Can the CL17, CA610, and SP510 Pressure Plate Screws be over tightened?

Document ID

Document ID TE11225

Published Date

Published Date 01/06/2022
Question
Can the CL17, CA610, and SP510 Pressure Plate Screws be over tightened?
Summary
Explanation of how over tightening the pressure plate screws can lead to issues.
Answer
Yes, these screws can be over tightened. Applying excess torque to the screws that secure the pressure plate to the pump housing causes the brass inserts to pull out of the housing. This will prevent the pressure plate from properly sealing against the yellow follower blocks. This can result in the following problems:
  • On the CL17 and SP510, sample will leak past the pinch plate during the measurement cycle. This will result in low readings on the CL17 and can potentially cause false 'soft' readings on the SP510.
  • On the CA610 it can result in failure of of the pump to properly deliver sample and calibration standards to the measurement cell.
  • On all units it can prevent the pump from delivering reagents.
Below is a picture which shows the brass insert that has been pulled out from the screw being over tightened:

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