Extech Instruments Oyster-10 Manual de usuario

User Manual

Oyster-10 pH/mV/Temperature Meter

Introduction

Congratulations on your purchase of Extech's Oyster Series splash-proof meter. This

microprocessor-based device with tactile buttons simultaneously displays pH or mV and

Temperature (oC/oF selectable). 25 labeled readings can be conveniently stored for later

recall. The Oyster 10 is battery operated, portable, and includes a hinged display that

can be adjusted to any viewing angle. In addition, the neck-strap offers hands-free

operation. Advanced features include diagnostic displays, MIN/MAX readings, audible

alerts, 5-point buffer recognition, & Auto/Manual temperature compensation. This meter

is shipped fully tested and calibrated and, with proper use, will provide years of reliable

service.

Oyster-10, V1.811/07

Specifications

Range (Resolution) Accuracy

mV ± 1000 mV DC (1 mV) +2mV

Temperature 32.0 to 212.0oF (0.0 to 99.9oC) + 0.8oF (0.5oC)

pH 0.00 to 14.00pH (0.01pH) +0.02pH

Temperature Compensation 32 to 212oF (0-100oC) AUTO or MANUAL modes

Power 9 volt battery or optional AC adapter

Display Dual LCD display for simultaneous pH or mV and

temperature readings. LCD viewing angle: 90oto 180o

Over-range Indication Displays " ---- "

Power 9 volt battery or optional AC adapter

Auto Power OFF After 10 minutes of inactivity

Low Battery Indication Battery icon appears on LCD

Operating Temperature 41ºF to 104ºF (5ºC to 40ºC)

Storage Temperature - 4oF to 140oF (-20oC to 60oC)

Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50%

at 104ºF (40ºC)

Storage Humidity <80%

Operating Altitude 7000ft. (2000meters) maximum

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

Meter Description

1. LCD Display

2. Battery compartment (9V battery)

3. Function buttons (Power, Up/Down, Max/Min, pH/mV, Store/Recall)

4. AC Adapter input (117VAC)

5. RTD Temperature probe input (3.5mm phono jack)

6. BNC style pH/mV electrode input

7. Neckstrap loop (2)

Oyster-10, V1.811/07

pH Overview

pH is a unit of measure (ranging from 0 to 14pH) indicating the degree of acidity or

alkalinity of a solution. pH tests are the most commonly performed measurements in water

analysis, using the hydrogen ion activity of a solution to determine acidity or alkalinity.

Solutions with a pH less than 7 are considered acidic, solutions with a pH higher than 7 are

known as bases, and solutions with a pH of exactly 7 are considered neutral.

The pH scale is logarithmic, so, for example, if sample A is 1 pH less than Sample B, this

means that Sample A is 10 times more acidic then Sample B. A difference of 1 pH

represents a ten-fold difference in acidity.

ORP/REDOX Overview

ORP stands for Oxidation Reduction Potential and represents the oxidizing or reducing

nature of a solution. The overall “reactive” tendency of a solution can be determined from

ORP measurements. ORP testing is becoming more common in waste-water and water

treatment measurement regimens. The unit of measurement for ORP is mV.

Calibration and Operation

pH Calibration (NOTE: ORP does not require calibration)

Before accurate measurements can be obtained, it is necessary to calibrate the meter with

the electrode. Typically, pH 7 is calibrated first and then one or more of the other buffers

(shown in the left column in the table below). The meter automatically recognizes all of the

buffers listed in the table below and calibrates itself to the buffer’s pH value.

1. Connect the pH electrode to the meter’s BNC connector input.

2. Open the top half of the meter to an appropriate viewing position.

3. Power the meter with the POWER/CAL button.

4. Place the electrode into a buffer solution (4, 7, or 10).

5. Press and hold the CAL key until the CAL display icon appears.

6. During calibration, CAL is shown on the display followed by SA (saved).

7. When calibration is complete, the meter automatically displays END and returns to

normal operation mode. Repeat steps 1-5 as necessary. Note that it is not necessary

to turn the meter off and then back on again to calibration another reference.

Important calibration note: Since pH electrodes can vary in performance, this meter

includes a special feature that displays an electrode’s slope in %. For example, if two

electrodes (one new and moderately used) are calibrated in the same pH 4 solution they’ll

both display pH 4 on the meter. This is because the meter will accept one pH value for a

range of measurement values as shown in the table below (in this case, any reading

between 1.68pH and 6.50pH will be accepted as 4pH calibration). The meter then displays

the slope % for the electrode under test. If the slope % is below 75% or above 125%, the

electrode must be replaced. A slope of 100% is ideal.

pH reading Range of measurement

1.68 0.00 to 1.68

4.00 1.68 to 6.50

7.00 6.50 to 7.50

10.00 7.50 to 12.45

12.45 12.45 to 14.00

Oyster-10, V1.811/07

pH Measurement and Temperature Compensation

1. Use the pH/mV button to select the pH mode. The unit of measure appears on the

LCD.

2. Connect the pH electrode to the meter and place the sensor end in the solution under

test.

3. For automatic temperature compensation, connect the temperature probe to the meter

(display will read ATC) and place the sensor end in the solution about 1/3 of the way

below the solution surface. The temperature reading of the solution appears on the

bottom of the LCD. When the temperature of a sample differs from a buffer solution

temperature, allow enough time for the electrode to stabilize to the sample's

temperature.

4. For manual temperature compensation, a temperature sensor is not connected to the

meter (MANUAL is displayed). Adjust the meter’s temperature display with the

up/down buttons so that the displayed temperature matches the temperature of the

solution. A manual thermometer will be needed to determine the solution temperature

first.

5. To change the unit of measure for temperature (C to F or F to C), press and hold the

pH/mV button while powering the meter. The LCD reflects the unit of measure.

6. Read the pH measurement on the main display. An out of range reading is indicated by

dashes ( ----- ).

7. When the test is complete, unplug the electrode and rinse it in distilled water.

8. Place approx. 1 ml of pH 4 solution or tap water in the wetting cap before replacing it.

mV (ORP) Measurements

1. Note that calibration is not required for mV measurements.

2. Use the pH/mV button to select the mV mode. The display will reflect the unit of

measure.

3. Remove the wetting cap from the ORP electrode and connect the cable via the BNC

meter connection.

4. Rinse the ORP electrode and place it into a sample solution. When the LCD stabilizes

it will read the redox potential of the sample in millivolts.

5. When sampling is complete, unplug and rinse the electrode. Place a small portion

(1ml) of distilled water in the wetting cap. Place the cap over the electrode.

25-Reading Measurement Storage

1. Press the STORE/RECALL button to store the current reading. Press each time a

reading is to be stored.

2. If an attempt is made to store more than 25 readings, the stored readings (starting with

the first reading) will be overwritten.

3. To recall readings, press and hold the STORE/RECALL button until the ‘RECALL’ icon

appears on the LCD. Use the up/down arrow buttons to scroll through the stored

readings. Note that ‘NULL’ is displayed if there are no readings in memory.

4. To exit this mode, press and hold the STORE/RECALL button until the ‘RECALL’ icon

disappears.

5. To clear the contents of the memory press and hold the up and the down arrow

buttons while powering the meter on until the ‘CLr’ icon appears on the LCD. All 25

locations will be erased.

Note: Readings are stored in non-volatile memory (saved when the meter is turned off).

Oyster-10, V1.811/07

MAX/MIN Display

1. The meter memorizes the highest (MAX) and lowest (MIN) readings when prompted.

2. Press and hold the MAX/MIN button until both the MAX and MIN icons appear on the

LCD. The meter will now begin keeping track of the MIN and MAX readings.

3. To view MAX/MIN values, press the MAX/MIN button again; the meter automatically

displays the highest and lowest readings in succession and then returns to the

MAX/MIN recording mode.

4. To exit the MAX/MIN mode, press and hold the MAX/MIN button until the MAX and

MIN icons disappear.

5. To clear the MAX/MIN memory, cycle the meter power.

pH Electrode Model 60120B Operation

The Following information applies to the Epoxy Body, Sealed Reference Combination pH

Electrode Model 60120B.

Electrode Considerations

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

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

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

reference design eliminates the need for adding filling solutions (minimizing "dry-out")

and can be used in up to 100 psig systems without external pressurization.

2. The Electrode should remain in its bottle or cap until used.

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

downwards until bubbles disappear.

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 sample/buffer to be tested next as a rinse solution whenever 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 at various rates; allow time for readings to stabilize.

10. Electrodes deteriorate over time. If accuracy falls to 10% (slope), the electrode should

be cleaned. If no improvement is observed, replace the electrode.

Electrode Calibration and Cleaning

Refer to the earlier section ‘Calibration and Operation’ for calibration details. Refer to the

section below ‘Maintenance and Troubleshooting’ for details on electrode cleaning.

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 the bottle

firmly tightening the cap. Ensure that the bottle or cap is filled with a pH of 4 buffer solution.

Oyster-10, V1.811/07

Maintenance and Troubleshooting

Electrode Cleaning

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

Soft coatings can be removed by vigorous stirring or by using a squirt bottle. Organic

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

should the bulb be cleaned mechanically.

Battery Replacement

Install a new battery when the low battery indicator appears on the LCD. Remove the

battery cover, install a new 9V battery, and replace the battery cover.

Troubleshooting the Meter

Meters are the least likely cause of pH measurement problems. To rule out the meter

check the following:

1. Check the 9V battery and replace it if necessary.

2. When using the AC adaptor for power, check that the line cord is firmly connected to

the meter.

3. Replace the existing electrode connector with optional BNC shorting plug (shorts the

ground ring to the center pin of the meter’s BNC jack) and check the following:

a) Set the measurement mode to pH. The LCD reading should be stable.

b) Adjust the calibration control for an LCD reading of 7.00.

c) Change to the mV measurement mode. The LCD should read 0 mV.

d) Note that an out of range reading is indicated by dashes ( -------).

Oyster-10, V1.811/07

Troubleshooting an Electrode Problem

Symptom Cause Recommended Solution

Clogged Junction Soak in 4.07 M Potassium Chloride

(KCl) @ 60oC for 30 minutes. Replace

electrode if necessary.

Strong Alkaline

measurement Soak in 0.1 M HCL overnight

Deteriorated Gel layer of

pH sensing membrane Replace electrode

Protein coating on

electrode surface Soak in 1 gm Pepsin dissolved in

100ml of 0.1 m HCL for 30 mins. or as

needed

Oil, paint, dyes, suspended

solids on sensor Rinse electrode alternately with

materials solvent (briefly) then a

buffer 7.00

Organic solvents are

coating sensor 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.

Long response time or

reading drift

Dehydrated membrane Read solution for dry bulb below

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.

Oyster-10, V1.811/07



Support line (781) 890-7440

Technical Support: Extension 200; E-mail: [email protected]

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Care Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

WARRANTY

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for three years from date of shipment (a six month limited

warranty applies to sensors and cables). If it should become necessary to return the

instrument for service during or beyond the warranty period, contact the Customer Service

Department at (781) 890-7440 ext. 210 for authorization or visit our website

www.extech.com for contact information. A Return Authorization (RA) number must be

issued before any product is returned to Extech. The sender is responsible for shipping

charges, freight, insurance and proper packaging to prevent damage in transit. This

warranty does not apply to defects resulting from action of the user such as misuse,

improper wiring, operation outside of specification, improper maintenance or repair, or

unauthorized modification. Extech specifically disclaims any implied warranties or

merchantability or fitness for a specific purpose and will not be liable for any direct, indirect,

incidental or consequential damages. Extech's total liability is limited to repair or

replacement of the product. The warranty set forth above is inclusive and no other

warranty, whether written or oral, is expressed or implied.

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