●Wide Range 0.1〜199900 lux
●Automatic Zero Adjust function
●Large LCD Display with Backlight
3. Name of Parts and Position/Operation
This is used to protect the
photocell from scratching and
c r e a t e c o m p l e t e d a r k
environment for the meter to
p e r f o r m d a r k c u r r e n t
Light Sensing Probe/Photocell
Push this button to turn on the
meter. Please push the button
again to turn it off. The unit will
auto matica lly turn itself off
af ter 30 mi nute s if no key
operat ion. To disable the
automatic power off function,
turn the meter off, push and
keep holding button, then push power button to turn on.
Push this button to turn on and off the LCD backlight. The backlight will
be automatically off after 30 seconds to save battery power.
The user may hold the present and keep it on the LCD display by
Push this button to set the meter working under MAX/MIN mode. By
pushing this button, the user may swap the LCD reading among current,
maximum and minimum reading. Push and hold this key for 3 seconds
The user may use this button to select the preferred measuring or
automatically selected by the meter. The available ranges are: AUTO
200, 2000, 20000, 200000 lx
⑨０ ADJ button （Please refer to Measurement）
This instruction manual contains warnings and safety rules which must be
observed by the user to ensure safe operation of the instrument and to
retain it in safe condition.
● Read through and understand instructions contained in this manual
before starting using the instrument.
● Save and keep the manual handy to enable quick reference whenever
The symbol indicated on the instrument means that the user must refer #
to related parts of the manual for safe operation of the instrument. Be sure
to carefully read the instructions following each symbol in this manual.#
# DANGER ： is reserved for conditions and actions that are likely to
cause serious or fatal injury.
# WARNING： is reserved for conditions and actions that can cause
# CAUTION ： is reserved for conditions and actions that can cause
minor injury or instrument damage.
● Do not install substitute parts or make any modification to the
instrument. Return the instrument to Kyoritsu or your distributor for
repair or re-calibration.
● Do not expose the instrument to the direct sun, extreme temperatures
This instrument isn't dust & water proofed. Keep away from dust and water.
● Be sure to set the Function Selector Switch to the "OFF" position after
use. When the instrument will not be used for a long period of time,
place it in storage after removing the batteries.
● Use a damp cloth and detergent for cleaning the instrument. Do not
use abrasives or solvents.
● The instrument should be calibrated once a year or so for the accurate
This symbol is marked where the user must refer to the
instruction manual so as not to cause personal injury or
This instrument satisfies the marking requirement defined in the
WEEE Directive. This symbol indicates separate collection for
electrical and electronic equipment.
When battery capacity segment is less
than one, the user should replace the
bat ter y. The batter y cabi net c an be
opened with a screw driver and two AA
type batteries should be installed.
Light detector Silicon photo diode
Measuring Range 0.0〜199,900 lx
Range 199.9/1,999/19,990/199,900 lx
Accuracy ±4%rdg±5dgt（23℃±2℃）
Angle deviation from cosine
Temperature characteristics
±5 % (at 23 reference and a range of 0 to 40℃ ℃)
Relative spectral sensitivity
Deviation from spectral luminous
Communication Bluetooth Ver.5.0
Dimensions 169(L)x63(W)x37(D)mm
Power source R6(AA)(1.5V) x 2
0℃〜40℃,80%RH or less（without
-10℃〜60℃,70%RH or less（without
Continuous measuring time Approx. 80 hours
Please perform zero adjustment before measurement.
Press 0 ADJ button with the Lens Protecting Cover attached to the Light
"CAP-" will auto-appear on the LCD display. After "CAL-" appears, the
meter enters the automatic zero adjustment. When automatic zero
adjustment is completed, "CAL-" disappears and "0.0"appears. After
confirming the "0.0" display, remove the cap to start measuring.
If ERR1 appears, check the cap to make sure it is on properly.
After the measurement has been completed, press the power button
again to turn off the power, and cover the light-detecting surface with
the cap for protecting against stray light.
Place the light sensing probe parallel to the measuring object and
measure it. At this time, please be careful that your own shadow does
not hit the sensing probe.
The li ght sensin g probe can be f ixed on the meter parallel or
perpendicular to the LCD Display. Or it may be detached from the unit to
fit the measuring requirement.
6. Bluetooth communication
6-1 Bluetooth communication
KEW 5204BT has a Bluetooth communication function and can exchange
data with Android/ iOS tablet devices. Before starting to use this function,
download the special applicationKEW Smart＊via the internet.
Some functions are available only while connected to the internet. For
further detail, please refer to 6-2. KEW Smart ＊.
Radio waves at Bluetooth communication may affect the operations of
medical electronic devices. Special care should be taken when using
Bluetooth connection in the areas where such devices are present.
● Using the instrument or tablet devices near wireless LAN devices (IEE
E802.11.b/g) may cause radio interferences, lowering of communication
speed, resulting in significant time lag in the display update rate
between the instrument and tablet device. In this case, keep the
instrument and the tablet device away from the wireless LAN devices,
or turn off the wireless LAN devices, or shorten the distance between
the instrument and the tablet device.
● It may be difficult to establish communication connection if either the
instrument or tablet device is in a metal box. In such a case, change the
measurement location or remove the metal obstacle between the
instrument and the tablet device.
● If any leaki ng of da ta or infor mat ion occur s whi le ma king a
communication using Bluetooth function, we assume no responsibility
for any released content.
● Some tablet devices, even if the application runs properly, may fail to
establish communication with the instrument. Please use another tablet
device and try to communicate with. If you still cannot confirm the
connection, there may be some problem with the instrument unit.
Please contact your local KYORITSU distributor.
● The Bluetooth word mark and logos are owned by Bluetooth SIG, Inc.
and we, KYORITSU, are licensed by them for use.
● Android, Google Play Store, and Google Map are the trademark or
registered trade mark of Google Inc.
● iOS is the trademark or registered trade mark of Cisco.
● Apple Store is the service mark of Apple Inc.
● In this manual, the TM and®marks are omitted.
The special applicationKEW Smart＊is available on download site for
free. (An Internet access is required.) Please note that communication
charge is incurred separately for downloading applications and using
special features of them. For your information,KEW Smart＊is provided
● Remote monitoring/ checking
● Data save/ recall function
The GPS imfomation at the time of measurement is added to the
measurement data using the location information service.
Measured result can be saved with comments.
The latest information aboutKEW Smart＊can be checked with the site
on Google Play Store or App Store.
Kyoritsu reserves the rights to change specifications or designs described
in this manual without notice and without obligations.
