Genesis GI-98129 Instruction And Operation Manual

Brand: Genesis

Model: GI-98129

Category: Measuring, testing & control

Type: Instruction And Operation Manual

This manual is also suitable for

GI-98130

Genesis Instruments

Instruction and

Operation Manual

P.O. Box 1318 Gresham Or. 97030 USA

1-800-669-2113 Fax 1-503-663-1147

info@greenair.com www.greenair.com

Introduction

How to Operate

COMBO METER

pH-EC-TDS-TEMP

General Description

GI-98129 and GI-98130 are waterproof pH, EC/TDS and

temperature meters. The housing has been completely sealed

against humidity and designed to float. All pH and EC/TDS

readings are automatically temperature compensated (ATC),

and temperature values can be displayed in °C or °F units.

For EC/TDS readings, the EC/TDS conversion factor (CONV)

is selectable by the user, as well as the temperature

compensation coefficient ß (BETA). The meters can be

calibrated at one or two points for pH (with auto buffer

recognition and at one point for EC/TDS). Measurements are

highly accurate with a unique stability indicator right on the LCD.

A low battery symbol warns the user when the batteries are to

be replaced. In addition, the Battery Error Prevention System

(BEPS) avoids erroneous reading caused by low voltage level

by turning the meter off. The pH electrode supplied with the

meter is replaceable by the user. The stainless steel

encapsulated temperature sensor facilitates faster and more

accurate temperature measurement and compensation.

Pocket Pen

Models GI-98129

and GI-98130

Familiarizing yourself with your new meter

A. Turning your meter “on”: To turn your meter on, press and

hold the O/MODE button for 2-3 seconds. Notice that every

time you turn the pen on, it will flash all icons used on the LCD

for a few seconds. This is immediately followed by the

percentage of remaining battery life – example: % 95 BATT).

After the battery life flashes the pen will settle into “normal

measurement mode”. Now would be a good time to get familiar

with the measurement options. This is located to the right of

the ATC icon and above the “primary display”. Press the Set/

Hold button repeatedly and the measurement options will scroll

between PPM, uS, & pH (or ppt, mS, and pH for the GI-98130).

B. To turn your meter “off”: Make sure the pen is normal

measurement mode, then press and hold O/MODE button. The

LCD will read “OFF”. Immediately release the O/MODE button,

your meter will now be off.

C. Freezing the display: press the set/hold button for 2-3

seconds until the secondary display reads “HOLD”. Pressing

either button will return you to normal measurement mode.

NOTE: Before taking a measurement, follow the calibration

instructions to ensure accurate readings. For accuracy it is

recommended to carry out a two point calibration. For best

results always use Genesis Instrument buffers and calibration

solutions. If measurements are taken in different samples

successively, rinse the electrode thoroughly to eliminate cross-

contamination and after cleaning, rinse the electrode with some

of the sample to be measured. When not in use, rinse the

electrode with water and store in a few drops of storage solution.

Do not use distilled water. If electrode dries out soak in storage

solution for one hour. Clean monthly in cleaning solution.

Electrode Replacement

The pH electrode can be easily removed with the tool provided.

Insert the tool into the electrode cavity as shown below.

Remove the electrode by rotating it counterclockwise and then

pull out. Insert the new electrode by following the above

instruction in reverse.

Specifications: GI 98129 low range GI 98130 high range

Range EC 0 to 3999 µS/cm 0.00 to 20.00 mS/cm

TDS 0 to 2000 ppm 0.00 to 10.00 ppt

pH 0.00 to 14.00 pH 0.00 to 14.00 pH

Temp 0 to 60°C or 32 to 140°F 0 to 60°C or 32 to 140°F

Resolution EC 1 µS/cm 0.01 mS/cm

TDS 1 ppm 0.01 ppt

pH 0.01 0.01

Temp 0.1 °C or 0.1 °F 0.1 °C or 0.1 °F

Accuracy @ 20°C/68°F EC/TDS ±2% F.S. ±2% F.S.

pH ±0.05 ±0.05

Temp ±0.5 °C or ±1 °F ±0.5 °C or ±1 °F

Typical EMC Deviation EC/TDS ±2% F.S. ±2% F.S.

pH ±0.02 ±0.02

Temp ±1 °C or ±1 °F ±1 °C or ±1 °F

Calibration EC/TDS Automatic at 1 point

pH 1 or 2 points with (pH 4.01, 7.01 & 10.01 )

Temp Compensation EC/TDS/pH Automatic

EC / TDS Conv Factor Adjustable from 0.45 to 1.00

Environment 0 to 50°C (32 to 122°F); R.H. 100%

Battery Type / Life 4 x 1.5V / 100 hours

Auto Shut-off After 8 minutes

Dimensions 163 x 40 x 26 mm (6.4 x 1.6 x 1.0")

Weight 85 g (3 oz.)

Specifications

Genesis Instruments is a trademark of Green Air Products Inc.

Genesis Instruments are warranted for one (1) year against

defects in workmanship and materials when used for their

intended purpose and maintained according to instructions. The

electrode is warranted for a period of six months. This warranty

is limited to repair or replacement free of charge. Damages

due to accident, misuse, tampering or lack of prescribed

maintenance are not covered. If service is required, contact

the dealer from whom you purchased the instrument. If under

warranty, report the model number, date of purchase, serial

number and the nature of the failure. If the repair is not covered

by the warranty, you will be notified of the charges incurred.

When shipping any instrument, make sure it is properly

packaged for complete protection.

Warranty

www.greenair.com

For more information on this product and other Green

Air Products equipment and controls, see our web site at

www.greenair.com

Conductivity Calibration

A. There are many ways to calibrate these meters for

conductivity depending on the options selected, the following

are Green Air Products recommendations for calibration to read

nutrient solution strengths for hydroponics. Following these will

ensure accuracy in a user-friendly manner.

B. Since all TDS (ppm/ppt) readings are based on EC (uS,

mS) we recommend calibrating by using EC (uS, mS). We also

recommend setting the EC/TDS conversion factor (CONV) to

0.70. To change conversion factor: turn the meter on, select

either ppm or uS (ppt or mS for the GI-98130) measurement

option. Now press and hold the O/Mode button until the

secondary display reads TEMP. Press the O/Mode button once

more to show current conversion factor. Example: 0.50 CONV.

Use the Set/Hold button to change conversion factors to 0.70.

To continue you must press the O/Mode button again. This will

take you to a setting mode called BETA, make sure your BETA

value is and remains on 1.9. Note: BETA is a temperature

compensation coefficient used mainly in certain laboratory

situations and not needed for hydroponics. If you need to change

this setting, use the Set/Hold button while in BETA mode.

Pressing the O/Mode button one more time will return you to

normal measuring mode.

C. To calibrate conductivity: with the meter on, select the uS

(mS for the GI-98130) measurement option, then press and

hold the O/Mode button until the LCD reads CAL, immediately

let go of the button when you see “CAL”. The meter will prompt

you to use 1413uS (or 12.88mS) buffer solution. Immerse the

probe into the solution. Notice the CAL icon in the lower left

corner is flashing to denote that the meter is trying to calibrate.

Once the calibration has been automatically performed, the LCD

will flash OK for 1 sec. before returning to normal measurement

mode (keep close watch for the OK or you might miss it). You

are now free to measure conductivity in either uS or ppm (mS

or ppt on GI-09129). Note: the CAL icon in lower left corner of

LCD now remains solid, signifying calibration is completed.

Calibrating pH

A. Make sure that the meter is powered on and is in the pH

measurement option. Now press and hold the O/MODE button

until “CAL” appears on the secondary display. Immediately

release the button when you see the “CAL” icon. The LCD will

now read 7.01 in the primary display and USE under in the

secondary display. Notice the CAL icon will be flashing in the

lower left corner of the LCD. Fully submerge the electrode

(located at the bottom of the pen) in Genesis pH 7.01 buffer

solution. The meter will automatically recognize the buffer and

calibrate to it. After recognition of the 7.01 the meter will prompt

you to use 4.01. At this time you may opt out and use a single

point calibration of 7.01 or continue to perform a two-point

calibration. To opt out and use a single point calibration of 7.01,

simply press the O/Mode button.

B. To proceed with a two point calibration. Rinse the

electrode with pure water to avoid cross-contamination. Then

submerge electrode into pH 4.01 buffer solution. After

recognition of the 4.01, OK will flash for 1 second on the LCD,

(watch the LCD closely or you may miss the OK) then the meter

will return to normal measurement mode. At this time, you may

notice that the CAL icon (bottom left of LCD) that was flashing

now remains. This denotes that the calibration process has

been completed. NOTE: for hydroponics and growing

applications, we recommend pH 7.01. For people who have

need for NIST 6.86 buffer follow instructions as follows:

With meter on and in pH measurement option press and hold

the O/Mode button again to show current buffer set which will

be pH 7.01, to switch to pH 6.86 use the Set/Hold button to

toggle between the two. Press the O/Mode button to return to

normal measurement mode.

Taking Measurements & Changing Temperature Units

A. To take a Measurement: While the meter is on, select

desired measurement option (pH, uS, ppm for GI-98129 or pH,

mS, ppt for GI-98130). Submerge the electrode directly into

the solution or sample to be tested while stirring gently. For

sample testing use plastic, paper, or styrofoam to hold the

solution to avoid electromagnetic interference. Measurement

is complete when the stability indicator disappears. The

measurements are automatically temperature compensated by

ATC software within the meter.

B. To Select °C or °F to Read Temperature: With meter on

and in any measurement option, press and hold O/Mode button

until LCD reads TEMP then release button. Now use the Set/

Hold button to toggle between °C and °F To return to normal

measurement mode, press the O/Mode button twice.

Battery Replacement: The meter displays the remaining

battery percentage every time it is switched on. When the

battery level is below 5%, the battery symbol on the bottom left

of the LCD lights up to indicate a low battery condition. The

batteries must be immediately replaced. If however the battery

level is so low as to cause erroneous reading, the Battery Error

Prevention System (BEPS) will automatically turn the meter

off.

1. Battery Compartment

2. LCD Display

3. ON/Off/MODE Button

4. pH Electrode

5. Temperature Sensor

6. Conductivity Probe

7. SET/HOLD Button

1. Indicates Automatic Temperature Compensation (ATC)

2. Stability Indicator (meter is calculating reading)

3. Percentage of battery life display icon

4. Calibration is complete icon (flashes during calibration)

5. Low Battery Indicator (shows replacement is necessary)

6. Measurement Mode Indicator

7. Primary Reading Display

8. Temperature Scale Icon

9. Secondary Display

To change the batteries, remove the 4 screws located on the

top of the meter. Once the top has been removed, carefully

replace the 4 batteries located in the compartment while paying

attention to their polarity. Replace the top, making sure that

the gasket is properly seated in place, and tighten the screws.

DO NOT OVERTIGHTEN THE BATTERY COVER!!!

Feature Descriptions

Always look for the

molecule to be assured of quality

and a genuine Green Air Product

Genesis GI-98129 Instruction And Operation Manual

Brand: Genesis

Model: GI-98129

Category: Measuring, testing & control

Type: Instruction And Operation Manual

This manual is also suitable for

GI-98130

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Genesis GI-98129 Instruction And Operation Manual

This manual is also suitable for

Genesis GI-98129 Instruction And Operation Manual

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