Maruplast 2103 Manual de instalación

Cardy Twin pH

METER

Operation Manual

Catalog #2103

TECNOLOGÍAS EN INVERNADERO

General Overview.............................................3

Specifications...................................................4

Meter Components...........................................5

Calibration and Measurement.........................6

Measuring Soil and Liquid Samples...............7

Replacing the Sensor ......................................8

Battery Replacement .......................................9

Handling Preautions .....................................10

Warranty..........................................................12

Product Return...............................................13

Notes ...............................................................14

Contents

This manual will familiarize you with the features and

operation of your new Twin pH meter. Please read this

manual thoroughly before using your instrument. For

customer support, or to place an order, call Spectrum

Technologies, Inc. at (800)248-8873 or (815) 436-4440

between 7:30 am and 5:30 p.m. CST

Spectrum Technologies, Inc

12360 S. Industrial Dr. East

Plainfield, IL 60585

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General Overview

Congratulations on the purchase of your Cardy Twin pH Meter.

This manual describes your Cardy pH Meter, tells you how to use

it, and keep it working accurately.

The Cardy Twin pH Meter delivers high quality answers with an

accuracy of ±0.1 pH. This self-contained digital meter allows you

to test the pH levels in water, soil, sap and much more.

The replaceable sensor makes measurement of small samples

much more convenient. See page 8 for details.

There is a two-point automatic calibration (4.0, and 7.0 pH), with

a range of pH 2.0-12.0. The display will read out your results to

the hundredth place.

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Meter Components

1. Reference Junction (A)

2. Glass Electrode Sensor (B) - Measurement is made when liquid

covers both the reference junction and the sensor.

3. LCD - Gives measurement and calibration information. Also indi-

cates when battery needs replacement.

4. On/Off Button - Turns meter on and off.

5. CAL Button - Holding this button down toggles through the pH7

and pH4 calibrations. Also used to enter temperature measurement

mode.

6. Sensor Guard - Protects the sensor during and after measure-

ment.

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Calibration & Measurement

1) Turn power supply on.

2) Rinse the sensor with distilled water. Gently blot dry.

3) Apply a few drops of pH 7 Standard Solution to the Sensor. Confirm

that the sensor and the reference junction are connected with the

Standard Solution.

4) Press and hold the CAL button once. The “CAL” symbol will illumi-

nate on the LCD and pH 7.00 will appear on the display.

5) Calibration is complete when the “CAL” symbol disappears and the

readout reads pH 7.0 . Rinse the Sensor with distilled water and blot

dry.

6) Apply a few drops of pH 4 standard solution to the sensor. Confirm

that the sensor and the reference junction are connected with the

Standard Solution.

7) Press and hold the CAL button until the “CAL” symbol and pH 4.01

appear on the display.

8) Calibration is complete when the “CAL” symbol disappears and the

readout reads pH 4.0. Rinse the Sensor with distilled water and blot dry.

9) Apply the sample to the Sensor by placing a small amount of the

sample on the Sensor with the pipet, immersing the Sensor in the

sample, or by scooping out a representative measurement sample.

Confirm that the glass sensor and the Liquid Junction are entirely

covered by the sample.

10) Read the data when figure on the LCD is stabilized and the

?symbol appears.

11) Rinse the sensor thoroughly with distilled water after each meas-

urement. Replace the sensor cap on the sensor when finished.

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Measuring Soil and

Liquid Samples

Soil Samples

1) Collect a representative soil sample.

2) Mix the soil and distilled water using a 1:1 proportion.

Stir for 30 seconds.

3) Allow 1 to 2 minutes before you begin the test.

4) Submerge the sensor into the mixture of soil and

distilled water. Read the results.

5) Wash the sensor with distilled water and blot dry.

Liquid Samples

There are three ways to apply the sample to the sensor.

1. Open the sliding cap of the sensor guard and

submerge the sensor into the sample solution.

2. Open the sensor guard and apply the solution to the

sensor

3. Swirl the sensor in the liquid, scoop out a sample, and

set meter on a level surface for taking measurement.

Note: This pH meter is water resistant. However, do

not make any measurements by completely submerging

the meter in the sample solution. If, by mistake, the

meter is dropped into the sample solution, recover it

immediately and dry it quickly and thoroughly.

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Replacing the

Sensor

1) Wipe water off the meter.

2) Pull the bottom part of the housing away from meter by pushing the

tongue located on the backside of the meter and sliding the sensor

away from the unit body.

3) Confirm that the watertight O-Ring is properly seated.

4) Insert the new sensor into the meter firmly.

5) Calibration the meter.

NOTE:

• Do not remove the replacement sensor when the pH meter is wet.

This can damage the meter’s electronics.

• The sensor connection must be watertight. Therefore, the gasket

should be replaced every two years.

The sensor should be replaced when:

• Sensor response is slow, measured value is unstable, or calibration

cannot be made.

• Measured value does not change when the sample is changed.

• Display of 0.0 blinks during measurement.

• Temperature warning blinks.

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Battery

Replacement

The batteries need to be replaced when the LCD displays “B” while the

power is turned on or if it is blank after the Power button is pressed.

Replacing the battery

1. Wipe water off the meter.

2. Pull out upper housing.

3. Remove the dry cell holder.

4. Put two new batteries in with the “+” surface facing upward.

5. Confirm that the watertight O-Ring is properly placed in the housing

of the meter. Re-assemble the.

CAUTIONS

• Don’t remove housing of the meter when it is wet. This can dam-

age the meter’s electronics.

• The sensor connection must be watertight.

• Re-calibrate the meter after the batteries are replaced. The cali-

bration value is deleted when the batteries are removed.

• If the meter does not work properly, check the voltage of the

batteries and repeat the battery replacement procedure.

Make sure that

batteries are

properly seated and

in good contact with

the battery clips as

shown.

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• Calibrate the meter prior to the first use. Daily calibration is

recommended.

• Meter will not function correctly when calibration is performed

under the following conditions

-No standard solution on the sensor

-Bubbles on the surface of the sensor

-Either the sensor and or reference junction is not covered

with the sample.

-Sensor not properly installed in the pH Meter

-Sensor has reached the end of its service life

• Measurement cannot be made while the LCD is displaying the

“CAL” symbol.

• Don’t calibrate with a standard solution other than pH 7.0 or pH

4.0. This will lead to inaccurate measurements.

• When making measurements of tap water, rainwater, or other

solution with extremely low ion concentration, note the following:

-Rinse the sensor thoroughly before taking measurement.

-Apply a few drops of the sample of solution to be measured.

The pH value might be unstable when the sensor is simply

immersed into the solution to be measured.

• In measurement of soil or other solid matter, make a slurry using

distilled water.

• Don’t scratch or apply excessive force to either the sensor or refer-

ence electrode.

Handling

Precautions

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• Don’t immerse the On/Off or CAL buttons in water.

• Don’t replace the batteries or the Reference Electrode when the pH

meter is wet.

• Don’t press the POWER or the CAL Switches with a pointed object.

• Don’t use the pH Meter at temperatures out of the working range of

5ºC-40ºC (41ºF-104ºF). This will shorten the service life of the sen-

sor will be shortened.

• The following substances will damage the sensor :

Organic Solvent (thinner, benzene, etc.)

Strong acid (pH 0-2)

Strong alkali (pH 12-14)

Surface active agents, alcohol, oil, adhesive and cement.

• Keep the sensor away from direct sunlight or other strong light

during calibration and measurement.

• If the meter has not been used in several days, hydrate the sensor

by immersing it in water for about five minutes before calibrating.

• White crystals on the sensor are not a symptom of trouble. Simply

rinse the sensor before use.

• Although the meter is auto-temperature compensated, it is recom-

mended that, as much as possible, the sample and meter be ap-

proximately the same temperature.

• Avoid extremes of temperature. Don’t place the pH meter close to

heaters or where the meter might be exposed to direct sunlight.

• Don’t bend or drop the pH Meter.

• Standard solution is caustic acid. Wash the skin thoroughly with

water if the standard solution comes in contact with skin.

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