B&K Precision 635 User Manual
OPERATING INSTRUCTIONS
®
635
INFRARED THERMOMETER
WITH LASER SIGHTING
INTRODUCTION
This instrument is a portable easy to use 3 digit, compactsized digital infrared thermometer with laser sighting designed for simple one hand operation. Meter comes with
Backlit LCD display, Auto-hold function and auto power
down (15 seconds approx.) after releasing MEAS button to
extend battery life.
SAFETY INFORMATION
It is recommended that you read the safety and operation
instructions before using the infrared thermometer.
DANGER
Pressing the button turns the laser beam on and off.
Exercise extreme care and do not allow the laser beam
to enter your eye or those of any other person or animal.
• Do not look directly into the laser light from the optical
system.
• When measuring the temperature of an object which
has a mirror finish, be careful not to allow the laser
light beam to be reflected off the surface into your eyes
or those of another person.
• Do not allow the laser light beam to impinge upon any
gas which can explode.
• Do not use the unit near any device which generates
strong electromagnetic radiation or near a static
electrical charge, as these may cause errors.
• Do not use the unit where it may be exposed to
corrosive or explosive gases. The unit may be damaged, or explosion may occur.
• Do not keep or use this unit in an environment where
it will be directly illuminated by sunshine, or where it
will be exposed to high temperatures, high humidity or
condensation. If you do, it may be deformed, its
insulation may be damaged, or it may no longer
function according to specification.
• Do not point the lens at the sun or at any other source
of strong light. If you do, the sensor may be damaged.
• Do not contact the lens against the object whose
temperature is to be measured, or get it dirty, allow it
to be scratched, or allow any foreign material to
adhere to it. Doing so may cause errors.
• Do not touch or hold by the front cone. Temperature
reading can be affected by heat from hand.
• Do not place the meter on or around hot objects (70°C/
158°F). It may cause damage to the case.
• If the meter is exposed to significant changes in
ambient temperature (hot to cold or cold to hot). Allow
20 minutes for temperature stabilization, before taking measurement.
• Condensation may form on the lens when going from
a cold to hot environment-wait 10 minutes for conden
sation to dissipate before taking measurements.
• This unit is not constructed to be water proof or
dustproof, so do not use it in a very dusty environment
or in one where it will get wet.
CAUTION
SPECIFICATIONS
GENERAL
Display:
3½ digit liquid crystal display (LCD) with maximum
reading of 1999
Low battery indication: the " " is displayed when the
battery voltage drops below the operating level
Measurement rate: 1 times per second, nominal.
Operating Environment: 32°F to 122°F (0°C to 50°C)
at < 80% relative humidity
Storage Temperature: 40°F to 140°F (-20°C to 60°C) ,
0 to 80% R.H. with battery removed from meter
Auto power off: 15 seconds.
Standby consuming current: <20µA
Battery:
Standard 9V battery (NEDA 1604, IEC 6F22)
Battery Life: 100 hours (continuity) typical with carbon-
zinc battery (Laser marker and Back-Light not illuminated)
Dimensions:
170mm(H) x 65.5mm(W) x 35mm(D)
Weight: 195g (including probe and batteries)
Laser Specifications:
Laser safety classification of Class 2
Wave Lenght: Red (630nm~670nm).
Operating Distance: 2 to 50 feet.
Power out: <1mW , class 2 laser product.
ELECTRICAL
Temperature Range: -4°F to 1022°F / -20°C to 550°C
Display Resolution: 1°F , 0.5°C/1°C(Auto)
Accuracy: ±2% of reading or ±6°F/3°C, whichever is
greater @ 64.4 to 82.4°F (@ 18 to 28°C) ambient
operating temperature.
Temperature Coefficient: ±0.2% of reading or ±0.36°F/
0.2°C, whichever is greater, change in accuracy per °F/
°C change in ambient operating temperature above 82.4°F/
28°C or below 64.4°F/18°C.
Response Time: 1 second
Spectral Response: 6 to 14µm nominal
Emissivity: 0.10 to 1.00 by step of 0.01
Detection Element: Thermopile
Optical Lens: Fresnel Lens
Sighting: 1-beam laser marker <1mW (class 2)
Field of View: 100mmØ at 1000mm (3.9"Ø at 39.0")
Spot size increases with distance from the probe tip as shown
(Spot Diameter measured at 90 % Energy)
OPERATING INSTRUCTIONS
Auto Power-down function
If unused for about 15 seconds, the meter will powerdown automatically. Press MEAS button switches to resume
power-on mode.
Turning the Power on
When the power is down, press MEAS less than 1 sec
button to turn on the meter.
The values and settings on the LCD return to what they
were before the power was last turned off.
When the power is down, press MEAS more than 1 sec,
the last record of MAX/MIN was erased.
Display Back-Light Button
Press " " button to turn on or off the LCD Back-Light
during measurement, or while the display shows HOLD,
MAX or MIN.
Laser Sighting
Press " " button to on the " " annunciator. If " "
annunciator is on, press MEAS button and the laser beam
will turn on and " " annunciator will blink. Releasing
MEAS button turns off the laser beam.
Selecting the Temperature Scale (°C or °F)
Readings are displayed in either degrees Celsius(°C) or
degrees Fahrenheit(°F). When the thermometer is turned
on, it is set to the temperature scale that was in use when the
thermometer was last turned off. To change the temperature
scale, in power down mode hold the " " button (°F) [" "
button (°C)] down, and then press MEAS button until the °F
(°C) annunciator appear.
Continuous Measurement
1. In the power down mode, holding the MODE key down
and then pressing the MEAS key will put the meter into
the continuous measurement mode, if HOLD was show,
please press MEAS button again to into the continuous
measurement.
2. When the MEAS key is pressed again to stop measuring
temperature and automatically hold the display reading,
the meter power down automatically after 15 seconds.
NOTE: During the continuous measurement mode, the
HOLD indication does not appear.
NOTE: During the continuous measurement mode, the laser
sighting is not turned on.
MODE SELECTION AND OPERATION
Press MODE button switches the mode around the cycle ε
→ ALM Hi → ALM Lo → MAX → MIN → HOLD.
HOLD :Releasing MEAS button stops measuring tem-
perature, the HOLD indication appears, and the
measured temperature is held.
ε:The thermal emissivity of the object set using
the ▲ and ▼ keys.
ALM Hi :The upper limit alarm temperature is set using
the ▲ and ▼ keys. When the measured temperature is exceeded the Hi setpoint, the beeper
emits a discontinuous pulse tone and "ALM Hi"
is displayed.
ALM Lo :The lower limit alarm temperature is set using
the ▲ and ▼ keys. When the measured temperature is blew the Lo setpoint, the beeper
emits a continuous pulse tone and "ALM Lo" is
displayed.
MAX :The maximum temperature during measure-
ment is displayed. when measuring and also
pressing the mode key, this will enter MAX/
MIN/Present cycling.
MIN :The minimum temperature during measure-
ment is displayed. when measuringand also
pressing the mode key, this will enter MAX/
MIN/Present cycling.
NOTE: when the power is down, press the MEAS key more
than 1 sec the last record of MAX/MIN was erased.
SET MODE & Numeric input key
"SET" annunciator appears when a numerical value can
be set ( during setting of ε, ALM Hi and ALM Lo).
▲ key :The numerical value is increased.
▼ key :The numerical value is reduced.
If either of these numerical value keys is held down, the
numerical value changes rapidly in the appropriate
direction.
The data will store in nonvolatile storage region while
after completing settings will store in volatile storage.
How to specify the thermal emissivity (
1. Stick black body tape on the object whose temperature is
to be measured, or spray it with black body spray.
2. Set the thermal emissivity value (ε) on the LCD to 0.95.
3. Press the MEAS key, so as to measure the temperature
(Treal) of the part on which body tape (or black body spray)
is applied.
4. Measure the temperature (T) of the parts to which body
tape (or black body spray) is not applied.
5. Change the thermal emissivity value (ε).
6. The value of the thermal emissivity (ε) at which T comes
out to be equal to Treal is the correct value for the inherent
thermal emissivity of the body whose temperature is to be
measured.
ε ) ε )
ε )
ε ) ε )
OPERATION
1. When the power is down, pressing MEAS button turns on
the power.
2. Use " " button to select turn on or turn off the display
Back-Light.
3. Use " " button to select turn on or turn off the Laser
beam.
4. Press the MODE button, if necessary to set the thermal
emissivity value (ε).
5. Point the lens at the object whose temperature is to be
measured.
6. Press the MEAS button. Measurement is performed as
long as the MEAS button is kept pressed.
7. Referring to the spot size figure, aim the laser beam at the
object whose temperature is to be measured.
NOTE: Although the field of measurement (or Field of
View) and the spot almost coincide, actually the
field of measurement corresponds to the diameter for 90% optical response. The object whose
temperature is to be measured needs to be larger
than the measurement diameter (spot of size) by
an adequate margin at least 1.5 to 2 times larger.
8. Read the display.
MEASUREMENT CONSIDERATIONS
1. Theory of Measurement
Every object emits infrared energy in accordance with its
temperature. By measuring the amount of this radiant
energy, it is possible to determine the temperature of the
emitting object.
2. About Infrared
Infrared radiation is a form of light (electromagnetic
radiation), and has the property that it passes easily
through air while it is easily absorbed by solid matter.
With an emission thermometer which operates by detecting infrared radiation accurate measurement is possible,
irrespective of the air temperature or the measurement
distance.
3. Emission Thermometer Structure
Infrared radiation which has been emitted from the object
is focused upon an infrared radiation sensor, via an optical
system. This includes a lens which is transparent to
infrared radiation, and 5.3µm cut off filter. The output
signal from the infrared radiation sensor is input to an
electronic circuit along with the output signal from a
standard temperature sensor (Thermopile).
4. Emissivity
All objects emit invisible infrared energy. The amount of
energy emitted is proportional to the object's temperature
and its ability to emit IR energy. This ability, called
emissivity, is based upon the material that the object is
made of and its surface finish. Emissivity values range
from 0.10 for a very reflective object to 1.00 for a black
body. Factory set emissivity value of 0.95, which cover
90% of typical applications.
5. If the surface to the measured is covered by frost or other
material, clean it to expose the surface.
6. If the surface to be measured is highly reflective, apply
masking tape or matt finish black paint to the surface.
7. If the meter seems to be giving incorrect readings check
the front cone. There may be condensation or debris
obstructing the sensor; clean per instructions in the
maintenance section.
MAINTENANCE
Battery Replacement
Power is supplied by a 9 volt "transistor" battery. (NEDA
1604, IEC 6F22). The " " appears on the LCD display
when replacement is needed. To replace the battery, remove
the two screws from the back of the meter and lift off the
battery cover. Remove the battery from battery contacts.
Cleaning
Periodically wipe the case with a damp cloth and detergent, do not use abrasives or solvents.
Substance Thermal Substance Thermal
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Lather 0.75 to 0.80
Sand 0.90
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 0.90 to 0.94 Paper 0.70 to 0.94
Marble 0.94
Plaster 0.80 to 0.90 Copper oxides 0.78
Mortar 0.89 to 0.91 lron oxides 0.78 to 0.82
Brick (red) 0.93 to 0.96 Textiles 0.90
emissivity emissivity
Charcoal (powder)
chromium oxides
0.96
0.81
CAUTION
Laser radiation is emitted from the APERTURE
AVOID EXPOSURE
LASER RADIA TION DO NO T ST ARE INT O BEAM
SEMICONDUCTOR LASER 630nm - 670nm
MAX. 1mW CLASS 2 LASER PRODUCT
EN 60825-1:1994/A11:1996/A2:2001
MADE IN TAIWAN
LIMITED ONE YEAR WARRANTY
BK PRECISION warrants to the original purchaser that
its product, and the component parts thereof, will be free
from defects in workmanship and materials for a period of
one year from the date of purchase.
BK PRECISION will, without charge, repair or replace,
at its option, defective product or component parts upon
delivery to an authorized BK PRECISION service contractor or to the factory service department, accompanied by
proof of the purchase date in the form of a sales receipt.
Exclusions: This warranty does not apply in the event of
misuse or abuse of the product or as a result of unauthorized
alterations or repairs. It is void if the serial number is altered
, defaced or removed.
BK PRECISION shall not be liable for any consequential
damages, including without limitation damages resulting
from loss of use. Some states do not allow limitation of
incidental or consequential damages, so the above limitation
or exclusion may not apply to you.
This warranty gives you specific rights and you may have
other rights which vary from state-to-state.
For your convenience, we suggest you contact your BK
PRECISION distributor, who may be authorized to make
repairs or can refer you to the nearest service contractor.
If warranty cannot be obtained locally, please send the unit
to BK PRECISION Service Department, 22820 Savi
Ranch Parkway Yorba Linda, CA 92887, properly packaged to avoid damage in shipment.
BK PRECISION Test Instruments only warrants products sold in the U.S.A. and its overseas territories. In other
countries each distributor warrants the BK PRECISION
products which it sells.
CUSTOMER SUPPORT 1-800-462-9832
Precision offers courteous, professional technical support
before and after the sale of their test instruments. The
following services are typical of those available from our
toll-free telephone number:
• Technical advice on the use of your instrument.
• Technical advice on special applications of your
instrument.
• Technical advice on selecting the best instrument for a
given task.
• Instrument for information on optional accessories for
your instrument.
• Information on instrument repair and recalibration
services.
• Replacement parts ordering.
• Information on other BK PRECISION instruments.
• Requests for a new BK PRECISION catalog.
• The name of your nearest BK PRECISION distributor.
Call toll-free 1-800-462-9832
Monday through Friday, 8:00 A.M. to 5:00 P.M.
Pacific Standard Time
®
22820 Savi Ranch Parkway Yorba Linda, CA 92887
© 2000 BK PRECISION
481-310-9-001 Printed in Taiwan
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