Bizerba Scale Calibration

Just because your Bizerba scale is operating at what you think is peak accuracy, doesn’t mean it is. Small upsets like knocking into it or transporting it from one room to the next can cause your scale to drift all out of whack. That’s why you should schedule a Bizerba scale calibration after the following scenarios:

• Initial installation 
• The scale can’t be zeroed out even after turning it off and on 
• A calibration error that doesn’t go away even after turning it off and on
• The Load Cell or Scale Board were replaced 

Note: This is how you calibrate Bizerba NCR 7870-2000 and 4500 only. Typically, the NCR 7870-4000 does not require calibration, but when it does, you should contact an authorized service technician. 

Supply List 

• Whole weight pound set: NCR part number 998-0633009
• Fractional pound weight set: NCR part number 998-0633012
• Kilogram weight set (buy locally)
• Flathead screwdriver 
• Philip head screwdriver 
• Needle Nose pliers (optional)
  • Note: If your scale does not have an integrated or remote display or the voice messaging feature, you will need to purchase a Field Service Calibration Display (NCR part number 250-0029750).

Bizerba Scale Calibration 

Checking the Scale’s Accuracy

Before you can begin calibration, you’ll want to wait at least 30 minutes after the scale has been plugged in and until the scale has reached room temperature.

• Step 1. Select your scale’s corresponding weight class– below is a chart detailing the weights in the order you’ll apply them to the scale. 

• Step 2. Add and remove weights according to the chart – Start from left to right, adding and removing the weights so they match the values listed on the chart. 
• Step 3. Repeat the process 4 times – Repeat steps 1-2 until you’ve completed the sequence a total of 4 times. If the numbers don’t add up, your scale will need to be recalibrated. 

Turning On the Calibration Switch

• Step 4. Turn off the scale and remove the top plate – Before you remove the top plate, cut power to the scale. Then, press the lift tab located on the left-hand side and remove.
• Step 5. Remove subplate assembly – Next, you’ll have to remove the cover from the lift strap assembly.
• Step 6. Unscrew the Lift Strap – With your flathead screwdriver, loosen the screw bolting the lift strap to the unit.
• Step 7. Insert a screwdriver into the Tab Slot – The Tab Slot is located on the lower left-hand side of the subplate assembly.
• Step 8. Remove the Subplate Assembly – To remove, lift the Subplate up and out from underneath the Tower Cabinet.
• Step 9. Remove the Scale Board Shield – If there’s a break seal wire or sticker, you can go ahead and break it now. Afterward, take your needle nose pliers and remove the thumbscrew. Once removed, you can extract the shield. 
• Step 10. Place the Top Plate on the rubber bumpers – Ensure that bumpers are seated in the correct sockets located underneath the Top Plate.
• Step 11. Turn the power back on – Once the power is restored, ask yourself: Does my scale have an integrated or remote display or the voice messaging feature? If the answer is yes, you can skip the next section and continue onto Calibration Procedure.

Installing the Field Service Calibration Display 

• Step 12. Remove the Tower Cabinet – Remove the 4 screws bolting down the Tower Cabinet base. Next, lift the Tower Cabinet up and off, taking care that the Indicator Panel harness remains intact. 
• Step 13. Connect the Field Service Calibration to the display – Connect the service kit to J-4 on the LC-Digital Board and to the J-5 on the old style Digital Board and restore power to scale.

Calibrating the Bizerba Scale 

• Step 14. Press the Reset/Scale Zero button – You should see the Cal and PAr come onto the screen. Make note of these values.
• Step 15. Remove the top plate – Refer to step 4.
• Step 16. Press the calibration switch – Refer to section Turning On the Calibration Switch.
• Step 17. Reinstall the Top Plate – Ensure that the rubber bumpers are seated in the correct sockets underneath the Top Plate.
• Step 18. Calibrate the scale – The display should now read Ready C 0.00 lb (0.000 kg). Press the Reset/Scale Zero button. The scale will indicate that it's ready to take its next measurement by telling you how much weight to put on it. Repeat this process until Ready 0.00 lb reappears on the screen, making sure to press the Reset/Scale button after adding each weight.
  • Note: Use the kilogram weights for the kilogram units and the lbs weights for the lbs units.
• Step 18. Record the Cal and Par values – Once the scale reads 0.00 lbs, press and hold the Reset/Scale Zero button. The Cal value represents how many times the scale has been calibrated, so this value should have increased by one. The Par value should remain the same.

Checking the Calibration’s Accuracy  

It would kind of defeat the purpose to calibrate your scale only to find out later that your painstaking labors didn’t take. To avoid making your customer pay too much or too little for their pound of turkey, it’s best to double check its accuracy while you’ve already cracked the hood. That being said, if the scale fails any of these tests, it’s best to repeat the calibration process from start to finish. 

Increasing Load Test

In order to perform this test successfully, it’s important you leave the weights on the top plate after you add them. They also need to stay on the scale in order to complete the next test.

• Step 1. Choose the corresponding weight class from the table below:

• Step 2. Follow the steps above – Only perform the steps that are associated with your scale’s unit of measurement. 
• Step 3. Compare your results to the chart’s – If the values do not fall within the value range indicated by the chart, you’ll have to repeat the calibration process. Otherwise, move onto the next step.

Over-Capacity Test 

Important: Leave weights from the Increasing Load Test still on the scale. They will also need to stay on the scale in order to complete the next test.

• Step 1. Choose the corresponding weight class from the table below: 

• Step 2. Follow the instructions above – Add or remove the weights based on your scale’s weight class. 
• Step 3. Compare your results to the chart’s – If your scale shows dashed lines in step one and falls within the value range in step 2, then today’s your lucky day! Please proceed to the next step. If you did not get the values as they are represented in the chart, sadly, you’ll have to try the calibration again. 

Decreasing Load Test 

• Step 1. Choose the corresponding weight class from the table below: 

• Step 2. Follow the instructions above – Add or remove the weights based on your scale’s weight class.
• Step 3. Compare your results to the chart’s – If your results don’t match those of the chart, then you’ll have to redo the Bizerba scale calibration. But if they do, you’re almost there! Just one last test before you can go!

Shift Test 

The measurements for the following test should be within these ranges: 

• 15.00 lb ± .01 lb (for 30.00 lb scales)
• 5.00 kg ± 0.005 kg (for 9.995 and 13.995 kg scales)

• Step 1. Put the 15.0 lb (5 kg) weight in the center of the Top Plate – Note the results. 
• Step 2. Move the weight to the upper right-hand corner of the Top Plate – Note the results.
• Step 3. Move the weight to the lower right-hand corner of the Top Plate – Note the results.
• Step 3. Move the weight to the lower left-hand corner of the Top Plate – Note the results.
• Step 4. Move the weight to the upper right-hand corner of the Top Plate – Note the results.
• Step 5. Verify the results – If your scale’s readings stayed within the margin of error, Congratulations! Your scale passed all its tests and is now ready for business.

Bizerba Scale Calibration Error Codes 

If any of these error codes appear during calibration, unfortunately, you need to fix the problem and reattempt the procedures as outlined above. 

While you’re here, check out our extensive collection of Bizerba manuals and parts diagrams. Whether you need Bizerba replacement parts, maintenance tips or cleaning hacks, Parts town’s got you covered. 

Please contact a local authorized service agent who can help with these specific units and all your commercial kitchen equipment needs.