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17

② 

The unit cannot measure through transparent surfaces 

such as glass. It will measure the surface temperature of 

the glass instead. 

   

Steam,  dust,  smoke,  etc.,  Can  prevent  accurate 

measurement by obstructing the unit’s optics. 

 

Emissivity 

Emissivity 

is 

term 

used 

to 

describe 

the 

energy-emitting characteristics of materials. 

Most  (90%  of  typical  applications)  organic  materials 

and painted or oxidized surfaces have an emissivity of 

0.95 (pre-set in the unit). Inaccurate readings will result 

from  measuring  shiny  or  polished  metal  surfaces.  To 

compensate,  cove  the  surface  to  be  measured  with 

masking tape or flat black paint. Allow time for the tape 

to  reach  the  same  temperature  as  the  material 

underneath it. Measure the temperature of the tape or 

painted surface. 

 

 

 

 

Emissivity Values   

Содержание DT-8833

Страница 1: ...Non Contact Infrared Thermometers DT 8833 Operation Manual...

Страница 2: ...TRODUCTION 3 FEATURES 3 WIDE RANGE APPLICATION 4 SAFETY 4 DISTANCE SPOT SIZE 5 SPECIFICATIONS 6 FRONT PANEL DESCRIPTION 8 INDICATOR 9 BUTTONS 9 MEASURMENT OPERATION 12 BATTERY REPLACEMENT 15 NOTES 15...

Страница 3: ...ic operation Type K thermocouple functionality is also built in Proper use and care of this meter will provide years of reliable service FEATURES Precise non contact temperature measurement Type K tem...

Страница 4: ...printing measure ink and Dryer temperature HVAC R Diesel and Fleet maintenance 1 SAFETY Use extreme caution when the laser beam is turned on Do not let the beam enter your eye another person s eye or...

Страница 5: ...becomes larger The relationship between distance and spot size for each unit is listed below The focal point for each unit is 914mm 36 The spot sizes indicate 90 encircled energy Fig 1 MODEL 8833 D S...

Страница 6: ...2498 1 Accuracy 50 to 1000 o C 1 5 of reading 3 1000 to 1370 o C 1 5 of reading 3 6 IR Measurement IR Temperature range 50 to 800 o C 58 to 1472 D S 13 1 Resolution 0 1 o C 0 1 Accuracy 50 to 20 58 t...

Страница 7: ...for positive polarity Minus sign for negative polarity Diode laser output 1mW Wavelength 630 670nm Class 2 II laser product Operating temp 0 to 50 32 to 122 Storage temp 20 to 60 4 to 140 Relative hum...

Страница 8: ...s spot size The smaller the target the closer you should be to it When accuracy is critical make sure the target is at least twice as large as the spot size 3 FRONT PANEL DESCRIPTION IR sensor Laser p...

Страница 9: ...symbol Temperature values for the MAX MIN DIF AVG HAL LAL And TK Symbols for EMS MAX MIN DIF AVG HAL LAL and TK Current temperature value 11 Low battery 5 Buttons pbutton forEMS HAL LAL MODE button f...

Страница 10: ...h time you take a reading This data is stored and can be recalled with the MODE button until a new measurement is taken When the trigger is pulled again the unit will begin measuring in the last mode...

Страница 11: ...SET ALARM Select the temperature units o C or o F by using the o C o F switch To lock the unit on for continuous measurement slide the middle switch LOCK ON OFF right If the trigger is pulled while t...

Страница 12: ...the meter by its Handle Grip and point it toward the surface to be measured Pull and hold the Trigger to turn the meter on and begin testing The display will light if the battery is good Replace the b...

Страница 13: ...t surface and test the temperature of same point with IR measurement After both values are stable press UP or DOWN button for confirmation Then emissivity of the object will be shown at the upper side...

Страница 14: ...e meter by its handle point the IR Sensor toward the object whose temperature is to be measured The meter automatically compensates for temperature deviations from ambient temperature Keep in mind tha...

Страница 15: ...perature of an object The unit s optics sense emitted reflected and transmitted energy which is collected and focused onto a detector The unit s electronics translate the information into a temperatur...

Страница 16: ...unit becomes larger See Fig 1 Locating a hot Spot To find a hot spot aim the thermometer outside the area of interest then scan across with an up and down motion until you locate hot spot Reminders No...

Страница 17: ...ing characteristics of materials Most 90 of typical applications organic materials and painted or oxidized surfaces have an emissivity of 0 95 pre set in the unit Inaccurate readings will result from...

Страница 18: ...oncrete 0 94 Human skin 0 98 Cement 0 96 Lather 0 75 to 0 80 Sand 0 90 Charcoal powder 0 96 Earth 0 92 to 0 96 Lacquer 0 80 to 0 95 Water 0 92 to 0 96 Lacquer matt 0 97 Ice 0 96 to 0 98 Rubber black 0...

Страница 19: ...78 to 0 82 Brick 0 93 to 0 96 Textiles 0 90 9 MAINTENANCE CLEARING Repairs or serving aren t covered in this manual should only be performed by qualified personnel Periodically wipe the case with a d...

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