Hanna Instruments HI931, User Manual

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11-3
MAINTENANCE PERIPHERALS
The 25-mL burette included with the titrator exceeds the ISO 8655 standard for accurate delivery of liquids by a motor-driven piston
burette.
11.1. BURETTE MAINTENANCE
11.1.1. BURETTE ASSEMBLY
The burette is delivered with a 25-mL syringe inside and with all of the accessories mounted (see Setup chapter). The burette
assembly consists of a rigid housing which holds the glass syringe, a 3-way valve and titrant tubing.
11.1.2. CHANGING THE BURETTE
Remove the burette from the pump assembly by sliding it forward and then slide the new burette into place.
11.1.3. DISASSEMBLING THE BURETTE
The aspiration and the dispensing tubes have fittings and tube protectors. The aspiration tube is mounted in the left side and the
dispensing tube is mounted in the right side of the burette.
To remove the dispensing tube and the aspiration tube follow these steps:
• Remove the blue tube protector (A) by sliding it off the clear titrant tubing.
• Remove the tube lock (B) from the burette holder.
• Turn the fitting (C) counter-clock wise to remove it from the burette holder.
• Slide the clear titrant tubing through the fitting.