Tenma 72-820 Operating Manual Download Page 25

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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:

EN61326-1 EMC

EN60825-1 Safety

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

Troubleshooting

CE Certification

Model 72-820: OPERATING MANUAL

This Manual: http://www.manuallib.com/file/2592895

Summary of Contents for 72-820

Page 1: ...ib com ManualLib com collects and classifies the global product instrunction manuals to help users access anytime and anywhere helping users make better use of products Home http www manuallib com Chinese http www shuomingshuku com This Manual http www manuallib com file 2592895 ...

Page 2: ...Infrared Thermometer 72 820 This Manual http www manuallib com file 2592895 ...

Page 3: ...Model 72 820 OPERATING MANUAL This Manual http www manuallib com file 2592895 ...

Page 4: ...ons 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 o C o F HOLD Typical Measurements Testing Contactors Starters Testing Enclosed Relays Testing Fuses and Buss Connections Testing Electrical Connections This Manual http www manuallib com file 2592895 ...

Page 5: ...elts 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 This Manual http www manuallib com file 2592895 ...

Page 6: ...3 6 9 13 22 Table Title Page List of Tables Model 72 820 OPERATING MANUAL 1 Symbols 2 Buttons and Connector 3 Surface Emissivity 4 Troubleshooting This Manual http www manuallib com file 2592895 ...

Page 7: ...ures 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 This Manual http www manuallib com file 2592895 ...

Page 8: ...is 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 l l l l l l Do not point laser directly at eye or indirectly off refle...

Page 9: ... 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 l l l l 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 Thermomete...

Page 10: ...lly Current Temperature Plus MIN MAX DIF AVG Temperature Displays Easy Emissivity Selector Trigger Lock l l l 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 tim...

Page 11: ...IF 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 HOLD SCAN Laser On Symbol SCAN or HOLD o C 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 ...

Page 12: ... 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 o C o F 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 o...

Page 13: ...er 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 Thermome...

Page 14: ... 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 This Manual http www manuallib com file 2592895 ...

Page 15: ...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 val...

Page 16: ...ctoropolished 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 This Manual http www manuallib ...

Page 17: ...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 This Manual http www manuallib com file 2592895 ...

Page 18: ...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 ...

Page 19: ...en the line and load sides of a pole indicate increased resistance of one point and a contactor may be failing 1 2 3 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 Mea...

Page 20: ...faces 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 h...

Page 21: ...ower 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 ...

Page 22: ... sheaves are not a true V shape this indicates belt slippage and will continue to operate at elevated temperatures until sheave is replaced Sheaves must be properly aligned include pitch yaw for belt and sheaves to operate 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 s...

Page 23: ... 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 1 2 3 4 5 Press SET and then press to sel...

Page 24: ...rpins should be at or slightly less than condenser saturation temperature If a group of return bends hairpins do not conform to expected temperatures that indicates a blocked or restricted distributor or distributor tube Maintenance 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 th...

Page 25: ...tions 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 l EN61326 1 EMC l EN60825 1 Safety Certification testing was conducted using a frequency range of 80 to 100MHz with instrument in three orientations Troubleshooting CE Certific...

Page 26: ...se Time 95 250ms Distance to Spot D S 12 1 Emissivty Adjustment 0 10 1 00 Display Resulation 0 1 o C 0 1 o F Secondary Display Information Maximum Minimum Differential Average 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 least 10 hours battery life General Purpose ...

Page 27: ...L x 5 18cm W Operating Temperature Range 0 o C to 50 o C 32 o F to 120 o F Relative Humidity 0 to 75 noncondensing Storage Temperature 20 o C to 65 o C 4 o F to 150 o F Model 72 820 OPERATING MANUAL This Manual http www manuallib com file 2592895 ...

Page 28: ...25 Model 72 820 OPERATING MANUAL This operating manual is subject to change without notice END This Manual http www manuallib com file 2592895 ...

Page 29: ...del 72 820 OPERATING MANUAL Copyright 2007 Tenma Test Equipment All rights reserved Tenma Test Equipment 405 S Pioneer Blvd Springboro Ohio 45066 www tenma com This Manual http www manuallib com file 2592895 ...

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