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MQ-W
SERIES
Triple Beam Trigonometric Area Reflective Photoelectric Sensors
Very accurate detection by triple beam triangulation sensing method in a compact package.
Environmental resistance Immersion protected construction (equivalent to IEC IP67) High speed detection: Max. 2 ms Light-ON/Dark-ON output is wire selectable. Operating voltage of 12 to 24 V DC Adjuster and Indicators
Distance adjustment dial Adjustment indicator LED
(Comply with EMC directive MQ-W-EM type only)
* Original
Sensor
MQ-W3 type MW-W20 type Distance adjustment dial
Operation Indicator LED Adjustment indicator LED
FEATURES
Accurate detection regardless of color, material, or shape of objects Area reflective type sensor can detect white or black object at the same distance. In case of diffuse reflective type, it is difficult to detect objects of various color with the same sensitivity setting. MQ-W area reflective type sensor is useful for such a case.
No-miss operation regardless of back-grounds Area reflective type sensor does not detect objects beyond the set range. Resistant to lens surface soiling Area reflective type sensor detects the distance by the angle, not the intensity of received light. Even if the lens surface is soiled by dust or any powdery material, there is a little variation of sensing range.
MQ-W70 type
Operation Indicator LED
SENSING RANGES
Sensing range (m ft.) 0.03 .098 MQ-W3 types MQ-W20 types MQ-W70 types 0.2 .656 0.7 2.297
PRODUCT TYPE
Detection method Range Rated operating voltage Control output NPN 0.03 m .098 ft. PNP Triple beam area reflective type 0.2 m .656 ft. PNP NPN PNP Light source Infrared LED Red LED Infrared LED Red LED Infrared LED Red LED Infrared LED Red LED Infrared LED Part number MQ-W3A-DC12-24V MQ-W3AR-DC12-24V MQ-W3C-DC12-24V MQ-W3CR-DC12-24V MQ-W20A-DC12-24V *1 CE types MQ-W3A-DC12-24VEM MQ-W3AR-DC12-24VEM MQ-W3C-DC12-24VEM MQ-W3CR-DC12-24VEM MQ-W20A-DC12-24VEM
12 to 24 V DC
NPN
MQ-W20AR-DC12-24V MQ-W20AR-DC12-24VEM MQ-W20C-DC12-24V MQ-W20C-DC12-24VEM
MQ-W20CR-DC12-24V MQ-W20CR-DC12-24VEM MQ-W70A-DC12-24V MQ-W70C-DC12-24V MQ-W70A-DC12-24VEM MQ-W70C-DC12-24VEM
0.7 m 2.297 ft.
*1 These suffix EM types conform to CE. These types have the grounding connection inside of housing
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SPECIFICATIONS
1) Ratings
Operating side Load side Rated operating voltage Rated current consumption Output current capacity 12 to 24 V DC 30 mA or less (excluding load) 100 mA or less
2) Performance
Detection principle Detection method Type Part number Sensing range Detectable distance Standard target Detectable target Hysteresis Operating voltage range Response time (freq.) Initial insulation resistance Initial breakdown voltage Vibration resistance Shock resistance Protective construction Usable ambient light level Incandescent lamp Sunlight 10% or less the set range MQ-W3A-DC12-24V MQ-W3AR-DC12-24V MQ-W3C-DC12-24V MQ-W3CR-DC12-24V 0.03 m .098 ft. 0.02 to 0.04 m .066 to .131 ft. White drawing paper 1i1 cm .394i.394 inch Triple beam triangulation sensing method Area reflective type Amplifier selfcontained DC type MQ-W20A-DC12-24V MQ-W20AR-DC12-24V MQ-W20C-DC12-24V MQ-W20CR-DC12-24V 0.2 m .656 ft. 0.04 to 0.2 m .131 to .656 ft. White drawing paper 2i2 cm .787i.787 inch Opaque, translucent 20% or less of the set range 9.6 to 30 V DC ripple (P-P) included 2 ms or less (250 times per second or less) Min. 20 M between a lead wire and external housing (at 500 V DC) Between a lead wire and external housing: 500 Vrms for 1 min 10 to 55 Hz (1 cycle/min), double amplitude 1.5 mm .059 inch (2 h each on 3 axes) 980 m/s2 {approx. 100 G} (6 times each on 3 axes) Diecast case immersion protected (equivalent to IEC IP67) 10,000 lux or less 30,000 lux or less -25 to 55C -13 to +131F (non-icing condition) Max. 85% RH (non-condensing condition) -25 to 55C -13 to +131F Operation indicator: Red LED ON with light entry Adjustment indicator: Red LED ON with sufficient volume of lights Infrared LED/Red LED (R is added to the suffix of W3(20)A(C) in the part No.) MQ-W70A-DC12-24V MQ-W70C-DC12-24V 0.7 m 2.297 ft. 0.2 to 0.7 m .656 to 2.297 ft. White drawing paper 7.5i7.5 cm 2.953i2.953 inch
Ambient temperature Ambient humidity Storage temperature Indicator Light source
Note: Unless otherwise specified, the measurement conditions comprise rated operating voltage, power supply by battery, 20C 68F ambient temperature, standard target and 200 lux or less illuminance on the receiver surface.
3) Output circuit diagram
NPN Output type PNP Output type
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DATA
1. Operating range characteristics
MQ-W3 types
Operating distance (mm) (ft.)
MQ-W20 types
Operating distance (mm) (ft.)
MQ-W70 types
Operating distance (mm) (ft.)
40 .131
For 40 mm .131 ft. Moving direction Standard target (white drawing paper 10x10 mm .394x.394 inch) For 30 mm .098 ft. For 20 mm .066 ft.
200 For 200 mm .656 ft. .656 150 For 150 mm .492 ft. .492 Moving direction Standard target (white drawing paper 20x 100 20 mm .787x.787 inch) .328 For 100 mm .328 ft. 50 .164 For 50 mm .164 ft.
30 .098 20 .066
600 1.969 400 1.312 200 .656
For 700 mm 2.297 ft. For 500 mm 1.641 ft. Moving direction Standard target (white drawing paper 75x 75 mm 2.953x2.953 inch) For 300 mm .984 ft.
10 10 .394 5 0 5 .394 .197 .197 Operating range (mm) (inch)
10 10 .394 5 0 5 .394 .197 .197 Operating range (mm) (inch)
10 10 .394 5 0 5 .394 .197 .197 Operating range (mm) (inch)
2. Projector beam diameter characteristics
Light beam diameter is determined as the region where the amount of light is decreased to 1/e2 (e]2.72) when the largest amount of light is assumed as 1. MQ-W3 types MQ-W20 types MQ-W70 types
2.5 dia. 2.3 dia. 4.0 dia. (mm .098 .091 .157 inch) 6.7 dia. 6.9 dia. 7.4 dia. 8.3 dia. (mm .264 .272 .291 .327 inch) 23.0 dia. 33.0 dia. 39.0 dia. (mm .906 1.299 1.535 inch)
0 0 20 .066 30 .098 40 (mm ft.) .131
50 .164
100 .328
150 .492
200 (mm ft.) .656
0
300 .989
500 1.641
700 (mm ft.) 2.287
3 Detectable target characteristics
MQ-W3 types MQ-W20 types MQ-W70 types
700 2.297 Distance range (mm ft.) Distance range (mm ft.) 600 1.969 500 1.641 400 1.312 300 .984 200 .656 Distance setting 40 mm .131 ft. 0 100 1000 0.155 1.55 Target size (mm2 inch2) 100 .328 0 1,000 1.55 10,000 15.5 Distance setting 200 mm .656 ft. Distance setting 400 mm 1.312 ft. Distance setting 700 mm 2.297 ft. Standard target (white drawing paper 75x75 mm 2.953x2.953 inch)
Distance range (mm ft.)
40 .131
Standard target (white drawing paper 10x10 mm .394x.394 inch)
Distance setting 40 mm .131 ft.
30 .098
Distance setting 30 mm .098 ft.
200 .656
Distance setting 200 mm .656 ft. Standard target (white drawing paper 20x20 mm .787x.787 inch) Distance setting 100 mm .328 ft.
100 .328
20 .066
Distance setting 20 mm .066 ft.
0
100 10 0.155 0.015 Target size (mm2 inch2)
Target size (mm2 inch2)
4. Material characteristics
Comparision between MQ-W20A and former product Condition: Target (40i60 mm 1.575i2.362 inch), target assumed as natural shape For the former product (diffuse reflective type), depending upon the object material, the operating range varied greatly, but for the triple beam type there a little variation.
White drawing paper Corrugated carton Veneer panel Black rubber Black frosted finish Copper clad printed circuit board Aluminum panel Mirror
MQ-W3 types Condition: Target (40i60 mm 1.575i2.362 inch), natural shape
Glossy target Semi-glossy target Non-glossy target White drawing paper Black drawing paper Veneer panel Corrugated paper Black rubber Copper clad printed circuit board White acrylic Blue acrylic Mirror
MQ-W20 types Condition: Target (40i60 mm 1.575i2.362 inch), natural shape
Glossy target Semi-glossy target Non-glossy target White drawing paper Black drawing paper Veneer panel Corrugated paper Black rubber Copper clad printed circuit board White acrylic Blue acrylic Mirror
Former pruduct Triple beam type (MQ-W20A)
x x
100 200 300 400 500 600 .328 .656 .984 1.132 1.641 1.969 Distance range (mm ft.) x : Impossible
10 .033
20 .066
30 .098
40 .131
Distance range (mm ft.)
50 100 150 .164 .328 .492 Distance range (mm ft.)
200 .656
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DIMENSIONS
1. MQ-W3 types
12.6 12.2 .496 .480
mm inch
Outline dimensions
Adjustment indicator LED
Dimensions with the mounting bracket** attached
4.2 DIA. .165
4.4 Distance adjustment dial Operation indicator LED .173 3.3 3.3 .130 25.40.2 .130 2-M4 (P = 0.6) tapped 1 inch 1 M.S.:* M4 or #6 6.3 .039 .248 32 1.260 25.40.2 1 inch 6.3 .248 11.7 .461 3.3 .130
(17) 10.7 (.669) .421 4.4 24.4 .173 (1 inch) 2.2 .087 6.3 .248
7.3 .287
44.8 1.764 24 .945 10.9 .429 4 16.6 .157 .654 25.4 1 inch 4 .157 1.4 .055
0 00 4 2, 8.7 7
General tolerance: 0.5 .020
2. MQ-W20 types
Outline dimensions
Adjustment indicator LED 12.6 12.2 .496 .480 Distance adjustment dial 3.3 .130 1 .039 7.5 .295 25.40.2 7.5 1 inch .295 32 1.260 10.5 .413 3.3 .130
Dimensions with the mounting bracket** attached
4.2 DIA. .165 Operation indicator LED 4.4 .173 7.3 .287 4.4 24.4 .173 (1 inch)
(17) 10.7 (.669) .421 2.2 .087 6.3 .248
3.3 25.40.2 .130 2-M4 (P = 0.6) tapped 1 inch M.S.:* M4 or #6
44.8 1.764 24 .945 10.9 .429
0 00 4 2, 8.7 7
4 16.6 .654 .157 25.4 1 inch
4 .157 1.4 .055
General tolerance: 0.5 .020
3. MQ-W70 types
Outline dimensions
Adjustment indicator LED 4.2 DIA. .165
Dimensions with the mounting bracket** attached
18.6 18.2 .732 .717 Distance adjustment dial 3.5 .138 450.2 1-49/64
Operation indicator LED 3.5 .138
4.4 .173
1 .039 13 .512
2-M4 (P = 0.6) tapped M.S.:* M4 or #6
4 .157 4.4 4.5 DIA. .177 .173 9.1 8.1 44 .358 .319 (1-3/4 inch)
45.0 1.772
(22) 12.7 (.866) .500
52 13 2.047 450.2 1-49/64 .512 15.5 .610 12.5 .492 68.2 12.52.685 .492 24 12.4 .945 .488 17.4 .685 36.6 1.441 45 1-49/64 1.6 .063
3.5 .138
0 00 4 2, 8.7 7
*M.S.: mounting screw
General tolerance: 0.5 .020
**The mounting bracket is enclosed in the inner carton.
CONNECTING DIAGRAM
Make connection to B side with pink wire for Light ON Make connection to v side with pink wire for Dark ON Note: When switching a power source, make ground connection to the frame ground terminal or to the ground terminal. This will assure more stable operation.
Operating condition Output transistor Operation indicator LED With light intercepted ON Common use With light entering ON Lights with light entering
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OPERATING PRINCIPLES
Detection principle of new triple beam area reflective series
$ Optical triangulation sensing method
The light beam projected by the LED, passing through the condensing lens of the light projector, is applied to the surface of the target to be detected. One part of the diffused reflected light rays passes through the light receiver lens producing a spot on the position sensitive device. When the detectable target is at a position A that is at a comparatively near distance as shown in Fig. 1, a spot is produced at (a). When the target is at a position B that is far, a spot is produced at (b). Accordingly, if any spot position on the position sensitive device is detected, the distance to the target can be determined. This is the principle of optical triangulation range measurement.
Fig. 1 Optical triangulation range measurement method Other examples of this method are the automatic focusing and camera range measurement systems.
$ Triple beam type range sensing principle
The MQ photoelectric sensor area reflective type has adapted this optical triangulation range measurement principle, but in order to improve the reliability of the detection of the sensor, a more elaborate method has been devised. First, light receivers are positioned symmetrically on either side of the axis of the light projector, composing a triple beam arrangement. As shown in Fig. 2, when the moving detectable target is at the edge of the projected light beam, the spot reflected from the target is at a location different from the point where the spot is produced when the beam is completely intercepted, generating a range measurement difference of +X, but with the triple beam composition, the symmetrically arranged position sensitive device (2) has a spot produced conversely at a -X difference position, and by means of averaging both range measurement signals, the correct range measurement can be made. This results in significantly improved repeatability and background suppression.
Fig. 2 Triple beam range measurement method By averaging the range measurement signals of the 2 light receiving systems, the range measurement difference is cancelled.
$ Optical system of the triple beam photoelectric sensor
In the MQ photoelectric sensor area reflective type, it is necessary to give special consideration to the lens. In order to improve the precision, an aspherical lens, having limited spherical and coma aberration, is used. In addition, as shown in Fig. 4, a photo diode having 2 output terminals is used. By comparing the output currents from the 2 PSDs, there is no relationship to the level of the incident light. Thus, the ratio of reflection from the detectable target exerts no influence and the range measurement and detection can be interpreted accuracy.
Fig. 3 Light beam trace of the lens (a) is a spherical lens, and (b) is the aspherical lens. Because there is no aberration in (b), range measurement precision is high.
Fig. 4 PSD (position sensitive device) construction By making a calculation of the ratio of I1 and I2, the light spot position can be detected.
$ Operating principle of area reflective method
The operation of the MQ photoelectric sensor area reflective type is explained in Fig. 5. After the output from the 2 PSD elements is added, the I/V value is converted and the logarithm determined. By subtraction, the distance signal in (I1/I2) is obtained. This can be optionally set, and with the distance adjustment control, comparison with the produced value can be made to detect whether the target is or is not within the distance range.
Fig. 5 Signal processing circuit block diagram
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CAUTIONS
These products are not safety sensors and are not designed or intended to be used to protect life and prevent bodily injury or property damage. 3) If a load greater than 100 mA is connected, the output section will be damaged, so sufficient care should be taken. 4) If the wiring to the photoelectric sensors run parallel to high voltage or power lines, due to inductive noise, mis-operation or damage can occur. Wiring should be run in separate. 5) Wire 0.3 mm2 .0005 inch2 AWG22 or larger should be used for wiring up to a length of 100 m 328 ft.. 6) When the photoelectric sensors being mounted, if the unit is struck by a hammer or other heavy tool, the function can be impaired. Sufficient care should be taken. 7) The changeover from Light-ON (light entry ON) to Dark-ON (light intercepted OFF) can be carried out with the pink lead wire. For Light-ON, connect the pink wire to the B side, and for DarkON, connect the pink wire to the v side.
Distance adjustment dial Adjustment indicator LED
MQ-W3 type MW-W20 type Distance adjustment dial
Operation Indicator LED Adjustment indicator LED
1. Ambient environment
1) Use within the range of ambient temperature of -25 to +55C -13 to +131F. 2) Use within a range of 9.6 V to 30 V DC (ripple P-P included) for operating voltage. 3) Use with an ambient light level at the light receiving surface of less than 10,000 lux for incandescent lamp and less than 30,000 lux for sunlight. 4) Use a surge absorber as the internal circuit may be damaged if external surge voltage exceeds 500 V [(1.2i50) s of single polarity fullwave voltage].
MQ-W70 type
Operation Indicator LED
3. Distance adjustment
1) Set the detecting surface of the photoelectric sensor in the detecting direction and temporarily fasten it. 2) While no target in the detection region, set the distance adjustment dial to maximum (FAR) and slowly turn it counterclockwise. Continue turning the control counterclockwise until the operation indicator LED (OPE.) is extinguished. This is the adjustment position. If the indicator LED is extinguished at the maximum position, that is the adjustment position. 3) With target in the detection area, set the dial in the minimum position (NEAR) and turn the control clockwise to locate the position where the indicator LED turns ON. If the indicator LED goes ON at the minimum position, then NEAR is the adjustment position. 4) Set the control to a point midway between the locations found in 2) and 3) above. 5) Securely fasten the photoelectric sensor. When fastening, the sensor should be sufficiently secure so that it will not shift under vibration of shock.
5) Avoid using in a location with high concentrations of steam, dust, or corrosive gas. 6) The sensor is of immersion protected type, but this does not mean that it can be used in water or where there is direct impingement of rain for detecting objects.
Notes: 1. If the adjustment indicator LED does not light in the adjustment of 3) as prescribed, or if the position between 2) and 3) is less than 2 graduations, change the position of the detection surface and repeat the procedure of 1) to 4), or try to determine the source of external factors such as variation in ambient temperature, variation in target position, etc., that creating the problem. 2. The difference in detection distance due to the colors of the target is virtually non-existent, but if the actual target is one where the reflectivity is extremely low (target which have a frosted finish produced by black rubber), or where the reflectivity is extremely high (mirror, glass, or truly reflectting target), confirmation should be done with the actual target.
4. Detector
1) Keep the detector surface clean as excessive dust or dirt on the detector surface will decrease the margin of the distance range. 2) The front surface of the lens is made of polycarbonate. This material is resistant to water, weak acids and alkalis, aliphatic hydrocarbons, oils, etc., but it is not resistant to ketones, esters, halogenated hydrocarbons, or aromatic hydrocarbons.
2. Connections
1) Check all wiring before applying power since incorrect wiring may damage the internal circuit. 2) Use a load relay with a rated operating voltage of 12 V DC or 24 V DC. The voltage applied to the load relay is the operating voltage of the photoelectric sensor minus the internal voltage drop (1.2 V). Voltage fluctuations should be taken into account.
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