How to manually measure sample flow on a CL17sc when getting a LOW SAMPLE FLOW warning.

Document ID

Document ID TE12652

Published Date

Published Date 02/22/2021
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Question
How to manually measure sample flow on a CL17sc when getting a LOW SAMPLE FLOW warning.
Summary
Cl17sc manual verification of sample flow
Answer
Situation:
  • User is getting LOW SAMPLE FLOW warning.
  • User checks the flow rate at the entrance to the analyzer (with a graduated cylinder and stopwatch) and measures within the CL17sc specification of 60 to 200 mL / minute.
Likely cause of low flow:
  • The flow rate through the ¼-inch sample tubing to the analyzer is not equal to the flow rate through the analyzer.
  • The CL17sc internal tubing and flow meter create additional restrictions to sample flow through the analyzer. This needs to be accounted for when measuring flow through the analyzer.
  • For example, a flow rate of 200 mL / minute at the analyzer inlet may not result in a flow rate above 60 mL / minute through the analyzer.
 Resolution:
  • The CL17sc is designed for a flow rate of 60 to 200 mL / minute through the analyzer. Flow rate through the analyzer is displayed on the controller or through a mobile device with MSM.
  • When troubleshooting, it is incorrect to conflate the flow rate at the analyzer inlet to the flow rate required to meet the analyzer’s specifications. The flow rate should always be set using the displayed flow rate on the controller or mobile device with MSM. Manual verification of flow can be done at the analyzer drain, but not at the inlet.
  • If a user’s sample valves are in the fully opened position and they are unable to meet the minimum flow of 60 mL / minute, the installation needs to be adjusted to provide more sample pressure to the analyzer.
 See the following articles for more information on CL17sc flow rate:

CL17sc Customer Resource Library
What are the low flow and high flow options on the CL17 sample conditioning kit?
Modified Standpipe for CL17sc to address false sample leak errors

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