ManUal - General Tools And Instruments
Contents
1. C requires no regular maintenance other than light cleaning of the plastic housing and display with a soft dry cloth When the icon cx appears on the display it s time to change the instrument s three AAA batteries because their total potential has fallen below 4 0 volts To do so perform the procedure detailed in the Setup Instructions section on page 6 Remove the batteries whenever the tachometer is expected to sit idle for an extended period of time six months or more 12 WARRANTY INFORMATION General Tools amp Instruments General s LT2234C Non Con tact Tachometer is warranted to the original purchaser to be free from defects in material and workmanship Subject to certain restrictions General will repair or replace this instru ment if after examination the company determines it to be defective in material or workmanship for a period of one year This warranty does not apply to damages that General de termines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to General Tools amp Instruments or to a General authorized serv ice center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any in cidental special consequential or punitive dama2. LT2234C USER S MANUAL NON CONTACT TACHOMETER Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS 3 Key 4 Safety 1 51 0 4 What s the 4 Product 5 Setup Instructions 6 Operating Instructions 6 10 Making rpm Measurements 6 7 Storing and Recalling 8 10 Measurements Specifications 11 12 Maintenance 12 Warranty 13 Return For Repair Policy 14 INTRODUCTION Thank you for purchasing General Tools amp Instruments Model LT2234C Non Contact Tachometer Please read this user s manual carefully and thoroughly before using the instrument The LT2234C is a general purpose handheld instrument that can measure the rotational speed of a motor s or generator s spinning shaft It does so by bouncing a laser beam off a piece of reflective tape affixed to the shaft and using an in tegrated photocell to count the number of reflections pro duced per minute Measurements are displayed in real time 0 7 in 18mm high backlit liquid crystal display and stored in memory Up to 96 measurements of rpm can be stored indexed and recalled along with the last val
3. d move it as Close to the shaft as possible but no closer than 2 inches away Position the instrument so its main axis is aligned with the end of the shaft Using your right thumb press the Measure button callout 1 4 while shining the red laser beam on the reflective tape Confirm that the tachometer is receiving a signal by checking that the Monitor Indi cator icon flashes on the display each time the beam hits the moving tape When the display reading stabilizes release the Measure button TWO MEASUREMENT TIPS 1 If your motor generator s shaft spins slowly i e at less than 50 rpm getting an accurate reading may require placing one or more additional squares of reflective tape on the target Begin by adding a second square of tape on the circumference of the target 180 from the first square at 6 o clock rela tive to 12 o clock Then perform Step 4 above but divide the display reading by two to account for the presence of the second square If the result is still unsatisfactory add another two pieces of tape at 3 o clock and 9 o clock and perform Step 4 but now divide the display reading by four 2 If bright ambient light is preventing the LT2234C from receiving the reflected beam try shading the target STORING AND RECALLING MEASUREMENTS The LT2234C can store up to 96 measurements of rpm and recall them in the order in which they were made and stored Individual measurements or series of measurement
4. g shaft 1 2 Reflected laser light to internal photosensor 1 3 Five digit liquid crystal display 1 4 Measure button 1 5 MEM button 1 6 Battery compartment cover on back SETUP INSTRUCTIONS INSTALL BATTERIES Install the three AAA batteries that came with the instru ment in its battery compartment To open the compartment remove the Phillips head screw holding its cover callout 1 6 in place and slide it away When installing the batteries use the and marks stenciled inside the battery compart ment to position them correctly OPERATING INSTRUCTIONS MAKING RPM MEASUREMENTS To measure the rotational speed of a motor generator shaft 1 Identify the target Determine whether there is a larger surface to measure than the shaft itself If something with a larger diameter for example a fan or a wheel of any type is attached to the shaft use any flat part of its surface as the measurement target instead 2 Prepare the target Either unplug the generator motor or make sure that it cannot be turned on remotely or turn on automatically Scrape the target area clean enough so a piece of tape will stick to it If the target area is naturally reflective cover it with black tape or paint 3 Attach reflective tape to the target Cut a 1 2 in square piece of reflective tape remove its backing and apply it to the target area 4 Make the measurement Turn on the motor or generator Cradling the tachometer in your right han
5. ges or for any cost attorneys fees expenses or losses alleged to be a consequence of any damage due to failure of or defect in any product including but not limited to any claims for loss of profits 13 RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instru ment requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail ad dress 14 NOTES 15 Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 80 White Street New York NY 10013 3567 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com LT2234C User s Manual Specifications subject to change without notice 2010 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN LT2234C 12 09 10 16
6. hen press and hold it again the display will then show 2 followed by the value of your second measure ment Release press and hold again and the display will show 3 followed by the value of your third measurement By repeating this sequence you can retrieve up to 96 meas urements in the order in which they were stored Once all of the stored measurements have been displayed the tachome ter will return to the mode in which pushing the MEM button once twice or three times calls up the minimum maximum and last values of the set of measurements you have stored 10 SPECIFICATIONS Measurement range 2 5 to 99 999 rpm Measurement resolution 0 1 rpm for readings below 999 9 rpm 1 rpm for readings above 1 000 rpm Measurement accuracy 0 05 of reading plus one digit Sampling time 0 8 seconds at speeds over 60 rpm Memory capacity 96 measurements Recallable measurements Maximum minimum last values Microcontroller Single custom chip Time base Quartz crystal Display type 5 digit yellow green backlit liquid crystal Display height 0 7 in 18mm Instrument dimensions 7 24 x 2 99 x 1 18 in 184 x 76 x 30mm Instrument weight 6 35 oz 180g including batteries Power source Three AAA batteries Current consumption 45mADC for display 35mADC for laser diode Operating temperature range 32 to 122 F 0 to 50 C up to 80 relative humidity MAINTENANCE TIPS The LT2234
7. s can only be stored while the Measure button is pressed and held When the Measure button is released the contents of the in strument s memory are frozen When the Measure button is pressed again the memory s contents are erased To store an individual measurement press the MEM button callout 1 5 before releasing the Measure button To store a series of measurements press the MEM button after each measurement Remember not to release the Meas ure button until you have completed storing the entire series of measurements To recall an individual measurement press the MEM but ton once and hold it The display will show the last measure ment stored unless the Measure button was pressed in the interim To recall a series of stored measurements you have three options 1 One is to press the MEM button once and hold it Doing 80 will illuminate the display which will show the highest of the measurements stored in mem ory along with the word UP Note that if you continue holding the MEM button the display will alternate be tween showing the highest value and UP Also note that releasing the MEM button powers off the display and the instrument 2 The second option is to press the MEM button twice and hold it Doing so again illuminates the display but now it shows the last reading you stored in dicated by and alternating with the letters LA 3 The third option is to press the MEM bu
8. tton three times and hold it Doing so retrieves the slowest of the measure ments you have stored This value is shown alternating with the letters dn signifying the min imum speed To try out other memory related features first push the Measure button on the right side Then press the MEM button once twice and three times holding it in each time and note from the display that all of your stored measurements have been erased indicated by 0 0 readings for UP dn and LA You can confirm this by pressing and holding the MEM button until the display begins counting down from 20 When the count reaches 0 the display immediately switches to show ing the letters AN on the left side and a number in this case 0 on the right The letters AN are an abbreviation for the Ancient Greek word for recall To complete your understanding of the tachometer s memory function make and store a set of five rom measurements remembering not to push the Measure button until you are finished Then press and hold the MEM button as many times as needed to make the display go into countdown mode Note that because you have stored five measurements the display will read AN 5 once the countdown reaches zero If you release the MEM button and then press and hold it again the display will first read 1 and then the value of the first of the five measurements you stored If you release the MEM button and t
9. ue the minimum value and the maximum value of a series Thanks to its five digit display and the use of a non contact meas urement technique the tachometer can measure the speeds of shafts spinning at up to 99 999 rpm The LT2234C is powered by three AAA batteries included KEY FEATURES Uses non contact measurement technique and autoranging Wide measurement range and high resolution Backlit 0 7 in high display supports work in low light Stores and indexes up to 96 measurements e Memorizes the last minimum and maximum values of a series of measurements One handed operation Automatically powers off when not measuring extending battery life Durable ABS plastic housing SAFETY INSTRUCTIONS Spinning shafts and fast moving belts can be dangerous When using the tachometer take care not to let your fingers hands hair or clothing make contact with moving parts WHAT S IN THE CASE The LT2234C comes fully assembled in a hard carrying case along with fresh batteries two 24 in 600mm long strips of 1 2 in 12mm wide adhesive reflective tape and this user s manual PRODUCT OVERVIEW Figure 1 shows all of the controls and indicators and other physical features of the LT2234C Familiarize yourself with their positions before moving on to the setup procedure 1 1 1 2 Fig 1 The LT2234C s controls and indicators and other physical features 1 1 Reflective tape on spinnin
Download Pdf Manuals
Related Search