DO Electrode (9520-10D) Operation Manual
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Thank you for purchasing a HORIBA DO electrode.
Read this Operation Manual carefully before using the electrode.
© Copyright HORIBA, Ltd. 1997
1
Cautions during handling
Ref erence Only
• The D-20 Series of pH meters can be used in combination with this electrode to provide water-resistant construction (conforming to IP-67). When
measuring, do no! immerse lhe cap, lead or connector in the sample.
• Do no! allow lhe electrode to come in contact with any hard surface.
• An extremely thin membrane is stretched across lhe DO tip and DO responsive par!. DO no! allow lhe membrane to come in contact with any hard
surface and do no! exert undue force on lhe membrane.
• The internai solution of lhe DO tip is a strong alkaline. lf lhe internai solution comes in contact with your clothes or skin, flush immediately with water.
lf lhe internai solution comes in contact with your eyes, flush immediately with large amounts of water and seek treatment by a physician.
• When attaching lhe DO tip to lhe electrode body, check to make sure that lhe O-ring is attached. Attach lhe DO tip securely to lhe electrode body.
• The electrode connector requires a high degree of insulation. Do no! allow lhe connector to come in contact with water or dirty hands.
• DO tips that are no longer usable should be disposed of as industrial waste.
2
Contents
• Electrode body
• DO tip (#7541)
• Sensor adapter (common taper fit for$ 19)
1 pc.
1 pc.
1 pc.
1 pc.
1 pc.
• Stirrer
• Stirrer casing
• Operation Manual
1 copy
3
Specifications and names of parts
• Model: 9520-10D
Specifi
cations
Names
of parts
Measurement principies
Measurement range
Usable temp. range
Wetted materiais
Dimensions:
Electrode length
Ext. diam. of wetted par!
Lead length
Stirr
¼
er
cas1ng
O-ring
DO tip
(#7541)
Stirrer
Membrane galvanic cell
O - 19.99 mg/1
O - 45 ºC
PVC, POM, epoxy, FEP, CR, silicon
rubber
190 mm (incl. cap)
15 m
1 m
Electrode
connector
onector
4
pin
Cap
Membrane
Preparations
4.1 Connecting to pH meter
1 Inser! lhe electrode connector
into the connector por! sleeve
on lhe meter, after aligning with
lhe pin. Do not inseri lhe con
nector unless it is aligned prop··
erly with lhe connector port.
C2
2
Press lhe electrode connector
into lhe connector por! on lhe
meter, while turning the connec
tor to lhe right.
3 Slide lhe connector cover over
lhe connector. Then, screw lhe
cover to lhe right until is comes
in light contact with lhe meter
case.
4
Inseri lhe temperature connec
tor into the jack on lhe meter. In
ser! lhe connector firmly, until
lhe O-ring on lhe connector can
no longer be seen.
Note
►►►
With a D-25 pH meter, lhe C2 and T2 connectors are used
for lhe DO electrode. The C1 and T1 connectors are re
served for pH or ORP electrodes, only.
4.2 Preparing electrode
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Caution
Chemical solution
Highly concentrated potassium hydroxide (KOH) is
used in lhe internai solution of lhe electrode.
lf the internai solution in lhe electrode comes in con
tact with your hands or skin, wash immediately with
water. lf lhe internai soluti.on comes in contact with
your eyes, flush immediately with large amounts of
water and seek treatment by a physician.
• The sensor adapter is used to make lhe container being used air-tight
during BOD measurement, when it is extremely important that lhe sam
ple contained in a furan bottle during measurement not absorb any oxy
gen from lhe air, or when storing a DO electrode in zero sample solution
inside a conical flask.
1 Attach lhe sensor adapter to lhe
electrode body.
-�
Electrode
body
Sensor
adapter
2
Remove the DO tip (#7541)
from its packaging.
Note
►►►
An O-ring is attached inside lhe sensor adapter, so push
lhe sensor adapter in with a litlle force, while turning it.
3 Remove the DO tip short sock
et.
Short
socket
5
Put lhe stirrer into lhe stirrer
casing.
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#
Stirrer
�Uccec oasióg
4
Push lhe DO tip securely into
the electrode body, to attach it.
DO tip
Electrode
body
6 Put lhe stirrer casing onto lhe
DO tip, so that it clicks into
place.
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� Stirrer casing
Note
►►►
Do not dispose of the short socket that was removed. li is
necessary when storing lhe electrode.
Note
►►►
When attaching lhe DO tip to lhe electrode body, make
sure that lhe O-ring is attached to lhe DO tip.
5
Points to remember when measuring
(calibrating)
• Air calibration
• Remove any drops of liquids from lhe membrane ai lhe tip of
lhe DO electrode, by wiping away lhe liquid with soft tissue
paper or similar material to make it dry.
• Avoid calibrating in places with extreme temperature fluctuation,
places exposed to the wind or rain, and places near heating
equipment.
• Do not grasp lhe holder during or immediately before/after cal
ibration. (Body temperature adversely affects lhe stability of lhe
readings.)
Note
►►►
Equalizing lhe temperatures of lhe DO electrode and lhe air
is important in achieving proper air-calibration. lf possible,
allow the DO electrode to sit in lhe open air for a short time
(approx. 20 minutes) prior to calibration.
• Standard solution calibration and sample
measurement
• Wash lhe electrode in pure (ion exchange) or tap water and dry
it with filter or tissue paper, each time prior to immersing it in lhe
solution.
• When immersing lhe electrode in lhe solution, be sure that lhe
temperature sensor is completely immersed.
• S!ir lhe DO electrode around in lhe solution, so that lhe temper
ature of lhe electrode becomes lhe sarne as that of the solution.
• Make sure lhe membrane has no dirt or air bubbles on it.
• Measure lhe DO of the solution, making sure lhe flow speed on
lhe surface of lhe membrane is constant.
• lmmerse lhe electrode into lhe
solution at an angle, so air
bubbles do not cling to lhe DO
tip membrane.
• Start lhe stirrer, setting it for
approx. 1,000 rpm or more to
stabilize lhe DO meter reading.
Temp. sensor
Stirrer
6
Maintenance
• After finishing measurement, wash lhe DO electrode well in
pure (ion exchange) water, then keep it immersed in a conical
flask containing zero standard solution (approx. 5% sodium
sulfite solution). Leave lhe electrode connected to lhe meter.
Note
►►►
lf lhe electrode is stored for a long period of time without
being connected to lhe pH meter, it may be difficult to stabi
lize lhe reading when preparing for to make measurements.
1
Wash lhe DO electrode well
2
lmmerse lhe electrode in a coni-
with pure (ion exchange) water.
cal flask containing zero stan
dard solution (approx. 5% so
dium sulfite solution).
Membrane
Sensor
adapter
Zero standard
solution
• lf the electrode membrane is dirty, clean it by using soft cotton gauze ,
using care not to scratch lhe membrane. Then, rinse lhe membrane with
pure (ion exchange) water.
• lf an errar occurs during calibration, replace lhe DO tip.
Note
►►►
As a DO electrode is used, white sedimentation may devel
op in lhe internai solution of the DO tip. This does no! affect
performance.
7
Storage
• The electrode should, as a principie, be stored while remaining con
nected to lhe meter.
• To store lhe electrode without the pH meter, follow lhe below procedure.
1 Remove lhe electrode from lhe
connector on lhe meter.
3
Remove lhe DO tip from lhe
electrode body.
�-@;
DO tip
Electrode body
2
Wash lhe electrode well with
pure (ion exchange) water, then
dry it with cotton gauze.
4
Screw lhe short socket onto lhe
DO tip, then store it in a coai,
dark location.
Note
►►►
Avoid storing lhe electrode in a hot place or places with
high humidity. Store lhe electrode indoors, out of direct
sunlight.
* "DO" is an abbrebiation of Dissolved Oxygen.
Technical questions regarding this product should be directed
to lhe following HORIBA Customer Support Center.
Call toll free (in Japan): 0120 - 37 - 6045
Hours: 9:00 a.m .. - 5:00 p.m., Mon. - Fri.
HORIBA, Ltd.
Distributed by:
ABQ Industrial LP USA
Tel:
+1 (281) 516-9292 / (888) 275-5772
eFax:
+1 (866) 234-0451
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