Bluelab Multimedia pHMeter Leitfaden

Care and Use

Guide.

Probe cable length:

2 metres / 6.6 feet

Contents page

Features 2

Bluelab®Multimedia pH Meter 2

Introduction 3

Preparing for use 3

Calibration 4

Information about measuring

the pH of soils/media 6

Measuring the pH value 8

Measuring soil solution

pH value 8

Battery replacement 9

Cleaning the Bluelab®

Leap™ pH Probe 9

Hydrating the Leap™ pH Probe10

Storing the Bluelab®

Multimedia pH Meter 10

Error messages 11

Technical specications 11

Troubleshooting guide 12

Bluelab®Leap™ pH Probe

replacement 13

Bluelab®Leap™ pH Probe Care13

Bluelab®limited warranty 14

Contact details 15

English

Bluelab®Multimedia pH Meter

Low battery

indicator Successful pH

calibration indicators

pH unit

Keep your pH probe tip wet

at all times to avoid permanent damage

Leap™

pH Probe

connection

socket (BNC

Display

Power button

Bluelab

Leap™

Calibrate

button

Bluelab

Leap™ pH Probe storage cap

The probe tip must not be allowed to dry out. Always

place the storage cap back onto the Leap™ pH Probe

after each use. Ensure the cap contains enough

Bluelab

pH Probe KCl Storage Solution to cover the

probe tip.

Features

Test more with a faster sensor response

and direct measurements from substrates

Multimedia friendly, for measurements

across a range of environments

Toughened glass for a more robust probe Toughened spear tip for direct root-zone

measurements

Simple two point calibration process with

30 day calibration indicator

Backlit LCD display, low battery indicator,

auto off function

English

1.0 Introduction

The Bluelab®Multimedia pH Meter has two press buttons; ‘calibrate’ and power. The power

button requires a short press; release in about one second. The ‘calibrate’ button requires a

long press; hold for at least three seconds and release when the display starts ashing.

Turning the Bluelab®Multimedia pH Meter on and off

A short press of the power button will turn the Bluelab®Multimedia pH Meter on.

The Bluelab® Multimedia pH Meter automatically turns off after approximately four

minutes if no buttons are pressed.

If the Bluelab®Multimedia pH Meter turns off before the reading is taken, short

press the power button to turn the meter on again.

2.0 Preparing for use

The following tasks must be performed before the Bluelab®Multimedia pH Meter and

Bluelab® Leap™ Probe are used for the rst time.

IMPORTANT: The Bluelab® Leap™ pH Probe must be preconditioned to your intended

grow media before calibration. The bridge between the glass tip of the probe and the

body of the probe may change colour/look dirty (this is especially obvious with soils

with higher clay contents). This is normal.

Insert batteries.

See section 7.0.

Connect Leap™ pH Probe

Connect the Leap™ pH Probe to the Bluelab®

Multimedia pH Meter via the BNC ttings.

Remove the storage cap

Remove the pH probe storage cap by gripping

the top of the cap and gently twisting the base

one rotation clockwise to loosen slightly. Next

slowly slide the cap off the pH probe. DO NOT

completely remove the base of the cap from the

top of the cap.

CAUTION: When the Leap™ pH Probe is not in

use, add enough Bluelab®pH Probe KCl Storage

Solution to the storage cap so the probe tip is

covered. Then replace the cap and store in a

secure place.

DO NOT use RO (Reverse Osmosis), Distilled

or Deionized water. Pure water changes

the chemistry in the reference, causing the

probe to die.

Insert the probe 3-5 times into the media you

are going to be measuring to pre condition,

clean following section 8 cleaning instructions.

Calibrate the pH

Calibrate the Bluelab®Multimedia pH Meter by

following the instructions in section 3.0 of this

manual.

This must be done before the Bluelab®

Multimedia pH Meter is used for the rst time.

Attaching the Bluelab

Leap™

pH Probe to the Meter

Removing Leap™

pH Probe storage

Ensure probe tip is

covered by the KCl

storage solution in cap

See section 3.0

for calibration

steps

Push connector Twist & attach

Leap™ pH Probe bridge

before and stained after

preconditioning in soil.

This is normal.

Before After

English

3.0 Calibration

pH calibration is required before rst use and then at least monthly to ensure

readings are accurate. Bluelab® recommend more frequent calibration with high use.

The Bluelab® Leap™ pH Probe should be cleaned and recalibrated when:

• The reading is different to what you were expecting.

• The batteries have been removed or changed.

• The Bluelab® Leap™ pH Probe is replaced with a new one or is disconnected from the

Bluelab®Multimedia pH Meter.

• The pH calibration indicators have disappeared.

When calibrating the pH after rst use the Bluelab® Leap™ pH Probe needs to be

cleaned. See Leap™ pH Probe cleaning in section 8.0. The Bluelab® Leap™ pH Probe

does not need to be cleaned for initial calibration unless you have pre-conditioned the

probe in media.

For best pH calibration

pH reading accuracy is dependant on the accuracy and age of the calibration

solutions used, and use and cleanliness of the Bluelab® Leap™ pH Probe tip.

• Ensure the Bluelab® Leap™ pH Probe has been cleaned and rinse the Leap™ pH

Probe tip with clean water between calibration solutions to reduce contamination of

the pH solutions.

• Only fresh uncontaminated solutions should be used.

• Calibrate the pH at the same temperature as the solution to be measured.

• ALWAYS calibrate the Bluelab® Leap™ pH Probe with pH 7.0 then pH 4.0 or pH 10.0.

• If you are changing media (including using new media) you should pre-condition the

probe by inserting it in the media 3-5 times and cleaning before calibrating

The pH calibration involves cleaning the Bluelab® Leap™ pH Probe tip and then

calibrating in TWO SOLUTIONS.

If a reading below pH 7.0 is expected, use pH 7.0 and pH 4.0 calibration solutions.

If a reading above pH 7.0 is expected, use pH 7.0 and pH 10.0 calibration solutions.

Follow the steps below for Multimedia pH Meter calibration.

Storage and use of calibration solutions

• Always place the lid back onto the bottle after use or evaporation will occur rendering

the solution useless.

• DO NOT measure directly into the bottle. Tip a small amount into a clean container

and discard after use.

• Store in a cool place.

• Never add water to solutions.

When to calibrate

Light user

(Up to 50 insertions

a week)

Heavy user

(More than 50

insertions a week)

Solution Calibrate at least

once a month

Low Abrasive Media

(eg Rockwool, CocoCoir) Calibrate at least

once a week

Highly Abrasive Media

(eg Soil, potting mix)

English

3.0 Calibration cont.

To calibrate the pH

Clean pH probe tip.

See section 8.0 (the Bluelab® Leap™ pH Probe

does not require cleaning before the rst use,

unless it has been preconditioned).

pH 7.0 calibration

a) Press any button to turn the Bluelab®

Multimedia pH Meter ON.

b) Loosen and remove cap from probe.

c) Rinse probe tip in fresh water, then place in pH

7 solution.

d) Press the CAL button until CAL appears on the

screen and release.

e) A series of ashing ‘



’s will appear. Once

calibration is complete, PH7 will be displayed.

f) If Err appears during the calibration process

see Section 11.0.

g) The Multimedia pH Meter must be calibrated

to two points. If after an hour the meter has not

been calibrated with a second calibration point

the calibration indicators disappear and the

Multimedia pH Meter reverts to an uncalibrated

state. Calibration is required.

pH 4.0 / 10.0 calibration

a) Rinse pH probe tip in fresh water, then place in

either pH 4 or pH 10 solution.

d) Press the CAL button until CAL appears on the

screen and release.

e) A series of ashing ‘



’s will appear. Once

calibration is complete, pH 4 or pH 10 will be

displayed.

f) Rinse pH probe tip in fresh water.

c) The Multimedia pH Meter is now calibrated

and ready for use.

d) The successful calibration indicator ‘ ’ or

‘ ’ will appear on screen.

d) Probes require cleaning and calibrating at least

every 30 days, more frequent with high use.

Store the Leap™ pH Probe

Add enough Bluelab pH Probe KCl Storage Solution

into the probe storage cap to fully submerge the

Leap™ pH Probe tip. Place storage cap on probe.

Successful pH 7

and pH 4 calibration

pH 4.0 or

pH 10.0

calibration

solution

pH 7.0

calibration

solution

Rinse the Leap™ pH

Rinse in tap water

Ensure probe tip is covered by

the KCl storage solution in cap

English

4.0 Information about measuring the pH of soil/media

pH is the measurement of the hydrogen ion concentration (H+) - acidity and

its opposite, alkalinity. Neutral pH is 7.0 pH. Acidity measures below seven

pH (7.0 pH) with alkalinity measuring above it (7.0 pH). See chart below.

In soil or growing media, pH strongly inuences the availability of nutrients to the plant

and the presence of microorganisms in the soil.

Certain plants require a particular pH range to enable the required nutrients to be consistently

available to the plant. If the solution is too acidic or too alkaline it can cause “lock up” – a

situation which restricts certain elements essential for growth from being absorbed by the

root structure. This in turn reduces plant health and performance. Deciencies in the required

elements become apparent in plant growth and can lead to crop failure.

Low soil pH causes aluminium and manganese toxicity in plants and reduces the availability

of soil phosphorus. High soil pH also reduces soil phosphorus availability and reduces micro

nutrients such as zinc and boron to plants.

The chart below shows how nutrient pH levels inuence the uptake of certain elements.

Recommended pH range for plants grown in:

English

4.0 Information about measuring the pH of soil/media cont.

Taking pH measurements of soil with an electronic meter is indicative

rather than absolute.

The following factors are outside the control of any Multimedia pH Meter, so

to minimise their effect on the accuracy of the pH measurement you should

consider the following precautions:

Moisture level/raw water

If the sample you are wishing to measure is dry, add RO water or distilled water to moisten.

Ideally wait 24 hours before you take a measurement.

NOTE: If you add tap water, you will inuence the soil pH reading based on the pH of the tap

water.

Calibration of the Multimedia pH Meter and cleanliness and age of the probe

Calibrating the Multimedia pH Meter at least monthly will help ensure accurate readings.

Cleaning the soil residue from the probe tip and storing in a clean moist state will help provide

reliable readings as well as prolonging the probes life.

Sample selection

For open eld testing, remove the top 5 - 10 cm / 2 - 4” of the top of the soil. Samples are

taken approximately 15 - 20 cm / 6 - 8” down into the soil and from various areas in the eld,

then an average of the readings is used.

For container grown plants, it is recommended to check the pH level of the grow media prior to

planting.

Factors affecting pH in the soil or media:

Soil type

Soils formed under high rainfall conditions (e.g. Eastern USA) are more acidic than those

formed under dry conditions (e.g. Western USA).

Growth stage of the plant

Uptake and requirements of particular elements change as the plant progresses through it’s

growing cycle. Recording pH level data to create a history is valuable.

Applications and types of fertilizers

Applications and types of fertilizers can alter the pH level signicantly. The time at which you

take the reading is important. Evaluate the brand of fertilizer to see if it is altering the pH in

the wrong direction.

Applications of sprays

As sprays can soak into the soil/media, it can change the pH levels.

Soil/media temperature

High temperature soils may have a high concentration of CO2. The higher the concentration of

carbon dioxide, the more carbonic acid there is which lowers pH.

pH range for soil crops

The recommended pH range for soil crops is 6.2 - 7.2, but this is plant specic.

English

5.0 Measuring the pH value

Once the Bluelab®Multimedia pH Meter has been set up and calibrated, using it to measure

a pH value involves using the Bluelab®Leap™ pH Probe, the dibber/auger for coarse soil and

button functions. NOTE: The pH probe tip must not have dried out. If it has dried, soak the

Bluelab® Leap™ pH Probe in KCl for at least one hour prior to taking a measurement.

If measuring outside of solution, rockwool or small/shallow pots, remove the top

5cm / 2in. from the surface of the sample area.

If the soil/media is dry, moisten with a small amount of distilled water.

Turn the Multimedia pH Meter on.

Remove the storage cap and insert the Leap™ pH Probe in grow media, if using dibber

ensure probe in in contact with soil

Wait for the reading displayed on the Multimedia pH Meter to stablize to a constant value.

This can take up to four minutes. Record the reading.

Remove the Leap™ pH Probe from the soil/media and wash the Leap™ pH Probe tip

under fresh running water (not distilled) to remove any remaining soil residue.

Repeat the procedure in different locations and take the average of the measured data as

the pH level is representative of the sample area.

If the Multimedia pH Meter turns off while taking a measurement, simply press the power

button to turn the Multimedia pH Meter back on and continue with your measurement.

Store the Leap™ pH Probe between measurements. See section 10.0.

6.0 Measuring soil solution pH value

The greatest source of error in soil analysis comes during sample collection. An effort should be

made to ensure each sample properly represents the area being sampled.

• The readings taken with this method could be higher than those taken by other methods

• Consistency of the method used is important to be able to compare sets of results

• The accuracy of this method cannot be guaranteed because of the variables involved

• The results should be viewed as ‘indicative’ rather than ‘absolute’

Collection of sample

Sample in a zig-zag pattern across the required area.

Remove 15 mm / 5/8 in. of top soil before sampling at a depth of 150 mm / 6 in.

Mix all collected samples together thoroughly.

Allow to dry in the air or in an oven at 40 °C / 104 °F.

Weigh out 20 g / 0.7 oz of the collected soil into a 150 ml / 5  oz plastic sample jar.

Sample preparation

Add 100 ml / 3  oz of distilled or deionized water, screw lid on tightly.

Shake continuously for 5 minutes. Leave overnight and shake again the next morning.

Allow to settle for 15 minutes after shaking and strain sample into clean measuring cup.

Take pH readings as follows:

Remove the storage cap and insert the Leap™ pH Probe tip into the soil solution sample.

Turn the Multimedia pH Meter on.

Wait for the reading displayed on the Multimedia pH Meter to stablize to a constant value.

This can take up to four minutes. Record the reading.

Remove the Leap™ pH Probe from the soil solution and wash the Leap™ pH Probe tip

under fresh running water (not distilled) to remove any possible soil residue.

If the Multimedia pH Meter turns off while taking a measurement, simply press the power

button to turn the Multimedia pH Meter back on and continue with your measurement.

Store Leap™ pH Probe between measurements

See section 10.0.

English

7.0 Battery replacement

Batteries are replaced in the Bluelab®Multimedia pH Meter when the low battery

indicator appears on screen. The low battery indicator remains on and the Bluelab®

Multimedia pH Meter continues to operate until the batteries die or are replaced.

Open battery compartment by sliding the back cover down and

insert 2 x AAA batteries as shown on the battery holder. Slide

cover back on. NOTE: Alkaline batteries are recommended.

IMPORTANT: Check the batteries at least once every six

months for signs of deterioration, rusting or swelling.

If signs of deterioration are found, clean battery holder

contacts and replace batteries.

Battery

cover

8.0 Cleaning the Bluelab®Leap™ pH Probe

To ensure accurate readings the Bluelab® Leap™ pH Probe needs to be rinsed in water

after each use and cleaned prior to calibration using the following instructions.

The storage cap must always be put back on after cleaning. Always ensure it contains

enough Bluelab®pH Probe KCl Storage Solution to cover the probe tip.

Remove storage cap from Leap™ pH Probe.

Hold the top of the storage cap, twist the cap to

loosen then remove.

Rinse Leap™ pH Probe tip under fresh tap

water. Never use RO (Reverse Osmosis), Distilled

or Deionized water. Note the bridge on the tip gets

discoloured by grow media.

Fill a small plastic container with clean tap water.

Add a small amount of Bluelab®pH Probe Cleaner

or mild detergent (dishwashing liquid).

Gently stir the probe tip in the mixture.

Ensure that you do not ‘knock’ the Leap™ pH

Probe on the side of the container as this may

cause damage to the probe.

Rinse well under fresh running water to remove all

traces of the detergent mixture.

If the probe tip requires removal of heavy

contamination: Gently brush around the

glassware, do not touch the glassware, with

a few drops of Bluelab pH Probe Cleaner or

mild detergent (dishwashing liquid) and a soft

toothbrush.

Note: Rubbing the glassware with the toothbrush

can change the charge on the glass tip.

Do not brush the glassware

Rinse well under fresh running tap water to

remove all traces of the detergent mixture.

Calibrate Leap™ pH Probe after cleaning,

see section 3.0 After calibration, store Leap™

pH Probe in the storage cap, ensuring there is

enough KCl Storage Solution to cover the tip.

3 4

English

10.0 Storing the Bluelab®Multimedia pH Meter

Store the Bluelab® Multimedia pH Meter in a cool, dry and clean place when not

in use.

Keep out of direct sunlight.

Keep Bluelab® Multimedia pH Meter out of direct sunlight to prevent irreparable

damage to the LCD reading display.

The Bluelab® Multimedia pH Meter is not waterproof but will withstand

occasional water splashes.

If the meter is splashed, wipe dry as soon as possible.

Remove batteries if the meter is to be stored for a prolonged period.

Remove pH probe if storing the pH Meter without use for longer than two to three

weeks and check regularly that the pH probe tip has not dried out.

When storing the Bluelab® Leap™ pH Probe, the probe tip must be kept

submerged in KCl solution in the storage cap.

DO NOT use RO (Reverse Osmosis), Distilled or Deionized water. Pure water changes

the chemistry in the reference, causing the probe to die.

9.0 Hydrating the Leap™ pH Probe

Hydrate the Leap™ pH Probe in Bluelab®pH Probe KCl Storage Solution when:

• the probe tip has not always been stored in KCl storage solution, to improve

the reading response speed.

• the probe tip has been accidentally allowed to dry out

Never use RO (Reverse Osmosis), Deionized or Distilled water.

Pure water changes the chemistry in the reference, causing the probe to die.

Loosen, then remove the storage cap.

Place the Bluelab®Leap™ pH probe upright

in a plastic container.

Clean the Bluelab® Leap™ pH Probe.

Ensure the probe tip is cleaned before

hydrating. See section 8.0 for instructions.

Add enough Bluelab®pH Probe KCl

Storage Solution to a plastic container to

submerge the probe tip.

If the KCL is dirty due to soil akes, use

fresh KCL solution.

Leave to soak for at least 24 hours.

After hydration, always calibrate the pH

probe to ensure accuracy, see section 3.0.

Bluelab pH Probe KCl

Storage Solution

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