Extech Instruments 34135-A Manual de usuario

Version 1.5 August 2001

User's Guide

Oyster pH - Conductivity - TDS - Temperature Meters

Models

34135-A

341350

341350-P

34145A

341450

341450-P

INTRODUCTION

Congratulations on your purchase of the Extech's Oyster Series meter or meter kit. These

devices measure pH/Conductivity plus TDS or Temperature. These meters are intended for

routine laboratory and field testing. Accurate measurements are provided in a battery

operated, portable meter with a hinged display that can be adjusted to any viewing angle.

Model 34135-A measures pH, Conductivity and TDS. The ‘A’ indicates ‘meter-only’.

Models 341350 and 341350-P are kits which include the 34135A and all the necessary

accessories. The ‘P’ indicates Polymer type electrode (341350 has glass electrode).

Model 34145-A measures pH, Conductivity & Temperature. ‘A’ indicates ‘meter-only’.

Models 341450 and 341450-P are kits which include the 34145A and all the necessary

accessories. The ‘P’ indicates Polymer type electrode (341450 has glass electrode).

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 341350 Product Page

Version 1.5 August 2001

SPECIFICATIONS

Range (resolution) Accuracy

Conductivity 10 - 19,990µS (10µS) ± 0.5%

Temperature (34145-A only) -30 to 105oC ± 0.50C

pH 0.00 to 14.00pH (0.01pH) ± 0.02pH

TDS (34135-A only) 10 - 19,990ppm (10ppm) ± 0.5%

Auto/Manual Temperature

Compensation

Manual for pH/Auto for conductivity/TDS; 0-100oC;

Correction: 2% per oC

Power 9V battery or optional AC adapter

Display 3-1/2 Digit LCD (90 to 180oadjustable viewing angle)

Overrange Indication Automatic (1---) on all ranges

Low Battery Indication Automatic

Dimensions/Weight 3.75 x 4.25 x 2" (96 x 108 x 45mm) / 12 oz (340g)

Accessories supplied 9V battery, plus:

341350 kit pH electrode, pH buffers, bottle, case, glass

conductivity cell

341350-P pH electrode, pH buffers, bottle, case, polymer

conductivity cell

341450 kit pH electrode, pH buffers, bottle, case, glass

conductivity cell, stainless steel temperature probe

341450-P pH electrode, pH buffers, bottle, case, polymer

conductivity cell, stainless steel temperature probe

METER DESCRIPTION

1. LCD display

2. Battery compartment

3. AC adapter input

4. Electrode and Temperature

probe input jacks

5. Electrode

6. Neck-strap fasteners

7. Function keys

Version 1.5 August 2001

OPERATING INSTRUCTIONS

pH Calibration

1. Calibrate the meter and electrode before each use to ensure accuracy.

2. Connect the pH electrode via the BNC connector to the meter.

3. Open the meter to the fully extended position. Open the battery cover and install a 9V

battery. Replace the cover and turn the unit ON. The LCD indication should appear.

4. Slide the SELECT switch to pH

5. Adjust the TEMP oC knob to approximate the solution temperature.

6. Remove the wetting cap from the tip of the electrode. Rinse in de-ionized water, blot

dry and place the electrode in a 7.00 pH buffer solution. Allow to stand for

approximately one minute or until the display stabilizes.

7. Adjust the CALIB knob until the display reads 7.00.

8. Remove the electrode from the buffer and rinse it in distilled water and blot dry. Place

the electrode in a 4 or 10 pH buffer solution and allow to stand for approximately 1

minute or until the display stabilizes.

9. Adjust the SLOPE knob until the display reads 4.00 or 10.00 (as required).

10. Repeat steps 6 through 9 until no further adjustment is necessary.

pH Measurement

1. Place the electrode in the sample solution and read the pH value on the LCD.

2. When all measurements have been taken, unplug the electrode or cell and rinse in

distilled water, shake and store as described below.

Conductivity / TDS Calibration

The conductivity cell calibration should be performed frequently to ensure accuracy.

1. Connect the conductivity cell to the input socket on the side of the meter.

2. Prepare a conductivity solution of approximately the same value as the solution to be

measured. The solution should be prepared at 250C.

3. Set the meter to the uS/cm or TDS mode.

4. Place the cell in calibration solution and allow the reading to stabilize.

5. Adjust the Cell knob until the display reads the value of the calibration solution.

Example: For a 12560uS/cm conductivity solution the display will read 1256. The

user must multiply the reading x 10.

Conductivity/TDS Measurements (Multiply readings by 10)

1. Place the electrode in the sample solution.

2. When finished, unplug the electrode or cell and rinse in distilled water.

Temperature Measurement (34145-A only)

1. Set the mode switch to Temperature.

2. Connect the temperature probe to the meter via the meter’s phone jack.

3. The LCD will indicate the temperature in oC.

4. Immerse the probe at least 1/3 of the way below the surface of the solution.

5. Allow enough time for the electrode to reach the sample’s temperature.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Version 1.5 August 2001

Care of the Conductivity/TDS Cell

To prepare the cell, remove any outer protective sheath that may be used in shipping.

1. Cell Storage

On sheathed cells, replace the sheath over the cell when storing. For non-sheathed

versions, soak the cell tip in de-ionized water for storage.

2. Cell Cleaning

After each use, the cell tip should be rinsed with de-ionized water. If solids build up

inside the cell carefully remove with a cotton swab soaked in solvent taking care not

to touch the metal parts of the inner cell.

3. Internal Cell Elements

Two platinum plates reside on the inner cell wall. These plates should be a uniform

black color. If blemishes and scratches appear on these plates, the cell may need

repair. If this occurs, it is suggested that the cell be returned for evaluation.

Care of the pH Electrode

1. The 60120B pH electrode is recessed in the polymer body allowing it to rest against

the bottom of a beaker without damage the glass bulb. This eliminates the need for

electrode holders and allows the probe to be used as a stirring rod. The sealed

reference design eliminates the need for filling solutions (minimizes "dry-out"). Up to

100 psig systems can be accommodated without external pressurization.

2. The Electrode should remain in its bottle or cap until used. Afterwards, store the

Electrode in its bottle. Use a pH 4 buffer solution or tap water as the storage medium.

3. If bubbles are seen in the bulb area, hold the electrode by its cap and shake

downwards until bubbles are removed.

4. To improve speed of response, vigorously stir the electrode in the sample, buffer, or

rinse solution.

5. After exposure to a sample, buffer, or rinse solution, shake the electrode with a snap

motion to remove residual drops of solution.

6. Use part of the next sample/buffer to be measured as a rinse solution, when possible.

7. When calibrating, use a buffer as close as possible to the expected pH of the sample.

8. Keep buffers and samples at the same temperature to avoid temperature effects.

9. pH readings stabilize faster in some solutions than others; allow time to stabilize.

10. Electrodes deteriorate over time. If accuracy falls to 10% the electrode should be

cleaned or replaced. If no improvement is observed, replace the electrode at once.

Electrode Storage

The electrode can be stored in the soaker bottle or wetting cap. For the storage bottle,

slide the cover onto the electrode, replace the O-ring, and insert electrode into bottle firmly

tightening the cap. Ensure that the bottle or cap is filled with a pH 4 buffer or tap water.

Electrode Cleaning

The type of electrode coating which occurs over time will determine the cleaning method.

Soft coatings can be removed by vigorous stirring or by the use of a squirt bottle. Organic

chemical (hard coatings) should be chemically removed. Only in extreme cases should the

bulb be cleaned mechanically.

Version 1.5 August 2001

pH Troubleshooting Chart

Symptom Cause Recommended Solution

Clogged Junction Soak in 4.07 M KCL @ 60oC for 30

minutes

Strong Alkaline measurement

Deteriorated Gel layer

Soak in 0.1 M HCL overnight

Protein coating on electrode

surface

Soak in 1 gm Pepsin dissolved in

100ml of 0.1 m HCL for 30 minutes or

as needed

Oil, paint, dyes, suspended solids

on sensor

Rinse electrode alternately with

materials solvent then buffer 7.00

Organic solvents are coating

sensor

Long response

time or reading

drift

Dehydrated membrane

Organic mole fraction has to be less

than 50% to assure reasonable

readings. Limit time of measurement.

Keep probe in the 7.0 buffer between

readings.

Dry Bulb Long term storage without wetting Soak electrode tip in wetting cap filled

with 1ml 7.00 buffer for 24 to 48 hours

Static Charge Wiping electrodes Rinse electrode in 7.0 buffer and blot.

Do no wipe electrode.

Same readings in

different buffers

and samples

Cracked or broken bulb Replace electrode. Use bulb guard.

Avoid plunging electrode to bottom of

container and spinning bars. A

wetting cap will protect bulb between

measurements.

Erratic LCD

display

Samples have low ionic strength

(lacks salt); e.g. distilled, de-

ionized, boiled, lake water (high

pressure)

For each 50 ml of sample add 1 drop

(50uL) of SAT.KCL No alteration in

pH will occur by inert KCL.

MAINTENANCE

Conductivity Cell Simulator

The meter is supplied with a cell simulator which can be used in place of the conductivity

cell to provide a means to verify the operation of the meter. The simulator will produce a

reading of approximately 800 - 1200uS (~1mS). The simulator should not be used as a

calibration device.

This device is helpful in determining if the cause of calibration difficulties is related to the

meter or (more likely) an aged or defective conductivity cell.

Battery Replacement

Install a new battery when the LOW BATTERY indication appears on the LCD. Remove

the battery cover (refer to Fig. 1 for location), install new battery, and replace cover.

Calibration / Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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