User Guide Panel Mount Digital Tachometer
Contents
1. and accuracy yy Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Rd Waltham MA 02451 Copyright 2005 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form airc ncern Extech 461950 Phone 01235 838 555 Email cs airconcern co uk Web www airconcern co uk2. 1955 The Extech Proximity Switch Model 461955 connects directly to the tachometer s input terminals and measures up to 36 000 RPM 600 Hz Proximity switches detect magnetic ferrous objects as they pass the sensor sending a pulse one for each pass to the meter The pulse LED on the switch lights with each pass The meter then calculates RPM and updates the LED display Operation of the Photoelectric Sensor Model 461957 Extech Photoelectric Sensor Model 461957 connects directly to the tachometer s input terminals and measures up to 6 000 RPM 100Hz When the sensor is properly powered by the voltage on terminal 3 of the meter the green power LED on the sensor will switch on Photoelectric sensors generate a light beam that is interrupted by an object as it passes through the beam Each time the beam of light is interrupted a pulse is transmitted to the meter and the red status LED on the sensor blinks The meter then calculates and displays the RPM based on the number of pulses received in a specific period of time The sensitivity adjustment screw on the sensor may have to be adjusted so that one pulse is generated for each interruption of the light beam If the red LED turns on less more than once for each interruption of the beam adjust the sensitivity screw 5 Model 461950 Version 2 0 March 2005 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from da
3. User Guide EXTECH _ _ INSTRUMENTS Panel Mount Digital Tachometer Model 461950 EPA A AD SI GS S Introduction Congratulations on your purchase of the Extech 461950 Panel Tachometer This meter displays continuous readings from 5 to 99 990 rpm Single pulse activation eliminates the need for special gears when setting up the meter in any given application Models 461955 proximity sensor and 461957 photoelectric sensor are also covered in this manual Careful use of these devices will provide years of reliable service Specifications Model 461950 Panel Tachometer Range 5 to 99 990 RPM Resolution i Accuracy Display Display update rate Power Panel cutout dimensions Bezel dimensions Meter dimensions Weight 3 61 x 1 66 x 3 54 92 x 42 x 90mm 13 9 oz 397 g Model 461957 Photoelectric Sensor Range Up to 6000 RPM 100 Hz 12 24VDC 10 Consumption 40mA max Pe NN E O 2 Model 461950 Version 2 0 March 2005 Mounting Instructions Panel Meter Mounting 1 The 461950 dimensions are Meter 3 61 x 1 66 x 3 54 92 x 42 x 90 mm Bezel 3 78 x 1 89 x 2 36 96 x 48 x 60 mm Prepare a panel cutout with the following dimensions 3 62 x 1 77 92 x 45 mm The Tachometer will fit a standard 1 8 DIN cutout Mounting hardware is provided which attaches to the sides of the meter The screws attached to the mounting bracket should be tightened to the back of th
4. e panel avoid over tightening which can bow the meter housing Proximity Switch Model 461955 Mounting Use the mounting holes to secure the proximity switch to the desired surface The sensor is the side of the switch that detects a moving metal object such as a gear tooth or a fan blade The sensor side of the switch has an X on it and is located on the opposite side of the switch from the wiring cable Refer to the top view diagram below The Proximity switch must be mounted so that the object being detected passes within 0 16 4mm of the sensor side of the switch The pulse LED will light when the sensor detects a metal object Pulse LED Mount holes Cabling Sensor gt Photoelectric Sensor Model 461957 Mounting Use the mounting holes to secure the photoelectric sensor to the desired surface The photo beam is generated and detected in the groove as depicted by the dotted line in the diagram below The object under test must pass in the groove so that the light beam can be interrupted Power Detection LEDs Sensitivity Adjust gt 3 Model 461950 Version 2 0 March 2005 Wiring Instructions The Model 461950 has seven screw terminals for AC power sensor input and sensor excitation Model 461955 Proximity Switch Wiring 1 Brown wire 10 30V supply signal to terminal 3 on the panel tachometer 12V 2 Black wire to terminal 2 3 Blue wire to terminal 1 Model 461957 Photoe
5. lectric Sensor Wiring 1 Brown wire connects to terminal 3 of the panel tachometer 2 Blue wire connects to terminal 1 3 Black wire sensor output during high to low transition or Green wire sensor output during low to high transition connects to terminal 2 Connect one wire only to terminal 2 black or green depending upon which better suits the application AC Power Wiring Meter terminals 5 6 and 7 are for AC power connections Connect to terminals 5 and 7 for 220V applications Connect to terminals 6 and 7 for 110V power applications A Wiring Diagram SENSOR INPUT POWER INPUT GND POS 12V N C 220V 110V Neutral 123405 6 7 NOTE Fusing and electrical noise preventative devices such as MOVS RC networks and line filters should be considered by the user when installing to avoid electrical noise interference 4 Model 461950 Version 2 0 March 2005 Meter and Sensor Operation Meter Operation Mount and wire the meter as previously described The Model 461950 Panel Mount Tachometer was designed to measure and display RPM in the following ranges Resolution Accuracy of rdg 10 000 99 990 rpm 10 rpm Extech sensors generate pulses that are counted by the meter and converted to RPM The meter computes RPM values based on the number of pulses detected in a given period of time and provides an RPM display on the 4 digit 9999 count LED Operation of the Proximity Switch Model 49
6. te of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Calibration and Repair Services Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance
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