Tiamo error 009-141, 874 error 13-4-1-255 

Technology: Titration

How do you know you have this problem?

Tiamo software generates the following error:

What can I try to resolve it?

The majority of the time, a gas flow error is caused by blockage. 

Follow these steps to troubleshoot the gas flow error:

• Ensure all tubing connections are tight.
• Ensure the gas tubing in the vessel is not crimped.
• If using pressurized air or gas, ensure the following:
  • Regulator is set to < 4psi.
  • The tank is not empty.
  • The valve on the cylinder is open.
• Inspect needle holder (6.2049.040 or 6.2049.050) for damage. 
• Clean or replace injection needle (6.2816.070) and outlet needle (6.2816.080).
  • Needles can be flushed with methanol or sonicated for faster cleaning.

• Clean or replace the transfer tube
  • Tube can be flushed with methanol.

Here is a video to walk you through the process: HOW TO troubleshoot gas flow issues on a Metrohm 874 Karl Fischer Oven system

• Evaluate impact of molecular sieve by connecting tubing for ‘to’ and ‘from’ of the tower to bypass the molecular sieve bottles.
  • Disconnect ‘from’ tubing from the tower (see below).
  • Disconnect ‘to’ tubing from the cap of molecular sieve bottle (see below).
  • Connect this end of the ‘to’ tubing to the ‘from’ port on the tower.
  • If error no longer occurs with sieve bypassed, replace molecular sieve.

What are some ways to prevent the problem?

• Use Metrohm KF oven vials and septum caps.
• Regularly inspect and clean needles / transfer tube.
• Regularly inspect, regenerate or replace molecular sieve.
  • The molecular sieve can be regenerated at 300 °C in the drying oven. The regeneration time is at least 24 hours. The molecular sieve is then placed in a desiccator for cooling and afterwards stored in a glass bottle with an airtight seal.

Other ideas

Submit a request for further assistance from Metrohm Technical Support at support.metrohmusa.com should error persist after these troubleshooting measures have been taken.