UNI-T UT301A, UT301C, UT302A, UT301B, UT302B Operating Instructions Manual

...

Emissivity

Distance and Spot Size

Field of View

To contact Uni-Trend. call (852) 2950 9168 or visit UniTrend web site at www.uni-trend.com

Introduction

The Model UT301A/B/C,UT302A/B/C/D

and

UT303A/B/C/D/E Infrared Thermometers (hereafter referred

to as "the Thermometer")

can determine the surface

temperature by m easuring the

amount of infrared energy

radiated by the target surface.

They have different

Distance to Spot(D:S) ratios and

different temperature ranges, read the manual for details.

The Thermometer is a non-contact infrared instrument designed with low power consumption, which can make the measurements much faster and easier and meanwhile s

ave you amount of time from frequent battery replacement. It can be powered by the battery or the source with USB connected to.

This Manual uses UT303A/B/C/D/E as illustration.

Contacting Uni-Trend

Warning

Safety Information

A warning identifies conditions and actions that pose hazards to the user. To avoid electrical shock or personal injury, follow these guidelines:

z z z

z z

z z z

z z

Do not point the laser toward anyone's eye or allow the laser to strike the eye from a reflective surface.

Before using the Thermometer inspect the

case.

Do not use the Thermometerif 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 than actual temperature measurements. Do not use in a manner not specified by this manual or the protection supplied by the equipment may be impaired. To avoid damaging the thermometer or the equipment under test protect them from the following: EMF (electro-magnetic fields) from arc welders, induction heaters, etc; static electricity; thermal shock (caused by large or abrupt ambient temperature changes-- wait for 30 minutes for the Thermometer to stabilize before use;

placed on or near objects of high temperature.

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 Indication

Symbol

Table 1. Symbols

Figure 1. Symbols and Safety Markings

Features

The Thermometer includes:

Single Laser Pointer Intelligent USB-Powered Level 2 White Backlight(With USB connected,)

this feature will be on automatically). Current Temperature Plus MIN, MAX, DIF, AVG Display Functions Adjustable Emissivity Trigger Locked ℃/℉Selectable Tripod mount One 9V Battery

Thermometer features are shown in Figure 2.

Battery Cover

Display

9V 6F22 Battery

Laser

Trigger

Display

The primary display reports the current or last IR

temperature reading until the 8-second hold time

elapses.

Figure 2. Infrared Thermometer

The secondary 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 and AV 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.

A B C D

HOLD SCAN

Laser ìOnî Symbol SCAN or HOLD

oC/o

F 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

Buttons and Connector

Figure 4. Buttons and Connector

Description

Press MODE button to toggle between MAX,MIN, DIF, andAVG 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/o

F set up.

Refer to the below Emissivity,Trigger Lock

and Switching

oC/o

F topics for details.

Press

to turn the display backlight on and off.

icon will be on and off also. When the Thermometer enters thesetup up mode, press

to select an option, refer to the below

Emissivity, Trigger Lock and Switching

F topics for details.

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/o

F topics.

Button / Connector

MODE

SET

Table 2. Buttons and Connector

Connect USB cable for supply power to the unit or data transmission with the software; Backlight will automatically turn on;

USB port

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

Locating a Hot or Cold Spot

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

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 (60 in) from the target

resulting in a spot size of 20mm (2 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

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

C / 302 F) 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 shinyor metallic surface.

The Thermome ter allows you to adjust the unit's emissivity for the type of surface before measured. Refer to Table 3. 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:

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

C / 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.

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

Iron Cast

Oxidized

Unoxidized

Molten

Iron Wrought

Dull

Lead

Rough

Oxidized

Molydbenum

Oxidized

Nickel

Oxidized

Platinum

Black

Steel

Cold-Rolled

0.6-0.95

0.2

0.2-0.3

0.9

0.4

0.2-0.6

0.2-0.5

0.9

0.7-0.9

Iron

Oxidized

Rusted

NON-METALS

Asbestos

Asphalt

Basalt

Carbon

Unoxidized

Graphite

Carborundum

Ceramic

Clay

Concrete

Cloth

0.5-0.9

0.5-0.7

0.95

0.7

0.8-0.9

0.7-0.8

0.9

0.95

Ground Sheet

Polished Sheet

Zinc

Oxidized

Glass

Plate

Gravel

Gypsum

Ice

Limestone

Paper (any colour)

0.4-0.6

0.1

0.85

0.95

0.8-0.95

0.98

0.95

Plastic

Opaque

Soil

Water

Wood, (natural)

0.95

0.9-0.98

0.93

0.9-0.95

Measure Surface Switch Setting

P/N:110401104253X

Tolock or unlock the trigger, follow the belowprocedures:

1. Press SET to select trigger lock setting, the

blinking.

2. Press

to select ON or OFF. When the trigger is locked, the Thermometer is on for continuous measurement, there is no need to pull the trigger. When the trigger is unlocked, user needs to pull the trigger for measurement. When you release the trigger, the Thermometer will keep hold the measurementresult 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 Thermo meter, the Level 2 whit e 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 user cannot identify the emissivity of the object

Trigger Lock

Swithing

HOLD

Tips:

to be measured, user could cover the surface to be measured (temperature >150

C) 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 Thermometeremissivity setting is close to the emissivity of the object to be measured, measurement could be started.

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. A temperature difference between theline and load sides of a pole indicate increased resistance of one point and a contactor may be failing.

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.

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 metalfuses and caps and insulated

Testing Contactors (Starters)

Testing Enclosed Relays

Testing Fuses and Buss Connections

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.

Scan the conductor, moving toward direction of electrical connector (quick connect, wire nut, buss connection, or lug).

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 wallsurface temperature. Do not release the trigger. Record this temperature as your baseline (or benchmark) for a ìperfectlyî 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.

Testing Electrical Connections

Scanning Walls for Air Leaks or Insulation Deficiencies

Turn on the blower (no heat, no cooling) and retest. If test results with the blower on are different than results with the blower off, this may indicate air leaks in conditioned envelope walls. The air leaks are caused by duct leaks that create a pressure differential across the conditioned space envelope.

Warning

To avoid injury when testing bearings:

Do not wear loose clothing, jewelry, or anything around neck when working around moving parts such as motors, belts, blower, and fans. Make sure an electrical disconnect is within reach and operating correctly and freely. Do not work alone.

Press SET and then press/to select relatively high emissivity. Press MODE to select MAX. Enable motor and allow it to reach steady state operating temperatures. Disable the motor if possible. Measure the two motor bearing temperatures

Compare the two motor bearing temperatures. Unequal temperatures or a high temperature can indicate a lubrication or other bearing problem that is resulting from excess friction. Repeat the sequence for the blower bearings.

Testing Bearings

Testing Belts and Sheaves

Checking Hydronic Radiant Heat Applications

Measuring Grille,Register,or Diffuser Discharge Temperature

Press SET and then press

to select relatively

high emissivity. Press MODE to select MAX. Enable the motor and allow it to reach a steady state operating temperatures. Aim the Thermometer at thesurface to be measured. Start recording temperature Slowly move the Thermometer up the belt toward second sheave.

If belt is slipping, sheave temperature will be high from friction. If belt is slipping, belt temperature will remain high between sheaves. If belt is not slipping, belt temperaturewill reduce between sheaves. If inner surfaces of sheaves are not a true ìVî shape, this indicates belt slippage and will continue to operate at elevated temperatures until sheave is replaced. Sheaves must be properly aligned (includeì pitch

& yawî) for belt and sheaves tooperate at appropriate

temperatures. A straight edge or taut string, can be used to check alignments. Motor sheave should operate at a temperature consistent with blower sheaves. If motor sheave is at a higher temperature at motor shaft than at outer circumference, belt is probably not slipping. If outer circumference of sheave is at higher temperature than sheave at motor shaft, then belt is probably slipping and sheaves may be misaligned.

Press SET and then press

to select relatively

high emissivity. Press MODE to select MAX. To locate radiant heat tubes in floor, temporarily elevate the loop temperature to create hotter spots for identifying tubing runs. Before releasing trigger, press MODE to toggle between MIN, MAX, DIF floor temperatures and record the temperature for future comparison and trending under similar conditions.

Radiant heat tubes in the floor will normally run parallel to the outside walls. Starting at the floor wall juncture, scan parallel to the wall while moving into the room away from the wall. Parallel to the outside wall you should find parallel isothermal rows indicating the location of heat tubes below the surface. Perpendicular to the outside wall, you should find rising and falling temperatures at equal distances. High temperatures indicate you are scanning a heat tube beneath the floor surface, low falling temperatures indicate a space between the heat tubes.

Press SET and then press

to select relatively high emissivity. Aim the Thermometer at the discharge air grille, register, or diffuser. Measure discharge temperature. Release trigger to freeze the temperature reading for 8 seconds and record this temperature. Grille, register, or diffuser temperature should be equivalent to discharge temperature at the air handler.

Remove panels to gain access to coil return bends or hairpins. Press SET and then press

to select relatively high emissivity for copper tube. Start the refrigeration system. Aim the Thermometer at coil turn bends/hairpins. Start recording temperature. Take temperature of each return bend/hairpin.

All evaporator return bends/hairpins should be at or slightly above evaporator saturation temperature from the pressure/temperature chart. All condenser return bend/hairpins should be at or slightly less than condenser saturation temperature. If a group of returnbends/hairpins do not conform to expected temperatures, that indicates a blocked or restricted distributor or distributor tube.

Maintenance

Changing the Battery

Cleaning the Lens

Cleaning the Housing

To install or change the 9V battery, open the battery compartment the battery as shown in Figure 2.

Blow off loose particles using clean compressed air. Carefully wipe the surface with a moist cotton swab. The swab may be moistened with water.

Use soap and water on a damp sponge or soft cloth.

To avoid damaging the Thermometer, do NOT submerge it in water.

Caution

Checking for Blockage in Air-To-Air Evaporators or Condensers

Problem

Target temperature is over range

Target temperature is under range

Low Battery

Possible dead battery

1. Low or dead battery

2. Ambient temperature above 40

(104

Symptom

OL (on display)

-OL (on display)

Blank Display

Laser does not work

Action

Select target with specifications

Replace Battery

Check and / or replace battery

1. Replace battery

2. Use in area with lower ambient temperature.

Table 4. Troubleshooting

The Thermometer conforms to the following standards:

zEN61326-1 EMC zEN60825-1 Safety

Certification testing was conducted using a frequency range of 80 to 100MHz with instrument in three orientations.

Troubleshooting

CE Certification

Measurement Range (UT301A): -18oC to 350

(0oF to 662oF)

Measurement Range (UT301B): -18

C to 450

(0oF to 842oF)

Measurement Range (UT301C): -18

C to 550

(0oF to 1022oF)

Measurement Range (UT302A): -32

C to 450

(-26oF to 842oF)

Measurement Range (UT302B): -32

C to 550

(-26oF to 1022oF)

Measurement Range (UT302C): -32

C to 650

(-26oF to 1202oF)

Measurement Range (UT302D): -32

C to 1050

(-26oF to 1922oF)

Measurement Range (UT303A): -32

C to 650

(-26oF to 1202oF)

Measurement Range (UT303B): -32

C to 850

(-26oF to 1562oF)

Measurement Range (UT303C): -32

C to 1050

(-26oF to 1922oF)

Measurement Range (UT303D): -32

C to 1250

(-26oF to 2282oF)

Measurement Range (UT303E): -32oC to 1550

(-26oF to 2822oF) Spectral Range : 8 to 14 microns

Accuracy:

1.8% or (1.8oC/4oF)

Temperature than less

0oC , Accuracy add to 1oC(2oF)

(Assumes ambient operating temperature of 23 to

25 C (73 to 77oF))

Repeatability : 0.5% of reading or 1

C/2oF Response Time (95%) : 250ms Distance to Spot (D:S) (UT301A/B/C): 12:1 Distance to Spot (D:S) (UT302A/B/C/D): 20:1 Distance to Spot (D:S) (UT303A/B/C/D/E): 30:1

Specifications

Infrared

Sighting: Single point laser Power: Class 2 (II) operation; Output <1mV, wavelength

630 to 670mm

Power Supply : 6F22 9V Battery Power Consumption : At least 30 hours battery life

(Alkarine), At least10 hours

battery life (General Purpose)

Weight : 0.322kg Size : 17.69cm (H) x 16.36 cm (L) x 5.18cm (W)

Operating Temperature Range: 0

C to 50

(32oF to 120oF) Relative Humidity : 0 to 75% noncondensing Storage Temperature : -20

C to 65oC (-4oF to 150oF)

Emissivty Adjustment : 0.10~1.00 Display Resulation :

0.1oC (0.1oF)

Secondary Display Information : Maximum, Minimum,

Laser

Electrical

Physical

Environmental

Differential, Average

This operating manual is subject to change without notice.

** END **

UNI-T UT301A, UT301C, UT302A, UT301B, UT302B Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual