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 (Comply with EMC directive MQ-W-EM type only) * Original MQ-W3 type MW-W20 type Sensor Operation Indicator LED Distance adjustment dial 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 Adjustment indicator LED Adjustment indicator LED Operation Indicator LED SENSING RANGES Sensing range (m ft.) 0.03 .098 0.2 .656 0.7 2.297 MQ-W3 types MQ-W20 types MQ-W70 types PRODUCT TYPE Detection method Range Rated operating voltage Control output NPN 0.03 m .098 ft. PNP Triple beam area reflective type 12 to 24 V DC NPN 0.2 m .656 ft. PNP 0.7 m 2.297 ft. NPN PNP Light source Part number *1 CE types Infrared LED MQ-W3A-DC12-24V MQ-W3A-DC12-24VEM Red LED MQ-W3AR-DC12-24V MQ-W3AR-DC12-24VEM Infrared LED MQ-W3C-DC12-24V MQ-W3C-DC12-24VEM Red LED MQ-W3CR-DC12-24V MQ-W3CR-DC12-24VEM MQ-W20A-DC12-24V MQ-W20A-DC12-24VEM Infrared LED Red LED Infrared LED Red LED Infrared LED MQ-W20AR-DC12-24V MQ-W20AR-DC12-24VEM MQ-W20C-DC12-24V MQ-W70A-DC12-24V MQ-W70A-DC12-24VEM MQ-W70C-DC12-24V MQ-W70C-DC12-24VEM *1 These suffix EM types conform to CE. These types have the grounding connection inside of housing 180 03/2003 MQ-W20C-DC12-24VEM MQ-W20CR-DC12-24V MQ-W20CR-DC12-24VEM MQ-W SPECIFICATIONS 1) Ratings 12 to 24 V DC Rated operating voltage Operating side Rated current consumption Load side 30 mA or less (excluding load) 100 mA or less Output current capacity 2) Performance Detection principle Triple beam triangulation sensing method Detection method Area reflective type Type Amplifier selfcontained DC type MQ-W3A-DC12-24V MQ-W3AR-DC12-24V MQ-W3C-DC12-24V MQ-W3CR-DC12-24V Part number Sensing range Detectable distance Standard target MQ-W20A-DC12-24V MQ-W20AR-DC12-24V MQ-W20C-DC12-24V MQ-W20CR-DC12-24V MQ-W70A-DC12-24V MQ-W70C-DC12-24V 0.03 m .098 ft. 0.2 m .656 ft. 0.7 m 2.297 ft. 0.02 to 0.04 m .066 to .131 ft. 0.04 to 0.2 m .131 to .656 ft. 0.2 to 0.7 m .656 to 2.297 ft. White drawing paper 11 cm .394.394 inch White drawing paper 22 cm .787.787 inch White drawing paper 7.57.5 cm 2.9532.953 inch Detectable target Opaque, translucent Hysteresis 10% or less the set range Operating voltage range Response time (freq.) Initial insulation resistance Initial breakdown voltage Vibration resistance Shock resistance 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) Protective construction Usable ambient light level 20% or less of the set range Diecast case immersion protected (equivalent to IEC IP67) Incandescent lamp 10,000 lux or less Sunlight 30,000 lux or less Ambient temperature Ambient humidity -25 to 55C -13 to +131F (non-icing condition) Max. 85% RH (non-condensing condition) Storage temperature Indicator Light source -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.) 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 03/2003 181 MQ-W DATA 1. Operating range characteristics 30 .098 20 .066 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. Operating distance (mm) (ft.) 40 .131 MQ-W70 types Operating distance (mm) (ft.) MQ-W20 types Operating distance (mm) (ft.) MQ-W3 types 200 For 200 mm .656 ft. .656 600 1.969 150 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. 400 1.312 200 .656 50 .164 For 50 mm .164 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) 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) 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) 0 0 20 .066 30 .098 23.0 dia. 33.0 dia. 39.0 dia. (mm .906 1.299 1.535 inch) 6.7 dia. 6.9 dia. 7.4 dia. 8.3 dia. (mm .264 .272 .291 .327 inch) 50 .164 40 (mm ft.) .131 100 .328 150 .492 200 (mm ft.) .656 0 300 .989 500 1.641 700 (mm ft.) 2.287 3 Detectable target characteristics MQ-W20 types Standard target (white drawing paper 10x10 mm .394x.394 inch) Distance setting 30 mm .098 ft. 30 .098 MQ-W70 types 700 2.297 200 .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 0 Distance setting 40 mm .131 ft. 0 100 10 0.155 0.015 Target size (mm2 inch2) 600 1.969 Distance setting 700 mm 2.297 ft. Standard target (white drawing paper 75x75 mm 2.953x2.953 inch) 500 1.641 Distance setting 400 mm 1.312 ft. 400 1.312 300 .984 Distance setting 200 mm .656 ft. 200 .656 Distance setting 20 mm .066 ft. 20 .066 Distance range (mm ft.) Distance setting 40 mm .131 ft. 40 .131 Distance range (mm ft.) Distance range (mm ft.) MQ-W3 types 100 .328 0 100 1000 0.155 1.55 Target size (mm2 inch2) 1,000 1.55 10,000 15.5 Target size (mm2 inch2) 4. Material characteristics Former pruduct Corrugated carton Triple beam type (MQ-W20A) Veneer panel Black rubber Black frosted finish Copper clad printed circuit board x x Aluminum panel Mirror 100 200 300 400 500 600 .328 .656 .984 1.132 1.641 1.969 Distance range (mm ft.) x : Impossible 182 White drawing paper MQ-W20 types Condition: Target (4060 mm 1.5752.362 inch), natural shape Glossy target Semi-glossy target Non-glossy target White drawing paper MQ-W3 types Condition: Target (4060 mm 1.5752.362 inch), natural shape Glossy target Semi-glossy target Non-glossy target Comparision between MQ-W20A and former product Condition: Target (4060 mm 1.5752.362 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. Black drawing paper Veneer panel Corrugated paper Black rubber Copper clad printed circuit board White acrylic Blue acrylic Mirror 10 .033 20 .066 30 .098 Distance range (mm ft.) 03/2003 40 .131 White drawing paper Black drawing paper Veneer panel Corrugated paper Black rubber Copper clad printed circuit board White acrylic Blue acrylic Mirror 50 100 150 .164 .328 .492 Distance range (mm ft.) 200 .656 MQ-W DIMENSIONS Outline dimensions mm inch 1. MQ-W3 types Dimensions with the mounting bracket** attached Adjustment indicator LED 12.6 12.2 .496 .480 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 0 00 4 2, 8.7 7 2. MQ-W20 types 12.6 12.2 .496 .480 2.2 .087 6.3 .248 4.4 24.4 .173 (1 inch) 44.8 1.764 24 .945 10.9 .429 4 .157 1.4 .055 4.2 DIA. .165 Distance adjustment dial Operation indicator LED (17) 10.7 (.669) .421 4.4 .173 3.3 25.40.2 .130 2-M4 (P = 0.6) tapped 1 inch M.S.:* M4 or #6 7.3 .287 2.2 .087 6.3 .248 4.4 24.4 .173 (1 inch) 7.5 .295 25.40.2 7.5 1 inch .295 32 1.260 10.5 .413 3.3 .130 44.8 1.764 24 .945 10.9 .429 0 00 4 2, 8.7 7 3. MQ-W70 types Outline dimensions 4 .157 1.4 .055 General tolerance: 0.5 .020 Dimensions with the mounting bracket** attached 4.2 DIA. .165 Distance adjustment dial 1 .039 4 16.6 .654 .157 25.4 1 inch Adjustment indicator LED 18.6 18.2 .732 .717 3.5 .138 General tolerance: 0.5 .020 Dimensions with the mounting bracket** attached Adjustment indicator LED 1 .039 7.3 .287 4 16.6 .157 .654 25.4 1 inch Outline dimensions 3.3 .130 (17) 10.7 (.669) .421 450.2 1-49/64 Operation indicator LED 3.5 .138 4.4 .173 2-M4 (P = 0.6) tapped M.S.:* M4 or #6 13 .512 45.0 1.772 (22) 12.7 (.866) .500 4 .157 4.4 4.5 DIA. .177 .173 9.1 8.1 44 .358 .319 (1-3/4 inch) 52 13 2.047 450.2 1-49/64 .512 15.5 .610 12.5 .492 68.2 12.52.685 .492 3.5 .138 0 00 4 2, 8.7 7 24 12.4 .945 .488 17.4 .685 36.6 1.441 45 1-49/64 *M.S.: mounting screw 1.6 .063 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. 03/2003 Operating condition Output transistor With light intercepted ON Common use With light entering ON Operation indicator LED Lights with light entering 183 MQ-W 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 compara- tively 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 184 03/2003 MQ-W 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. 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 [(1.250) s of single polarity fullwave voltage]. 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. 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. 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. 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. 03/2003 Distance adjustment dial MQ-W3 type MW-W20 type Distance adjustment dial MQ-W70 type Adjustment indicator LED Operation Indicator LED Adjustment indicator LED Operation Indicator LED 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. 185