”) can determine the surface temperature
by measuring the amount of infrared energy radiated
by the target’s surface. They have different distance to
spot (D:S) figure and different temperature range, details
see the contents.It features a temperature range of
0oF~1000oF and a distance-to-spot ratio of 12:1.
The non-contact infrared thermometer features low
power consumption design, allowing extended use
without the need to replace batteries. The highly intuitive
design allows fast easy temperature measurement for
increased efficiency in use.
The Thermometer may also be powered from a standard
computer USB port. This can prove very convenient in
situations were repeated battery changes are not
practical. The Thermometer will automatically select
between battery and USB port power.
Safety Information
A warning identifies conditions and actions that
pose hazards to the user. To avoid electrical
shock or personal injury, follow these guidelines:
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Do not point laser directly at eye or indirectly
off reflective surfaces.
Before using the Thermometer inspect the
case. Do not use the Thermometer if it appears
damaged. Look for cracks or missing plastic.
Replace the battery as soon as the battery
indicator appears.
Do not use the Thermometer if it operates
abnormally. Protection may be impaired.
When in doubt, have the Thermometer
serviced.
Do not operate the Thermometer around
explosive gas, vapor, or dust.
To avoid a burn hazard, remember that highly
reflective objects will often result in lower
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Table 1 and Figure 1 show various symbols and safety
markings that are on the Thermometer and in this
manual.
Explanation
Risk of danger. Important information.
See Manual.
Warning. Laser
Conforms to Standards of European Union
Low battery.
Symbol
Model 72-820: OPERATING MANUAL
Table 1. Symbols
lthan actual temperature measurements.
Do not use in a manner not specified by this
manual or the protection supplied by the
equipment may be impaired.
Caution
To avoid damaging the thermometer or the
equipment under test protect them from the
following:
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EMF (electro-magnetic fields) from arc
welders, induction heaters, etc.
Static electricity.
Thermal shock (caused by large or abrupt
ambient temperature changes – all 30 minutes
from the Thermometer to stabilize before use).
Do not leave the Thermometer on or near
objects of high temperature.
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Model 72-820: OPERATING MANUAL
Figure 1. Symbols and Safety Markings
Features
The Thermometer includes:
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Single-spot Laser Sighting
Intelligent USB power source
Backlit Display
Two level white colour Backlit Display (when using
USB power up, this feature will be on automatically).
Current Temperature Plus MIN, MAX, DIF, AVG
Temperature Displays/
Easy Emissivity Selector
Trigger Lock
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Celsius and Fahrenheit Temperature Measurement
Tripod mount
Included 9V Battery
Thermometer features are shown in Figure 2.
Battery Cover
Display
9V 6F22 Battery
Laser
Trigger
Display
The primary temperature display reports the current or
last IR temperature read until the 8-second hold time
elapses.
Figure 2. Infrared Thermometer
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A
B
C
D
C
A
DB
Model 72-820: OPERATING MANUAL
The secondary temperature display reports a choice of
maximum, minimum, difference between maximum and
minimum temperature or average value.
You can toggle through the maximum, minimum,
difference and average IR temperatures anytime the
display is on. The MAX, MIN, DIF andAV temperatures
are constantly calculated and updated when the trigger
is pressed. After the trigger is released, the MAX, MIN,
DIF and AV temperatures are held for 8 seconds.
HOLD
SCAN
Laser “On” Symbol
SCAN or HOLD
oC/oF Symbol (Celsius/Fahrenheit)
Primary temperature Display
Secondary temperature Display
Emissivity LO, MED, HI
Temperature values for the MAX, MIN, DIF,
AVG
Low Battery symbol. Appears when the
battery charge is <4.5V.
Figure 3. Thermometer Display
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Model 72-820: OPERATING MANUAL
Buttons and Connector
Figure 4. Buttons and Connector
Description
Press MODE button to toggle between MAX, MIN,
DIF, and AVG options.
Press MODE to turn the Thermometer on again
and displays the last measurement result.
Press to enter set up mode stepping through
Emissivity set up, Trigger Lock and Switching
oC/oF set up.
Details refer to the below Emissivity, Trigger Lock
and Switching oC/oF topics.
Press to turn the display backlight on and off.
icon will be on and off also.
When the Thermometer enters the setup up mode,
press to select an option, details refer to the
below Emissivity, Trigger Lock and Switching oC/
oF topics.
Press to turn the laser on and off. After laser
is on, will be shown.
When the Thermometer enters the user setup
mode, press to select an option, details refer
to the below Emissivity, Trigger Lock and Switching
oC/ oF topics.
After connecting the USB cable, the Thermometer
automatically selects USB power supply and two
levels white colour Backlit Display will be on.
Button /
Connector
MODE
SET
USB port
Table 2. Buttons and Connector
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Model 72-820: OPERATING MANUAL
How the Thermometer Works
Infrared thermometers measure the surface temperature
of an opaque object. The Thermometer’s optics sense
infrared energy, which is collected and focused onto a
detector. The Thermometer’s electronics then translate
the information into a displayed temperature reading
which appears on the display. The laser is used for
aiming purposes only.
Operating the Thermometer
The Thermometer turns on when you press the trigger.
The Thermometer turns off when no activity is detected
for 8 seconds.
To measure temperature, aim the Thermometer at the
target, pull and hold the trigger. Release the trigger to
hold a temperature reading.
Be sure to consider distance-to-spot size ratio and filed
of view. The laser is used for aiming only.
To find a hot or cold spot, aim the Thermometer outside
the target area. Then, slowly scan across the area with
an up and down motion until you located the hot or cold
spot. See Figure 5.
Figure 5. Locating Hot or Cold Spot
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Model 72-820: OPERATING MANUAL
As the distance (D) from the target being measured
increases, the spot size (S) of the area measured by
the unit becomes larger. The spot size indicates 90%
encircled energy. The maximum D:S is obtained when
the Thermometer is 600mm (23.6 in) form the target
resulting in a spot size of 20mm (0.79 in). See Figure 6.
Figure 6. Distance and Spot Size
Make sure that the target is larger than the spot size.
The smaller the target, the closer you should be to it.
See Figure 7.
Figure 7. Field of View
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Model 72-820: OPERATING MANUAL
Emissivity describes the energy-emitting characteristics
of materials. Most organic materials and painted or
oxidized surfaces have an emissivity of about 0.95.
If possible, to compensate for inaccurate readings that
may result from measuring shiny metal surfaces, cover
the surface to be measured with masking tape or flat
black paint (<150 oC / 302 oF) and use the high emissivity
setting. Allow time for the tape or paint to reach the
same temperatures as the surface beneath it. Measure
the temperature of the tape or painted surface.
If you cannot use paint or use tape, then you could
improve the accuracy of your measurements with the
emissivity selector. Even with emissivity selector, it can
be difficult to get a completely accurate infrared
measurement of a target with a shiny or metallic surface.
The Thermometer allows you to adjust the unit’s
emissivity for the type of surface before measured.
Refer to Table 2. But it is only a typical case. You could
base on your own case and materials to have different
setting.
To adjust values for emissivity, follow the below
procedure:
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3.
Press SET to select emissivity set up, icon E on the
display is blinking. The Thermometer steps through
emissivity set up, trigger lock and switching oC / oF.
Press to increase the value by 0.01 or press and
hold to access quick setting. The maximum value
is 1.00.
Press to decrease the value by 0.0 or press and
hold to access quick setting. The minimum value
is 0.10.
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Table 3. Surface Emissivity
Measure Surface
METALS
Aluminum
Oxidized
Alloy A3003
Oxidized
Roughened
Brass
Burnished
Oxidized
Copper
Oxidized
Electrical Terminal Blocks
Haynes
Alloy
Inconel
Oxidized
Sandblasted
Electoropolished
Switch Setting
0.2-0.4
0.3
0.1-0.3
0.3
0.5
0.4-0.8
0.6
0.3-0.8
0.7-0.95
0.3-0.6
0.15
Measure Surface
Iron Cast
Oxidized
Unoxidized
Molten
Iron Wrought
Dull
Lead
Rough
Oxidized
Molydbenum
Oxidized
Nickel
Oxidized
Platinum
Black
Steel
Cold-Rolled
Switch Setting
0.6-0.95
0.2
0.2-0.3
0.9
0.4
0.2-0.6
0.2-0.6
0.2-0.5
0.9
0.7-0.9
Model 72-820: OPERATING MANUAL
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Table 3. Surface Emissivity
Measure Surface
Iron
Oxidized
Rusted
NON-METALS
Asbestos
Asphalt
Basalt
Carbon
Unoxidized
Graphite
Carborundum
Ceramic
Clay
Concrete
Cloth
Switch Setting
0.5-0.9
0.5-0.7
0.95
0.95
0.7
0.8-0.9
0.7-0.8
0.9
0.95
0.95
0.95
0.95
Measure Surface
Ground Sheet
Polished Sheet
Zinc
Oxidized
Glass
Plate
Gravel
Gypsum
Ice
Limestone
Paper (any colour)
Plastic
Opaque
Soil
Water
Wood, (natural)
Switch Setting
0.4-0.6
0.1
0.1
0.85
0.95
0.8-0.95
0.98
0.98
0.95
0.95
0.9-0.98
0.93
0.9-0.95
Model 72-820: OPERATING MANUAL
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To lock or unlock the trigger, use the following
procedures:
1. Press SET to select trigger lock setting, the
will blink.
2. Press to select ON or OFF.
When the trigger is locked, the Thermometer will provide
continuous measurement. There is no need to pull the
trigger.
When the trigger is unlocked, the user must pull the
trigger for measurement. When the trigger is released,
the Thermometer will hold the measurement result
automatically.
1. Press SET to choose oC / oF selection mode,
2. Press to select oC or oF.
The display will remain activated 8 seconds after the
trigger is released. HOLD appears in the upper middle
of the display. When the trigger is pulled again, the
Thermometer will begin measuring in the last function
selected.
Typical Measurements
This section describes a variety of measurements often
performed by technicians.
User could select to turn on or off the backlight and
laser whenever you are making readings with the
Thermometer. But if you are using USB to power
up the Thermometer, the two levels white colour
backlight will be on automatically.
Relatively high emissivity normally means emissivity
setting of about 0.95.
Relatively low emissivity normally means emissivity
setting of about 0.30.
When the emissivity of an object is unknown,
Model 72-820: OPERATING MANUAL
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the user may cover the surface (temperature >150oC)
with black electric tape (emissivity of about 0.95). Allow
time for the tape to reach the same temperature as the
object to be measured. Measure and record the
temperature of the tape.
Target the Thermometer to the object to be measured,
adjust the emissivity setting to make it as the same
temperature as the tape. At this time, the Thermometer
emissivity setting is close to the emissivity of the object
to be measured, measurement could be started.
1.
2.
3.
4.
Press SET to select emissivity. Press / to select
relatively low emissivity for bright contacts, or 0.7
mid level for darkened contacts.
Press MODE to select MAX.
Measure line and load side of one pole without
releasing trigger.
Atemperature difference between the line and load
sides of a pole indicate increased resistance of
one point and a contactor may be failing.
1.
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4.
5.
Press SET and then press / to set emissivity to
relatively low for uninsulated connectors or relatively
high for plastic encased relays or for bakelite
enclosed relays or insulated connectors.
Press MODE to select MAX.
Start to scan.
Measure the relay casing, looking for hot spots.
Measure electrical connections on relay terminals
looking for hot spots.
1.
2.
3.
4.
5.
Press SET and then press / to set emissivity to
relatively high for paper covered fuse body or
insulated connections.
Press MODE to select MAX.
Scan the paper covered length of fuse.
Without releasing the trigger, scan each fuse.
Unequal temperatures between fuses may indicate
voltage or amperage imbalance.
Press SET and then press / to set emissivity to
relatively low, for metal fuses and caps and insulated
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6.
7.
buss connections.
Press MODE to select MAX.
Scan each end cap on each fuse/
Press SET and then press / to set emissivity to
relatively low for uninsulated connectors or buss
connections or relatively high for insulated
connections.
1.
Scan the conductor, moving toward direction of
electrical connector (quick connect, wire nut, buss
connection, or lug).
2.
Turn off heating, cooling, and blower.
Press SET to select emissivity. Press / to select
emissivity relatively high for painted surfaces or
window surfaces.
Press MODE to select MIN when opposite side of
wall is at lower temperature and or select MAX when
opposite side of wall is at higher temperature.
Measure an interior partition wall surface temperature.
Do not release the trigger. Record this temperature
as your baseline (or benchmark) for a “perfectly”
insulated wall.
Face the wall to be scanned. Stand 1.5m away to
scan a 5cm spot on the wall.
Scan horizontal rows of wall from top to bottom, or
horizontal rows of ceiling from wall to wall. Look for
greatest deviations from baseline temperature to
identify problems. This completes the insulation test
scan.
1.
2.
3.
4.
5.
6.
Model 72-820: OPERATING MANUAL
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