OHAUS PA64 Service Manual
  1. Manuals
  2. Brands
  3. OHAUS Manuals
  4. Scales
  5. Pioneer PA64
  6. Service manual

OHAUS PA64 Service Manual

Hide thumbs Also See for PA64:
Table of Contents

Advertisement

Quick Links

See also: Instruction Manual
SERVICE MANUAL
Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the PA64 and is the answer not in the manual?

Questions and answers

Related Manuals for OHAUS PA64

Summary of Contents for OHAUS PA64

  • Page 1 SERVICE MANUAL Ohaus Corporation 19A Chapin Road, P.O. Box 2033, Pine Brook, NJ 07058-2033 (973) 377-9000...

  • Page 3: Table Of Contents

    3.3.16 Disassembling Analytical Load Cells ............... 3-22 3.3.17 Position Sensor PC Board Removal/Replacement/Adjustment - Analytical ..3-28 3.3.18 Reassembling Analytical Load Cells ............... 3-29 3.3.19 Block Style Load Cell Removal & Replacement ..........3-34 Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 4 Span Calibration ..................... A-1 Linearity Calibration ....................A-2 Appendix B SERVICE CALIBRATION Entering the Service Menu ..................B-1 Ramp ........................B-1 Service Span Calibration ..................B-2 Service 3 Point- Linearity Calibration ..............B-3 Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 5 Analytical Block Style Load Cell with InCal ............3-4 Precision Balance with InCal Mechanism ............3-4 3-10 InCal Weight Cover removed ................3-5 3-11 Bottom Housing with Load Cell, Weight Arms and Weights removed....3-5 3-12 InCal Motor removed from its Housing ..............3-6 Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 6 Shims are inserted between the Hanger and the Load Cell ....... 3-23 3-60 Analytical balance Load Cell with Top Bracket visible ........3-23 3-61 Vertical Flexure and screws, Lock Plate, washers, and bushings, removed ..3-23 Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 7 LIST OF ILLUSTRATIONS FIGURE NO. TITLE Page No. 3-107 Removing Position Sensor ................. 3-39 3-108 Ratio Beam Pin Alignment ................. 3-39 3-109 Base Plate Removal ..................3-40 3-110 Load Cell Mounting Components ............... 3-41 Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 8 Temperature Sensor extends into a hole in the Magnet ........3-52 3-157 Position Sensor on the Magnet ................3-53 3-158 Pin centered in PSB ................... 3-53 3-159 Load Cell PCB Test Connector ................3-54 Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 9 The Software Service Tool’s Replace Load Cell Tab .......... C-3 The Software Service Tool’s Replace PCB Tab ..........C-4 The Software Service Tool’s Download Software Tab ........C-5 The Software Service Tool’s Diagnostics Tab ............. C-6 Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 10 TABLE OF CONTENTS Pioneer™ Balances Service Manual viii Ohaus Corporation www.ohaus.com...

  • Page 11: Chapter 1 Getting Started

    INTRODUCTION This service manual contains the information needed to perform routine maintenance and service on the Ohaus Pioneer Precision and Analytical balances. The contents of this manual are contained in five chapters: Chapter 1 Getting Started – Contains information regarding service facilities, tools and test equipment, measuring masses, specifications, and the mechanical and electronic functions of the balance.

  • Page 12: Tools And Test Equipment Required

    6. Solder remover. SPECIFICATIONS Complete specifications for the Ohaus Pioneer Balances are listed in Tables 1-1 – 1-5. When a balance has been serviced, it must meet the specifications listed in the table. Before servicing the balance, determine what specifications are not met.

  • Page 13: Specifications: Carat Models

    100 or 150 Lin. Cal Mass 20, 50 50, 100 100, 200 200, 400 Pan Diameter 3.5 in / 9 cm 4.7 in / 12 cm Net Wt 10 lb / 4.5 kg Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 14: Specifications: Gold Models (External Calibration)

    Span Cal Mass (g) 200 or 500 2000 3000 4000 2000 3000 4000 Lin. Cal Mass (g) Pan Diameter 6.6 x 7.1 in / 16.8 x 18 cm Net Wt 10.0 lb / 4.5 kg Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 15: Balance Operation

    Allow one hour for each 5° F or 3° C temperature change before using the balance. Following temperature stabilization, allow an additional hour after turning the balance on, for the balance to stabilize. 1.5.1 OVERVIEW OF THE CONTROLS Figure 1-1. Pioneer, Carat and Gold Series displays. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 16: Overview Of The Display Indicators

    - Ounces, oz t - Ounces troy, GN - Grain, dwt - Pennyweight, mo - Mommes, m - Mesghal, t - Taels. (Taels are available in three types; Hong Kong, Singapore, and Taiwan) cl - Tical, PCS - Parts counting. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 17: Power On

    No. EXIT MENU – When [.END.] appears, press Yes to exit the menu function, or No to return to the Cal menu. Note: Press and hold No at any time to exit quickly. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 18: The Load Cell

    Counter Force Vane Weight Coils Upper Flexure Arm Top Bracket Position Sensor Hanger Temperature Ratio Beam Sensor Flexure Printed Circuit Vertical Board Flexure Magnet Flexure Bottom Flexure Arm Figure 1-4. Load Cell Assembly. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 19: Connecting The Rs232 Interface

    – Join two points at J1 to enable Tare. – Join two points at J2 to enable Print. Join the points by filling the gap: Figure 1-6. Soldering points J1 and J2. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 20: Rs232 Commands

    Stop using the default print format, begin to use the old Adventurer print format (zero) Stable off Stable on (default) Stops the scale from sending “OK” in response to instruction (non-print) commands. Returns scale to default mode of sending “OK”. Ohaus Corporation www.ohaus.com 1-10 Pioneer™ Balances Service Manual...

  • Page 21: Chapter 2 Troubleshooting

    If more than one symptom is observed, approach one area at a time, and remember that the symptoms may be interrelated. If a problem arises that is not covered in this manual, contact Ohaus Corporation for further information. Pioneer™ Balance Service Manual...
  • Page 22 InCal Weight Assembly and the Load Cell Assembly. Ensure that all parts are clean and properly aligned. Load cell assembly Repair the Load Cell. defective. (See Chapter 3.) PCB is defective. Replace the PCB. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 23 Unable to display Weighing Balance not Use Units menu to set desired units. weight in a particular enabled in menu weighing Balance. Unable to access a Mode not enabled in menu particular mode Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 24: Error Codes

    – – – – – – – Unstable weight reading Check environment: area should be free of vibrations, air currents or drafts, and temperature should meet the balance specifications. Perform Troubleshooting measures. (See Section 2.1.1.) Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 25: Chapter 3 Maintenance Procedures

    CHAPTER 3 MAINTENANCE PROCEDURES PREVENTIVE MAINTENANCE Ohaus balances are precision instruments and should be carefully handled, stored in a clean, dry, dust-free area, and cleaned periodically. Follow these precautionary steps: – When a balance has had chemicals or liquids spilled on it, all exterior surfaces should be cleaned as soon as possible with warm water on a damp cloth.

  • Page 26: Variations In Opening Pioneer Models

    Lift off the Top Cover. Then lift off the Load Cell cover. You now have access to all components of the balance. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 27: Load Cell Removal And Disassembly

    Section 3.3.2, p. 3-5. Section 3.3.6, page 3-7. Figure 3-5. Precision Load Cell: Figure 3-6. Analytical Load Cell: Section 3.3.6, page 3-7. Section 3.3.14, page 3-20. For Block Style Load Cells, see next page Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 28: Disassembly Of Precision Balances With Internal Calibration

    Precision balances with InCal mechanism. Figure 3-9 shows the balance with Top Cover and Load Cell Cover removed. Screws in InCal InCal Motor Weight Cover Screws in InCal Weight Cover Figure 3-9. Precision Balance with InCal Mechanism. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 29: Removing Internal Calibration Weights

    InCal Motor's ribbon cable from the groove in the Housing. (Disconnect the cable’s plug from the PCB on the front of the balance.) Figure 3-11. Bottom Housing with Load Cell, Weight Arms and Weights removed. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 30: Reassembling The Internal Calibration Mechanism

    Remove the Load Cell, as described in Section 3.3.3. 2. Turn the Load Cell over, so the Weight Arm assembly is visible. (See Figure 3-13.) Screws holding Weight Figure 3-13. Screws securing Weight Arm assembly. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 31: Removing The Load Cell - Precision Balances

    Load Cell out of the base. It is now possible to disassemble the Load Cell for cleaning, alignment, or replacing parts. Figure 3-16. Access the 3 screws to release Precision balance Load Cell from top center. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 32: Load Cell Disassembly - Precision Balances

    Figure 3-22. Service Fixture for 510g to 4100g 410g Precision Load Cell, attached to Precision Load Cell, attached to Hanger, Ratio Hanger, Ratio Beam, and Load Cell frame. Beam, and Load Cell frame. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 33: Precision Load Cell Top

    Figure 3-23.) If uncertain, place the Flexure on a clean flat surface and check that both sides rest evenly on the surface. Figure 3-23. Bent If a Flexure is bent even slightly, it must be replaced. Flexure. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 34: Position Sensor Board

    Figure 3-27.) This same glue provides insulation. If the wires are disconnected from the Ratio Beam, the insulation may be damaged, causing a short circuit. If this happens, the Ratio Beam must be replaced. Ohaus Corporation www.ohaus.com 3-10 Pioneer™ Balances Service Manual...

  • Page 35: Hanger

    17. Remove the screws in the Sideways Motion Stop Plate, Hole in vane must and lift it off. (See Figure 3-30.) be clear. Figure 3-29. Two screws secure Magnet Half. Figure 3-30. Sideways Motion Stop Plate. Pioneer™ Balance Service Manual 3-11 Ohaus Corporation www.ohaus.com...

  • Page 36: Magnets Must Be Clean

    Figure 3-32. Magnets must be clean. Up/Down Stop Screw as it is lifted out. The Load Cell is now completely disassembled. To reassemble the Load Cell, see Section 3.3.11, Load Cell Reassembly – Precision Balances. Ohaus Corporation www.ohaus.com 3-12 Pioneer™ Balances Service Manual...

  • Page 37: Position Sensor Board Removal/Replacement/Adjustment - Precision

    10. Tighten the screws on the Position until Err8.X does not appear. Sensor Board. (See Figure 3-35.) Note: A 2.5mm Allen Key can be cut to fit the space between the Housing and the Position Sensor Board. Pioneer™ Balance Service Manual 3-13 Ohaus Corporation www.ohaus.com...

  • Page 38: Main Printed Circuit Board (Pcb) Replacement - All Balances

    5. Complete the PCB installation using the Pioneer Software Service Tool – see Appendix C.3, Install New Main Printed Circuit Board. 6. After assembly, verify that the balance meets all specifications. (See Chapter 1.) Perform all tests. (See Chapter 4.) Ohaus Corporation www.ohaus.com 3-14 Pioneer™ Balances Service Manual...

  • Page 39: Load Cell Reassembly - Precision Balances

    4. Adjust the Up/Down Stop Screw so the groove is half way above and below the stop tab. (Close it completely, then open it completely counting the turns, then close it half-way.) Pioneer™ Balance Service Manual 3-15 Ohaus Corporation www.ohaus.com...

  • Page 40: Sideways Motion Stop Plate

    Figure 3-42: white on left, red on right. The two wires on the top connect to the Temperature Sensor. Their order is not important. Figure 3-42. Solder points on Position Sensor Board. Ohaus Corporation www.ohaus.com 3-16 Pioneer™ Balances Service Manual...

  • Page 41: Precision Load Cell Top

    Connect the cable from the Main PCB to the Position Sensor Board. Cable from Main PCB to Position Sensor Board Figure 3-46. Insert the 3 screws to secure Precision Load Cell in Bottom Housing. Pioneer™ Balance Service Manual 3-17 Ohaus Corporation www.ohaus.com...

  • Page 42: When Position Sensor Board Shows Normal Weight, Tighten Its Screws

    Allen Key. Step 18.) 20. Install the Load Cell Cover. 21. Perform Off-Center Load Adjustments. (See Chapter 4.) 22. Test the balance. (See Chapter 4.) Ohaus Corporation www.ohaus.com 3-18 Pioneer™ Balances Service Manual...

  • Page 43: Removing The Incal Mechanism From Incal Analytical Balances

    Weight Covers on both sides of Load Cell. (See Figure 3-48.) 2. Lift off the Weight Covers, and then lift out each of the Weights. InCal Weights Figure 3-49. InCal Weight Covers removed. Pioneer™ Balance Service Manual 3-19 Ohaus Corporation www.ohaus.com...

  • Page 44: Bottom Housing With Load Cell, Weight Arms And Weights Removed

    Before reinstalling the InCal mechanism, be sure all of its components are clean and free of debris. If the InCal Motor or its Cam is defective, it must be replaced. Ohaus Corporation www.ohaus.com 3-20 Pioneer™ Balances Service Manual...

  • Page 45: Reinstalling Internal Calibration Components

    Steps 1 through 4 in reverse. It is now possible to disassemble the Load Cell for cleaning, alignment, or replacing parts. Figure 3-54. On Analytical balances, the 3 screws securing Load Cell are on bottom. Pioneer Balances Service Manual 3-21 Ohaus Corporation www.ohaus.com...

  • Page 46: Disassembling Analytical Load Cells

    Flexure Arms, Analytical balance’s Load Cell. Arms, Analytical balance’s Load Cell. 2. Loosen the screws that secure the Flexure Arms to the Load Cell (not the Hanger). (See Figures 3-56 and 3-57.) Ohaus Corporation www.ohaus.com 3-22 Pioneer Balance Service Manual...

  • Page 47: Shims Are Inserted Between The Hanger And The Load Cell

    Lock Plate, washers and bushings, keeping track of their order (for later reassembly), as illustrated in Figure 3-61. Note: Be sure to lay the Flexure on a flat surface, to avoid bending it. Pioneer Balances Service Manual 3-23 Ohaus Corporation www.ohaus.com...

  • Page 48: Vertical Flexure And Screws, Lock Plate, Washers, And Bushings, Removed

    10. Carefully examine each Flexure to see if it is bent. If uncertain, place the Flexure on a clean flat surface and check that both sides rest evenly on the surface. If a Flexure is bent even slightly, it must be replaced for the balance to operate properly. Ohaus Corporation www.ohaus.com 3-24 Pioneer Balance Service Manual...

  • Page 49: Hanger With Two Screws

    15. Remove the two screws that secure the Vane as shown in Figure 3-66. Then lift the Vane out and set it aside. Figure 3-67. The Vane removed. Figure 3-66. The Vane is secured by two screws. Pioneer Balances Service Manual 3-25 Ohaus Corporation www.ohaus.com...

  • Page 50: Contact Board With 3-Wire Ribbon Cable Soldered To It

    Figure 3-70. Four screws secure the Magnet Figure 3-71. The Magnet Half, when Half to the Ratio Beam. removed, should be cleaned. Ohaus Corporation www.ohaus.com 3-26 Pioneer Balance Service Manual...

  • Page 51: A Screw Connects The Contact Board To The Load Cell

    Motion Stop Plate on top of the Load Cell. The black Up/Down Stop screw holds the Ratio Beam in place. The Load Cell is now completely disassembled. To reassemble the Load Cell, see Section 3.3.17, Reassembling Analytical Load Cells. Pioneer Balances Service Manual 3-27 Ohaus Corporation www.ohaus.com...

  • Page 52: Position Sensor Pc Board Removal/Replacement/Adjustment - Analytical

    Load Cell. Check again that an Error 8.X is not displayed. (If so, repeat Step 9.) 12. Disconnect the power. Install the Load Cell Cover and close the balance. Ohaus Corporation www.ohaus.com 3-28 Pioneer Balance Service Manual...
  • Page 53 Figure 3-80. Elongated holes on Ratio 6. Move the Contact Board from the Ratio Beam to the Load Cell frame. Beam Flexures go on the bottom. (See Figures 3-78 and 3-80.) Avoid breaking the fine wires! Pioneer Balances Service Manual 3-29 Ohaus Corporation www.ohaus.com...

  • Page 54: Installing The Magnet Half

    Contact Board. 11. Install the Vane. Make sure the post is centered and that the Vane is not rubbing. (See Figure 3-85.) 12. Remove the Service Fixture. Figure 3-85. Installing the Vane. Ohaus Corporation www.ohaus.com 3-30 Pioneer Balance Service Manual...

  • Page 55: Insert Shims Between The Hanger And The Load Cell On Both Sides

    Figure 3-91. Vertical Flexure and screws, Lock Plate, washers, and bushings. Note the different-sized screws and bushings for top and bottom. Also note the elongated hole on the bottom side of the Vertical Flexure. Pioneer Balances Service Manual 3-31 Ohaus Corporation www.ohaus.com...

  • Page 56: Analytical Incal Load Cell With Top Bracket Visible

    Housing. Connect the cable from the Main PCB to the Position Sensor Board. (See Figure 3-95.) Cable from Main PCB to Position Sensor Board Figure 3-95. Ribbon cable connects PSB to Main PCB. Ohaus Corporation www.ohaus.com 3-32 Pioneer Balance Service Manual...

  • Page 57: Reassembling Analytical Load Cells

    Figure 3-96. When Position Sensor Board shows 23. Install the Load Cell Cover. normal weight, tighten its screws with an Allen Key. 24. Perform Off-Center Load Adjustments. (See Chapter 4.) 25. Test the balance. (See Chapter 4.) Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 58: Block Style Load Cell

    Check the label on the balance and verify the capacity and model before ordering a new Load Cell kit. Note: Analytical and Precision Block Style Load Cells are different, but the service procedures are the same. Ohaus Corporation www.ohaus.com 3-34 Pioneer™ Balances Service Manual...

  • Page 59: Block Style Load Cell Removal & Replacement

    Load Cell. Serious damage to the Load Cell can make it necessary to replace the Load Cell. Figure 3-98. Service Toolset for Block Style Load Cells. PN 30020425. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 60: Internal Calibration Testing

    Figure 3-100. InCal Motor Removal. With the Incal Weight in upper-most InCal Weight position, the Motor Coupler should be in the position shown in Figure 3-101. Motor Coupler Figure 3-101. Motor Coupler. Ohaus Corporation www.ohaus.com 3-36 Pioneer™ Balances Service Manual...

  • Page 61: Incal Mechanism Removal

    Remove the three Mounting Screws from the InCal Mechanism. (See Figure 3-103.) Figure 3-104. Removing the InCal Mechanism. 3 Mounting Screws Figure 3-103. Mounting Screws holding InCal Mechanism. Slide the InCal Mechanism as shown to remove it. (See Figure 3-104.) Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 62: Incal Mechanism Installation

    Weight Arm. (See Figure 3-106.) When the Weight Mechanism is properly aligned, tighten the three screws and re-check alignment. Test the InCal Mechanism with software. (See Section 3.3.21. Ohaus Corporation www.ohaus.com 3-38 Pioneer™ Balances Service Manual...

  • Page 63: Removing Position Sensor

    Ratio Beam Pin Sensor Assembly Hole Figure 3-108. Ratio Beam Pin Alignment. Solder the Flexible Ribbon Cable to the six contacts shown in Figure 3-108. 3. Adjust the Up/Down Stop following procedures in Section 3.3.31. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 64: Removing The Block Style Load Cell From The Base Plate

    Figure 3-109. Base Plate Removal. 2. Hold the Block Style Load Cell and remove the two Load Cell Mounting Screws. (See Figure 3-109.) Note: At this point, other repairs may be made to the Load Cell. Ohaus Corporation www.ohaus.com 3-40 Pioneer™ Balances Service Manual...

  • Page 65: Installing The Block Style Load Cell On The Base Plate

    Now carefully tighten the two mounting screws and re-check alignment. Alignment Area Figure 3-111. Load Cell Alignment to Base Plate. 5. Install the Weigh Below Hook and screw at the bottom of the Base Plate. (See Figure 3-110.) Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 66: Removal And Installation Of The Block Style Load Cell Pc Board

    7. Re-solder the Temperature Sensor Board and the Position Sensor Assembly. 8. Follow instructions in Appendix C to Restore the EEPROM. Slot Mounting Screw Figure 3-113. Block Style Load Cell PC Board Removed from Load Cell. Ohaus Corporation www.ohaus.com 3-42 Pioneer™ Balances Service Manual...

  • Page 67: Load Cell Pcb-Temperature Sensor-Position Sensor Assembly

    Sensor hole! 3. Lift out the Temperature Sensor, careful to avoid stressing the wires connecting it to the Load Cell PCB. Figure 3-116. Removing Temperature Sensor. Don’t adjust screws around Temperature Sensor hole! Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 68: Removing The Ratio Beam On Block Style Load Cells

    Insert the Centering Pins from the Service Toolset in the holes provided. (See Figure 3-120.) Centering Pins Figure 3-120. Centering pins. Centering Pins Centering Pins installed installed Figure 3-121. Centering Pins Installed. Ohaus Corporation www.ohaus.com 3-44 Pioneer™ Balances Service Manual...

  • Page 69: Contact Board With Cover Holder Off

    Carefully loosen and remove the nuts on the Ratio Beam while holding the screw heads to prevent movement. This is very important! (See Figure 3-124.) Ratio Beam Loosen Nut Hold Stationary Figure 3-124. Loosening Ratio Beam Nuts. Figure 3-125. Ratio Beam Screws and Washers removed. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 70: Weight Arm Screws And Washers Removed

    Carefully slide the InCal Weight Arm as shown in Figure 3-128. Figure 3-129 illustrates the InCal Weight Arm removed. InCal Weight Arm Figure 3-128. InCal Weight Arm Removal. InCal Weight Arm Figure 3-129. InCal Weight Arm removed. Ohaus Corporation www.ohaus.com 3-46 Pioneer™ Balances Service Manual...

  • Page 71: Aluminum Sleeves Removed

    Carefully lift out the Ratio Beam. (See Figures 3-135 and 3-136.) Figure 3-136. Ratio Beam Removed. Figure 3-135. Removing the Ratio Beam. Remove the Aluminum Sleeves. (See Figure 3-137.) This completes the disassembly. Figure 3-137. Removing the Aluminum Sleeves. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 72: Installing The Ratio Beam On Block Style Load Cells

    (See Figure 3-140.) Note: Do not remove the three screws under the magnet that surround the Temperature Sensor. (See Figure 3-116, page 3-43.) Figure 3-140. Magnet Area. Ohaus Corporation www.ohaus.com 3-48 Pioneer™ Balances Service Manual...

  • Page 73: Ratio Beam Vane Slotted Area

    Load Cell may be ruined, and would then need to be replaced. Figure 3-145. Centering Pin goes into first hole after upward bend in Ratio Beam. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 74: Installing The Incal Weight Arm

    Tighten Nut head with a screw driver while Hold Screw tightening the nuts for the InCal Weight Arm. (See Figure 3-149.) Figure 3-149. Proper method for tightening nuts while holding screw head stationary. Ohaus Corporation www.ohaus.com 3-50 Pioneer™ Balances Service Manual...

  • Page 75: Centering Pins In Ratio Beam

    Contact Contact Board before inserting it Contact Board into the hole on the Load Cell Board frame. Screw Figure 3-153. Repositioning the Contact Board and Screw. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 76: Installing The Load Cell Pcb-Temperature Sensor-Position Sensor

    4. Insert the screw to secure the extends into a hole in the Magnet Temperature Sensor Board. Note: Do not adjust the screws around the Temperature Sensor hole. It could ruin the Load Cell. Ohaus Corporation www.ohaus.com 3-52 Pioneer™ Balances Service Manual...

  • Page 77: Position Sensor On The Magnet

    PSB clears Ratio Beam Vane Figure 3-158. Pin centered in PSB. Figure 3-157. Position Sensor on the Magnet. 6. Install the Ratio Beam Ribbon Cable on the PCB and the Contact Board. Pioneer™ Balance Service Manual Ohaus Corporation www.ohaus.com...

  • Page 78: Setting The Up/Down Stop Screw On Block Style Load Cells

    Maximum difference is 0.2 Volts. Figure 3-161. Up/Down Stop Screw 9. To adjust the Up/Down Stop Screw, turn the Screw and repeat Steps 2 and 3 until the readings are within specifications. (See Figure 3-161.) Ohaus Corporation www.ohaus.com 3-54 Pioneer™ Balances Service Manual...

  • Page 79: Chapter 4 Testing

    4.1.1 TEST MASSES REQUIRED The masses required to test the Ohaus Pioneer balances must meet the requirements of ASTM Class 1 or OIML E1 Tolerance. The mass values are listed in Table 4-1. TABLE 4-1. TEST MASSES REQUIRED...

  • Page 80: Performance Tests

    3. Remove the mass. The reading should return to 0g ±1 count. 4. Repeat this test three times. The reading should be within ±1 count of the reading recorded. If so, the balance passes the Precision Test. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 81: Off-Center Load Test

    5. Repeat this test for the right and front edges and note the readings. Note any differences in the displayed weight reading at all positions. See Tables 4-2 and 4-3 for maximum allowable variance for each of the four positions. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 82: Off-Center Load Adjustment For Precision Models

    11. Remove the Platform. 12. Re-assemble the balance. Adjustment Screw Holes (See Section 3.3.11.) 13. Turn Auto-Zero back to On, in Menu Setup. Figure 4-4. Off-Center Load Adjustment screw holes on Precision models. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 83: Off-Center Load Adjustment For Analytical Models

    11. Turn the balance OFF. Screw Holes 12. Remove the Platform. 13. Re-assemble the balance. (See Section 3.3.17.) 14. Turn Auto-Zero back to On, in Menu Setup. Figure 4-6. Off-Center Load Adjustment screw holes on Analytical models. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 84: Off-Center Load Adjustment For Block Style Models

    8. Adjust as shown until the tolerance is +/-5 counts. 9. Repeat Off-Center Load Test. 10. Turn the balance OFF. 11. Remove the Platform and re-assemble the balance. (See Section 3.3.11.) 12. Turn Auto-Zero back to On, in Menu Setup. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 85: Repeatability Test

    3. Remove the mass from the platform. 4. Repeat this test starting at Step 1 until you record a total of ten readings Fill in the worksheet (Table 4-4) with the ten (10) readings. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 86: Repeatability Worksheet

    Note: If the balance does not meet specifications, move it to a suitable location, ensure that it is level, and try again. If it still does not meet specifications, perform a service calibration, and try again. (See Appendix B for Service Calibration.) Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 87: Linearity Test

    13. Calculate the weight differences between the readings as shown below. 14. The maximum difference should be less than or equal to the Linearity specification for the instrument. (See Specification Tables, Chapter 1.) Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 88 The difference in the weights of the test mass should be within the tolerance in Table 1-2. If not, perform a Standard Calibration – both Span and Linearity (see Appendix A) and repeat the test. If the balance remains out of tolerance, the Load Cell may need to be repaired. Ohaus Corporation www.ohaus.com 4-10 Pioneer™ Balances Service Manual...
  • Page 89 Ohaus Corporation www.ohaus.com 19A Chapin Road P.O. Box 2033 Tel: 973-377-9000 Pine Brook, NJ 07058-2033 USA Fax: 973-593-0359 In the United States call toll free, 800-526-0659 between 8:00 a.m. and 6:00 p.m. EST. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 90 CHAPTER 5 PARTS LISTS & DIAGRAMS 5.1 PRECISION ROUND PAN BALANCE: HOUSING & PARTS Precision Round Pan Balance – Housing & Parts Figure 5-1. Precision Round Pan Balance: Housing & Parts Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...

  • Page 91: Load Cell Assembly

    Load Cell Cover EMC Plate Pan Support Weighing Pan Function Label Top Housing Liquid Crystal Display (LCD) Main Printed Circuit Board Power Adapter For all Pioneer Models, see specific parts lists through your Ohaus distributor. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 92 CHAPTER 5 PARTS LISTS & DIAGRAMS PRECISION ROUND PAN, INCAL BALANCE: HOUSING & PARTS Precision Round Pan, InCal Balance: Housing & Parts Figure 5-2. Precision Round Pan, InCal Balance: Housing & Parts. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 93 Load Cell Cover EMC Plate Pan Support Weighing Pan Function Label Top Housing Liquid Crystal Display (LCD) Main Printed Circuit Board Power Adapter *For details on Load Cell and InCal Mechanism parts, see Section 5.6. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 94 CHAPTER 5 PARTS LISTS & DIAGRAMS PRECISION SQUARE PAN, INCAL BALANCE: HOUSING & PARTS Precision Square Pan, InCal Balance: Housing & Parts Figure 5-3. Precision Square Pan, InCal Balance: Housing & Parts. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 95 Load Cell Cover EMC Plate Pan Support Weighing Pan Function Label Top Housing Main Printed Circuit Board Liquid Crystal Display (LCD) Power Adapter *For details on Load Cell and InCal Mechanism parts, see Section 5.6. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 96 CHAPTER 5 PARTS LISTS & DIAGRAMS PRECISION DRAFT SHIELD BALANCE: HOUSING & PARTS Precision Balance with Draft Shield: Housing & Parts Figure 5-4. Precision Draft Shield Balance: Housing & Parts. Ohaus Corporation www.ohaus.com Pioneer™ Balances Service Manual...
  • Page 97 Draft Shield Posts Weighing Pan Draft Shield Top Function Label Top Housing Liquid Crystal Display (LCD) Main Printed Circuit Board Power Adapter *For details on Load Cell and InCal Mechanism parts, see Section 5.6. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 98 CHAPTER 5 PARTS LISTS & DIAGRAMS ANALYTICAL BALANCE: HOUSING & PARTS Analytical Balance: Housing & Parts Figure 5-5. Analytical Balance: Housing & Parts. Ohaus Corporation www.ohaus.com 5-10 Pioneer™ Balances Service Manual...

  • Page 99: Analytical Balance: Housing & Internal Parts

    Draft Shield Posts Weighing Pan Draft Shield Top Function Label Top Housing Liquid Crystal Display (LCD) Main Printed Circuit Board Power Adapter *For details on Load Cell and InCal Mechanism parts, see Section 5.7. Pioneer™ Balances Service Manual 5-11 Ohaus Corporation www.ohaus.com...

  • Page 100: Precision Load Cell

    CHAPTER 5 PARTS LISTS & DIAGRAMS PRECISION LOAD CELL & PARTS (INCLUDING INCAL) InCal Weights for Precision Top Load Pioneer Precision Load Cell InCal Parts (with InCal Parts) Figure 5-6. Precision Load Cell & Parts (including InCal). Ohaus Corporation www.ohaus.com 5-12 Pioneer™ Balances Service Manual...
  • Page 101 Ribbon Cable from PSB to Contact Board Hanger LED Assembly InCal Weight Arm Assembly InCal Motor Assembly InCal Weight Covers InCal Weight Lifters InCal Weights: 14a=InCal Weights for Balance up to 410g 14b=InCal Weights for Balance over 410g Pioneer™ Balances Service Manual 5-13 Ohaus Corporation www.ohaus.com...

  • Page 102: Analytical Load Cell

    CHAPTER 5 PARTS LISTS & DIAGRAMS ANALYTICAL LOAD CELL & PARTS (INCLUDING INCAL) Pioneer Analytical InCal Parts Load Cell w/ InCal Parts Figure 5-7. Analytical Load Cell & Parts (including InCal). Ohaus Corporation www.ohaus.com 5-14 Pioneer™ Balances Service Manual...
  • Page 103 Position Sensor Board (PSB) Ratio Beam Flexures Vertical Flexure Assembly Bottom Flexure Arm Assembly Ribbon Cable from PSB to Contact Board InCal Weight Arm InCal Motor InCal Weight Covers InCal Weight Lifters InCal Weights Pioneer™ Balances Service Manual 5-15 Ohaus Corporation www.ohaus.com...

  • Page 104: Block Style Incal Load Cell & Parts

    CHAPTER 5 PARTS LISTS & DIAGRAMS BLOCK STYLE INCAL LOAD CELL & PARTS Pioneer Block Style Load Cell with InCal Figure 5-8. Block Style Incal Load Cell & Parts. Ohaus Corporation www.ohaus.com 5-16 Pioneer™ Balances Service Manual...
  • Page 105 CHAPTER 5 PARTS LISTS & DIAGRAMS BLOCK STYLE INCAL LOAD CELL & PARTS TABLE 5-8. BLOCK STYLE INCAL LOAD CELL & PARTS Drawing Item Description Position Sensor Ratio Beam Load Cell PCB InCal Mechanism Assembly InCal Motor Pioneer™ Balances Service Manual 5-17 Ohaus Corporation www.ohaus.com...
  • Page 106 CHAPTER 5 PARTS LISTS & DIAGRAMS Ohaus Corporation www.ohaus.com 5-18 Pioneer™ Balances Service Manual...

  • Page 107: Appendix A Standard Calibration Calibration

    The balance will retain previously stored calibration data. See Table 4-1 for specified masses for all Pioneer models. Masses must meet or exceed ASTM Class 1 or OIML E1 Tolerance. Calibration masses are available as accessories from any Ohaus dealer. A.2 Span Calibration .CAL.

  • Page 108: Linearity Calibration

    When calibration finishes, Done appears briefly, and the balance returns to weighing mode. Note: Be careful not to touch the scale or the table while calibration is in progress, as it will cause the process to fail. Ohaus Corporation www.ohaus.com Pioneer™ Balance Service Manual...

  • Page 109: Appendix B Service Calibration

    Pan. The reading will vary with other balances. Span To exit the ramp function, press No. The balance advances to the Span calibration menu. Press Yes to perform Span Calibration. (See next page.) Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...

  • Page 110: Ramp

    Then try to calibrate again. If it continues to fail, there may be an internal problem. To resolve internal problems, follow procedures in Chapter 3. Ohaus Corporation www.ohaus.com Pioneer™ Balance Service Manual...
  • Page 111 Pan. - - - 0 - - - flashes for a few second. 2000.00 The specified middle weight flashes. Place the indicated weight on the center of the Pan. Busy flashes. After a few seconds Clear Pan flashes. Remove the mass from the Pan. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 112 (or group of weights if required) in the order indicated (No.1, No.2, No.3, No.4) then remove in the correct order (No.1, No.4, No.2, No.3). This is done to reduce the affect of the individual weight inaccuracies on the linearity calibration. Ohaus Corporation www.ohaus.com Pioneer™ Balance Service Manual...
  • Page 113 The specified ¼ of maximum weight flashes. Remove ¼ of maximum weight. Busy flashes. ---0--- - - - 0 - - - flashes for a few seconds, as the balance calibrates a zero setting. Pioneer™ Balances Service Manual Ohaus Corporation www.ohaus.com...
  • Page 114 APPENDIX B SERVICE CALIBRATION endServ EndServ appears. If you have completed Service Calibration, press Yes. Otherwise, press No to cycle through the Service Menu again. When calibration is finished, the balance returns to the weighing mode Ohaus Corporation www.ohaus.com Pioneer™ Balance Service Manual...
  • Page 116 ™ Registered trademark of Ohaus Corporation. The information contained in this manual is believed to be accurate at the time of publication, but Ohaus Corporation assumes no liability arising from the use or misuse of this material. Reproduction of this material is strictly prohibited.

This manual is also suitable for:

Pa313Pa413Pa512Pa1502Pa2102Pa114 ... Show all

Table of Contents

Save PDF