BJ Series
Compact and Long sensing distance
Features
Long distance sensing type
● Long sensing distance with high quality lens
● Long sensing distance
: Through-beam type 15m, Diffuse reflective type 1m,
Polarized retroreflective type 3m(MS-2A)
● M.S.R.(Mirror Surface Rejection) function
(Polarized retroreflective type)
● Compact size: W20×H32×L10.6mm
● Protection structure IP65/IP67(IEC standard)
● Light ON/Dark ON selectable by VR
● Sensitivity adjustment VR incorporated
● Built-in reverse power polarity, output short,
overcurrent protection circuit
● Mutual interference prevention function
(Except through-beam type)
● Improved noise resistance and minimize effect of
disturbance light
(MS-2A)
Connector type
Please read “Caution for your safety” in operation
manual before using.
Specifications
※The model name with ‘-C’ is connector type.
Long distance sensing type
BJ15M-TDT
BJ10M-TDT
BJ15M-TDT-C BJ10M-TDT-C BJ7M-TDT
BJ15M-TDT-P BJ10M-TDT-P BJ7M-TDT-P
BJ15M-TDT-C-P BJ10M-TDT-C-P
Sensing type
Through-beam
Model
Type
NPN open
collector output
PNP open
collector output
Sensing distance
15m
10m
Sensing target
Opaque material over ø12mm
7m
BJ3M-PDT
BJ3M-PDT-C
BJ3M-PDT-P
BJ3M-PDT-C-P
Polarized
retroreflective
※1
0.1 to 3m
(MS-2A)
BJ1M-DDT
BJ1M-DDT-C
BJ1M-DDT-P
BJ1M-DDT-C-P
BJ300-DDT
BJ300-DDT-C
BJ300-DDT-P
BJ300-DDT-C-P
BJ100-DDT
BJ100-DDT-C
BJ100-DDT-P
BJ100-DDT-C-P
Diffuse reflective
300mm
100mm
1m
(Non-glossy white (Non-glossy white (Non-glossy white
paper 300×300mm) paper 100×100mm) paper 100×100mm)
Opaque material Opaque material Translucent, opaque materials
over ø8mm over ø75mm
Max. 20% at sensing distance
Max. 1ms
12-24VDC±10%(Ripple P-P: Max.10%)
Emitter/Receiver: Max. 20mA
Max. 30mA
Infrared LED
Red LED
Red LED
Red LED
Infrared LED Red LED
Infrared LED
Light source
(850nm)
(660nm)
(650nm)
(660nm)
(850nm)
(660nm)
(850nm)
Sensitivity adjustment
Built-in the adjustment VR
Operation mode
Light on/Dark on selectable by VR
NPN or PNP open collector output
Control output
●Load voltage: Max. 26.4VDC ●Load current: Max. 100mA ●Residual voltage - NPN: Max. 1V, PNP: Max. 2.5V
Protection circuit
Reverse polarity protection, output short-circuit protection, interference prevention function(Except through-beam type)
Indicator
Operation: Red, Stable: Green(Emitter’s power indicator: Green)
Insulation resistance
Max.20MΩ(at 500VDC megger)
Noise resistance
±240V the square wave noise(pulse width:1㎲) by the noise simulator
Dielectric strength
1000VAC 50/60Hz for 1minute
Vibration
1.5mm amplitude or 300m/s2 at frequency of 10 to 55Hz(for 1 min.) in each of X, Y, Z directions for 2 hours
Shock
500m/s2(approx. 50G) in each of X, Y, Z directions for 3 times
Ambient illumination Sunlight: Max. 11,000lx, Incandescent lamp: Max. 3,000lx(Receiver illumination)
Ambient temperature -25 to 55℃, storage: -40 to 70℃
Ambient humidity
35 to 85%RH, storage: 35 to 85%RH
Protection
BJ - IP65(IEC standard), BJ-C - IP67(at non-dew status)
Material
Case: PC+ABS, LED Cap: PC, Sensing part: PMMA
※2
BJ: ø3.5, 3-wire, Length: 2m(Emitter of through-beam type: ø3.5, 2-wire, Length: 2m)
Cable
(AWG24, Core diameter: 0.08mm, Number of cores: 40, Insulator out diameter: ø1)
Common
Mounting bracket, Bolt, Nut, VR adjustment driver
Accessory
Reflector(MS-2A) Individual
Approval
BJ: Approx 60g BJ: Approx. 45g, BJ-C: Approx. 10g
Unit weight
BJ: Approx. 90g, BJ-C: Approx. 20g
BJ-C: Approx 30g
Environment
Hysteresis
Response time
Power supply
Current consumption
※1: The sensing distance is extended to 0.1 to 4m or 0.1 to 5m when using optional reflector MS-2S or MS-3S.
※2: M8 connector cable is sold separately. (Cable - AWG22, Core diameter: 0.08mm, Number of cores: 60, Insulator out diameter: ø1.25)
※The temperature or humidity mentioned in Environment indicates a non freezing or condensation environment.
A-12
Long sensing distance/BGS reflective/Micro spot type
Transparent glass sensing/BGS reflective/Micro spot type
(A)
Photo
electric
sensor
Features
BGS reflective type
● Adopts BGS method superior than convergent reflective
to minimize error by background, or color, material of
sensing object for stable sensing by adjusting the volume
● Visible light source to check the position of sensing spot and small spot
minimizing effect of the ambient objects with narrow sensing width
Transparent glass sensing type / Micro spot type
● Stable sensing for transparent object(LCD, PDP, glass etc)
by BJG30-DDT
● Easy to check sensing location with visible micro spot(BJN Series)
● Detects tiny objects (min. sensing target Ø0.2mm copper wire)
Commonness
● Compact size: W20×H32×L10.6mm
● Protection structure IP65(IEC standard)
● Light ON/Dark ON selectable by VR(Except BJG30-DDT)
● Sensitivity adjustment VR incorporated(Except BJG3 DDT)
● Built-in reverse power polarity, output short, overcurrent protection circuit
● Mutual interference prevention function(Except BGS reflective type)
● Improved noise resistance and minimized effect of disturbance light
Please read “Caution for your safety” in operation
manual before using.
Specifications
BGS reflective type
BJ30-BDT
BJ50-BDT
BJ30-BDT-P BJ50-BDT-P
BGS reflective
10 to 30mm
10 to 50mm
(Non-glossy
(Non-glossy
white paper
white paper
50×50mm)
50×50mm)
Min.diameter of
transmitting SPOT
Min.sensing target
-
Approx.
ø5.0mm
Hysteresis
Max. 20% at sensing distance
Sensing distance
Sensing target
Transparent glass
sensing type
BGS reflective
type
(Spot size)
Ø5.0/4.5/6.5mm
Max. 10% at sensing distance
(E)
Pressure
sensor
(G)
Connector/
Socket
Micro spot type
※Spot is visible with bare eyes
while beam(line) is not.
Micro spot type
BJ100-BDT
BJN50-NDT
BJN100-NDT
BJ100-BDT-P BJN50-NDT-P BJN100-NDT-P
Narrow beam reflective
10 to 100mm
(Non-glossy
30 to 70mm
70 to 130mm
white paper
100×100mm)
Translucent, opaque materials
Approx.
ø4.5mm
(D)
Proximity
sensor
(F)
Rotary
encoder
Translucent, opaque materials
Approx.
ø6.5mm
Approx.
Approx.
ø2.0mm
ø2.5mm
Approx. min. ø0.2mm(Copper wire)
Max. 25% at
Max. 20% at
sensing distance sensing distance
Max. 1ms
Max. 1ms
Max. 1.5ms
12-24VDC ±10%(Ripple P-P: Max.10%)
Max. 30mA
Infrared LED(850nm)
Red LED(660nm)
Red LED(650nm)
Built-in the adjustment VR
Light ON fixed
Light ON / Dark ON selectable by VR
NPN open collector output
or PNP open collector output
●Load voltage: Max. 26.4VDC NPN
Control output
●Load voltage: Max. 26.4VDC ●Load current: Max. 100mA
●Load current: Max.100mA
●Residual voltage - NPN: Max. 1V, PNP: Min. 2.5V
●Residual voltage: Max. 1V
Protection circuit
Reverse polarity protection, output short-circuit protection, interference prevention function(Exept BGS reflective type)
Indicator
Operation indicator: red, Stability indicator: green
Insulation resistance
Min. 20MΩ(at 500VDC megger)
Noise resistance
±240V the square wave noise(pulse width:1㎲) by the noise simulator
Dielectric strength
1,000VAC 50/60Hz for 1minute
Vibration
1.5mm amplitude or 300m/s2 at frequency of 10 to 55Hz(for 1 min.) in each of X, Y, Z directions for 2 hours
Shock
500m/s2(approx. 50G) in each of X, Y, Z directions for 3 times
Ambient illumination Sunlight: Max. 11,000lx, Incandescent lamp: Max. 3,000lx(Receiver illumination)
Ambient temperature -25 to 55℃, storage:-40 to 70℃
Ambient humidity
35 to 85%RH, storage: 35 to 85%RH
Protection
IP65(IEC standard)
Material
Case: PC+ABS, LED Cap: PC, Sensing part: PMMA
Cable
ø3.5, 3-wire, Length: 2m(AWG24, Core diameter: 0.08mm, Number of cores: 40, Insulator out diameter: ø1)
Accessory
Mounting bracket, Bolt
Mounting bracket, Bolt, Adjustment driver
Approval
Unit weight
Approx. 45g
Approx. 50g
Approx. 45g
※The temperature or humidity mentioned in Environment indicates a non freezing or condensation environment.
Environment
Response time
Power supply
Current consumption
Light source/Wavelength
Sensitivity adjustment
Operation mode
(C)
Door/Area
sensor
(Spot size)
Ø2.0/2.5mm
Transparent glass sensing type
BJG30-DDT
Diffuse reflective
30mm
15mm
(Non-glossy (Transparent
glass 50×50mm,
white paper
100×100mm) t=3.0mm)
Transparent glass,
opaque materials, translucent
Model
Type
NPN open collector output
PNP open collector output
Sensing type
(B)
Fiber
optic
sensor
A-13
(H)
Temp.
controller
(I)
SSR/
Power
controller
(J)
Counter
(K)
Timer
(L)
Panel
meter
(M)
Tacho/
Speed/ Pulse
meter
(N)
Display
unit
(O)
Sensor
controller
(P)
Switching
mode power
supply
(Q)
Stepper
motor&
Driver&Controller
(R)
Graphic/
Logic
panel
(S)
Field
network
device
(T)
Software
(U)
Other
BJ Series
Feature data
Through-beam type
● BJ15M-TDT-(C)-(P) / BJ10M-TDT-(C)-(P) / BJ7M-TDT-(P)
Measuring method
Parallel shifting characterisitic
Data
Angle characteristic
Data
Measuring method
24
L
ℓ1
Receiver
16
Emitter
12
L
θ
8
Receiver
4
80
40
ℓ1
0
40
ℓ1
80
BJ10M-TDT-(C)-(P)
12
BJ7M-TDT(P)
8
4
0
0
BJ15M-TDT-(C)-(P)
16
Sensing distance L(m)
Sensing distance L(m)
Emitter
20
BJ15M-TDT-(C)-(P)
BJ10M-TDT-(C)-(P)
BJ7M-TDT(-P)
20
30°
Left
20°
10°
0° 10° 20° 30°
Right
Center
Operation angle(θ)
Sensing area(cm)
Retroreflective type
● BJ3M-PDT-(C)-(P)
Parallel shifting characterisitic
Measuring method
Data
Sensor angle characteristic
Measuring method
Data
Reflector angle characteristic
Measuring method
Data
MS-2A
3.0
θ
L
2.0
1.0
0
160 80
ℓ1
0
ℓ1
Reflector
4.0
3.0
θ
2.0
Sensing area (mm)
0°
5° 10°
Center
Right
Operation angle(θ)
Diffuse/Narrow beam reflective type
●BJ300-DDT-(C)-(P)
Sensing area characteristic
Measuring method
Data
Sensing area characteristic
Measuring method
Data
L
ℓ1
1200
800
Standard
sensing
target
L
400
200
0
40 20
ℓ1
0
ℓ1
20
400
L
L
Sensing distance L(mm)
Sensing distance L(mm)
Standard
sensing
target
15
Sensing area(mm)
20
120
80
40
20
0
ℓ1
40 20
ℓ1
20
40
●BJN100-NDT-(P)
Sensing area characteristic
Measuring method
Data
180
160
ℓ1
80
60
Standard
sensing
target
L
40
20
0
0
ℓ1
Sensing area(mm)
Sensing area characteristic
Measuring method
Data
ℓ1
5
10
● BJN50-NDT-(P)
25
10
0
160
Sensing area(mm)
100
ℓ1 ℓ1
10
ℓ1
120
20
Standard
sensing
target
200
30
0
20 15 10 5 0 5 10 15 20
A-14
0.5
200
600
40
Sensing area characteristic
Measuring method
Data
L
1.5
Sensing area characteristic
Measuring method
Data
ℓ1
0
20
●B
JG30-DDT
Standard
sensing
target
2.5
●B
J100-DDT-(C)-(P)
800
Sensing area(mm)
ℓ1
3.5
1000
1600
Sensing distance L(mm)
Standard
sensing
target
Sensing distance L(mm)
ℓ1
4.5
0.0
40° 20° 0° 20° 40°
Center
Left
Right
Operation angle(θ)
5°
● BJ1M-DDT-(C)-(P)
2000
L
1.0
0.0
10°
Left
80 160
Sensing distance L(m)
Reflector
4.0
5.0
Sensing distance L(mm)
ℓ1
5.0
2
1
0
ℓ1 ℓ1
1
Sensing area (mm)
2
Sensing distance L(mm)
Reflector
Sensing distance L(m)
Sensing distance L(m)
6.0
140
120
100
80
60
40
20
0
2
1
ℓ1
0
ℓ1
1
Sensing area (mm)
2
Long sensing distance/BGS reflective/Micro spot type
Feature data
● BJ30-BDT / BJ30-BDT-P
● BJ50-BDT / BJ50-BDT-P
Sensing area characteristic
Measuring method
Data
Sensing area characteristic
Measuring method
Data
35
L
25
Standard
sensing
target
ℓ1
20
15
L
10
5
0
Sensing distance L(mm)
Standard
sensing
target
ℓ1
Sensing distance L(mm)
30
2.0 1.0 0 -1.0 -2.0
1.5 0.5 -0.5 -1.5
60
55
50
45
40
35
30
25
20
15
10
5
0
Sensing distance by material
10
50
100
40
30
20
10
0
White Corrugated Black Rubber SUS PCB
Acryl
paper cardboard paper (black)
(green) (transparent)
Sensing distance by color
White Corrugated Black Rubber SUS PCB
Acryl
paper cardboard paper (black)
(green) (transparent)
10
40
30
20
10
0
Sensing target(colored paper)
Connections
● Through-beam type
Black
Sensing
target
Blue
Load
※2
Load
+
-
Black
Reflector
Sensing
target
M8 Connector pin
0
(J)
Counter
White Corrugated Black Rubber SUS PCB
Acryl
paper cardboard paper (black)
(green) (transparent)
Sensing target(material)
(K)
Timer
(L)
Panel
meter
100
80
(M)
Tacho/
Speed/ Pulse
meter
60
40
(N)
Display
unit
20
White Red OrangeYellowGreen Blue Navy Violet Black
Blue
(O)
Sensor
controller
(P)
Switching
mode power
supply
● Diffuse/Narrow beam/
BGS reflective type
(Q)
Stepper
motor&
Driver&Controller
Brown
※1
Load
※2
Load
+
-
Sensing
target
Black
Blue
※1
Load
※2
Load
+
-
(R)
Graphic/
Logic
panel
(S)
Field
network
device
(T)
Software
Connections for connector part
③ ④
20
Brown
※1
※1: The load connection of NPN open collector output
※2: The load connection of PNP open collector output
① ②
(I)
SSR/
Power
controller
Sensing target(colored paper)
●Retroreflective type
Brown
+
- Blue
(H)
Temp.
controller
40
0
White Red OrangeYellowGreen Blue Navy Violet Black
Sensing target(colored paper)
Brown
(G)
Connector/
Socket
120
50
White Red OrangeYellowGreen Blue Navy Violet Black
ℓ1
Sensing distance by color
60
Sensing distance L(mm)
Sensing distance L(mm)
20
(F)
Rotary
encoder
60
Sensing distance by color
30
(E)
Pressure
sensor
80
Sensing target(material)
40
(D)
Proximity
sensor
Sensing distance by material
120
Sensing distance L(mm)
Sensing distance L(mm)
Sensing distance L(mm)
20
(C)
Door/Area
sensor
Sensing area(mm)
Sensing distance by material
30
110
100
90
80
70
60
50
40
30
20
10
0
4 3 2 1 0 -1 -2 -3 -4
ℓ1
ℓ1
60
Sensing target(material)
Sensing distance L(mm)
0 -1 -2 -3
Sensing area(mm)
40
0
1
ℓ1
ℓ1
ℓ1
Sensing area(mm)
0
Standard
sensing
target
L
2
(B)
Fiber
optic
sensor
Sensing area characteristic
Measuring method
Data
ℓ1
3
(A)
Photo
electric
sensor
● BJ100-BDT / BJ100-BDT-P
Sensing distance L(mm)
BGS reflective type
Connector pin No. Cable colors
Function
①
Brown
Power Source(+V)
②
White
-
③
Blue
Power Source(0V)
● Connector cable(sold separately)
(U)
Other
※Connector cable model
: CID408- , CLD408※Please refer to G-6 for connector cable.
④
Black
Output
※Connector pin ② is N.C(Not Connected) terminal.
A-15
BJ Series
Control output diagram
● NPN open collector output
Photoelectric sensor circuit
● PNP open collector output
Connection
Photoelectric sensor circuit
Connection
(Brown)+V
(Black)output
Over
current
protection
Load
+
-
Max.100mA
12-24VDC
±10%
(Blue)0V
Main circuit
Main circuit
(Brown)+V
Over
current
protection
Max.100mA
+
-
(Black)output
12-24VDC
±10%
Load
(Blue)0V
Operation mode
Operation mode
Light ON
Received light
Interrupted light
ON
OFF
ON
OFF
Receiver operation
Operation indicator
(red LED)
Transistor output
Dark ON
Received light
Interrupted light
ON
OFF
ON
OFF
Dimensions
(unit: mm)
●Through-beam type
●Through-beam type(Connector type)
20
2.7
20
15
2.7
M8
Cable: ø3.5, 2m
● Retroreflective type
Operation 10.6 Stability
indicator
indicator
(green)
(red)
M8
Stability indicator
(green)
Optical axis
of receiver
Optical axis
of emitter
Cable: ø3.5, 2m
20
16.7
35
18
25
2.7
15
8
32
Optical axis
of emitter
3
8.5
20
2.7
Optical axis
of receiver
3
35
Operation indicator
(red)
32
25
10.5
● Diffuse reflective type(Connector type)
- Connect the bracket B
13.3
24.6
Stability indicator(green)
3
15
2.7
15
M3 Bolt
42.5
3
Optical axis of receiver
Optical axis of emitter
● Diffuse/Narrow beam/BGS reflective type
- Connect the bracket A
22
M3 Bolt
20
Stability indicator(green)
8
32
Operation indicator 10.6
(red)
Cable: ø3.5, 2m
Operation indicator(red)
● Retroreflective type(Connector type)
20
2.7
25
8
32
25
M8
3
15
A-16
3
25
32
Operation 10.6 Stability
indicator
indicator
(green)
(red)
Power indicator
(green)
32
25
Operation 10.6 Stability
indicator
indicator
(green)
(red)
Power indicator
(green)
M3Bolt
M8
24.6
29.5
Long sensing distance/BGS reflective/Micro spot type
10.5
M3 Bolt
1.2
25
35
6
(F)
Rotary
encoder
(H)
Temp.
controller
● Retroreflective/Diffuse/Narrow beam/
BGS reflective type
High
Stable
light ON area
Operation
level
Unstable
light ON area
Unstable
light OFF area
(I)
SSR/
Power
controller
High
Incident
light
level
(J)
Counter
Operation
level
Stable
light OFF area
Stable
light OFF area
Stability
ON
indicator
(green LED) OFF
Operation
indicator
(red LED)
ON
OFF
Transistor
output
ON
OFF
Light ON
operation
Operation
indicator
(red LED)
ON
OFF
Transistor
output
ON
OFF
(M)
Tacho/
Speed/ Pulse
meter
(N)
Display
unit
(O)
Sensor
controller
※The waveforms of “Operation indicator” and “Transistor output” are for Light ON operation.
They are opposite operation for Dark ON operation.
(P)
Switching
mode power
supply
Mounting and sensitivity adjustment
For mounting
M3×18mm
Switching of operation mode
Light ON
operation
Dark ON
operation
D
Turn the switching volume of operation
mode to end of right(L direction), it is
set as Light ON.
L
D
L
(Q)
Stepper
motor&
Driver&Controller
Optical axis adjustment
Please use bolts M3 for
mounting of sensor,
set the tightening torque under
0.5N.m.
Turn the switching volume of operation
mode to end of left(D direction), it is set
as Dark ON.
※For through-beam type, the switching volume of operation
mode is built-in the receiver.
(K)
Timer
(L)
Panel
meter
Low
Stability
ON
indicator
(green LED) OFF
Low
Light ON
operation
18
R25
● Through-beam type
Unstable
operation area
(D)
Proximity
sensor
(G)
Connector/
Socket
Operation timing diagram
Incident
light
level
(C)
Door/Area
sensor
(E)
Pressure
sensor
20°
10°
Stable
light ON area
8
ø3.4
26.5
R25
8.5
22
12.5
42.5
2.5
14
36
M3 Bolt
2-ø3.8
(B)
Fiber
optic
sensor
3
8
14
52
60.5
34
40.5
(A)
Photo
electric
sensor
● Bracket B(sold separately)
3
(accessory: MS-2A,
sold separately: MS-2S, MS-3S)
● Bracket A
1.2
● Reflector
●Through-beam type
1. Place the emitter and the
Receiver
Adjust
receiver facing each other and
Right/Left
supply the power.
Emitter
s
2. After adjusting the position of
axi
tic
Op
the emitter and the receiver
and check their stable
Adjust Up/Down
indicating range, mount them
in the middle of the range.
3. After mounting this unit, check the operation of the sensor
and lighting of the stability indicator in both status. (None
or sensing target status)
※When the sensing target is translucent or small(under
sensing target of ‘ Specifications’), it may not be
detected by the sensor because the light can penetrate it.
A-17
(R)
Graphic/
Logic
panel
(S)
Field
network
device
(T)
Software
(U)
Other
BJ Series
● Retroreflective type
1.Place the sensor and the reflector
Adjust
facing each other and supply the
Right/Left
power.
2.After adjusting the position of the
sensor and reflector and check
their stable indicating range,
Reflector
mount them in the middle of the
range. (None or sensing target
Adjust Up/Down
status)
3.After mounting this unit, check the operation of the
sensor and in both status. (None or sensing target status)
Sensitivity adjustment
Order
(A)
1
2
● Diffuse/Narrow beam/BGS reflective type
After place a sensing target, adjust
the sensor to up or down, right or
left.
Then, fix the sensor in the center
of position where the stability is
operating.
Sensing
target
● Object(Copper wire) detection
[Figure 1]
When copper
wire is moved.
Copper
wire
[Figure 2]
Approx. 0 to 15°
Copper
wire
※Mount the sensor slanted at an angle ranged 0 to 15˚ shown
above as [Figure 2] for stable detection to detect as shown
in [Figure 1].
Position
Description
Turn the adjustment VR to the right of
min. and check position(A) where the
operation indicator is turned ON in “Light
MIN. MAX. ON status”.
Turn the adjustment VR more to the right
of position(A), check position(B) where
the operation indicator is turned ON. And
(A)
(C)
turn the adjustment VR to the left, check
position(C) where the operation indicator is
turned OFF in “Light OFF status”.
(B)
※If the operation indicator is not turned ON
MIN. MAX.
although the adjustment VR is turned to
the max. position, the max. position is (C).
Set the adjustment VR at the center of (A)
and (C). To set the optimum sensitivity,
check the operation and lighting of
(C) stability indicator with sensing target or
(A)
without it. If the stability indicator is not
turned ON, please check the sensing
method again because sensitivity is
MIN. MAX.
unstable.
Optimal
sensitivity
3
※No sensitivity adjustment function available for BJG30DDT models.
Light ON status
Throughbeam
type
Retroreflective
type
Emitter
Receiver
Receiver
Reflector
Diffuse/
Narrow
beam/
Sensor
BGS
reflective
Sensing
target
Background
object
Light OFF status
Emitter
Sensor
Sensing
target
Receiver
Sensing
target Background
object
Background
object
※Set the sensitivity to operate in stable light ON area and
the reliability for the environment (temperature, voltage,
dust etc) is increased. In unstable light ON area, be sure
that the variation of environment.
※Do not apply excessive force on the adjustment VR, it
may be broken.
A-18