we’re going to assemble the HI903 Volumetric Karl Fischer titrator.
This titrator is ideal for anyone who needs a reliable, accurate, all-in-one titration
system.
It offers built-in calculations for standardization of the Karl Fischer reagent, robust data transfer,
and comes with support from our dedicated technical and applications teams.
Hanna Instruments provides you with affordable and accurate equipment to help you achieve
results you can trust.
Let’s start by inspecting what comes included with your Karl Fischer titration equipment.
Inside you’ll find: The main titration unit with reagent exchange
pump attached The dosing pump with burette attached
The titration beaker The waste bottle
Glass Desiccant cartridges And a box containing O-rings, fittings, and
everything you’ll need to assemble the titrator.
We’ll start by filling the desiccant cartridges.
Fill each cartridge with the supplied silica gel desiccant.
Note that this gel is indicating and will turn from orange to clear when it needs to
be replaced or recharged.
Next, we will be attaching the dosing pump and burette.
To do this, remove the retaining screw on the pump slot and set it aside.
Then, take the pump with burette attached and connect it to the ribbon cable below the
pump slot.
Next, lower the pump into the titrator and then slide it forward until it is firmly latched.
Finally, replace the retaining screw to hold the pump in place.
Now we’ll attach the beaker and dispensing tip.
First, align the beaker support with the base plate and rotate clockwise.
Then, place the beaker ring onto the support and align with notches on top.
Then, insert the glass beaker into the ring and add the stir bar.
Carefully place the beaker top onto the glass beaker.
Secure in place by pushing the top through the beaker ring with the notches of the beaker
ring aligned with the 4 steel pins of the beaker top.
Finally, twist the beaker ring to lock the top in place.
Now we’ll work on sealing the cell.
Karl Fischer titrations ideally take place in a sealed vessel to prevent atmospheric
moisture from getting in.
This piece of Karl Fischer titration equipment uses compression fittings to accomplish this.
We’ll need to install each of these fittings.
Start with the dispensing tip.
The HI903 comes with the tip and O-ring already installed, so all we’ll need to do is fasten
the dispensing tube from the burette to the tip port.
Be sure that the fitting is finger-tight, but do not overtighten.
Now install the electrode.
Carefully insert the electrode through a 10 mm fitting with a black 10 mm o-ring just
behind the dosing tip.
This ensures that reagent mixes adequately during titration.
Be sure that the electrode is pushed as far down as possible and that the electrode pins
are aligned with the center of the beaker.
Finally, plug the electrode into the back of the titrator.
For the next step, install the tubing for the solvent handling system.
First, remove the white plugs in the solvent ports.
Then, insert the lengths of the blue PTFE tubing into the 5mm fittings and red O-rings.
You’ll find these tubes in a bag with bottle caps and clear tubing.
Set these aside for now.
Give enough length for them to be visible about a half-inch down into the titration
vessel.
Finally, tighten the fittings to ensure a snug fit.
Now we’ll add the desiccant cartridge.
This will help ensure a dry cell.
Insert the cartridge hose-barbed cap into a 10mm fitting and black 10 mm o-Ring.
Place this assembly into the remaining 10mm port.
Then, tighten it to secure it.
Next, we’ll need to put together the bottle top assemblies.
We need these on the waste, solvent, and titrant bottles.
There may be some contact with the reagents, be sure to use the proper personal protective
equipment for these steps and keep the MSDS handy.
For the titrant bottle: Insert PTFE top into a GL45 screw cap.
Most of the time, these will already be together.
Make sure you don’t confuse this top with the one for the solvent and waste, it’ll
have a slightly smaller inner diameter than the other ones.
Insert a desiccant cartridge without hose-barbed cap through a 10-mm fitting and black 10 mm
o-ring . Insert and screw the desiccant cartridge assembly
into the corresponding hole in the PTFE top.
Fasten with 10-mm fitting.
Ensure that the tube protector is installed on the aspiration tubing (D).
Insert the burette aspiration tubing in 3 mm fitting and attach the black, 3 mm o-ring.
Be sure the tube goes down into the titrant.
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
is visible outside of the titrant bottle.
Screw the GL45 cap with full assembly onto the titrant bottle.
And for the solvent and waste bottles: Insert a PTFE top into a GL45 cap.
Screw on the desiccant cap with hose barb Insert a desiccant cartridge with hose-barbed
cap through a 10 mm fitting and black 10 mm O-ring
Insert and screw the desiccant fitting into the corresponding hole.
Fasten the desiccant cartridge assembly to PTFE top with 10 mm fitting
Insert a blue PTFE tube in the 5 mm fitting and attach the red 5 mm O-ring.
Be sure that tube goes down into the liquid for the solvent.
Insert and screw the tube fitting into the corresponding hole.
Screw GL45 cap with full assembly onto titrant bottle.
Add the clear air tube to the desiccant cap and connect it to the corresponding position
on the air pump.
The “Fill” position connects to the solvent bottle assembly.
The “Empty” position connects to the waste bottle assembly
To complete assembly, plug the titrator in and flip the power switch.
Once the titrator is finished booting, it will take you to the main titration screen.
To prepare for our titration, we need to fill the cell and prime the burette with the titrant.
To fill the cell, press “Start air pump”.
The air pump will turn on.
Then, press and hold the FILL button on the titrator to fill the cell to the marked minimum
line with solvent.
Press Stop air pump, and confirm the approximate amount of solvent in the beaker.
Next, we’ll prime the burette.
Press Burette on the idle titration screen and then prime.
Confirm three prime cycles and press ENTER.
The burette will not purge the burette of air bubbles in the Karl Fischer reagent.
Once this is done, you may want to replace the solvent if it is a dark amber color.
Otherwise, you can proceed to pre-titration and start performing titrations.
For questions, contact us at sales@hannainst.com.
Our professional staff can help you through each step to ensure your titrator is operating
properly.
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