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Operation, Measurement considerations, Maintenance – B&K Precision 635 - Manual User Manual

Page 2: Customer support, Limited one year warranty

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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 (

ε )

ε )

ε )

ε )

ε )

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

(T

real

) 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 T

real

is the correct value for the inherent

thermal emissivity of the body whose temperature is to be
measured.

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 diam-
eter 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 detect-
ing 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 5.3

µ

m 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 deter-

gent, do not use abrasives or solvents.

Substance

Thermal

Substance

Thermal

emissivity

emissivity

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

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

0.90 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

lron oxides

0.78 to 0.82

Brick (red)

0.93 to 0.96

Textiles

0.90

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 pack-
aged to avoid damage in shipment.

BK PRECISION

Test Instruments only warrants prod-

ucts 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

®

MADE IN TAIWAN

Laser radiation is emitted from the APERTURE

CAUTION

AVOID EXPOSURE

LASER RADIATION DO NOT STARE INTO BEAM
SEMICONDUCTOR LASER 630nm - 670nm
MAX. 1mW CLASS 2 LASER PRODUCT
EN 60825-1:1994/A11:1996/A2:2001

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 con-
tractor 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.