Lutron Electronics PE-21 Manuel utilisateur

Industrial in line and field application, professional

pH ELECTRODE

Model : PE-21

Your purchase of this

Industrial pH electrode

marks a step forward for

you into the field of

precision measurement.

Althou

h this pH

electrode is a complex

and delicate unit, its

durable structure will

allow many years of use

if proper operatin

techniques are

developed. Please read

the followin

instructions carefully

and always keep this

manual within easy

reach.

OPERATION MANUAL

TABLE OF CONTENTS

1. SPECIFICATIONS......................................................1

2. BODY THREAD SIZE..................................................1

3. ELECTRODE STORAGE.............................................. 2

4. HELPFUL OPERATING TECHNIQUES...........................2

5. CALIBRATION AND MEASUREMENTS.........................

6. ELECTRODE CLEANING.............................................4

7. RECONDITIONING....................................................5

1. SPECIFICATIONS

Features Professional and heavy duty

industrial in line pH electrode,

available for the field pH monitor

application.

Measuring Range 0 to 14 pH

Operation Temp. 0 to 95 ( 32 to 203 )℃℉

Electrode Structure Combination type.

Zero Potential for 7 ± 1 pH

pH Value

Pressure rating 6 bar max.

for the electrode

Body Material PPS

Connector BNC

Body Thread Size 3/4" NPT

Weight 250 g/0.55 LB.

Dimensions Body length : 177.5 mm

Body Dia. : 26.5 mm

Cable length : 5 meters

Applications Water conditioning, aquariums,

beverage, fish hatcheries, food

processing, photography, laboratory,

paper industry, plating industry,

quality control, school & college,

water conditioning.

2. BODY THREAD SIZE

26.5mm

3/4" NPT

3. ELECTRODE STORAGE

When pH readings are made infrequently, for example,

several days or weeks apart, the electrode can be stored

simply by replacing it in its soaker bottle. First, slide the

cap onto the electrode, then insert the electrode into the

bottle and firmly tighten the cap. If the solution in the

soaker bottle is missing, fill the bottle with pH 4 buffer.

Soaker bottle

( Electrode protection bottle )

4. HELPFUL OPERATING TECHNIQUES

1)The electrode is shipped in a plastic bottle containing a

solution of 4 buffer and potassium chloride. The

electrode should remain in the bottle until it is used. If

the electrode is used infrequently the bottle and its

solution should be saved and the electrode stored in it

(see the Electrode Storage Section).

2)During shipment the air bubble in the electrode's stem

may move into the bulb area. If bubbles are seen in the

bulb area, hold the electrode by its top cap and shake

downwards as is done with a clinical thermometer.

3)Vigorously stir the electrode in the sample, buffer or rinse

solution. This action will bring solution to the electrode's

surface more quickly and improve speed of response.

4)After exposure to a sample, buffer or rinse solution,

shake the electrode with a snap motion to remove

residual drops of solution. This action will minimize

contamination from carryover.

5)As a rinse solution, use a part of the next sample or buffer

which is to be measured. This action also will minimize

contamination from carryover.

6)When calibrating, use a buffer close in value to that

expected from the sample. This action will minimize span

errors.

7)Keep buffers and samples at the same temperature. This

action will eliminate the need to correct values for

temperature effects.

8)pH readings stabilize faster in some solutions than others;

allow time for the reading to stabilize. In general, buffers

provide stable readings in several seconds (tris buffers

take somewhat longer) while samples usually take longer

times.

9)Keep in mind that all pH electrodes age with time. Aging

is characterized by shortened span and slower speed of

response. If the meter has a manual or microprocessor

slope (span) control, the control can be adjusted to

compensate for electrode span errors ( but will not effect

the speed of response ). Aging is best detected by

calibrating the electrode in, for example, 7 buffer, then

rinsing and placing the electrode in 4 buffer. As a rule, if

the span is 10 % or more in error (a reading of 4.3 or

higher for this example) the electrode should be cleaned and

retested (see the Electrode Cleaning Section) or

reconditioned ( see the Reconditioning Section ).

If performance is not restored the electrode should be

replaced.

5. CALIBRATION AND MEASUREMENTS

As a rule, follow the procedures recommended by the pH

Meter manufacturer keeping in mind the Helpful Operating

Techniques given above. The frequency of calibration is a

function of the electrode, the pH meter and the solutions

the electro measurements :

1)Remove the electrode form its soaker bottle and save the

bottle.

2)Vigorously stir the electrode in a rinse solution.

3)Shake the electrode with a snap action to remove residual

drops of solution.

4)Vigorously stir the electrode in the buffer or sample and

allow the electrode to rest against the beaker's wall.

5)Allow the reading to stabilize and then take the reading.

6)Repeat these steps for each sample or buffer determination.

7)Between readings place the electrode In a beaker

containing about 2 cm (1 inch) of, preferably, pH 4 buffer or

distilled water.

6. ELECTRODE CLEANING

Coating of the pH bulb can lead to erroneous readings

including shortened span. The type of coating will determine

the cleaning technique. Soft coatings can be removed by

vigorous stirring or by use of a squirt bottle. Organic

chemical or hard coatings should be chemically removed.

Only in extreme cases should the bulb me mechanically

cleaned as abrasion can lead to permanent damage. If

cleaning does not restore performance, reconditioning may

be tried.

7. RECONDITIONING

When reconditioning is required due to electrode aging (see

Helpful Operating Techniques, Part 9), the following

chemical treatments can be tried. They are presented in the

order of the severity of their attack on the pH glass and may

not improve ( and in some case actually further deteriorate )

electrode performance.

Note :

Use proper precautions when handling these

hazardous chemicals. Ammonium bifluoride and HF

(hydrofluoric acid) are extremely hazardous and

should only be used by qualified personnel.

1)Immerse the electrode tip in 0.1N HCL for 15 seconds,

rinse in tap water and then immerse tip in 0.1N NaOH

for is seconds and rinse in tap water. Repeat this

sequence three times and then recheck the electrode

performance. If performance has not been restored, try

Step 2.

2)Immerse the tip in a 20% solution of NH4F.HF

(ammonium bifluoride) for 2 or 3 minutes, rinse in tap

water and recheck performance. If performance has not

been restored, try Step 3.

3)Immerse electrode tip in 5% HF for 10 to 15 seconds,

rinse well in tap water, quickly rinse in 5N HCL, rinse well

in tap water and recheck performance. If performance

has not been restored it is time to get another epoxy

body, sealed reference combination pH electrode.

50701-PE21

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