Tachoprobe Operating Instructions A2108 Series
Contents
1. REFLECTIVE TAPE TARGET It is recommended that tape be used whenever possible to ensure ease of measurement and maximum range and angle features When reflective tape is used it is possible to use tape down to a minimum width of 3mm laser only 6mm recommended Because of the ability of the unit to use surface imperfections as a target problems may occur if the angle of the beam to the target is too close to the perpendicular It is recommended that the instrument is not used in the cone of angles 5 shown in the darker colour in the following diagram Angles stated assume datum to be at 90 to the reflective tape surface 80 Reflective Target g 80 Warning As conditions can vary greatly from application to application some experimentation may be required to determine the best method In all cases where an existing target is used the angular range of the instrument will be greatly reduced and will have to be used as close to the perpendicular to the feature being used as a target as possible If the target disc or shaft has holes gaps or cut outs it is possible to fix the reflective tape in a stationary position behind the target disc and shine the beam through the hole on to the tape LASER SAFETY Lasers produce an intense beam of monochromatic light which can cause a biological hazard Laser safety is covered by BS EN 60825 which requires lasers to be classified according to the output power level of radiation2. The laser used in this instrument is a class 2 laser Class 2 lasers are not intrinsically safe but eye protection is normally afforded by aversion responses including the blink reflex Accidental viewing is not hazardous even if optical aids Spectacles telescopes and similar devices are used Wherever reasonably practical the beam should be terminated at the end of its useful path and the laser should NOT be aimed at personnel at head height Although the instrument has a working range of 2 metres the laser beam can still dazzle at far greater distances The laser aperture is situated at the front of the instrument Do not open the instrument and attempt to adjust the output of the laser this could cause the output to increase beyond that allowed for a class 2 laser 14491 Iss 1 6 Page 4 i compact INSTRUMENTS Tachoprobe Operating Instructions A2108 Series A2108 Optical Multimeter Tachoprobe A2108 LSR Laser Optical Tachoprobe Analogue Output A2108 LSR 232 Laser Tachoprobe RS 232 Output Compact Instruments Ltd www compactinstruments co uk 14491 Iss 1 6 Page 1 Specification A2108 A2108 LSR A2108 LSR 232 Optical range 50 1000 mm typ 50 2000 mm typ 50 2000 mm typ Optical angle 45 80 80 Range 1 0 6 000 rpm 1V 1 000 rpm 6 000 max N A Range 2 0 60 000 rpm 1V 10 000 rpm 60 000 max N A Accuracy 0 5 0 5 0 1 Resolution 1 5mV 1 5mV 1 rpm Zero Offs
3. e of the A2108 i e 6V FSD For 3 and 3 1 2 digit meters it will be necessary to use the 20V range Where more accurate readings are required a 4 1 2 digit meter will be required A2108 LSR For use with data acquisition equipment must have a high input impedance The unit may be remotely controlled by connecting the blue amp red wires pins 1 amp 2 in the input lead 14491 Iss 1 6 Page 2 Instructions for use of RS232 Version A2108 LSR 232 ie With the cable supplied connect the 5 pin plug into the socket on the rear of the Tachoprobe and the D type connector into the RS232 port on the PC Run the A2108 import software on the PC the A2108 will now be under remote control assuming it has previously been configured correctly comms port etc Using the PC software turn the A2108 on Point the Tachoprobe so the beam is roughly in the centre of the tape When a reflected signal is received the A2108 green on target indicator will light The A2108 software running on the PC should now display a live speed reading Data may now be logged if required on the PC N A Or pi E po RS232 Data Output 57600 Baud 8 data 1 stop bit Output in rom updated once per revolution Format ASCII coded Hexadecimal 4 data bytes MSD first to LSD last then C R terminator E g 0 5 2 B OxOD 1323 rpm The A2108 import software uses the RTS line to turn the A2108 on off Setting RTS to TRUE will turn the A2108 on Connection
4. et 3mV max 3mV max N A Instructions for use 1 Fix a piece of reflective tape as shown below 2 The minimum size of the reflective target in the direction of travel should be twice the size of the light source image 6 to 25mm Connect the unit to a voltmeter or other required equipment Press and hold the on button range 1 or 2 as required Point the beam roughly in the centre of the tape with the bulb version align the filament pattern along the tape 6 When a reflected signal is received the green on target indicator will light 7 Releasing the on button turns the unit off immediately oe _ Tachoprobe AF a SF On target indicator Hands free button A On button Range 1 Tape orientation for use on discs or shafts LY p On punon Ranges Hands free operation 1 Turn the unit on as above While the unit is on press the hands free button The unit will now operate in hands free mode i e with no buttons pressed 2 The unit remains on whilst a signal is received it will automatically turn off after about 45 seconds if no signal is received 3 The range can be changed by pressing the relevant on button 4 To turn the unit off press the hands free button General A2108 Analogue output for use with a voltmeter Any type of meter digital or analogue may be used provided it has a high input impedance Choose a measuring range that can accommodate the maximum output voltag
5. s A2108 LSR A2108 LSR 232 OV OV K s Voltage Output i Link io C Os BREN TART Sats Remote ON OFF RS232 Output 5 way Binder socket Viewed from Plug side 5 way Binder socket Viewed from Plug side A2108 LSR A2108 LSR 232 5 way Binder 5 way Binder 9 way D type Pin 1 Blue Link 1 On Off 7 RTS Pin 2 Red Link 3 OV 5 Pin 3 Green OV 5 Data 2 Data in Pin 4 Yellow Output APPLICATION NOTES Use Without Reflective Tape laser models only Under controlled conditions reflective tape may not be required If there is an existing difference in reflectivity on part of the object to be monitored then this may be used e g keyways and slots in bright shafts spokes of a wheel fan blades etc If there is more than one target per revolution of the shaft then the resulting reading must be divided by the number of targets to obtain the correct reading In the case of multiple targets these must be equally spaced around the shaft or disc otherwise jitter will occur in the measured value this effect is most apparent at slow speeds On bright shafts it is possible to paint a non reflective segment and conversely on non reflective shafts a reflective mark can be painted 14491 Iss 1 6 Page 3
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