TQC ST8839 User manual

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Operating Manual TQC itemcode: TE1006
Infrared thermometer ST8839
ST8839
TQC itemcode TE1006

INTRODUCTION
Thank you for purchase of the 8839/TE1006 IR Thermometer. The
8839/TE1006 is capable of non-contact (infrared) temperature
measurements at the touch of a button. The built-in laser pointer increases
target accuracy while the backlight LCD and handy push-buttons combine
for convenient, ergonomic operation.
The Non-contact Infrared Thermometers can be used to measure the
temperature of objects’ surface that is improper to be measured by
traditional (contact) thermometer (such as moving object, the surface with
electricity current or the objects which are uneasy to be touched.)
Proper use and care of this meter will provide years of reliable service.
FEATURES:
zPrecise non-contact measurements
zHigh distance to target ratio measures smaller surface areas at
greater distances
zWidest temperature range
zUnique flat surface, modern housing design
zBuilt-in laser pointer
zAutomatic Data Hold
z/ switch
zEmissivity digitally adjustable from 0.10 to 1.0
zMAX,MIN,DIF, AVG temperature displays
zBacklight LCD display
zBuilt-in laser pointer
zAutomatic selection range and Display Resolution 0.1ºC(0.1ºF)
zTrigger lock
zSet high and low alarms
WIDE RANGE APPLICATION:
Food preparation, Safety and Fire inspectors, Plastic molding, Asphalt,
Marine and Screen printing, measure ink and Dryer temperature, HVAC/R,
Diesel and Fleet maintenance.
1. SAFETY
zUse extreme caution when the laser beam is turned on.
zDo not let the beam enter your eye, another person’s eye or the eye of
an animal.
zBe careful no to let the beam on a reflective surface strike your eye.
zDo not allow the laser light beam impinge on any gas which can
explode.
2 Distance & Spot Size
As the distance (D) from the object increases, the spot size (S) of the area
measured by the unit 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
3.SPECIFICATIONS
Model Temperaturerange D:S
ST-8839 -50 to 1000℃(-58 to 1832℉) 50:1
Displayresolution 0.1℃(0.1℉)
Accuracy fortargets:
Assumes ambient operating temperature of 23 to 25℃(73 to 77℉)
-50 to -20℃(-58 to -4℉): ±5℃(±9℉)
-20 to 200℃(-4 to 392℉): ± 1.5% of reading + 2℃(±3.6℉);
200 to 538℃(392 to 1000℉): ± 2.0% of reading +2℃(±3.6℉);
538 to 1000℃(1000 to 1832℉): ± 3.5% of reading ± 5℃(±9℉)
Response time Less than 1 second
Spectral response 8~14um
Emissivity Digitally adjustable from 0.10 to 1.0
Over range indication LCD will show “-0L”,”0L”
Polarity Automatic (no indication for positive polarity);
Minus (-) sign for negative polarity
Diode laser Output <1mW,Wavelength 630~670nm,
Class2(II)laserproduct
Operating temp. 0 to 50℃(32 to 122℉)
Storage temp. –20 to 60℃(-4 to 140℉)
Relative humidity 10%~90%RH operating, <80%RH storage
Power supply 9V battery, NEDA 1604A or IEC 6LR61,
or equivalent
Weight 290g (10.2 oz.)
Size 100 x 56 x 230mm (3.9 x 2.2 x 9.0”)
Safety “CE”ComplywithEMC
Note:
zAccuracy: Given at 18 to 28℃(64 to 82 ℉), less than 80 % RH.
zField 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.

4.FRONT PANEL DESCRIPTION
1) IRsensor
2) Laser pointer beam
3) LCD Display
4) Down button
5) Up button
6) Mode button
7) Laser/Backlight button
8) Measurement Trigger
9) Handle Grip
10) Battery Cover
5.INDICATOR
1) Data hold
2) Measuring indication
3) Emissivity symbol and value
4) Low battery, lock and laser “ON”
symbols
5) Backlight “ON” symbol
6) oC / oF symbol
7) High alarm and low alarm symbol
8) Temperature values for the MAX, MIN, DIF, AVG HAL and LAL.
9) Symbols for EMS, MAX, MIN, DIF, AVG, HAL and LAL.
10) Current temperature value
6.BUTTONS
1) Up button (for EMS,HAL,LAL)
2) MODE button
(for cycling through the mode loop)
3) Down button (for EMS,HAL,LAL)
4) Laser/Backlight ON/OFF button
(pull trigger and press button to activate
laser/backlight)
MODE Button Function
The infrared thermometer measures
Maximum (MAX), Minimum (MIN),
Differential (DIF), and Average (AVG)
Temp. Each 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 selected.
Pressing the MODE button also allows
you to access the High Alarm(HAL),Low
Alarm(LAL),
Emissivity(EMS).Each time you press
MODE ,you advance through the mode
cycle. The diagram shows
the sequence of functions in the
MODE cycle.
Switching oC/oF, LOCK ON/OFF and SET ALARM.
① oC/oF
② LOCK ON/OFF
③ SET ALARM
Select the temperature units (oC or oF)
using the oC/oFswitch
To lock the unit on for continuous measurement, slide the middle switch
LOCK ON/OFF right. If the trigger is pulled while the unit is lock on, the laser
and backlight will turn on if they have been activated. When the unit is
locked on, the backlight and laser will remain on unless it is turned off using
the Laser/Backlight button on the keypad.
To activate the alarms, please slide the bottom switch SET ALARM right.
To set values for the High Alarm (HAL), Low Alarm (LAL) and Emissivity
(EMS), firstly active the display by pulling the trigger or press the MODE
button, then press the MODE button until the appropriate code appears in
the lower left corner of the display, press the UP and DOWN buttons to
adjust the desired values.
7.MEASUREMENT OPERATION
1) Hold the meter by its Handle Grip and point it toward the surface to be
measured.
2) Pull and hold the Trigger to turn the meter on and begin testing. The
display will light if the battery is good. Replace the battery if the
display does not light up.
3) While measuring, the SCAN display icon will appear ins the upper left
corner of the LCD.
4) Release the Trigger and the HOLD display icon will appear on the LCD
indicating that the reading is being held.
5) The meter will automatically power down after approximately 7
seconds after the trigger is released.(Unless the unit is locked on)
Note: Measurement considerations
Holding the meter by its handle, point the IR Sensor toward the measure
object. The meter automatically compensates for temperature deviations
from ambient temperature. Keep in mind that it will take up to 30 minutes
to adjust to ambient temperatures. After performing high temperature
measurements, some time (several minutes) is required before new
measurements can be performed. This is a result of the cooling process,
which must take place for the IR sensor.
8.BATTERY REPLACEMENT
1) As battery power is not sufficient, LCD will display “ ”
replacement with one new battery type 9V is required.
2) Open battery cover, then take out the battery from instrument and
replace with a new 9-Volt battery and place the battery cover back.

9. NOTES:
zHow it Works
Infrared thermometers measure the surface temperature 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 temperature reading, which is display n the unit. In
units with a laser, the laser is used for aiming purposes only.
zField 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.
zDistance & Spot Size
As the distance (D) from the object increases, the spot size (S) of the
area measured by the unit becomes larger. See: Fig: 1.
zLocating 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.
zReminders
1) Not recommended for use in measuring shiny or polished metal
surfaces ( stainless steel, aluminum, etc.).See Emissivity
2) The unit cannot measure through transparent surfaces such as glass. It
will measure the surface temperature of the glass instead.
3) Steam, dust, smoke, etc., Can prevent accurate measurement by
obstructing the unit’s optics.
zEmissivity
Emissivity is a 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, cover 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
Substance Thermal emissivity Substance Thermal emissivity
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin
.
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) 0.94
Snow 0.83 Plastic 0.85 to 0.95
Glass 0.90 to 0.95 Timber 0.90
Ceramic to 0.94 Paper 0.70 to 0.94
Marble 0.94 Chromium oxides 0.81
Plaster 0.80 to 0.90 Copper oxides 0.78
Mortar 0.89 to 0.91 Iron oxides 0.78 to 0.82
Brick 0.93 to 0.96 Textiles 0.90
10. MAINTENANCE & CLEANING:
zRepairs or serving aren’t covered in this manual should only be
performed by qualified personnel.
zPeriodically wipe the case with a dry cloth. Don’t use abrasives or
solvents on this instrument.
zWhen serving, use only specified replacement parts.