YSI 4210 ORP User Manual

OPERATIONS MANUAL

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4210

ORP ELECTRODE

4210

For the most recent version of the manual, please visit www.ysi.com.

Contact YSI

1725 Brannum Lane
Yellow Springs, OH 45387 USA
Tel: [phone]

800-765-4974
Email: [e-mail]
Internet: www.ysi.com

Copyright © 2013 Xylem Inc.

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4210 General information

General information

Automatic sensor

recognition

The sensor electronics with the stored sensor data is in the connecting head
of the electrode. The data include, among other things, the sensor type and
series number. The data is recalled by the meter when the sensor is
connected and is used for measurement and for measured value documen­tation.

The digital transmission technique guarantees the failure-free communi­cation with the meter even with long connection cables. If the sensor firmware
is enhanced by YSI, it can be updated via the meter.

Technical data

General data Reference electrolyte 3 mol/l KCl, Ag+free

Junction Ceramic

Measurement and

application

characteristics

Electrode material and
shape

mV measuring range - 1250.0 ... + 1250.0

Allowed temperature range 0 ... 100 °C (32 ... 212 °F)

Typical application Laboratory

Platinum / circle

Shaft dimensions,

material, electrical

connection

Connection cable Length 1.5 m

Accuracy of the

IDS measuring

technique

Shaft length 120 mm

Shaft diameter 12 mm

Shaft material Glass

Combination electrode con­nection

Meter connection Digital plug

Diameter 4.3 mm

Smallest allowed bend
radius

Plug type Socket, 4 pins

Measured parameter Accuracy (± 1 digit)

U [mV] ± 0.2

Fixed cable

Fixed installation: 20 mm
Flexible use: 60 mm

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Commissioning, measuring, checking 4210

Refilling
opening

Commissioning, measuring, checking

Note

For ORP electrodes with platinum electrode, please follow the instructions in
section A

Commissioning Prepare the electrode for measuring as follows:

 Open the refilling opening for the reference electrolyte solution. Depend-

ing on the model, the stopper of the refilling opening is an elastomer stop­per or a slider.

The refilling opening must always be open during measurement!

CTIVATING PLATINUM ELECTRODES.

General rules for

measuring

 Remove the watering cap from the electrode tip. Possible salt deposits in

the area of the watering cap do not affect the measuring characteristics
and can easily be removed with deionized water.

Note

Please keep the watering cap. It is required for the electrode to be stored.
Always keep the watering cap clean.

 Connect the combination electrode to the meter.

 Measure with the electrode according to the operating manual of the meter

and observe the following rules while doing so:

 Make sure the refilling opening for the reference electrolyte solution is

open.

 Avoid the carryover of sample solution from one measurement to the next

as follows:

– Shortly rinse the sample beakers with the solution the beakers are to

be filled with next.

– Between measurements, rinse the electrode with the solution that fol-

lows. Alternatively, you can also rinse the electrode with deionized wa­ter and then carefully dab it dry.

 Immerse the electrode in the solution in a vertical or slightly tilted position.

4

 Make sure the immersion depth is correct. The junction must be complete-

ly submersed in the solution. The junction is in the area of the bottom end
of the shaft (see arrow).

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4210 Commissioning, measuring, checking

4210

At the same time, the level of the reference electrolyte must be at least 2
cm above the level of the solution.

Conversion to

normal hydrogen

electrode

T (°C) T (°F) U

0 32 +224 35 95 +200

5 41 [phone] +196

10 50 [phone] +192

15 59 [phone] +188

U

= U

H

with: U

Meas

H

U

Meas

U

Ref

+ U

Ref

= ORP, referring to the normal hydrogen electrode

= Measured ORP

= Voltage of the reference system compared to the normal

hydrogen electrode

U

is temperature dependent and can be taken from the following table (see

Ref

also DIN 38404-6):

[mV] T (°C) T (°F) U

Ref

Ref

[mV]

4210 4210

20 68 [phone] +184

25 77 [phone] +180

30 86 +203

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Commissioning, measuring, checking 4210

Checking with

Zobell ORP buffer

solution (YSI 3682)

U is temperature dependent and can be taken from the following table:

T (°C) U [mV] T (°C) U [mV]

4210 4210

0 +262 30 +214

5 +254 35 +206

10 +246 40 +199

15 +238 45 +191

20 +230 50 +183

25 +222

6

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4210 Aging

Storage

During short

measuring breaks

Overnight or

longer

Immerse the electrode in the reference electrolyte with the refilling opening
open.

Electrode Reference electrolyte Model

(see page 10)

+

4210 3 mol/l KCl, Ag

Prior to the next measurement, shortly rinse the electrode with the test
sample or deionized water.

Insert the clean electrode into the watering cap filled with reference
electrolyte and shut the refilling opening.

Note

During longer storing periods, salt sediments may develop on the watering
cap. They do not affect the measuring characteristics and can easily be re­moved with deionized water when the electrode is put into operation again.

free KCl-250 (250 ml)

Aging

Every ORP electrode undergoes a natural aging process. Extreme operating
conditions can considerably shorten the lifetime of the electrode. These are:

 Strong acids or lyes, hydrofluoric acid, organic solvents, oils, fats, bro-

mides, sulfides, iodides, proteins

 High temperatures

 High changes in pH and temperature.

The warranty does not cover failure caused by measuring conditions and
mechanical damage.

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Aging 4210

Maintenance and cleaning

During operation, a small amount of reference electrolyte leaks through the
junction from the electrode into the test sample. If the level of reference
electrolyte becomes too low with time, refill it through the refilling opening.

Refilling the

reference

electrolyte

Refilling is very easy using a dropping bottle. Proceed as follows:

 Cut off the tip of the dropping bottle at a right angle until the opening in the

tip can be seen

 Open the refilling opening of the electrode

 Press the tip of the dropping bottle into the refilling opening while turning

it slightly

 Pump several small quantities of the reference electrolyte into the stem

using the dropper bottle

 Pull the dropping bottle out of the refilling opening while turning it slightly

as necessary.

8

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4210 Activating platinum electrodes

1000

800

600

400

200

20481012146

0

pH value

U

H

in mV

oxidizing pretreatment

reducing pretreatment

Cleaning Remove water-soluble contamination by rinsing with deionized water. Re-

move other contamination as follows:

Contamination Cleaning procedure

Fat and oil Rinse with water containing household wash-

ing-up liquid

Lime and hydroxide deposits Rinse with citric acid (10 % by weight)

After cleaning Rinse the electrode with deionized water.

Activating platinum electrodes

First-time

activation during

installation and as

required

Activation during

very long set-up

times

For first-time activation use the activation powder from the SORT/RH reagent
set (component of the SORT/RH reagent set). Immerse the moist (but not
dripping) platinum electrode into the activation powder and rotate the
electrode several times in the powder. Then remove the activation powder
under flowing water with a soft brush (e.g. toothbrush).

When changing from oxidizing to reducing test solutions and vice versa this
can result in set-up times that can take significantly more than an hour. In this
case pretreatment (activation) of the platinum surface can shorten the set-up
time. The type of pretreatment (reducing or oxidizing) is based on the pH val­ue and the ORP voltage (U

) of the test solution where the latter must be es-

H

timated for the first measurement.

The type of pretreatment can then be determined using the following diagram
where U

is based on the normal hydrogen electrode:

H

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Wear parts and accessories 4210

Oxidizing pretreat­ment

Immerse the platinum electrode for two to three
days in a sulfuric acid clorina solution (0,5 g clorina
powder, 100 ml H

O dist., 2-3 ml 20% sulfuric acid).

2

Clorina powder for producing the solution is includ­ed in the SORT/RH reagent set.

The diaphragm must not be immersed in the

Note:
clorina solution!

Reducing pretreat­ment

When the electrode is ready for the test immerse it
in the Zobell ORP buffer solution and wait for a sta­ble measured value.

Wear parts and accessories

Description Model Order no.

Reference electrolyte solution 3 mol/l KCl,

+

free (250 ml)

Ag

Reagent set for regenerating ORP platinum
electrodes, consisting of 10 g activation pow­der and 30 g clorina powder

KCl-250 109 705Y

SORT/RH 109 730Y

Zobell ORP buffer solution (125 ml) 3682 061320

10

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4210 Contact Information

Contact Information

Ordering & Technical Support

Telephone

Fax

: [phone]

Email

Mail: YSI Incorporated

Internet

When placing an order please have the following information available:

YSI account number (if available) Name and Phone Number
Model number or brief description Billing and shipping address
Quantity Purchase Order or Credit Card

: [phone]

[phone]
Monday through Friday, 8:00 AM to 5:00 PM ET

: [e-mail]

1725 Brannum Lane
Yellow Springs, OH 45387
USA

: www.ysi.com

Service Information

YSI has authorized service centers throughout the United States and
Internationally. For the nearest service center information, please visit

www.ysi.com

directly at 800-897-4151.

When returning a product for service, include the Product Return form
with cleaning certification. The form must be completely filled out for an
YSI Service Center to accept the instrument for service. The Product
Return form may be downloaded at www.ysi.com
‘Support‘ tab.

and click ‘Support’ or contact YSI Technical Support

and clicking on the

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Contact Information 4210

12

ba76138d01 02/2013

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YSI
1725 Brannum Lane
Yellow Springs, OH 45387
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.ysi.com

©Xylem Inc