background image

5

Infrared Thermometer

5.3 Emissivity

Depending on the nature of the material which is to be scanned, different levels
of energy will be encountered (emissivity). However, most organic and painted or
oxidised surfaces have an emissivity of 0.95. To overcome any problems with
polished or mirrored surfaces, they should be covered in masking tape or matt
black paint before scanning. Allow time for the tape or paint to attain the same
temperature as the target object before scanning.

5.4 Hot Spots

In order to locate a hot spot, aim the thermometer away from the target, before
scanning across the target in an up and down motion, keeping the trigger
depressed until the hot spot is located (See Fig. 4). 

5.5 D:S Ratio (Field of View)

The D : S Ratio (Distance to Spot size) or Field Of View is 12 : 1 (See Fig. 5). This
ratio indicates that when the target object is 300mm (12") away from the
thermometer, then the target object should be at least 25mm (1"). In general, it is
good practice to ensure
that the target is larger
than the spot size. The
smaller the spot size,
t h e   c l o s e r   t h e
thermometer should be
to the target object. For
increased accuracy, the
target should be twice
the size of the spot size.

Fig 5.

Target Area

Keep trigger depressed

while scanning in an up

and down motion.

Fig 4.

EDI-312-4000K_Instructions.qxd  28/07/2010  15:34  Page 5

Summary of Contents for IRT537

Page 1: ... mi in n m mo od de e s se el le ec ct ti io on n T Te em mp pe er ra at tu ur re e r ra an ng ge e 2 20 0 C C t to o 5 53 37 7 C C O Op pt ti io on na al l C C F F d di is sp pl la ay y s se el le ec ct ti io on n D Di is st ta an nc ce e S Sp po ot t s si iz ze e r ra at ti io o 1 12 2 1 1 L La as se er r p po oi in nt te er r b be ea am m E Em mi is ss si iv vi it ty y 0 0 9 95 5 C Cl le ea ar ...

Page 2: ...thermometer not to point the laser in the direction of any other person animal or moving object The user should also be aware of the danger posed by indirect exposure via reflective surfaces D Di ir re ec ct t e ey ye e c co on nt ta ac ct t w wi it th h t th he e l la as se er r b be ea am m c co ou ul ld d r re es su ul lt t i in n p pe er rm ma an ne en nt t d da am ma ag ge e D DO O N NO OT T ...

Page 3: ...or 8 MAX MIN indicator 9 Battery low indicator 10 Current temperature 11 Data hold indicator 11 12 13 14 15 16 17 18 19 20 1 11 4 5 10 9 8 6 2 3 7 11 Collimator 12 Laser emission aperture 13 Temperature detect aperture 14 Trigger 15 Battery cover 16 LCD display 17 Laser button 18 C F button 19 Mode button 20 Backlight button Fig 1 Fig 2 EDI 312 4000K_Instructions qxd 28 07 2010 15 34 Page 3 ...

Page 4: ...ter and processed through a sensor The sensor generates a measurable voltage output which is in proportion to the target temperature The output is processed and displayed on the LCD 5 2 Instructions For Use Pull and hold trigger laser pointer is off by default to activate the thermometer Point the thermometer toward the target object and depress the trigger On releasing the trigger the reading wil...

Page 5: ...arget before scanning across the target in an up and down motion keeping the trigger depressed until the hot spot is located See Fig 4 5 5 D S Ratio Field of View The D S Ratio Distance to Spot size or Field Of View is 12 1 See Fig 5 This ratio indicates that when the target object is 300mm 12 away from the thermometer then the target object should be at least 25mm 1 In general it is good practice...

Page 6: ...ad di ia at to or r With the engine running at the normal operating temperature the user should check the temperature drop on the inlet and outlet The drop in temperature should be fairly even Scan the radiator surface see Fig 4 for any cold spots which are symptomatic of a blockage T Th he er rm mo os st ta at t To check that a vehicles thermostat is performing as expected it is necessary to moni...

Page 7: ...hould not differ by 3 C The front brakes should be around 30 C hotter than the rear brakes If one brake on an axle does not meet these criteria then it is likely that the brake showing the lower temperature is faulty T Ty yr re es s After driving the vehicle for a few miles readings can be taken from the outer centre and inner tread A higher temperature at the inner and outer sections of the tread...

Page 8: ...essories and packaging materials in an environmentally friendly manner For EU and EEA countries only In observance of European Directive 2002 96 EC on Waste Electrical and Electronic Equipment WEEE and its implementation in accordance with national law electrical goods that have reached the end of their life must be collected separately and returned to an environmentally compatible recycling facil...

Reviews: