HTC HT-856 User manual

User's Manual
Infrared Thermometer
Please read this user's manual thoroughly before using this unit
and keep it properly for yourfuture reference.

Contents
1. Introduction................................................................ 1
2. Features ...................................................................... 2
3. Application ................................................................. 3
4. Safety.......................................................................... 3
5. Field of View.............................................................. 4
6. Specifications ............................................................. 5
7. Meter Description....................................................... 7
8. LCD Display Description........................................... 8
9. Operating Instruction.................................................. 9
10. Notes....................................................................... 13
11. Accessories ............................................................. 15

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1. Introduction
Congratulations on your purchase of our professional non-contact
infrared thermometers with Type-K input measurement.
These units can provide fast, easy and accurate temperature
readings. With the non-contact (IR) and contact (TK) technology,
they can be used to measure the surface temperature of
hard-to-reach objects like electrified equipment or moving objects,
without any damage to them.

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2. Features
◆Fast and easy measurement
◆Precise IR and TK temperature measurement
◆Built-in laser pointers increase the target accuracy
◆Adjustable emissivity: 0.1～1.0
◆ºC/ºF selection
◆MAX, MIN, DIF, AVG record
◆REC datalogger function for 12 points
◆LCD display with backlight
◆Resolution 0.1℃/℉
◆Trigger lock
◆Adjustable High/Low alarm
◆Automatic range selection
◆Automatic data hold function
◆Automatic power off

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3. Application
This units can be widely used in Food preparation, Safety and Fire
inspection, Plastic molding, Asphalt, Marine, Printing ink, dryer
temperature and Fleet maintenance.
4. Safety
◆Use extreme caution when the laser beam is turned on.
◆Do not point the beam toward human or animal eyes.
◆Do not allow the beam to strike the eye from a reflective surface.
◆Do not use the laser near explosive gases.

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5. Field of View
The meter's field of view is 13:1, for example, if the meter is 13
inches from the target spot, the diameter of the target must be at
least 1 inch. Other distance ratios are show as Fig. 1 in the field of
view diagram.
（Fig: 1 ）

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6. Specifications
Range
IR:-50～500℃/-58～932℉
TK: -50～1370℃/-58～2498℉
Accuracy
IR:-50～0℃/-58～32℉：±4℃/7.2℉
IR:0～500℃/32～932℉：±1.5%±2℃/3.6℉
TK:-50～1370℃/-58～2498℉：±1.5%±1℃/1.8℉
D:S
13:1
Emissivity
Adjustable: 0.10～1.0
Resolution
0.1℃(0.1℉)﹤1000 ，1℃(1℉)﹥1000
Response Time
﹤250 ms
Spectral Response
8～14um
Over range indication
LO
HI
Polarity Display
Auto display, "-" indicates negative, while positive
with no sign.
Diode Laser
Output＜1mW，630～670nm, class 2(Ⅱ)
Automatic Power Off
Meter shuts off automatically after 35 seconds
Operating Temp.
0℃～50℃/32℉～122℉
Storage Temp.
-20℃～60℃/-4℉～140℉

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Relative Humidity
Operating：10~95%RH；Storage：＜80%RH
Power Supply
9V battery
Weight
275g
Dimensions(L*W*H)
95*83*192mm
Safety
“ ” Comply with EMC
Notes:
◆Accuracy can be ensured while the temperature is at 18℃～
28℃(64℉～82℉) and humidity is less than 80 % RH.
◆Field of View: Make sure that the target is larger than the unit’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.

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7. Meter Description
①Laser pointer
②IR sensor
③K-type probe interface
④SET button
⑤Measurement trigger
⑥Battery cover
⑦UP/DOWN button
⑧Laser/Backlit button
⑨LCD Display

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8. LCD Display Description
①Measurement Icon
②Emissivity Icon
③Laser Icon
④Backlit Icon
⑤Trigger Lock
⑥℃/℉Icon
⑦DIF Icon
⑧AVG Icon
⑨MIN Icon
⑩Temp. values for the MAX, MIN, DIF,AVG, HAL, LAL. and REC
⑪Low Battery Icon
⑫Low Alarm Set
⑬Low Alarm Icon
⑭High Alarm Icon
⑮High Alarm Set
⑯Type-K temperature Icon
⑰MAX Icon
⑱Data Record Icon
⑲Current temperature value
⑳Data Hold Icon

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9. Operating Instruction
9.1 Operating steps:
①Hold the meter by its handle grip and point it toward the surface
to be measured.
②Pull and hold the Trigger to turn the meter on, the "SCAN" icon
will appear and begin testing.
③The surface temperature being tested will be displayed on the
LCD screen.
④Release the trigger, the "HOLD" icon will appear, and the
reading will be held for several seconds.
⑤The meter will automatically shut off after 35 seconds.
Measurement Note：If the meter used in an ambient temperature
with wide temperature change, awaiting it at least 30 minutes to
adjust it.
The laser is designed for aiming only; it can be shut off while
operating in short distance to save the battery.

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9.2 Button Function
9.2.1 UP/DOWN button
①In Measurement Mode, press button“ ”to switch the
temperature unit ℃or ℉.
②In REC Mode, press button“ ”to review the latest 12 record
readings.
9.2.2 Laser/Backlit button
①In Measurement Mode, press button “ ” to turn on/off laser
pointer, In “HOLD” Mode，press button “ ” to turn on/off
backlight.
②In Measurement Mode, keep pressing button “ ” to select IR
temperature measurement or TK temperature measurement.
9.2.3 SELButton
①After power on the meter, press button“ ”to review REC,
MAX, MIN, DIF, AVG, High/Low Alarm values and TK
measurement.

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②After power on the meter, keep pressing button“ ” until
"”icon flashes on the screen, then loose button“ ”, enter into
Emissivity Mode, press button“ ” to adjust emissivity value,
then keep pressing button“ ” return to the normal measurement
mode. (After entering into Emissivity Mode, momentarily press
button “ ” can set the High/Low alarm value ).
9.2.4 LOCK Button
After power on the meter, lock the
unit on for continuous measurement
by sliding the switch to right LOCK
position. After finish the measurement,
slide the switch to left UNLOCK
position.(After entering into continuous
measurement, the trigger button will
not work.)

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9.3．Battery Replacement
9.3.1 When the low battery icon“ ” appears, replace the
meter's battery.
9.3.2 Open the battery cover, replace the 9V battery and close the
cover.

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10. Notes
10.1 Work Principle
The infrared thermometer is designed for measuring surface
temperature of an object.
The optical sensor can emit, reflect and transmit energy, which
is collected and focused on a detector, then translate it into the
temperature reading by electronics and displayed on the LCD
screen.
The laser is used for aiming the target object only.
10.2 Field of View
The object under test should be larger than the spot size
calculated by the field of view diagram.
The smaller the target object is, the closer the meter should be
to it for accurate measuring.
When accuracy is critical, make sure the target is at least twice
as large as the spot size.
10.3 Distance & Spot Size

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As distance (D) from the object increases, the spot size (S) of
the area measured by the unit becomes larger.
10.4 Locating a hot spot
To find a hot spot, first aim the thermometer to the outside of
target area, then scan across in an up and down motion until the
hot spot is located.
10.5 Notice
Not recommend for measuring shiny or polished metal surfaces
like stainless steel, aluminum, etc.
No not make measurement through transparent surface such as
glass.
If the surface of the object under test is covered with frost, oil,
grime, etc., clean it before taking measurement.
10.6 Maintenance
Do not use volatile liquids to clean the unit, wipe it with dry
soft cloth.
Do not disassemble the unit, repair it by qualified personnel

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Do not immerse it in water.
Do not store it in high temperature or humidity.
10.7 Emissivity
Most (90%) organic materials and painted or oxidized surfaces
have an emissivity of 0.95 (pre-set in the unit).
11. Accessories
①User's Manual
②9V Battery
③Type-K probe
④Hook
⑤Carrying pouch with gift box

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Emissivity Table
Substance
Thermal
emissivity
Substance
Thermal
emissivity
Aluminium
0.30
Glass
0.90 to 0.95
Asphalt
0.95
Iron oxides
0.78 to 0.82
Concrete
0.95
Lacquer
0.80 to 0.95
Leather
0.95
Plastic
0.85 to 0.95
Ceramic
0.95
Paper
0.70 to 0.94
Copper
0.50
Sand
0.90
Brick
0.90
Rubber
0.95
Carbon
0.85
Timber
0.94
Fatlute
0.94
Textiles
0.94
Frozen food
0.90
Lead
0.50
Hot food
0.93
Marble
0.94
Ice
0.98
Cloth(black)
0.98
Snow
0.90
Plaster
0.8 0to 0.90
Human skin
0.98
Water
0.93