© BTG
Operation Manual Mütek
TM
PCD-05, September 2017
55
VII. Maintenance
- By pressing "NO" the following screen will open:
• By pressing "YES" a new correction factor for
Poly-Dadmac will be calculated and stored
under the tab "Titratior" for further measure-
ments.
• By pressing "NO" you will keep on working with
the original correction factor of Poly-Dadmac.
Information
A standard titration verifies functionality of the Mütek™
PCD-05 and checks on the concentation of the used tit-
rants.
7.2.4
Checking the streaming potential
If a freshly cleaned measuring cell is filled with 10 ml of
anionic standard Pes-Na 0.001 N repeatedly in succes-
sion, the streaming potential measured should be roug-
hly identical. Depending on the instrument, the
streaming potential is generally around -1400 mV ±200
mV.
If the cell is used very frequently, this value will diminish
over time due to wear. This does not affect titration
results.
However, if the streaming potential suddenly drops by
several 100 mV from one measurement to the next, the
measuring cell is probably soiled. To avoid measuring
errors, clean the cell thoroughly (see chapter 7.1.2
"Cleaning the measuring cell", page 53).
7.2.4.1 Electrostatic charging of the measuring cell
When the mV signal remains extremely stable during
the titration process and you are in doubt if the Mütek™
PCD-05 receives a signal from the measuring cell, test
the instrument functionality as follows:
Switch on the motor and rub your hand quickly up and
down on the outside of the cell. This causes the signal
to bounce. If no such reaction is observed although the
motor is running, there is probably an electronics failure.
In this case please contact the Service Department of
BTG Instruments or your local agent of BTG Instru-
ments .
7.2.5
Functional testing of the pH electrode
Before starting a test series, measure a buffer solution
by means of the pH electrode which should respond wit-
hin 10-30 seconds. If it does not, clean and re-calibrate
the electrode. If the fault persists, replace the pH elec-
trode.
The pH-electrode is a consumable goods.
Its life time is guaranteed approximately 6 months.
Adjust new factor ?
