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Fix for “stopcock blocked” message in Tiamo

You are here:   Metrohm USA   >>   Support   >>   FAQs   >>   Titration - Stopcock

 

  1. Close Tiamo software then re-start. All dosing units are initialized and sometimes that is enough to clear the message.
  2. If message persists, remove Dosino® from the buret then unscrew the buret from the reagent bottle. Follow the instructions below to dismantle the unit.
  3. If the Dosino drive shaft is extended into the buret, unscrew the buret and Dosino together from the reagent bottle. Pull the buret cylinder with the black valve disk down and away from the drive. Using the manual control, activate “fill” to pull the drive shaft up. Follow the directions below to dismantle and clean the unit.

Dosino disassemble

  1. Open the housing by depressing the locking button, rotate it counterclockwise and lift it off upwards.
  2. Lift off the centering tube carefully.
  3. Use the piston pliers to pull out the piston peg from the cylinder.
  4. Lift off the cylinder with the base from the distributor.
Locking button

6.1546.030 piston pliers		  
NEVER place the piston peg on its side!
NEVER remove the cylinder nor the valve disk from the cylinder base!
  NEVER remove the distribution disk!

Cleaning

  • Liquid detergent, e.g., ethanol
  • Diluted soap water
  • Rinse with distilled water
  • Dry with fiber-free cloth
  • Ultrasonic bath
  • NO abrasives!
    No damage to the surface
• centering tube • housing • cylinder • piston peg • black valve disk • white distribution disk

Follow the steps below to re-assemble the unit.

Assembly of glass cylinder

  1. Place glass cylinder on a plane surface.
  2. Position first ridge of the piston peg into the glass cylinder.
  3. Carefully place the centering tube over the piston peg. Match the width of the tongues at the bottom.
  4. Place the housing over the centering tube.
  5. ONLY now apply pressure on the top to merge all parts together.
 
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Assembly of distributor

  1. Place the distributor on a plane surface.
  2. Place assembled cylinder tube on the distributor and align the ribs.
  3. Place housing over the assembled cylinder tube, again paying close attention to the position of the ribs.
  4. Hold the white part of the distributor and turn the housing clockwise until it locks.
  5. Turn the dosing buret unit upside down, place it on a plane surface and press lightly to align the piston peg to the housing level.
  6. Check the position of the valves—the two triangles must be aligned.