background image

 

 

HT3302

 

 

 

EN - 8

 

Fig. 8: Setting the emissivity value of the surface 

 
9.  The radiating power or emissivity “

” is a value between 0 and 1 which indicates the 

capacity of an object to emit energy in the infrared frequency range. This parameter 
depends both on the material the object is made of and on the finishing (painting). 
Parameter “

” is set by default to 0.95 because approximately 90% of the objects has 

such an radiating power. 

Determining this parameter is critical when polished or 

shiny surfaces are involved

. To evaluate emissivity under such conditions, cover the 

surface to be measured with masking tape or flat black paint, allow time for the area to 
reach the same temperature as the material underneath it and measure with emissivity 
set to 1.00. Compare the value read with the value measured by a thermometer with K 
contact probe in the same spot, then reduce emissivity value until obtaining the same 
temperature value on both thermometers. The following Table 1 shows the emissivity 
value of some common materials 

 

Material 

 

Material 

 

Water 0.96 Bricks 0.75 

Stainless steel 

0.14 

Tape 

0.96 

Aluminium foil 

0.09 

Brass foil 

0.06 

Asphalt 0.95 

Human 

skin 

0.98 

Mat black paper 

0.86 

PVC plastic 

0.93 

Cement 0.97 

Polycarbonate 

0.80 

Cast iron 

0.81 

Oxydized Copper 

0.78 

Chalk 0.75  Rust  0.80 

Rubber 0.95  Paint  0.90 

Wood 0.85  Earth 0.93 

Table 1: Emissivity values of common materials 

10. The symbol “EMS” flashes on the display. Move the 

J

 key to “+” or “-” to set the desired 

emissivity value between 

0.01

 and 

1.00

 (default EMS value = 0.95). Keep the 

J

 key 

pressed in position “+” or “-” to quickly scroll through the values. 

11. Press  the 

J

 key to confirm selection and go on to next item. 

 

 

 

 

Summary of Contents for HT3302

Page 1: ...Copyright HT ITALIA 2015 Release 1 01 15 10 2015 HT3302 Manuale d uso User manual Manual de instrucciones Bedienungsanleitung Notice d utilisation...

Page 2: ...Indice generale General index ndice general Inhalt Table des mati res ITALIANO IT 1 ENGLISH EN 1 ESPA OL ES 1 DEUTSCH DE 1 FRAN AIS FR 1...

Page 3: ...Copyright HT ITALIA 2015 Release EN 1 01 15 10 2015 ENGLISH User manual...

Page 4: ...bols shown on the display 6 4 3 Description of function keys 6 4 3 1 Trigger key T 6 4 3 2 Joystick key J 6 5 OPERATING INSTRUCTIONS 7 5 1 General menu description 7 5 2 Temperature measurement 11 6 M...

Page 5: ...storage in extreme environmental conditions let the instrument resume normal operating conditions before using it If the thermometer is moved quickly from a cold to a hot environment some condensation...

Page 6: ...er if flammable gas is present If symbol is displayed during use interrupt testing and replace the batteries according to the procedure described in 6 2 Be extremely careful when the laser pointer is...

Page 7: ...int of view However we suggest you to check it rapidly to detect possible damage which may have occurred during transport In case anomalies are found immediately contact the Dealer We also recommend c...

Page 8: ...area laser pointer 3 Protection ring 4 Trigger key T 5 Instrument handle 6 Strap hole Fig 1 Description of the instrument s front side CAPTION 1 LCD display 2 Joystick key J for internal navigation 3...

Page 9: ...ay 10 Emissivity indication 11 Main LCD display 12 Active built in illuminator Fig 4 LCD display description 4 3 DESCRIPTION OF FUNCTION KEYS 4 3 1 Trigger key T The Trigger key T see Fig 1 part 4 all...

Page 10: ...white LED illuminator upon pressing the T key 4 Press the J key to confirm selection and go on to next item Fig 6 UV function activation 5 The symbol UV flashes on the display Move the J key to or to...

Page 11: ...ivity set to 1 00 Compare the value read with the value measured by a thermometer with K contact probe in the same spot then reduce emissivity value until obtaining the same temperature value on both...

Page 12: ...the J key to or to set the value of the maximum alarm threshold on temperature measurement between values 30 C and 650 C or OFF disabled Keep the J key pressed in position or to quickly scroll throug...

Page 13: ...21 Press the J key to confirm selection and go on to next item Fig 13 Activation of Auto Power OFF APO function on measurement 22 The symbol APO flashes on the display Move the J key to or to enable...

Page 14: ...ral hole see Fig 14 Fig 14 Opening the protection ring 4 Press and hold keep the Trigger key T to activate the instrument and direct it towards the surface of the object whose temperature must be meas...

Page 15: ...large as the spot size To find a Hot Spot aim the thermometer at the measured object then move the instrument across the object until a hot spot is located Fig 17 Correct measuring conditions 7 Releas...

Page 16: ...ed above Fig 19 Measuring output temperature of HVAC systems Detection of dispersion of refrigerating agent in car engines and HVAC systems 1 Activate the UV Ultraviolet function with blue LEDs see 5...

Page 17: ...EPLACEMENT When the display shows the symbol and the message Low replace the batteries CAUTION Only expert and trained technicians should perform this operation Before removing batteries disconnect al...

Page 18: ...N61326 2 2006 Laser source IEC EN60825 1 2007 Class 3R UV source IEC62471 Group 1 Max operating altitude 2000m 6592ft Vibrations 2 5g compliance with IEC60068 2 6 10 200Hz Shock 50g compliance with IE...

Page 19: ...of interventions performed by unauthorized personnel Modifications to the instrument performed without the manufacturer s explicit authorization Use not provided for in the instrument s specifications...

Page 20: ...Via della Boaria 40 48018 Faenza RA Italy Tel 39 0546 621002 4 linee r a Fax 39 0546 621144 Email ht htitalia it http www ht instruments com...

Reviews: