Geotech GTW Manuel utilisateur

Rev 3/12/2018 Part # 22100045

Portable Turbidity

Meter

Installation and Operation Manual

Table of Contents

DOCUMENTATION CONVENTIONS ................................................................... 2

Section 1: System Description........................................................................... 4

Function and Theory ......................................................................................... 4

Instrument Features .......................................................................................... 4

System Components......................................................................................... 4

Section 2: System Installation & Navigation ................................................... 4

Install the battery............................................................................................... 5

Sample Vial Handling........................................................................................ 5

User Interface.................................................................................................... 6

Section 3: System Operation.............................................................................. 7

3.1 Quick Start Guide........................................................................................ 7

3.2 Menu Navigation ......................................................................................... 8

3.3 USB Connection........................................................................................18

3.4 Menu Structure.......................................................................................... 19

Section 4: System Maintenance....................................................................... 20

Section 5: System Troubleshooting ................................................................ 21

Section 6: System Specifications .................................................................... 22

Section 7: Parts and Accessories.................................................................... 23

The Warranty...................................................................................................... 29

NOTE

DOCUMENTATION CONVENTIONS

This uses the following conventions to present information:

General Information

In no event will the manufacturer be liable for direct, indirect, special, incidental or

consequential damages resulting from any defect or omission in this manual. The

manufacturer reserves the right to make changes in this manual and the products it

describes at any time, without notice or obligation. Revised editions are found on the

manufacturer’s website.

An exclamation point icon indicates a WARNING of a situation

or condition that could lead to personal injury or death. You

should not proceed until you read and thoroughly understand the

WARNING message.

WARNING

CAUTION

A raised hand icon indicates CAUTION information that relates to

a situation or condition that could lead to equipment malfunction

or damage. You should not proceed until you read and thoroughly

understand the CAUTION message.

A note icon indicates NOTE information. Notes provide additional

or supplementary information about an activity or concept.

In order to ensure your Turbidity Meter has a long service life and operates

properly, adhere to the following cautions and read this manual before use.

Disconnect from power source when not in use.

Power input source must not exceed maximum ratings.

Equipment must be wired to a negative ground system.

Equipment may not operate properly with excess wiring not supplied by

manufacturer.

Avoid spraying fluid directly at equipment.

Never submerge equipment.

Avoid pulling on wires to unplug equipment wiring.

Avoid using equipment with obvious physical damage.

To prevent equipment damage, avoid dropping it.

WARNING

The following applies only to users in European countries:

This product is designated for separate collection at an appropriate collection

point. Do not dispose of as household waste.

For more information, contact the seller or the local authorities in charge of waste

management.

Do not operate this equipment if it has visible signs of significant

physical damage other than normal wear and tear.

Notice for consumers in Europe:

This symbol indicates that this product is to be collected

separately.

Section 1: System Description

Function and Theory

Geotech's Portable Turbidity Meter offers great precision, repeatability and ease of use in

a low cost extremely robust portable/laboratory instrument. Data points from field sample

events can be stored to memory and transferred to computer or other storage device.

Turbidity Meters provide fluid clarity insight by shining light onto a sample and measuring

the amount of light scattered by suspended particles in the fluid.

The Geotech Portable Turbidity Meter has two light source models to fulfill specific

customer and site requirements:

Model GTW: White Light source, compliant to US EPA method 180.1

Model GTI: Infrared light source, compliant to ISO 7027 standards

Instrument Features

Sample chamber with lid

Data port/ power supply (serial

output, USB to Mini-B cable not

included)

Sealed battery compartment (4x AA

batteries)

IP67 Seal for extension into

hazardous environments

Digital display and navigation keypad

System Components

Economy carry case included,

optional custom foam cut case

available

Lint-free cleaning cloth

2 sample vials

Primary Calibration Standards: 0.10,

20, 100, 800 NTU

Figure 1-1: Instrument Features

Section 2: System Installation & Navigation

Install the battery

1. With a small Phillips screwdriver, remove the battery cover (located on the backside

of the instrument).

Take care to keep the small screws and washers safe when removing the

battery cover.

2. Install four (4) AA alkaline or nickel metal hydride (NiMH) batteries.

Make sure that batteries are installed in the correct orientation.

3. Replace the battery cover.

For optimal seal, we recommend using a torque screwdriver set to 4N-m.

Sample Vial Handling

When placing the vials into the instrument, ensure that

the white line on the sample vial is aligned with the black

arrow on the bottom edge of the instrument’s sample

chamber.

The sample vials must be very clean while calibrating or

doing field readings; no debris or fingerprints should be

visible on the glass. Use a soft cleaning cloth to ensure

clarity before each measurement. Do no store samples

and vial in extreme temperatures or direct sunlight.

Figure 2-1: Replacing the batteries

Handle calibration and sample vials by caps only. Any scratches on the

vials will compromise accurate turbidity readings.

User Interface

1. DISPLAY

Displays readings, diagnostics, and operational data.

2. UP ARROW (▲)

Scroll through menus, enter numbers and letters

3. DOWN ARROW (▼)

Scroll through menus, enter numbers and letters

4. MENU

Enters into main menu function, selects options to configure the instrument, select

analysis, and moves cursor to the right.

5. SAVE

Store Selections and data, saves the result to be USB transferred and selects the

parameters.

6. ESC/OFF

Powers off the instrument (hold for 3 seconds), aborts operations, return to the

previous screen.

7. READ/ON

Powers on the instrument (hold for 3 seconds), confirms options, initiates sample

reading, moves cursor to the left.

Figure 2-3: Instrument Keypad

Figure 2-2: Sample chamber

alignment

Section 3: System Operation

3.1 Quick Start Guide

To turn ON unit: press and hold the READ button for 3 seconds.

To turn OFF unit: press and hold the ESC button for 3 seconds.

Basic Operation

1. Turn instrument on by pressing READ for 3 seconds.

a. Once through the welcome screens, the unit will automatically

begin reading a sample.

b. See Section 3.2.2: Calibrate if Calibration is required.

2. Rinse the inside of each sample vial three times with the sample to be

tested.

3. Completely fill sample vial with sample, then dry and clean the outside of

vial.

Handle vial by the cap.

4. Align white mark on vial with arrow on bottom of sample chamber.

See “Sample Vial Handling” in Section 2: System Installation &

Navigation for details.

5. Close the sample chamber cap.

6. Press READ button again to take sample, NTU reading will appear after

status bar is complete.

7. Press SAVE button to mark reading, “M” will flash for 3 seconds in upper

left corner of display.

Figure 3-1: Basic Operation

Figure 3-1: Read (ON/Enter) ESC (OFF/Back)

3.2 Menu Navigation

The Geotech Portable Turbidity Meter has several configuration capabilities. The menu

structure is easy and simple to operate, please follow the steps below to configure the unit

according to your needs.

To Enter Main Menu: With instrument turned on, press MENU key for 3 seconds to enter

the Menu Function. You will see the following screen:

Using ▲ or ▼ the user can navigate between the main menu functions. When you reach

the desired menu or function press READ to enter, or ESC to go back to the previous

screen.

The four main sub menus are listed below:

ID - Access the user identification function

Calibrate - Access the calibration functions

Config - Access the configuration functions

Service - Access the service functions (only for certified technicians)

The fifth menu item is “Back” – when selected will navigate to the ready-to-sample screen.

Please reference the following pages for an explanation of instrument configuration and

menu navigation. See section 3.4: Menu Structure for an overview of the complete menu

structure.

3.2.1 ID (Identification)

From the main menu, use the ▲ or ▼ keys select the ID function, then press READ to

enter that submenu.

Sample

Use the ▲ or ▼ keys to set sample number from 0-99. Use the READ or

SAVE button to set the sample number and exit to the ID menu.

Main Menu

Calibrate

Config

Service

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