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UNI-T UT305A, User Manual, Page: 25 / 26

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Summary of Contents for UT305A

Page 1: ...nector How the Thermometer works Operating the Thermometer Locating a Hot or Cold Spot Distance and Spot Size Field of View Emissivity User Setup Emissivity Setup Trigger Lock Setup Switching HAL Setup LAL Setup DATA TC K Thermocouple Measurement HOLD Typical Measurements Testing Contactors Starters Testing Enclosed Relays Testing Fuses and Buss Connections Testing Electrical Connections ...

Page 2: ...ts 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 and T C Thermocouple Laser Electrical Physical Environmental ...

Page 3: ...3 6 10 14 23 Table Title Page List of Tables 1 Symbols 2 Buttons and Connector 3 Surface Emissivity 4 Troubleshooting ...

Page 4: ... 11 12 12 Figure Title Page List of Figures 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 ...

Page 5: ...ni Trend call 852 2950 9168 or visit Uni Trend web site at Safety Information Warning A warning identifies conditions and actions that pose hazards to the user To avoid electrical shock or personal injury follow these guidelines l Do not point laser directly at eye or indirectly off reflective surfaces l Before using the Thermometer inspect the case Do not use the Thermometer if it appears damaged...

Page 6: ...ge or abrupt ambient temperature changes all 30 minutes from the Thermometer to stabilize before use l Do not leave the Thermometer 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 Table 1 Symbols Symbol Explanation Risk of danger Important information See Manual Warning Laser Conforms to Standards o...

Page 7: ...l Two level white colour Backlit Display when using USB power up this feature will be on automatically l Current Temperature Plus MIN MAX DIF AVG Temperature Displays l Easy Emissivity Selector l Trigger Locked l Degree Celsius and Fahrenheit Temperature Selectable l Tripod mount l One 9V Battery ...

Page 8: ...ce and average IR temperatures anytime the display is on by pressing the yellow button 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 until the Thermometer is auto power off Notes When the battery is low appears on the display The last selection MAX MIN DIF AVG is maint...

Page 9: ...9 Buttons and Connector Figure 4 Buttons and Connector ...

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Page 11: ...e 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 Locating a Hot or Cold Spot To find a hot or col...

Page 12: ...t size indicates 90 encircled energy The maximum D S is obtained when the Thermometer is 600mm 60 in form the target resulting in a spot size of 20mm 2 in See Figure 6 Figure 6 Distance and Spot Size Field of View 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 ...

Page 13: ...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 User Setup Press SET button to step through Emissivity Setup Trigger Lock Switching Normal Measurement Press YELLOW button to save and exit Setup Emissivity Setup This feature is...

Page 14: ...ermometer 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 ...

Page 15: ... SET to choose selection mode 2 Press or to select or HAL Setup This feature is to set up the high limit When carrying out measuring the Thermometer beeps continuous if the temperature is over this limit 1 Press YELLOW button to toggle to HAL mode 2 Press to increase the value by 0 1 or press and hold to access quick setting until the maximum value is reached The thermometer stops and beeps 3 Pres...

Page 16: ...higher than the LAL value DATA This feature is to store the data measuring under infrared mode 1 The maximum number of data to be stored is 99 2 When the storage is empty it displays 3 Under non measurement mode press and hold DATA and for 8 seconds to clear the stored data the Thermometer beeps 4 Under measurement mode press YELLOW button to toggle to DATA mode 5 Press or to select the location o...

Page 17: ... the emissivity of the object to be measured user could cover the surface to be measured temperature 150 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 temperatur...

Page 18: ... fuse Unequal temperatures between fuses may indicate voltage or amperage imbalance 5 Press SET and then press to set emissivity to relatively low for metal fuses and caps and insulated buss connections 6 Press YELLOW button to select MAX 7 Scan each end cap on each fuse Note Unequal temperatures or a high temperature indicates loose or corroded connection through the fuse buss spring clip Testing...

Page 19: ... 6 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 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 wa...

Page 20: ...eady state operating temperatures 4 Aim the Thermometer at the surface to be measured 5 Start recording temperature 6 Slowly move the Thermometer up the belt toward second sheave l If belt is slipping sheave temperature will be high from friction l If belt is slipping belt temperature will remain high between sheaves l If belt is not slipping belt temperature will reduce between sheaves l If inner...

Page 21: ...ling temperatures indicate a space between the heat tubes 1 Press SET and then press to select relatively high emissivity 2 Press YELLOW button to select MAX 3 To locate radiant heat tubes in floor temporarily elevate the loop temperature to create hotter spots for identifying tubing runs 4 Before releasing trigger press YELLOW button to toggle between MIN MAX DIF floor temperatures and record the...

Page 22: ...perature chart l All condenser return bend hairpins should be at or slightly less than condenser saturation temperature l If a group of return bends hairpins do not conform to expected temperatures that indicates a blocked or restricted distributor or distributor tube Maintenance Changing the Battery To install or change the 9V battery open the battery compartment the battery as shown in Figure 2 ...

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Page 26: ...ng Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town Dongguan City Guang Dong Province China Postal Code 523 925 Headquarters Uni Trend Group Limited Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com ...

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