Hanna Instruments HI 903, Quick Start Manual

Page: 38 / 220

2-14
SETUP
2.3.5 Titrant, Solvent, Waste Bottle Assembly
The bottle top assemblies are equipped with desiccant cartridges containing indicating silica
gel which ensures that the air passing through the solvent handling system has been dried.
The desiccant has a limited capacity to absorb moisture and is typically exhausted after 2 to
4 weeks. Silica gel, indicating or otherwise, can be regenerated at 150 °C.
The bottle tops are constructed of PTFE and have been designed to accommodate reagent
bottles with GL-45 type threaded tops.
The waste and solvent bottle top assemblies include blue PTFE tubing blue for the handling
of liquid Karl Fischer solvent and a clear flexible silicone based tubing for use with the air
pump.
2.3.5.1 Titrant Bottle Assembly
(HI 900530)
Caution: Most Karl Fischer titrants give off harmful vapors. Consult
manufacturer’s MSDS for safe handling guidelines.
To assemble the titrant bottle, see Figure 9 and follow the next steps:
• Insert teflon top (J) into a GL45 screw cap (E).
• Insert a desiccant cartridge (B) without hose-barbed cap (A) through
a 10-mm fitting (F) and 10-mm o-ring (G).
• Insert and screw the desiccant cartridge assembly into the
corresponding hole in the white teflon top (J). Fasten with
10-mm fitting (F).
• Ensure that the tube protector (C) is installed on the aspiration
tubing (D).
• Insert the burette aspiration tubing (D) in the corresponding 3-mm
fitting (H) and attach the 3-mm o-ring (I).
• Insert and screw the aspiration tube fitting into the corresponding
hole.
• Push the aspiration tubing fully into the titrant bottle until only the
tube protector (C) is visible outside of the titrant bottle (K).
• Screw GL45 cap (E) with full assembly onto the titrant bottle (A).
Figure 9