Hach Lange CL17, Instrument Manual

Page: 52 / 74

Page 50
Unscheduled Maintenance
54400_maintain.fm
Section 3
VORSICHT
Die in diesem Verfahren verwendeten Chemikalien können bei unsachgemäßer
Handhabung und versehentlichem Mißbrauch gefährlich sein. Bitte alle
Warnungen auf den Reagenz-Etiketten Iesen. Es wird empfohlen, in allen
Situationen, in denen mit einem Kontakt mit Chemikalien zu rechnen ist, eine
Schutzbrille zu tragen.
CUIDADO
OS produtos químicos usados neste processo podem ser perigosos se
manuseados inapropriadamente ou usados acidentalmente de forma indevida.
Leia todos os avisos de precauçao contidos nos rótulos de reagentes. Se
recomenda sempre o uso de protetores para olhos, quando possa acontecer
contato com os produtos químicos.
Clean the colorimeter cell as follows:
1. Press the
MENU
key, then press the down
ARROW
key until the
MAINT
menu appears. Press
ENTER
.
2. Press the down
ARROW
key to scroll to the
CLEAN
option. Press
ENTER
.
3. Refer to Figure 20 and locate the colorimeter.
4. Remove the rubber plug on the top of the colorimeter assembly.
5. Remove the magnetic stir bar using a bent steel paper clip as a retrieval
tool. See
Figure 20 .
6. Wait until
CLEAN
flashes on the status line of the display, then fill
the colorimeter with 19.2 N Sulfuric Acid Standard Solution
(Cat. No. 2038-32).
Note: Lower normality sulfuric acid will NOT be sufficient for cleaning the colorimeter.
7. Allow the sulfuric acid to stand in the colorimeter for 15 minutes.
8. Insert a wooden or paper cotton-tipped swab* into the opening and move
it up and down with a gentle scrubbing action, cleaning the interior
surfaces of the colorimeter cell. Refer to
Figure 21 . Clean the stir bar with
the cotton swab.
9. Reinstall the stir bar.
10. Replace the rubber plug on the top of the colorimeter assembly and make
sure the cover is on the viewing port of the colorimeter.
11. Press the
EXIT
key to immediately return to normal operation; the
instrument will return to normal operation automatically after 60 minutes.
* Do not use a plastic swab when cleaning the colorimeter with sulfuric acid, the acid will dissolve the plastic.