7443H-English_Manuals 10/24/13 11:13 AM Page 1 22X Builder’s Transit Level Model No. 40-6910 Instruction Manual Congratulations on your choice of this 22X Builder’s Transit Level. We suggest you read this instruction manual thoroughly before using the instrument. Save this instruction manual for future use. ©2013 Johnson Level & Tool - Rev.
7443H-English_Manuals 10/24/13 11:13 AM Page 2 Table of Contents 1. Kit Contents 2. Features and Functions 3. Location of Parts/Components 4. Operating Instructions 5. Calibration 6. 7. 8. 9. 10. Technical Specifications Care and Handling Product Warranty Product Registration Accessories 1. Kit Contents Description 22X Builder’s Transit Level Instruction Manual with Warranty Card Hard-Shell Carrying Case Qty. 1 1 1 2.
7443H-English_Manuals 10/24/13 11:13 AM Page 3 3. Location of Part/Components Focusing knob Leveling Vial Lock Lever Vertical arc Eyepiece Vertical vernier Horizontal graduated circle Horizontal vernier Vertical tangent knob Vertical lock knob Horizontal tangent knob Telescope objective lens Leveling screw Base ©2013 Johnson Level & Tool - Rev.
7443H-English_Manuals 10/24/13 11:13 AM Page 4 4. Operating Instructions IMPORTANT: It is the responsibility of the user to verify the calibration of the instrument before each use. Set-Up the instrument on the tripod When setting up the tripod, make sure the three tripod points are firmly into the ground and the top of the tripod head is as level as possible. Adjust the height of the tripod to a comfortable viewing height, and secure the retractable legs.
7443H-English_Manuals 10/24/13 11:13 AM Page 5 Keep about half the length engaged. When the bubble is centered in position #1, turn the instrument and observe the vial in position #2. Now center the bubble in position #2 using only screw C. The instrument should now be leveled, but to be certain, double-check. Rotate the instrument 180º so the vial is reversed. If the bubble will not center when reversed, follow adjustment procedure outlined under “Bubble Adjustments.
7443H-English_Manuals 10/24/13 11:13 AM Page 6 In the illustration to the right, the index has passed the 44 degree line but has not gone as far as the 45 degree line. In this case, the third vernier line from the index is lined up with one of the lines on the circle. Since each vernier line represents 15 minutes add 45 minutes to the 44 degree reading (3 times 15 minutes equals 45 minutes). Therefore our exact reading is 44 degrees, 45 minutes (44º45’). The Vertical Vernier.
443H-English_Manuals 10/24/13 11:13 AM Page 7 Bubble With an adjusting screw “A” facing to the right level of the bubble and with telescope directly in screws line with two of the three leveling screws, note to which side the bubble is off. If to the left, loosen screw “B” and tighten screw “A” very slightly to remove ONE-HALF the error. Remove the other half of the error with the two level screws in line with the telescope. If the bubble is still not exactly centered, repeat the procedure.
7443H-English_Manuals 10/24/13 11:13 AM Page 8 5.3 Instrument accuracy adjustment If the error is more than 3/16” at 100’, it is Eyepiece tube necessary to adjust the instrument. When adjusting the instrument: Eyepiece seat 1. Remove rubber cover to expose the two Set Screws calibration set screws. 2. Using a 1.5mm Allen wrench, loosen the two calibration set screws. 3. Rotate the eyepiece seat to make the crosshair center in the reticle of instrument on the same level with a known reference point.
7443H-English_Manuals 10/24/13 11:13 AM Page 9 5.5 Determining difference in elevation Measuring a difference in elevation from one set-up To find the difference of elevation between two points which can be observed from one position, set up and level your instrument about midway between these points. Be sure that a leveling rod held on both opposite points can be read when your telescope is level.
7443H-English_Manuals 10/24/13 11:13 AM Page 10 5.6 Measure the difference in elevation requiring more than one set-up If two points are either too far apart or at too great a difference of elevation to be observed from one set-up, the procedure shown below is recommended. This example assumes that you want to find the difference in elevation between points A and D.
7443H-English_Manuals 10/24/13 11:13 AM Page 11 5.7 Stadia Distance Measuring Distance measuring can be done using the stadia hairs of the reticle. The distance between the upper stadia hair and the lower stadia hair is set at a 1:100 ration. So if the difference is 1 foot, the person holding the grade rod is 100 feet away from the instrument. 5.8 Measuring Horizontal Angles To measure or lay out an angle, set the instrument over a point and level it up. Use a plumb bob with about six feet of string.
7443H-English_Manuals 10/24/13 11:13 AM Page 12 instrument over point F in accordance with previous instructions. Rotate the instrument until point E is nearly in line with the vertical crosshair. Turn tangent screw until vertical crosshair is on point E. By hand set the horizontal circle to read zero. Swing the telescope toward point G until the vertical crosshair is exactly on point G. Your instrument is furnished with a vernier and you will be able to read the angle closer than a single degree.
7443H-English_Manuals 10/24/13 11:13 AM Page 13 6. Technical Specifications Telescope Magnification Leveling accuracy Working range Minimum focus Clear objective aperture Field of view Number of lenses Level vial Graduation diameter Erect 22X ± 3/16"/100 ft. (±5mm/30m) Up to 200’ (60m) 4’ (1.2m) 22mm ± 2’/100 ft. (±0.6m/30m) 5 4’ per 2mm 110mm Horizontal circle: Graduations Number Vernier 1º Each 10º, 0-90-0º Double direct to 15 min.
7443H-English_Manuals 10/24/13 11:13 AM Page 14 7. Care and Handling Care must be taken to maintain the accuracy of the instrument. • After each use, the instrument should be wiped clean and kept in its carrying case. • Remove dust from the lenses with a soft brush or a nonabrasive wipe. Never tough the lenses with your fingers. • Store the instrument in a dust-free area with low humidity. 8. Product Warranty Johnson Level & Tool offers a three year limited warranty on each of its products.
7443H-English_Manuals 10/24/13 11:13 AM Page 15 NOTE: The user is responsible for the proper use and care of the product. It is the responsibility of the user to verify the calibration of the instrument before each use. For further assistance, or if you experience problems with this product that are not addressed in this instruction manual, please contact our Customer Service Dept. In the U.S., contact Johnson Level & Tool’s Customer Service Department at 888-9-LEVELS.
7443H-English_Manuals 10/24/13 11:13 AM Page 16 10. Accessories Johnson® accessories are available for purchase through authorized Johnson® dealers. Use of non-Johnson® accessories will void any applicable limited warranty and there will be NO WARRANTY. If you need any assistance in locating any accessories, please contact our Customer Service Department. In the U.S., contact Johnson Level & Tool’s Customer Service Department at 888-9-LEVELS.
