Solid And Powder Sample Sampling; Gaseous Sample Sampling - Mitsubishi CA-200 Instruction Manual

CA-200

5-5-2. Solid and powder sample sampling

Solid and powder samples easily soluble in anode solution can be titrated directly.
Insoluble samples can be measured by connecting a water vaporizer Model VA-200 (option)
or an automatic water vaporizer Model VA-124S (option) to KF-200.
Refer to each instruction manual. Use the following samplers to measure samples. Dry them well
before use.
Straight powder sampler, Powder sampler, Sampler for high concentration
Airtight sampler, Solid sampler (When a water vaporizer is used.)
(1) Take a sample and weigh "W".
Dehydrate a titration cell, take a sample with a sampler, weigh "W"
(the weight of a sampler and a sample) with an electronic balance, and input "W".
(2) Inject the sample.
Take off the sealing plug or the sample injection plug on the top of the titration cell, and inject the
sample not to touch the sample into the cell. Put on the sealing plug or the sample injection plug
immediately.
(3) Weigh "w".
Weigh "w" (the tare weight of sampler) with an electronic balance and input "w".
POINT
Even if a sample is hard to solve, it can be measured when moisture can be extracted in
anode solution. Input the time (min.) to extract the moisture into "Delay".
If measurement is hard to reach the end point, moisture can remain and be extracted
slowly.

5-5-3. Gaseous sample sampling

Use the following adapters for gaseous samples. Dry them well before use.
An example of gaseous sample measurement by using a gas adapter is described here.
(1) Preparation of a titration cell
Insert a gas adapter into the sample injection plug of a titration cell.
Replace the drying tube on the titration cell top with one with a 3-way cock.
Turn the cock of the drying tube with a cock to be "T" to open the outlet directly to the atmosphere.
Connect a gas flow meter to the outlet with a vinyl pipe.
(2) Electrolysis preparation
For moisture trapping, pour 150ml generator solution and 10ml cathode solution.
(3) Measurement
Turn the 3-way cock of the gas adapter to the atmosphere side and flow sample gas flow at a
controlled flow rate. When the background is stable, turn the 3-way cock to the titration cell side and
measure moisture. Gas flow should be 250 to 500ml/min.
Section 5: Moisture Measurement Mode
5-19