CEM DT-8861 User manual

Non-Contact Infrared Thermometers
Operating Manual
3p
04/07-61

TABLE OF CONTENTS
INTRODUCTION………………………………………3
FEATURES……………………………………………3
WIDERANGEAPPLICATION ………………………… 4
SAFETY……………………………………………… 4
DISTANCE&SPOTSIZE……………………………… 5
SPECIFICATIONS…………………………………… 6
FRONTPANELDESCRIPTION……………………… 8
INDICATOR……………………………………………8
BUTTONS………………………………………………9
MEASURMENTOPERATION………………………… 10
BATTERYREPLACEMENT…………………………… 13
NOTES……………………………………………… 13
MAINTENANCE …………………………………… 17
2

INTRODUCTION
Thank you for purchase of the IR Thermometer. This 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:
zRapid detection function
zPrecise non-contact measurements
zDual laser sighting
zUnique flat surface, modern housing design
zAutomatic Data Hold
z℃/℉switch
zEmissivity Digitally adjustable from 0.10 to 1.0
3

zMAX temperature displays
zBacklight LCD display
zAutomatic selection range and Display Resolution 0.1º
C(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.
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.
4

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.
D:S= 12:1
D
S
12in.1in @
6in.
0.5in @
25mm @300mm
150mm
12.5mm @
1. SPECIFICATIONS
Temperature range D: S
-50to550
oC(-58℉~ 1022℉) 12:1
Display resolution 0.1 oC(0.1℉) <1000
1℉>1000
Accuracy fortargets:
5

Assumes ambient operating temperature of 23 to 25 oC (73
to 77℉)
-50 ~ 20℃(-58℉~ 68℉) ±2.5℃(4.5℉)
20℃~300℃(68℉ ~572℉) ±1.0% ±1.0℃(1.8℉)
300℃~550℃(572℉ ~1022℉) ±1.5%
Repeatability
-50~20℃(-58~68℉) : ±1.3℃(2.3℉)
20~550℃(68~1022℉): ±0.5% or ±0.5℃(0.9℉)
Response time 150ms
Spectral response 8~14um
Emissivity Digitally adjustable from 0.10 to 1.0
Over range indication LCD will show “----”
Polarity Automatic (no indication for positive polarity);
Minus (-) sign for negative polarity
Diode laser output <1mW,Wavelength 630~670nm,
Class2laser product
Operatingtemp. 0to50℃(32 to 122℉)
Storage temp. –10 to 60℃(14 to 140℉)
Relative humidity 10%~90%RH operating,
<80%RH storage
Power supply 9V battery, NEDA 1604A or IEC 6LR61,
or equivalent
6

Safety “CE”ComplywithEMC
Note:
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.
2. FRONT PANEL DESCRIPTION
① IRsensor
②LCD Display Laser
pointer beam
③up button
④down button
⑤ mode button
⑥ Measurement Trigger
⑦ Battery Cover
⑧ Handle Grip
3. INDICATOR
① Data hold
② Laser ” on” symbols
③ Lock symbol
7

④ High alarm and low alarm symbol
⑤ ℃/℉symbol
⑥ Low power symbols
⑦ Emissivity symbol and value
⑧ Temperature values for the MAX
⑨ Symbols for MAX
⑩ Current temperature value
4. Buttons
① Up button (for EMS,HAL,LAL)
② Down button (for EMS,HAL,LAL)
③ MODE button
(for cycling through the
mode loop)
Functional Design
1. the switches of C/F sat in a cell switching
2. In the measuring time up, down keys to adjust the
Emissivity.
3.IN the hold time, up keys to turn on or off the laser
Down keys to turn on or off the backlight
4. To set values for the High Alarm (HAL), Low Alarm (LAL)
and Emissivity (EMS), press the MODE button until the
8

appropriate code appears in the display, press the UP and
down buttons to adjust the desired values.
MODE Button Function
Press the mode button
also allows you to access
the set
state,Emissivity(EMS),Lo
ck on/off,HAL on/off, HAL
adjustment LOW
on/off,LOW
adjustment,Each time you
press set you advance
through the mode cycle.
The diagram shows the
sequence of functions in
the mode cycle.
EMS adjustment. The
Emissivity(EMS) digitally
adjustable from 0.10 to 1.0, LOCK on/off. The lock mode
is particularly useful for continuous monitoring of
temperatures. Press the up button or down button to
LOCK on/off
HAL on/off
HAL adjustment
LOW on/off
LOW adjustment
EMS adjustment
9

turn on or off . Press the Measurement Trigger to
confirm the lock measurement mode. The IR
Thermometer will continuously display the temperaure
until press again the Measurement Trigger.
In lock mode, press the up button or down button
adjustable the Emissivity.HAL (LOW) on/off. Press
the up button or down button to turn on or turn off.
Press the Measurement Trigger to confirm the
High(Low)alarm mode.Hal(LOW) adjustment. The
high(Low) alarm adjustable form
-50to550
oC(-58℉~ 1022℉)
Switching C/F
Select the temperature units (oC or oF)
using the oC/oFswitch ( ① )
Max indicate the max record that
displays between the pressing and releasing the "ON/OFF"
MEAS
button each time
UREMENT OPERATION
10

① Hold the meter by its Handle Grip and point it
② P
Replace the battery if the display does not
ress the DOWN button to
e trigger is
released.(Unless the unit is locked on)
Not
toward the surface to be measured.
ull and hold the Trigger to turn the meter on and
begin testing. The display will light if the battery is
good.
light.
③ Release the Trigger and the HOLD display icon
will appear on the LCD indicating that the reading is
being held. In HOLD status, press the UP button to
turn on or off the laser. And p
turn on or off the backlight.
④The meter will automatically power down after
approximately 7 seconds after th
e: Measurement considerations
Holding the 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 that
it will take up to 30 minutes to adjust to wide ambient
temperatures are to be measured followed by high
11

temperature measurements, some time (several
minutes) is required after the low (and before the high)
oling process, which must take
lace for the IR sensor.
5.
battery type 9V is
9-Volt battery and place the battery cover
back.
z
temperature measurements are made.
This is a result of the co
p
BATTERY REPLACEMENT
①As battery power is not
sufficient, LCD will display
“ ” replacement with
one new
required.
②Open battery cover,
then take out the battery from instrument and replace
with a new
6. NOTES:
How it Works
Infrared thermometers measure the surface
temperature of an object. The unit’s optics sense
emitted, reflected, and transmitted energy, which is
12

collected and focused onto a detector. The unit’s
electronics translate the information into a temperature
reading, which is display on the unit. In units with a
is used for aiming purposes only.
z
re the target is at
e spot size.
z
a measured by the unit becomes
z
ith an up and down
ou locate hot spot.
z
①
es ( stainless steel, aluminum,
②
laser, the laser
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 su
least twice as large as th
Distance & Spot Size
As the distance (D) from the object increases, the spot
size (S) of the are
larger. See: Fig: 1.
Locating a hot Spot
To find a hot spot aim the thermometer outside the area
of interest, then scan across w
motion until y
Reminders
Not recommended for use in measuring shiny or
polished metal surfac
etc.).See Emissivity
The unit cannot measure through transparent surfaces
13

such as glass. It will measure the surface temperature of
ent accurate
ng the unit’s optics.
z
ribe the
asure the temperature of the tape or
ainted surface.
the glass instead.
③ Steam, dust, smoke, etc., Can prev
measurement by obstructi
Emissivity
Emissivity is a term used to desc
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. Me
p
14

Emissivity Va
Substance Substance
ivity
lues
Thermal
emissivity
Thermal
emiss
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement o 0.800.96 Lather 0.75 t
Sand 0.90 0.96Charcoal
(powder)
Earth 0.92 to 0.96 Lacquer o 0.950.80 t
Water 0.92 to 0.96 r 0.97Lacque
(matt)
Ice 0.96 to 0.98 0.94Rubber
(black)
Snow 0.83 Plastic 0.85 to 0.95
Glass 0.90 to 0.95 Timber 0.90
Ceramic o 0.94 0.940.90 t Paper 0.70 to
Marble 0.94 m 0.81Chromiu
oxides
Plaster 0.80 to 0.90 0.78Copper
oxides
Mortar 0.89 to 0.91 Iron oxides o 0.820.78 t
Brick 0.93 to 0.96 Textiles 0.90
15

16
be carried out by qualified trained
. Do not use
ified parts.
7. MAINTENANCE
zRepairs or service are not covered in this manual and
should only
technician.
zPeriodically, wipe the body with a dry cloth
abrasives or solvents on this instrument.
zFor service, use only manufacturer’s spec