GLI International Accu4 Operating Instructions Manual

OPERATING INSTRUCTION MANUAL

Accu4™

Low-range

Turbidimeter System

(Model T53 Analyzer and 8320 Sensor)

Worldwide Headquarters and Sales:

GLI International, Inc.

9020 West Dean Road
Milwaukee, Wisconsin 53224
U.S.A.

In the interest of improving and updating its equipment, GLI reserves the right to alter specifications to equipment at any time.

Rev. 2-300 Accu4™ Low-range T urbidimeter Sys tem

Phone:
Fax:
E-mail:
Web:

Represented By:

[414] 355-3601
[414] 355-8346
[e-mail]
www.gliint.com

Viridor Instrumentation

A company

1

Accu4™ Low-range Turbidimeter System Rev. 2-300

2

IMPORTANT SAFETY INFORMATION

This measurement system is compliant with safety standards as outlined in:

FMRC Class Numbers 3600, 3611, and 3810 (U.S.A.)

CSA C22.2 No. 142 and C22.2 No. 213 (Canada)

EN 61010-1 (European Community)

Please read and observe the following:

•

Opening the analyzer door exposes you to line power voltage, if present, at terminals on TB2 and TB3

inside the enclosure. This may be hazardous. Always remove line power before entering this area in
the analyzer. However, the analyzer door assembly and the sensor contain only low voltages and are
completely safe to handle.

•

Wiring or repairs should only be performed by qualified personnel and only to an unpowered analyzer.

•

Whenever it appears that analyzer safety is questionable, disable the analyzer to ensure against any

unintended operation. For example, an unsafe condition is likely when:

1) The analyzer appears visibly damaged.

2) The analyzer fails to operate properly or provide the intended measurements.

3) The analyzer has been stored for long periods at temperatures above 158°F (70°C).

•

This measurement system must be installed by specially trained personnel in accordance with relevant

local codes and instructions contained in this operating instruction manual. Observe all technical
specifications of the system. If one line of the line power mains is not neutral, use a double-pole mains
switch to disconnect the analyzer.

HELPFUL IDENTIFIERS

In addition to information on installation and operation, this instruction manual may contain
WARNINGS pertaining to user safety, CAUTIONS regarding possible instrument malfunction, and
NOTES on important, useful operating guidelines.

WARNING:

A WARNING LOOKS LIKE THIS. IT WARNS YOU OF THE POTENTIAL
FOR PERSONAL INJURY.

CAUTION:

A CAUTION LOOKS LIKE THIS. IT ALERTS YOU TO POSSIBLE
INSTRUMENT MALFUNCTION OR DAMAGE.

☞

NOTE: A note looks like this. It alerts you to important operating

information.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

3

Definition of Equipment Symbols

This symbol

means CAUTION

and alerts you to possible danger or

instrument malfunction. Refer to this manual before proceeding.

This symbol

means that this is a protective ground terminal

alerts you to connect an earth ground to it.

This symbol

means that there is alternating current present

alerts you to be careful.

and

and

WARRANTY

GLI International, Inc. warrants the Accu4™ Low-range Turbidimeter System to be free
from defects in material or workmanship for a period of 2 years (24 months) from the
date this product was shipped from our facility. A warranty claim will not be honored if
defects are not reported within the warranty period, or if GLI International determines that
defects or damages are due to normal wear, misapplication, lack of maintenance, abuse,
improper installation, alteration, or abnormal conditions. GLI International’s obligation
under this warranty shall be limited to, at its option, replacement or repair of this product.
The product must be returned to GLI International, freight prepaid, for examination. The
product must be thoroughly cleaned and any process chemicals removed before it will be
accepted for replacement or repair. GLI International’s liability shall not exceed the cost
of the product. Under no circumstances will GLI International be liable for any incidental
or consequential damages, whether to person or property. GLI International will not be li­able for any other loss, damage or expense of any kind, including loss of profits,
resulting from the installation, use, or inability to use this product.

Accu4™ Low-range Turbidimeter System Rev. 2-300

4

CONDENSED OPERATING INSTRUCTIONS

This manual contains details for all operating aspects of the Accu4™ Low-range Turbidimeter System.
The following condensed instructions are provided to assist you in getting the system started up and op­erating as quickly as possible.

measurement operation.

To use specific analyzer features, refer to the appropriate sections in this

manual for instructions.

1. CONNECTING SENSOR

After the T53 analyzer is properly mounted (Part Two, Section 2.5), connect the GLI Model 8320 low­range turbidity sensor, matching wire colors to terminals as indicated:

These condensed instructions only pertain to basic turbidity

Sensor Wire

Colors

Inner Shield Grounding strip lug Terminal #11 on TB1

Red Terminal #12 on TB1 Terminal #12 on TB1

Violet Terminal #13 on TB1 Terminal #13 on TB1
Green Terminal #14 on TB1 Terminal #14 on TB1
White Terminal #15 on TB1 Terminal #15 on TB1

Yellow Terminal #16 on TB1 Terminal #16 on TB1

Inner Shield Grounding strip lug Terminal #17 on TB1

Brown Terminal #18 on TB1 Terminal #18 on TB1

Gray Terminal #19 on TB1 Terminal #19 on TB1

Blue Terminal #20 on TB1 Terminal #20 on TB1

Black Terminal #21 on TB1 Terminal #21 on TB1

Orange Terminal #22 on TB1 Terminal #22 on TB1

Analyzers with

“B” Prefix Serial No.

Analyzers with

No Letter Prefix Serial No.

2. CONNECTING LINE POWER

Important:

Follow the instructions in Part Two, Section 3.5 to connect line power to the analyzer.

3. ADJUSTING DISPLAY CONTRAST

Ambient lighting conditions may make it necessary to adjust display contrast to improve visibility.
With the MEASURE screen displayed, press and hold

×

Ø

×

or

until attaining the desired contrast.

key

Ø

ENTER key

the

and simultaneously press the

4. CALIBRATING SYSTEM

Always initially

calibrate

the Accu4™ Low-range Turbidimeter System to ensure accurate meas­urement. Any time thereafter, you can conveniently check system calibration using an optional
accessory Cal-CubeTM assembly.

•

When you need to calibrate with a

method. GLI only guarantees measurement accuracy when a 40 NTU formazin suspension is used
as the primary standard.

•

When calibration need not conform to USEPA requirements

method (requires optional GLI CAL-CUBE™ assembly) or the “SAMPLE CAL” method.

Refer to Part Three, Section 5 for instructions on all calibration methods.

5. COMPLETING ANALYZER CONFIGURATION

To further configure the analyzer to your application requirements, use the appropriate CONFIGURE
screens to make selections and “key in” values. Refer to Part Three, Section 4 for complete configu­ration details.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

primary standard

5

, use the “PRIMARY CAL” calibration

, use the “CUBE CAL” calibration

Accu4™ Low-range Turbidimeter System Rev. 2-300

6

TABLE OF CONTENTS

PART ONE - INTRODUCTION

SECTION 1 GENERAL INFORMATION

1.1 Capability Highlights ........................................................................13-15

1.2 Modular Construction ............................................................................15

1.3 Retained Configuration Values .............................................................15

1.4 Analyzer and Sensor Serial Numbers ...................................................15

1.5 EMI/RFI Immunity.................................................................................. 16

SECTION 2 SPECIFICATIONS

....................................................................................17-18

PART TWO - INSTALLATION

SECTION 1 UNPACKING

SECTION 2 MECHANICAL REQUIREMENTS

2.1 Sensor Location ...............................................................................19-20

2.2 Sensor Mounting ..............................................................................20-21

2.3 Sensor Plumbing Connections ..............................................................22

2.4 Analyzer Location..................................................................................23

2.5 Analyzer Mounting............................................................................23-24

2.6 Sensor and Analyzer Conduit Hole Requirements................................ 24

SECTION 3 ELECTRICAL CONNECTIONS

3.1 GLI Model 8320 Low-range Turbidity Sensor...................................25-27

3.2 Analog Outputs......................................................................................28

3.3 Relay Outputs...................................................................................28-29

3.4 Closed Contact TTL Input .....................................................................29

3.5 Line Power .......................................................................................30-31

.................................................................................................19

PART THREE - OPERATION

SECTION 1 USER INTERFACE

1.1 Display ..................................................................................................32

1.2 Keypad .............................................................................................32-33

1.3 MEASURE Screen (normal display mode)............................................ 34

SECTION 2 MENU STRUCTURE

2.1 Displaying Main Branch Selection Screen ............................................35

2.2 Displaying Top-level Menu Screens.................................................35-36

2.3 Displaying Submenu Screens ...............................................................36

2.4 Adjusting Edit/Selection Screen Values ...........................................36-37

2.5 Entering (Storing) Edit/Selection Screen Values/Choices.....................37

Rev. 2-300 Accu4™ Low-range Turbidimeter System

7

TABLE OF CONTENTS (continued)

SECTION 3 ADJUSTING DISPLAY CONTRAST

SECTION 4 CONFIGURING THE ANALYZER

4.1 Selecting LANGUAGE to Operate Analyzer.......................................... 38

4.2 Configuring Sensor Characteristics:

SELECT UNITS ..........................................................................38-39

SET FILTER Time............................................................................ 39

Select PULSE SUPPRESS (on/off)..................................................40

ENTER NOTE (top line of MEASURE screen).................................40

4.3 Configuring Analog Outputs (1 and 2):

SET 0/4 and 20 mA VALUES......................................................41-42

SET TRANSFER Value (mA)........................................................... 42

SET FILTER Time............................................................................ 43

Select SCALE 0 mA/4 mA (low endpoint) ........................................43

4.4 Configuring Relays (A, B, C, and D):

SET FUNCTION Mode (alarm, control, or status).......................44-45

SET TRANSFER Mode (relay on or off) ..........................................46

SET ACTIVATION (configuration values) ...................................46-48

4.5 SET PASSCODE (feature enabled or disabled) ...................................48

4.6 Configuration Settings Summary (ranges/choices and defaults) ..........49

.............................................................37

SECTION 5 CALIBRATING THE ANALYZER

5.1 Things to Know About Calibration ....................................................50-51

5.2 PRIMARY CAL Method (requires formazin suspension):

Preparing Formazin Solution ......................................................51-52

Filling Sensor..............................................................................52-54

Entering Value .................................................................................54

Resuming Operation ...................................................................54-55

5.3 CUBE CAL Method (requires optional Cal-CubeTM assembly):

TM

Inserting Cal-Cube

Assembly ..................................................55-56

Entering Value ............................................................................56-57

Resuming Operation ........................................................................57

5.4 SAMPLE CAL Method (requires sample with value

determined by laboratory analysis or portable meter)......................57-59

5.5 Analog Outputs (1 and 2) Calibration...............................................59-60

SECTION 6 TEST/MAINTENANCE

6.1 STATUS Checking (analyzer, sensor, and relays)...........................61-63

6.2 CHECK CAL/HOLD Outputs ............................................................63-64

6.3 OVERFEED RESET (relay timers)........................................................ 65

6.4 OUTPUT (1 and 2) Analog Test Signals ..........................................65-66

6.5 RELAY (A, B, C, and D) Operating Test................................................66

6.6 SENSOR TYPE Checking................................................................66-67

6.7 EPROM VERSION Checking ................................................................67

Accu4™ Low-range Turbidimeter System Rev. 2-300

8

TABLE OF CONTENTS (continued)

6.8 SIM SENSOR Setting.......................................................................67-68

6.9 RESET DEFAULTS............................................................................... 68

SECTION 7 RELAY OVERFEED TIMER FEATURE

7.1 Why Use an Overfeed Timer................................................................. 69

7.2 Configuring Relay Overfeed Timers......................................................69

7.3 Overfeed Timer “Timeout” Operation .................................................... 69

7.4 Resetting Overfeed Timers ...................................................................69

7.5 Interactions with Other Analyzer Functions......................................69-70

SECTION 8 HART OPTION

8.1 Introduction ...........................................................................................71

8.2 Analyzer Operating Modes for HART Network.................................72-73

8.3 SINGLE MODE (Point-to-Point) Wiring Arrangement ...........................73

8.4 MULTI-DROP Wiring Arrangement.......................................................74

8.5 HART Preferences Setup:

Changing Polling Address ...............................................................75

Viewing Number of Required Preambles ....................................75-76

8.6 Device Preferences Setup:

Viewing Final Assembly Number ..................................................... 76

Viewing Model Number...............................................................76-77

Viewing Manufacturer ......................................................................77

Assigning a Tag ...............................................................................77

Assigning a Descriptor ..................................................................... 78

Assigning a Message....................................................................... 78

Assigning User-defined Date ......................................................78-79

Viewing Identification (ID) ................................................................79

Viewing Revisions............................................................................ 79

8.7 “Master Reset” Function........................................................................ 80

8.8 “Refresh” Function ................................................................................80

8.9 Protocol Command Set for PC Programming........................................ 80

PART FOUR - SERVICE AND MAINTENANCE

SECTION 1 GENERAL INFORMATION

1.1 Cleaning Sensor Flow Chamber ......................................................81-82

1.2 Cleaning Optional Cal-CubeTM Assembly.............................................. 82

1.3 Replacing Sensor Light Source or Detector:

Removing Inoperative Part ..............................................................83

Installing New Part ......................................................................83-84

Re-calibrating Measurement System............................................... 84

1.4 Replacing Fuse(s) .................................................................................85

1.5 Replacing Relays ..................................................................................85

1.6 Inspecting Sensor Cable .......................................................................85

Rev. 2-300 Accu4™ Low-range Turbidimeter System

9

TABLE OF CONTENTS (continued)

SECTION 2 PRESERVING MEASUREMENT ACCURACY

2.1 Eliminating Bubbles in Sensor Flow Chamber:

Restricting Sensor Outlet .................................................................86

Using an External Bubble Trap ........................................................86

2.2 Keeping Sensor Flow Chamber Clean ..................................................87

2.3 Keeping System Calibrated...................................................................87

2.4 Avoiding Electrical Interference.............................................................87

SECTION 3 TROUBLESHOOTING

3.1 System Diagnostic Condition Messages ............................................... 88

3.2 Isolating the Problem:

Checking Electrical Connections ..................................................... 89

Checking Operation Using System Diagnostics ..............................89

SECTION 4 ANALYZER REPAIR/RETURN

4.1 Customer Assistance.............................................................................90

4.2 Repair/Return Policy .............................................................................90

PART FIVE - SPARE PARTS AND ACCESSORIES

.................................................................................................................91

Accu4™ Low-range Turbidimeter System Rev. 2-300

10

TABLE OF CONTENTS (continued)

ILLUSTRATIONS

Figure 1-1

Figure 2-1

Figure 2-2

Figure 2-3

Figure 2-4

Figure 2-5

Figure 2-6

Figure 2-7

Figure 2-8

Figure 2-9

Figure 2-10

Figure 2-11

Figure 2-12

Figure 2-13

Figure 2-14

Figure 2-15

Figure 2-16

Figure 2-17

Figure 2-18

Figure 3-1

Figure 3-2

Figure 3-3

Figure 3-4

Figure 4-1

Figure 4-2

Figure 4-3

EMI/RFI Immunity Diagram ..................................................................................................16

Recommended Closed-loop Sensor Piping Arrangement...................................................... 19

Recommended Sample Bypass Line Sensor Piping Arrangement ........................................ 20

Standard Design Model 8320 Sensor -- Installation Dimension Details..................................21

High Pressure Design Model 8320 Sensor -- Installation Dimension Details.......................... 21

Sampling Point Guidelines for Process Pipe Plumbing Connection.......................................22

Analyzer Mounting Arrangements ......................................................................................... 23

Analyzer Installation Dimension Details ................................................................................ 24

Terminal Block Designations for Analyzers with “B” Prefix Serial Number.............................26

Terminal Block Designations for Analyzers with No Letter Prefix Serial Number ................... 26

Connecting Model 8320 Low-range Turbidity Sensor to

Analyzers with “B” Prefix Serial Number...............................................................................27

Connecting Model 8320 Low-range Turbidity Sensor to

Analyzers with No Letter Prefix Serial Number .....................................................................27

Connecting Control/Alarm Device(s) to Electromechanical Relay(s) .....................................29

Connecting 115 V Single Phase to Analyzers with “B” Prefix Serial Number.........................30

Connecting 115 V Single Phase to Analyzers with No Letter Prefix Serial Number ...............30

Connecting 230 V Single Phase to Analyzers with “B” Prefix Serial Number.........................31

Connecting 230 V Single Phase to Analyzers with No Letter Prefix Serial Number ...............31

Connecting 230 V Split Phase to Analyzers with “B” Prefix Serial Number............................ 31

Connecting 230 V Split Phase to Analyzers with No Letter Prefix Serial Number .................. 31

Analyzer Keypad ..................................................................................................................33

Location of SINGLE MODE/MULTI-DROP Switch (HART-equipped analyzers only).............73

HART SINGLE MODE (Point-to-Point) Wiring Arrangement (for single analyzer) .................73

HART MULTI-DROP Wiring Arrangement (for multiple analyzer network) ............................ 74

Standard Design Sensor -- Component Details ..................................................................... 81

High Pressure Design Sensor -- Component Details .............................................................82

Turbidity Sensor Terminal Block Designations...................................................................... 84

Table A

Table B

Table C

Table D

Rev. 2-300 Accu4™ Low-range Turbidimeter System

Relay Configuration Settings ...........................................................................................46-47

Analyzer Configuration Settings (Ranges/Choices and Defaults) ..........................................49

Relay Overfeed Timer Interactions with Other Analyzer Functions........................................70

System Diagnostic Condition Status Screens/Meanings........................................................88

TABLES

11

Accu4™ Low-range Turbidimeter System Rev. 2-300

12

PART ONE - INTRODUCTION SECTION 1 - GENERAL INFORMATION

PART ONE - INTRODUCTION

ECTION

1.1 Capability Highlights

High Accuracy with

Minimal Maintenance

S

GENERAL INFORMATION

The Accu4™ Low-range Turbidimeter System employs a
technologically-advanced sensor to provide high measure­ment accuracy and stability, while reducing maintenance
requirements. It is designed to meet the International Stan­dards For Measurement of Turbidity [ISO 7027-1984(E)]
and USEPA-approved GLI Method 2. This system has an
auto-ranging measuring scale, enabling continuous moni­toring over a 0.000-100.0 NTU range with automatic
decimal point positioning.

dimeter System automatically provides increasing
display resolution as measured turbidity decreases.

further ensure high measuring accuracy, the Model 8320
sensor eliminates air or gas bubbles in the sample with its
built-in bubble trap. The system is ideal for critical monitor­ing and controlling applications including potable water,
filtered water, and final product clarity.

1

The Accu4™ Low-range Turbi-

To

MEASURE Screen

Passcode-protected

Access

Calibration Methods

With the display in the normal MEASURE screen mode, the
measured turbidity is always shown on the main middle line.
The bottom auxiliary display line, shown in reverse video,
can be changed by pressing the
these measurements:

• Analog Output 1 value (mA)

• Analog Output 2 value (mA)

For security, you can enable a passcode feature to restrict
access to configuration and calibration settings to author­ized personnel only. See Part Three, Section 4.5 for details.

Three methods are available to calibrate the system. See
Part Three, Section 5.1 for details. With the optional Cal-

Cube™ assembly, you can conveniently check calibra­tion any time (Section 6.2). The mA value for each analog

output can also be calibrated (Section 5.5).

ØØ and

×× keys to show

Rev. 2-300 Accu4™ Low-range Turbidimeter System

13

PART ONE - INTRODUCTION SECTION 1 - GENERAL INFORMATION

Analog Outputs

Relays

The analyzer provides two isolated analog outputs (1 and

2). Each output represents the measured turbidity, and can
be set to be 0-20 mA or 4-20 mA.

Turbidity values can be entered to define endpoints at which
the minimum and maximum analog output values are desired.

During calibration, both analog outputs can be selected to:

•

Hold their present values (HOLD OUTPUTS).

•

Transfer to preset values to operate control elements by an

amount corresponding to those values (XFER OUTPUTS).

•

Remain active to respond to the measured turbidity

(ACTIVE OUTPUTS).

For complete analog output setup details, including transfer
setup, refer to Part Three, Section 4.3.

The analyzer has four electromechanical relays with SPDT
contacts. Each relay can be set to function as a CONTROL,
ALARM (dual-alarm), or STATUS relay. CONTROL and
ALARM relays operate in response to the measured turbid­ity. STATUS relays operate only in response to selected
system diagnostic conditions.

☞

NOTE: Relay D is factory-set to function as a STATUS re-

lay but can be configured as a CONTROL or
ALARM relay.

When a relay is set to function as a STATUS relay, it be­comes a dedicated system diagnostic-only alarm relay. A
STATUS relay can be configured for:

•

FAIL mode -- sets STATUS relay to activate when there

is a FAIL condition (analyzer, light source or detector) or
a sensor CHAMBER UNKNOWN condition.

•

WARN mode -- sets STATUS relay to activate only when

there is a sensor flow CHAMBER DIRTY condition.

•

ALL mode -- sets STATUS relay to activate when there

is any abnormal system condition (any FAIL condition,
or sensor CHAMBER DIRTY or UNKNOWN condition).

A “WARNING CHECK STATUS” message automatically
flashes on the MEASURE screen whenever the analyzer
detects any of these system diagnostic conditions:

Accu4™ Low-range Turbidimeter System Rev. 2-300

14

PART ONE - INTRODUCTION SECTION 1 - GENERAL INFORMATION

1.2 Modular Construction

•

ANALYZER FAIL

•

CHAMBER DIRTY

•

CHAMBER UNKNOWN

•

SOURCE 1 FAIL

•

SOURCE 2 FAIL

•

DETECT 1 FAIL

•

DETECT 2 FAIL

To determine the condition causing the warning message,
display the “STATUS screens” in the TEST/MAINT menu
branch. For more details, refer to Part Three, Section 6.1.

During calibration, CONTROL and ALARM relay on/off
states are affected in the same way as the analog outputs
by the “(HOLD/XFER/ACTIVE) OUTPUTS” screen selec­tion. These relays are also held at their present on/off
states, transferred to desired preset on/off states, or remain
active to respond to measured turbidity. For complete relay
setup details, including transfer setup, see Part Three, Sec­tion 4.4.

The modular construction of the analyzer simplifies field
servicing and provides electrical safety. The front door/
keypad assembly and the sensor use voltages no greater
than 24 VDC, and are completely safe to handle.

1.3 Retained
Configuration Values

1.4 Analyzer and Sensor
Serial Numbers

Opening the analyzer door accesses terminals inside the
enclosure for electrical connections. Line power must be
connected to specifically designated terminals on TB3.

WARNING:

REMOVE LINE POWER BEFORE NEARING THIS AREA
TO AVOID ELECTRICAL SHOCK.

All user-entered configuration values are retained indefi­nitely, even if power is lost or turned off. The non-volatile
analyzer memory does not require battery backup.

A label with the analyzer model number, serial number,
build date, and other items is affixed to the top of the ana­lyzer enclosure. A similar label is affixed to the sensor.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

15

PART ONE - INTRODUCTION SECTION 1 - GENERAL INFORMATION

1.5 EMI/RFI Immunity

The analyzer is designed to provide protection from most
normally encountered electromagnetic interference. This
protection exceeds U.S. standards and meets European
IEC 801-series testing for electromagnetic and radio fre­quency emissions and susceptibility. Refer to Figure 1-1
and the specifications in Section 2.2 for more information.

Accu4™ Low-range Turbidimeter System Rev. 2-300

FIGURE 1-1 EMI/RFI Immunity Diagram

16

PART ONE - INTRODUCTION SECTION 2 - SPECIFICATIONS

ECTION

S

2

SPECIFICATIONS

2.1 Model 8320 Low-range

Turbidity Sensor

Operational

Mechanical

2.2 Model T53 Analyzer

Operational

Flow Rate................................... 0.05 to 7 GPM (0.19 to 26.5 LPM)

Ambient Conditions .................... 32-140°F (0-60°C)

Sample Temperature Range....... 32-140°F (0-60°C)

Pressure Range:

Standard Sensor Design........ 0-50 psig at 68°F (0-3.4 bar at 20°C)

High Pressure Design............ 0-150 psig at 68°F (0-10.2 bar at 20°C)

Pressure Drop:

Standard Sensor Design........ 0.0017 psig at 0.1 GPM (0.0001 bar at 0.36 LPM)

High Pressure Design............ 0.165 psig at 1.0 GPM (0.012 bar at 3.8 LPM)

Residence Time ......................... 9.5 seconds at 1 GPM (3.8 LPM)

Air Venting ................................. Integral bubble trap for 0.05 to 0.5 GPM (0.19 to

1.8 LPM) flows. Installation of restrictor valve on
the sensor outlet is recommended for flows
above 0.5 GPM (1.8 LPM) with air in sample.

Light Sources............................. Two near-infrared (860 nM wavelength) LEDs

Sensor Flow Configuration ......... Flow-through design

Process Connections.................. 1/2 inch NPT female standard; adaptable to

3/8 inch or 1/4 inch NPT, barb or tube fittings

Wetted Materials........................ PVC, polycarbonate, polystyrene, PPO,

nitrile, and Buna-N

Cleaning Method ........................ Water rinse, wipe surfaces

Enclosure:

Standard Sensor Design ....... NEMA 4X (≅ CSA type 4; ≅ IP65), molded and

fiberglass-reinforced polyester (flame retardant)
with four integral tabs for surface mounting

High Pressure Design............ NEMA 4X (≅ CSA type 4; ≅ IP65), PPO struc-

tural foam (V-0 flammability rating per U.L. 94

test) with four integral tabs for surface mounting

Mounting Configurations............. Surface or pipe mount

Net Weight................................. 10 lbs. (4.5 kg) approximately

Display....................................... Graphic dot matrix LCD, 128 x 64 pixels with

LED backlighting; 1/2 inch (13 mm) main

character height; 1/8 inch (3mm) auxiliary

information character height; menu screens

contain up to six text lines

Measurement Auto-ranging Scale

Turbidity................................ 0.000-100.0 NTU with auto-ranging and decimal

point shift above 1.000 NTU and 10.00 NTU

(same for other measurement units)

mA Outputs (1 and 2)............ 0.00-20.00 mA or 4.00-20.00 mA

Rev. 2-300 Accu4™ Low-range Turbidimeter System

Ambient Conditions:

Operation.............................. -4 to +140°F (-20 to +60°C); 0-95% relative

humidity, non-condensing

Storage................................. -22 to +158°F (-30 to +70°C); 0-95% relative

humidity, non-condensing

Relays: Types/Outputs ...................Four electromechanical relays; SPDT (Form C)

contacts; U.L. rated 5A 115/230 VAC, 5A @ 30

VDC resistive

Operational Mode ..............Each relay (A, B, C, and D) can be assigned to be

driven by the measured turbidity or diagnostics

Function Modes:

Control...................... Settings for high/low phasing, setpoint, dead-

band, overfeed timer, off delay, and on delay

17

PART ONE - INTRODUCTION SECTION 2 - SPECIFICATIONS

Alarm ...........................Settings for low alarm point, low alarm point

deadband, high alarm point, high alarm point

deadband, off delay, and on delay

Status....................... Setting for FAIL, WARN or ALL system diag-

nostic conditions to activate relay when

specific conditions exist (analyzer, light source

1/2 or detector 1/2 failure, sensor chamber

dirty or sensor chamber unknown)

Indicators...........................Relay annunciators (A, B, C, and D) indicate

respective relay on/off status

Sensor-to-Analyzer Distance ...... 30 ft. (9 m) maximum (consult factory if

longer distances are required)

Power Requirements .................. 90-130 VAC, 50/60 Hz. (10 VA max.) or

180-260 VAC, 50/60 Hz. (10 VA max.)
Calibration Methods:

PRIMARY............................... Enter one primary standard value (formazin

suspension is recommended).

CUBE CAL ............................. Temporarily insert an optional Cal-Cube

TM

assembly into the sensor and enter its factory-

certified standard value.

SAMPLE................................. Enter one sample value determined by labo-

ratory analysis or calibrated portable meter.

Analog Outputs .......................... Two isolated 0/4-20 mA outputs; each with

0.004 mA (12-bit) resolution and capability to

drive up to 600 ohm loads

NOTE:

Each output represents the measured turbidity. Turbidity values can
be entered to define the endpoints at which the minimum and maxi­mum mA output values are desired. During calibration, both outputs
can be selected to hold their present values, transfer to preset val­ues to operate control elements by an amount corresponding to
those values, or remain active to respond to the measured turbidity.

Communication: RS-232 ........... Enables configuration and retrieval of measured

data for one analyzer using an IBM-compatible

PC and optional GLI software tool kit

HART.............. Enables configuration and retrieval of measured

data for up to 15 analyzers over communication

link using appropriate hand-held terminal or data

system with HART software

Memory Backup (non-volatile) .... All user settings are retained indefinitely in

memory (EEPROM)

EMI/RFI Conformance................ Meets European standards for conducted and

radiated emissions and immunity; certified CE

compliant for applications as specified by EN 50081-1

for emissions and EN 50082-2 for immunity
Electrical Certifications:

General Purpose (pending) ..... UL, C-UL, FM, and CENELEC

Division 2 (pending)................ UL, C-UL, and FM: Groups A, B, C, D, F, and G

Zone 2 (pending) .................... CENELEC: Group IIC

Mechanical

2.3 Accu4™ Turbidimeter
System Performance
(electrical, analog outputs)

Accu4™ Low-range Turbidimeter System Rev. 2-300

Enclosure................................... NEMA 4X; polycarbonate face panel, epoxy-

coated cast aluminum door and case with
four 1/2 inch (13 mm) conduit holes, nylon
mounting bracket, and stainless hardware

Mounting Configurations............. Panel, surface, and pipe mounting

Net Weight................................. 5 lbs. (2.3 kg) approximately

System Accuracy ....................... ± 2% of reading, all ranges

Sensitivity .................................. 0.001 NTU

Repeatability .............................. 0.1% of span or better

Temperature Drift....................... Zero and Span: 0.01% of span per °C

18

PART TW O - INSTALLATION SECTION 1 - UNPACKING

PART TWO - INSTALLATION

ECTION

S

UNPACKING

After unpacking, it is recommended to save the shipping
carton and packing materials in case the instrument must be
stored or re-shipped. Inspect the equipment and packing
materials for signs of shipping damage. If there is any evi­dence of damage, notify the transit carrier immediately.

ECTION

S

MECHANICAL REQUIREMENTS

1

2

2.1 Sensor Location

Locate the Model 8320 turbidity sensor indoors or outdoors
within 30 ft. (9 m) of where the Model T53 analyzer is to be
installed. The sensor may be installed in an “in line” process
configuration using a closed loop piping arrangement (Fig­ure 2-1) or in a sample bypass line configuration using an
open drain piping arrangement (Figure 2-2).

FIGURE 2-1 Recommended Closed-loop Sensor Piping Arrangement

Rev. 2-300 Accu4™ Low-range Turbidimeter System

19

PART TW O - INSTALLATION SECTION 2 - MECHANICAL REQUIREMENTS

FIGURE 2-2 Recommended Sample Bypass Line Sensor Piping Arrangement

2.2 Sensor Mounting

☞

The Model 8320 low-range turbidity sensor may the stan­dard design sensor (Figure 2-3) or the high pressure design
sensor which is housed in a different enclosure (Figure
2-4). In either case, vertically orient the sensor (inlet fitting
at bottom) and surface mount it where there is little or no
mechanical vibration. Use 1/4 inch screws to fasten the en­closure onto a flat surface. (The sensor may be mounted
onto a vertical or horizontal 1-1/2 inch or 2 inch diameter
pipe using an optional GLI pipe mount kit. Refer to Part Five

-- Spare Parts -- for the GLI part number.

NOTE:

Avoid locations where Model 8320 ambient tempera­ture limits (32-140°F; 0-60°C) may be exceeded.

Accu4™ Low-range Turbidimeter System Rev. 2-300

20

PART TW O - INSTALLATION SECTION 2 - MECHANICAL REQUIREMENTS

Note:

Dimensions shown in inches (mm).

FIGURE 2-3 Standard Design Model 8320 Sensor -- Installation Dimension Details

Note:

Dimensions shown in inches (mm).

FIGURE 2-4 High Pressure Design Model 8320 Sensor -- Installation Dimension Details

Rev. 2-300 Accu4™ Low-range Turbidimeter System

21

PART TW O - INSTALLATION SECTION 2 - MECHANICAL REQUIREMENTS

2.3 Sensor Plumbing

Connections

☞

Plumb the process into the Model 8320 sensor inlet fitting.
Plumb the sensor outlet fitting back into the process line
(Figure 2-1) or to an open drain (Figure 2-2). Bushings may
be used to reduce to a smaller pipe size. Barb or tube fit­tings may be installed.
sample tubing for applications in which sediment buildup
commonly occurs. The resultant faster flow rate helps flush
sediment through the sensor.

NOTE: Use Teflon tape to seal the inlet and outlet connec-

tions. Do not use pipe dope or other liquid sealants.
Recommendation: Use ball valves (V1 designa­tions in Figure 2-1 and 2-2) to conveniently isolate
the sensor when calibrating or removing the sensor.
In a closed-loop piping arrangement (Figure 2-1),
3-way valves (V2 designations) are required to con­veniently drain the flow chamber during calibration.
A bypass line piping arrangement (Figure 2-2) only
requires one 3-way valve.

CAUTION: WHEN USING METAL FITTINGS, DO NOT
EXCESSIVELY TIGHTEN THEM ONTO THE SENSOR’S
PLASTIC INLET AND OUTLET -- THEY MAY CRACK.

Recommendation:

Use larger

☞

NOTE: When choosing the sampling point for the process

pipe plumbing connection, avoid a top-of-pipe or
bottom-of-pipe location. Figure 2-5 illustrates the
best sampling point location: side-of-pipe with sam­ple line inserted to the process pipe centerline.

Figure 2-5 Sampling Point Guidelines for Process Pipe Plumbing Connection

Accu4™ Low-range Turbidimeter System Rev. 2-300

22

PART TW O - INSTALLATION SECTION 2 - MECHANICAL REQUIREMENTS

2.4 Analyzer Location

2.5 Analyzer Mounting

1. Locate the analyzer as close as possible to the installed
sensor. Do not exceed a maximum distance of 30 feet
(9 m) between the sensor and analyzer. (Consult fac­tory if longer distances are required.)

2. Mount the analyzer in a location that is:

➥

Clean and dry where there is little or no vibration.

➥

Protected from corrosive fluids.

➥

Within ambient temperature limits (-4 to +140°F or

-20 to +60°C).

CAUTION:

EXPOSING THE ANALYZER TO DIRECT
SUNLIGHT MAY INCREASE THE OPERATING
TEMPERATURE ABOVE ITS SPECIFIED LIMIT.

Figure 2-6 illustrates various ways to mount the analyzer
using the supplied bracket and hardware. Determine the
mounting method and attach the hardware as shown in the
respective illustration. Refer to Figure 2-7 for analyzer in­stallation dimension details.

FIGURE 2-6 Analyzer Mounting Arrangements

Rev. 2-300 Accu4™ Low-range Turbidimeter System

23

PART TW O - INSTALLATION SECTION 2 - MECHANICAL REQUIREMENTS

FIGURE 2-7 Analyzer Installation Dimensions Details

2.6 Sensor and Analyzer
Conduit Hole
Requirements

☞

Accu4™ Low-range Turbidimeter System Rev. 2-300

Recommendation:

lyzer in 1/2-inch, grounded metal conduits. If using only
shielded cables, appropriate strain reliefs or cable grips are
required. (GLI sells accessory cable grips, part number
3H1091, and watertight locknuts, part number 3H1230, for
cable entries.) Seal unused cable entry holes with appropri­ate plugs.

NOTE:

Use NEMA 4 (≅ CSA type 4; ≅ IP65) rated fittings

Run all wiring to the sensor and ana-

and plugs to maintain the watertight integrity of the
NEMA 4X sensor and analyzer enclosures, and to
comply with Div. 2 hazardous area requirements.

24

PART TW O - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS

ECTION

S

ELECTRICAL CONNECTIONS

To access terminal blocks for electrical connections, open
the left-hinged enclosure door by unscrewing the four fas­teners. Figure 2-8 or 2-9 shows the terminal block
arrangement and terminal designations inside the analyzer.

3

☞

☞

☞

NOTE: All terminals are suitable for single wires up to 14

AWG (2.5 mm2).

Wiring Tip!

electromagnetic compatibility requirements, follow these
general wiring guidelines:

1. Keep all cable shields as short as possible inside
the analyzer, and connect them to the ground termi­nals provided. Performance may be improved by
using cable glands that enable the shield to directly
contact the analyzer chassis.

2. Use Steward ferrite 28 B0590-000 or equivalent on
the sensor cable -- two turns required.

3. In harsh conducted RF conditions, connect the earth
ground of the analyzer to a local, known earth
ground source.

NOTE: For ease of wiring, route line power and relay out-

To comply with European Community (CE)

puts through the back conduit holes, and use the
front conduit holes for all other wiring.

3.1 GLI Model 8320
Low-range
Turbidity Sensor

☞

☞

Rev. 2-300 Accu4™ Low-range Turbidimeter System

The Model 8320 sensor is supplied with LED light source
and detector cables connected to its terminal board. Re­move its protective cover to check that these cables have
not been accidentally disconnected during shipment (refer
to wiring diagram on inside of sensor enclosure door).

Wiring Tip!

grounded metal conduit to protect it from moisture,
electrical noise, and mechanical damage.

NOTE: Do not route sensor cable in any conduit containing

AC power wiring (“electrical noise” may interfere
with sensor signal). Also, always re-calibrate the
system when the cable length between sensor and
analyzer changes.

Route the sensor cable in 1/2-inch,

25

PART TW O - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS

OUTPUT 2

RELAY A

NC COM

RS-232

TX RX

NO

3312 5476

4-20 mA

OUTPUT 1

-+-

+

HART

234567

TB2

TURBIDITY INTERCONN ECT

TTL

+

GND

GND

ORANGE

2189 2210 1920 1618

TURBIDITY ANA LYZER

RELAY B

RELAY C

COMNC NCNO

POWER

90-130 VAC
180-260 VAC
10VA 50/60 Hz

COM

8

BLUE

BROWN

F

80mA

T

WHITE

F

2

100mA

T

VIOLET

GREEN

131415 12

115230 N

RED

YELLOW

1

BLACK

GRAY

RELAY D

NCNO NOCOM

1091211 342

TB1

TB3

FIGURE 2-8 Terminal Block Designations for Analyzers with “B” Prefix Serial Number

7% 785%,',7< 6(1625 +22.83



          

5('

6+,(/'

9,2/(7

:+,7(

*5((1

6+,(/'

<(//2:

%/8(

*5$<

%/$&.

%52:1

7/  

25$1*(

FIGURE 2-9 Terminal Block Designations for Analyzers with No Letter Prefix Serial Number

Accu4™ Low-range Turbidimeter System Rev. 2-300

26

PART TW O - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS

Refer to Figure 2-10 or 2-11 and connect the sensor (or in­terconnect) cable wires to appropriate terminals on TB1,
matching colors as indicated.

TURBIDITY INTERCONNECT

TB1

BLUE

BLACK

ORANGE

2122 1920 1618

GRAY

BROWN

YELLOW

VIOLET

WHITE

GREEN

RED

131415 12

FIGURE 2-10 Connecting Model 8320 Low-range Turbidity Sensor

to Analyzers with “B” Prefix Serial Number

FIGURE 2-11 Connecting Model 8320 Low-range Turbidity Sensor

to Analyzers with No Letter Prefix Serial Number

Rev. 2-300 Accu4™ Low-range Turbidimeter System

27

PART TW O - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS

3.2 Analog Outputs

☞

Two isolated analog outputs (1 and 2) are provided. Each
output represents the measured turbidity, and can be set to
be 0/4-20 mA.

and earth ground, but not from each other.

configuring the outputs, refer to Part Three, Section 4.3.

Wiring Tip!

cable for connecting the analog outputs. To protect the
output signal from EMI/RFI, connect cable shields to:



The grounding strip at bottom of case (5 open holes,
Fig. 2-8) for analyzers with “B” prefix serial number.



The “ground symbol” Terminal 1 on TB1 (Figure 2-9)
for analyzers with no letter prefix serial number.

Each 0/4-20 mA output can drive a load of up to 600 ohms.

• Output 1: Connect the load to Terminals 2 and 3 on TB1,
matching polarity as indicated.

The outputs are isolated from the inputs

For details on

Use high quality, shielded instrumentation

3.3 Relay Outputs

☞

• Output 2: Connect the load to Terminals 4 and 5 on TB1,
matching polarity as indicated.

NOTE: When using the HART communication option, a

digital signal is encoded onto the 4-20 mA analog
Output 1 signal. In a HART SINGLE MODE wiring
configuration, Output 1 remains available for normal
use. However, in a HART MULTI-DROP wiring con­figuration, Output 1 becomes dedicated to that
function and cannot be used. See Part Three, Sec­tion 8 for more HART communication information.

The analyzer is equipped with four electromechanical re­lays. For relay setup details, see Part Three, Section 4.4.

CAUTION:

DO NOT EXCEED THE CONTACT RATING FOR
EACH RELAY (5A 115/230 VAC). WHEN SWITCHING
LARGER CURRENTS, USE AN AUXILIARY RELAY
SWITCHED BY THE ANALYZER RELAY TO EXTEND
ANALYZER RELAY LIFE. WHEN USING RELAY
OUTPUTS, MAKE SURE THAT LINE POWER WIRING
CAN ADEQUATELY CONDUCT THE CURRENT
DRAW OF THE SWITCHED LOAD(S).

Accu4™ Low-range Turbidimeter System Rev. 2-300

28

PART TW O - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS

Four sets of SPDT relay outputs (Relays A, B, C, and D) are
provided at Terminals 1 through 12 on TB2.

puts are not powered.

The line power used to power the

The relay out-

analyzer may also be used to power the control or alarm
devices with these relay contacts. Refer to Figure 2-12 for a
general wiring arrangement. Always check control wiring to
insure that line power will not be shorted by the relay
switching action, and that wiring conforms to local codes.

WARNING:

MAKE SURE THAT LINE POWER IS NOT PRESENT
WHILE CONNECTING WIRES TO TB2 RELAY
TERMINALS.

3.4 Closed Contact
TTL Input

Rev. 2-300 Accu4™ Low-range Turbidimeter System

FIGURE 2-12 Connecting Control/Alarm Device(s) to

Electromechanical Relay(s)

The closed contact TTL input feature of the analyzer en­ables you to conveniently:

•

Hold the analog outputs at their present values.

•

Hold all CONTROL or ALARM relays at their present

on/off states.

To activate holding the analog outputs and relays, remotely
or locally jumper Terminals 9 and 10 on TB1.

29

PART TW O - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS

3.5 Line Power

☞

Refer to appropriate figures and connect line power to TB3
terminals using the standard three-wire connection ar­rangement.

codes

U.S.A.).

REMOVE LINE POWER WHILE CONNECTING LINE
POWER WIRES TO THE TB3 TERMINALS. ALSO,
USE ONLY THE STANDARD THREE-WIRE CONNEC­TION ARRANGEMENT FOR SINGLE-PHASE LINE
POWER TO PREVENT AN UNSAFE CONDITION, AND
TO ENSURE PROPER ANALYZER OPERATION.

Use wiring practices which conform to local

(example: National Electric Code Handbook in the

WARNING:

NOTE: In all cases, connect the line power cable ground

wire (usually green) to:



The grounding strip at bottom of case (5 open
holes -- Figures 2-13, 2-15, or 2-17) for analyz­ers with “B” prefix serial number.

☞

115230 N

342



The “ground symbol” Terminal 1 on TB3 (Figures
2-14, 2-16, or 2-18) for analyzers with no letter
prefix serial number.

The “115” and “230” voltage circuits are protected with in­ternal, board-mounted slow-blow fuses.

NOTE: For 230 volt split phase line power, be sure to con-

form to local codes with regard to fusing the 115
volt line connected to the “N” terminal.

FIGURE 2-13

Connecting 115 V Single Phase

to Analyzers with “B” Prefix Serial Number

Accu4™ Low-range Turbidimeter System Rev. 2-300

FIGURE 2-14

Connecting 115 V Single Phase

to Analyzers with No Letter Prefix Serial Number

30

PART TW O - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS

230 115 N

234

FIGURE 2-15

Connecting 230 V Single Phase

to Analyzers with “B” Prefix Serial Number

N115230

234

FIGURE 2-17

Connecting 230 V Split Phase

to Analyzers with “B” Prefix Serial Number

FIGURE 2-16

Connecting 230 V Single Phase

to Analyzers with No Letter Prefix Serial Number

FIGURE 2-18

Connecting 230 V Split Phase

to Analyzers with No Letter Prefix Serial Number

Rev. 2-300 Accu4™ Low-range Turbidimeter System

31

PART THREE - OPERATION SECTION 1 - USER INTERFACE

PART THREE - OPERATION

ECTION

S

USER INTERFACE

The user interface consists of an LCD display and a keypad

MENU, ENTER, ESC

with

1

,

ÕÕ,

ÖÖ,

××, and

ØØ keys.

1.1 Display

By using the keypad, you can display three basic types of
screens:

• MEASURE screen to show measured values. The meas-
ured turbidity is always shown on the display’s main
middle line. Pressing the
play’s bottom auxiliary line (in reverse video) to show the
Analog Output 1 or 2 value in mA.

An example of a typical MEASURE screen is:

On the MEASURE screen’s top line, Relay A, B, C, and D
annunciators will appear when their relay operational
state changes. When a relay overfeed timer is used and it
has “timed out,” the respective relay annunciator continu­ously blinks until the overfeed condition is resolved.

• MENU screens to move within the three main branches of
the analyzer menu tree, enabling access to edit/selection
screens. (EXIT screens indicate the end of a menu
branch and enable you, by pressing the ENTER key, to
move up one level in the menu tree. This is functionally
the same as pressing the ESC key.)

ØØ and

×× keys changes the dis-

1.2 Keypad

Accu4™ Low-range Turbidimeter System Rev. 2-300

• Edit/Selection screens to enter values/choices to cali-
brate, configure, and test the analyzer.

The keypad enables you to move throughout the analyzer
menu tree. The keys and their related functions are:

1. MENU key: Pressing this key always displays the top of

the menu tree (“MAIN MENU” selection screen). To
display the top-level menu screen for a desired main
branch (CALIBRATE, CONFIGURE, or TEST/MAINT),
use

ØØ and

×× keys to select the corresponding line, and

32

PART THREE - OPERATION SECTION 1 - USER INTERFACE

press

ENTER key

. The

MENU key

can also be used to

“abort” the procedure to change values or selections.

ENTER key:

2.

Pressing this key displays an available
menu or edit/selection screen, or enters (saves) values
or selections.

ESC key:

3.

Pressing this key always takes the display up
one level in the menu tree. (Example: With the “MAIN
MENU” branch selection screen displayed, pressing the

ESC key

once takes the display up one level to the
MEASURE screen.) This key can also “abort” the pro­cedure to change a value or selection.

4.

and

Õ

Õ

keys:

Ö

Ö

Depending on the type of displayed

screen, these keys do the following:

•

MEASURE Screen: These keys are non-functional.

•

Menu Screens: These keys are non-functional.

•

Edit/Selection Screens: “Coarse” adjusts the

displayed numerical value.

5.

and

×

×

keys:

Ø

Ø

Depending on the type of displayed

screen, these keys do the following:

•

MEASURE Screen: Changes the bottom auxiliary

display line, shown in reverse video, between Output
1 mA value and Output 2 mA value.

•

Menu Screens: Moves reverse video cursor up or

down respectively to select a displayed line item.

•

Edit/Selection Screens: “Fine” adjusts the displayed

numerical value (holding key down changes value
faster), or moves up or down between choices.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

FIGURE 3-1 Analyzer Keypad

33

PART THREE - OPERATION SECTION 1 - USER INTERFACE

1.3 MEASURE Screen
(normal display mode)

The MEASURE screen is normally displayed. Pressing the

MENU key

screens to calibrate, configure, or test the analyzer. If the
keypad is not used within 30 minutes, except during cali­bration and while using specific analyzer test/maintenance
functions, the display automatically returns to the MEAS­URE screen. To display the MEASURE screen at any time,
press the

When viewing the MEASURE screen, you can press the

or

keys

×

×

the bottom auxiliary display line. These MEASURE screen
examples illustrate this feature:

temporarily replaces this screen with various

MENU key

to select between other measurements shown on

once and then the

ESC key

once.

Ø

Ø

☞

NOTE: When the analyzer returns to its normal MEASURE

screen mode, the appearing MEASURE screen is
always the version last selected. Note that these
MEASURE screen examples show “BASIN 1” nota-
tions on their top lines, illustrating the analyzer
notation feature. To create your own notation, refer
to Part Three, Section 4.2, under the subheading
“ENTER NOTE (top line of MEASURE screen).”

When a measured value is beyond the analyzer measuring
range, a series of “ + ” or “ - ” screen symbols appear, re­spectively indicating that the value is above or below range.

Accu4™ Low-range Turbidimeter System Rev. 2-300

34

PART THREE - OPERATION SECTION 2 - MENU STRUCTURE

ECTION

S

MENU STRUCTURE

The analyzer menu tree is divided into three main branches:
CALIBRATE, CONFIGURE, and TEST/MAINT. Each main
branch is structured similarly in layers with top-level menu
screens, related lower-level submenu screens and, in many
cases, sub-submenu screens.

Each layer contains an EXIT line or screen to return the
display up one level to the previous layer of screens. For
convenience, the layers within each main branch are or­ganized with the most frequently used functions at their
beginning, rather than the functions used for initial startup.

2

2.1 Displaying
Main Branch
Selection Screen

2.2 Displaying
Top-level
Menu Screens

Press the
selection screen:

1. After displaying the main branch selection screen, use
the
the desired branch (shown in reverse video).

2. Press the ENTER key to display the top-level menu
screen for that branch.

The top-level menu screens for each main branch are:

MENU key

ØØ and

to always display this main branch

&21),*85(
7(670$,17
(;,7

×× keys to select the line corresponding to

☞

Rev. 2-300 Accu4™ Low-range Turbidimeter System

Menu Structure Tip! The symbol pointing at each listed
item indicates there is a related lower-level submenu
screen, sub-submenu screen or edit/selection screen.

Some menu lists are too long to completely fit on the
screen. A

ÈÈ symbol at the bottom right of the list indicates

35

PART THREE - OPERATION SECTION 2 - MENU STRUCTURE

2.3 Displaying
Submenu Screens

☞

or

Ø

Ø

Ø

Ø

that you can display hidden items by pressing the

key

. As you display these items a ↕ symbol appears, in­dicating that items now hidden above and below the list
can be displayed by respectively pressing the

key

. When a
reached the end of the menu list. You can move back up
the list using the

ÇÇ symbol appears, it indicates you have

×× key.

×

×

NOTE: The symbol pointing at a listed menu item indi-

cates that this item is not relevant to, nor required
for, the previously entered setup choices and,
therefore, is not available.

1. After displaying the top-level menu screen, use the

ØØ and

desired lower-level submenu screen.

2. Press the ENTER key to display the submenu screen.

×× keys to select the line corresponding to the

2.4 Adjusting
Edit/Selection
Screen Values

When a submenu or sub-submenu screen contains a first
line ending with a “?,” it is an edit/selection screen. Pressing
the

ØØ or

×× key changes the value/choice enclosed by pa-

renthesis (second line on screen).

Example: With this submenu edit screen displayed:

pressing the

Edit/selection screens always contain a second line en­closed by parenthesis -- see examples shown above and
below. The enclosed value/choice can be edited/changed
by using the
saves the change.

×× and

ØØ key displays this related choice:

ØØ keys. Pressing the ENTER key

Accu4™ Low-range Turbidimeter System Rev. 2-300

Use the
The

×× and

ÕÕ and

ÖÖ keys to “coarse” adjust numerical values.

ØØ keys “fine” adjust numerical values up or

36

PART THREE - OPERATION SECTION 3 - ADJUSTING DISPLAY CONTRAST

down respectively. The longer the key is pressed, the faster
the number changes.

2.5 Entering (Storing)
Edit/Selection Screen
Values/Choices

After the desired value/choice is displayed, press the

ENTER key

memory. The previous screen will then re-appear.

NOTE: You can always press the ESC key to abort saving

☞

S

ADJUSTING DISPLAY CONTRAST

Ambient lighting conditions may make it necessary to adjust
the analyzer display contrast to improve visibility. With the
MEASURE screen displayed, press and hold the

key

and simultaneously press the

the desired contrast.

to enter (store) it into the non-volatile analyzer

a new setting. The original setting will be retained.

ECTION

3

×

×

or

Ø

Ø

key

until attaining

ENTER

Rev. 2-300 Accu4™ Low-range Turbidimeter System

37

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

ECTION

S

CONFIGURING THE ANALYZER

4

☞

4.1 Selecting LANGUAGE
to Operate Analyzer

NOTE: When the passcode feature is enabled (Section

4.5), you must successfully enter the passcode
before attempting to enter a configuration setting.

The analyzer can display screens in various languages in­cluding English, French (Français), German (Deutsche),
Spanish (Español), and others. The analyzer is factory-set
for English. To change languages:

&21),*85(
7(670$,17
(;,7

1. Press
key to select the “CONFIGURE” line.

2. Press ENTER key to display . Use
ØØ key to select the “LANGUAGE” line.

MENU key

to display

. Use

Ø

Ø

4.2 Configuring
Sensor Characteristics

SELECT UNITS

☞

3. Press ENTER key to display a screen like

. Use

guage choices.

4. With the desired language displayed, press ENTER

key to enter this selection.

NOTE: After a language is selected and entered, all

screens will be displayed in that language.

You may want to configure the analyzer to define related
sensor characteristics such as units of measure, input sig­nal filtering, pulse suppression, and a MEASURE screen
top line notation to specifically tailor the instrument to your
application.

The Accu4™ Low-range Turbidimeter System is factory
set to display turbidity in NTUs. However, you may want

to select different measurement units:

ØØ and

×× keys to view the lan-

Accu4™ Low-range Turbidimeter System Rev. 2-300

38

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

key

1. With the screen displayed, use

Ø

Ø

to select the “SENSOR” line.

SET FILTER Time

2. Press

3. With the “SELECT UNITS” line selected, press

key
and

4. With the desired choice displayed value, press

key

ENTER key

to display .

ENTER

to display a screen like . Use

keys

×

×

•

NTU (Nephelometric Turbidity Units)

•

FTU (Formazin Turbidity Units

•

FNU (Formazin Nephelometric Units)

•

TEF (TruebungsEinhelt Formazin -- a German unit)

to view all choices which are all equivalent:

ENTER

to enter this selection.

Ø

Ø

A time constant (in seconds) can be set to filter or “smooth
out” the sensor signal. A minimum value of “0 seconds” has
no smoothing effect. A maximum value of “60 seconds” pro­vides maximum smoothing. Deciding what sensor signal
filter time to use is a compromise. The higher the filter time,
the longer the sensor signal response time will be to a
change in the actual turbidity value.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

key

1. With the screen displayed, use

Ø

Ø

to select the “SET FILTER” line.

2. Press

ENTER key

to display a screen like

.

3. Adjust the displayed value to the desired filter time, and
press

keys

ENTER key

for coarse adjust;

39

to enter the value. (Use

and

×

×

keys

Ø

Ø

for fine adjust.)

and

Ö

Ö

Õ

Õ

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

Select

PULSE SUPPRESS

(on/off)

Sometimes an external interference may occasionally cause
the measurement system to provide unstable readings.
Common causes include entrained gas bubbles in the sam­ple, and electromagnetic interference (EMI or “electrical
noise” pulses). The analyzer has a pulse suppression fea­ture to counteract this condition and stabilize readings.
Example: Suppose the analyzer reading is steadily showing

0.284 NTU, then suddenly jumps to 0.396 NTU for a few

seconds, and returns to 0.284 NTU. By turning on this fea­ture, the analyzer will perceive this as a temporary upset,
“suppressing” most of this pulse change and providing a
smoother measurement reading.

key

1. With the screen displayed, use

Ø

Ø

to select the “PULSE SUPPRESS” line.

2. Press

ENTER key

. Use

to display a screen like

and

Ø

Ø

keys

×

×

to view both

choices (OFF or ON).

ENTER NOTE (top line

of MEASURE screen)

3. With the desired choice displayed, press

ENTER key

to

enter this selection.

The MEASURE screen top line is factory set to read “ACCU4.”
This notation can be changed, for example, to “BASIN 1” to
tailor the MEASURE screen to the application. The notation is
limited to eight characters which can be a combination of
capital letters A through Z, numbers 0 through 9, and spaces.

key

1. With the screen displayed, use

Ø

Ø

to select the “ENTER NOTE” line.

2. Press

ENTER key

to display . Create

the desired notation within second line’s parenthesis:

A. Starting with extreme left character position, use

and

keys

Ø

Ø

to select the desired first character.

×

×

Accu4™ Low-range Turbidimeter System Rev. 2-300

key

B. Press

use

Ö

and

×

×

Ö

once to select the next character, and

keys

Ø

Ø

to select desired character.

C. Repeat procedure until desired notation is displayed.

3. Press

ENTER key

40

to enter the displayed notation.

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

4.3 Configuring Analog
Outputs (1 and 2)

☞

The analyzer provides two isolated analog outputs (1 and

2), each representing the measured turbidity. During cali­bration, both analog outputs can be held at their present
values, transferred to a preset value, or remain active. Dur­ing normal measurement operation, both outputs can be:

•

Held for up to 30 minutes by using the “CHECK CAL/

HOLD” function in the TEST/MAINT menu.

•

Held indefinitely by locally or remotely connecting both

TTL input terminals on TB1.

If a TEST/MAINT hold is applied in addition to a TTL hold,
both “holds” must be removed before the outputs return to
active status. If the outputs are set to “XFER” or “ACTIVE”
during a calibration, they remain in that state until after cali­bration regardless of the TTL input status.

NOTE: When using the HART communication option, a

digital signal is encoded onto the 4-20 mA analog
Output 1 signal. In a HART SINGLE MODE wiring
configuration, Output 1 remains available for normal
use. However, in a HART MULTI-DROP wiring con­figuration, Output 1 becomes dedicated to that
function and cannot be used. See Part Three, Sec­tion 8 for more HART communication information.

SET 0/4 and

20 mA VALUES

These instructions configure Output 1. Configure Out­put 2 in the same way using its respective menu
screens.

You can set the turbidity values to define the endpoints at
which the minimum and maximum output values are desired.

1. With the top-level menu screen dis­played and the “SET OUTPUT 1” line selected, press

ENTER key

to display

.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

41

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

2. With the “SET 4 mA VALUE” line selected, press

☞

ENTER key

3. Set the displayed value at which 0/4 mA is desired, and
press

keys

for coarse adjust;

4. After the screen re-appears, use
to select the “SET 20 mA VALUE” line.

5. Press

6. Set the displayed value at which 20 mA is desired, and
press

ENTER key

to display a screen like .

ENTER key

ENTER key

to enter the value. (Use

and

×

×

to display a screen like

.

to enter the value.

keys

Ø

Ø

for fine adjust.)

and

Ö

Ö

Ø

Ø

Õ

Õ

key

NOTE: If the same values are set for 0/4 mA and 20 mA, the

output automatically goes to, and remains at, 20 mA.

SET TRANSFER

Value (mA)

Normally, each analog output is active, responding to the
measured turbidity value. During calibration, however, you
can transfer (XFER) each output to a preset value to oper­ate a control element by an amount corresponding to that
value.

If you desire to set a milliamp transfer value for an analog
output to suit your application, follow these steps:

key

1. With the screen displayed, use
to select the “SET TRANSFER” line.

2. Press

3. Set the displayed value to the desired transfer value,
and press
for coarse adjust;

ENTER key

.

ENTER key

and

×

×

to display a screen like

and

to enter it. (Use

keys

Ø

Ø

for fine adjust.)

Ö

Ö

Ø

Ø

keys

Õ

Õ

Accu4™ Low-range Turbidimeter System Rev. 2-300

42

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

SET FILTER Time

☞

A time constant (in seconds) can be set to filter or “smooth
out” the output signal. A minimum value of “0 seconds” has
no smoothing effect. A maximum value of “60 seconds” pro­vides maximum smoothing. Deciding what output filter time
to use is a compromise. The higher the filter time, the longer
the output signal response time will be to a change in the
measured turbidity.

NOTE: The output filter time setting combines with the sen-

sor signal filter time setting, providing an additive
delay in output response to the actual reading.

key

1. With the screen displayed, use
to select the “SET FILTER” line.

2. Press

ENTER key

.

to display a screen like

Ø

Ø

Select SCALE 0 mA/

4 mA (low endpoint)

3. Adjust the displayed value to the desired filter time, and
press
coarse adjust;

Select each output to be 0-20 mA or 4-20 mA.

1. With the screen displayed, use
to select the “SCALE 0mA/4mA” line.

2. Press

Ø

Ø

3. With the desired choice displayed, press
enter this selection.

ENTER key

ENTER key

and

×

×

to enter it. (Use

and

×

×

keys

to view both choices (0 mA or 4 mA).

keys

Ø

Ø

to display . Use

for fine adjust.)

and

Ö

Ö

ENTER key

keys

Õ

Õ

Ø

Ø

for

key

to

Rev. 2-300 Accu4™ Low-range Turbidimeter System

43

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

4.4 Configuring Relays
(A, B, C, and D)

The analyzer is equipped with four electromechanical relays
(A, B, C, and D). Each relay can be set to function as a
CONTROL, ALARM, or STATUS relay. For details on each
relay function, see subsection “SET FUNCTION Mode.”

During calibration, CONTROL and ALARM (not STATUS)
relays can be held at their present on/off states, transferred
to preset on/off states, or remain active. During normal
measurement operation, CONTROL and ALARM relays can
be:

•

Held at their present on/off states for up to 30 minutes

by using the “CHECK CAL/HOLD” function in the TEST/
MAINT menu.

•

Held at their present on/off states indefinitely by locally

or remotely connecting both TTL input terminals on
TB1.

If a TEST/MAINT hold is applied in addition to a TTL hold,
both “holds” must be removed before CONTROL and
ALARM relays return to active status. If the relays are set to
“XFER” or “ACTIVE” during a calibration, they remain in that
state until after calibration regardless of the TTL input
status.

SET FUNCTION Mode

(alarm, control, or status)

These instructions configure Relay A. Configure other
relays in the same way using their respective menu
screens.

Each relay can be selected to function as a:

ALARM

•

relay (with separate high and low alarm points
and deadbands) that operates in response to the
measured turbidity.

CONTROL

•

relay (with phasing, setpoint, deadband,
and overfeed timer) that operates in response to the
measured turbidity.

STATUS

•

relay that operates only in response to
selected system diagnostic conditions. It can be
configured for:

FAIL mode -- sets STATUS relay to activate when
there is a FAIL condition (analyzer, light source or
detector) or a sensor CHAMBER UNKNOWN
condition.

Accu4™ Low-range Turbidimeter System Rev. 2-300

44

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

WARN mode -- sets STATUS relay to activate only when
there is a sensor flow CHAMBER DIRTY condition.

ALL mode -- sets STATUS relay to activate when
there is any abnormal system condition (any FAIL
condition, or sensor CHAMBER DIRTY or
UNKNOWN condition).

A “WARNING CHECK STATUS” message automatically
flashes on the MEASURE screen whenever the analyzer
detects any of these system diagnostic conditions:

•

ANALYZER FAIL

•

CHAMBER DIRTY

•

CHAMBER UNKNOWN• DETECT 2 FAIL

•

SOURCE 1 FAIL

•

SOURCE 2 FAIL

•

DETECT 1 FAIL

To determine the condition causing the warning message,
display the “STATUS” screens in the TEST/MAINT menu
branch. For more details, see Part Three, Section 6.1.

Relay D is factory-set to function as a STATUS relay but
can be configured as a CONTROL or ALARM relay.

1. With the screen displayed, press

key

once to display .

ESC

Rev. 2-300 Accu4™ Low-range Turbidimeter System

key

2. Use

Ø

Ø

ENTER key

to select the “SET RELAY A” line, and press

to display .

3. With the “SET FUNCTION” line selected, press

key

to display a screen like

and

keys

×

×

to view the choices (ALARM, CONTROL or

. Use

STATUS).

4. With the desired choice displayed, press

ENTER key

enter this selection.

45

ENTER

Ø

Ø

to

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

SET TRANSFER Mode

(relay on or off)

Normally, each CONTROL or ALARM relay is ACTIVE, re­sponding to the measured turbidity. During calibration,
however, you can transfer (XFER) each relay to a preset
on/off state.

If you desire to set a relay on/off transfer state for a
CONTROL or ALARM relay to suit your application, follow
these steps:

key

1. With the screen displayed, use

Ø

Ø

to select the “SET TRANSFER” line.

2. Press

ENTER key

. Use

to display a screen like

and

Ø

Ø

keys

×

×

to view both

choices (DE-ENERGIZED or ENERGIZED).

3. With the desired choice displayed, press

ENTER key

to

enter this selection.

SET ACTIVATION

(configuration values)

The group of configuration settings available to a relay is
dependent on its selected function mode. Table A describes
relay configuration settings, categorized by function mode:

Table A -- RELAY CONFIGURATION SETTINGS

Setting Description

For ALARM Relay

Low Alarm Sets the value at which the relay will turn on in

response to decreasing measured value.

High Alarm Sets the value at which the relay will turn on in

response to increasing measured value.

Low
Deadband

High
Deadband

Off Delay Sets a time (0-300 seconds) to delay the relay from

On Delay Sets a time (0-300 seconds) to delay the relay from

Phase A “high” phase assigns the relay setpoint to respond

Setpoint Sets the value at which the relay will turn on.

Sets the range in which the relay remains on after the
measured value increases above

Sets the range in which the relay remains on after the
measured value decreases below

normally turning off.

normally turning on.

For CONTROL Relay

to increasing measured value; conversely, a “low”
phase assigns the relay setpoint to respond to de­creasing measured value.

the low alarm value.

the high alarm value.

Accu4™ Low-range Turbidimeter System Rev. 2-300

46

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

Table A -- RELAY CONFIGURATION SETTINGS -- continued

Setting Description

For CONTROL Relay (continued)

Deadband Sets the range in which the relay remains on after the

measured value decreases below the setpoint value
(high phase relay) or increases above the setpoint
value (low phase relay).

Overfeed
Timer

Off Delay Sets a time (0-300 seconds) to delay the relay from

On Delay Sets a time (0-300 seconds) to delay the relay from

Fail Sets the relay to turn on only when there is a FAIL

Warn Sets the relay to turn on only when there is a sensor

All Sets the relay to turn on when there is any abnormal

Sets the time (0-999.9 min.) to limit how long the re­lay can remain “on.” For more details on overfeed
timer operation, see Part Three, Section 7.

normally turning off.

normally turning on.

For STATUS Relay

condition (analyzer, light source or detector) or a
sensor CHAMBER UNKNOWN condition.

flow CHAMBER DIRTY condition.

system condition (any FAIL condition, or sensor flow
CHAMBER DIRTY or UNKNOWN condition).

☞

NOTE: Also, it is possible to enter values that always keep

a relay active or inactive. To avoid this, be sure that
“low” values are lower than “high” values.

The “off delay” and “on delay” settings, available to
CONTROL or ALARM relays, may be beneficial in eliminat­ing process “overshoot” when there are long process pipe
runs or delays in mixing.

Suppose Relay A is an ALARM. To set configuration values:

key

1. With the screen displayed, use

Ø

Ø

to select the “ACTIVATION” line.

2. Press

ENTER key

to display

.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

key

3. Use

Ø

Ø

to select the appropriate relay setting line,
and press
edit/selection screen.

47

ENTER key

to display its corresponding

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

4. Use the same basic keypad operations described in
previous setup procedures to enter the desired value
for the displayed relay activation setting.

5. Repeat this procedure for each relay activation setting.

4.5 SET PASSCODE
(feature enabled/
disabled)

The analyzer has a passcode feature to restrict access to
configuration and calibration settings to only authorized
personnel.

DISABLED:

•

With passcode disabled, all configuration
settings can be displayed and changed, and the analyzer
can be calibrated.

ENABLED:

•

With passcode enabled, all configuration set­tings can be displayed -- but they cannot be changed, and
the analyzer cannot be calibrated. When you attempt to
change a setting by pressing the

ENTER key

, a displayed
notification requests passcode entry. A valid passcode
entry saves the changed setting and returns the display to
the “MAIN MENU” branch selection screen. An incorrect
passcode entry causes the display to momentarily show
an error notification and return to the “MAIN MENU”
branch selection screen. There is no limit on attempts to
enter a valid passcode.

The passcode is factory-set to “

3456

.” It cannot be changed.

To enable or disable the passcode feature:

1. With the top-level menu screen dis-

key

played, use

2. Press

and

Ø

Ø

Ø

Ø

ENTER key

keys

×

×

to view both choices (DISABLED or

to select the “SET PASSCODE” line.

to display . Use

ENABLED).

3. With the desired choice displayed, press

ENTER key

to

enter this selection.

Accu4™ Low-range Turbidimeter System Rev. 2-300

48

PART THREE - OPERATION SECTION 4 - CONFIGURING THE ANALYZER

4.6 Configuration Setting
Summary

Table B -- ANALYZER CONFIGURATION SETTINGS (RANGES/CHOICES and DEFAULTS)

Displayed Screen Title Entry Range or Choices (where applicable) Factory Default Your Setting

LANGU AGE? ENGLISH, FRENCH, GERMAN, SPANISH, etc. ENG L ISH

SET FILTER? 0-60 seconds 30 seconds

PULSE SUPPRESS? OFF or ON OFF

ENTER NOTE? Enter up to eight characters to replace ACCU4 ACCU4

SET 4mA VALUE? 0.000-100.0 NTU 0.000 NTU

SET 20mA VALUE? 0.000-100.0 NTU 100.0 NTU

SET TRANSFER? 0-20 mA or 4-20 mA Outputs 1 and 2: 12 mA

SET FILTER? 0-60 seconds Outputs 1 and 2: 0 seconds

SCALE 0mA/4mA? 0 mA or 4 mA Outputs 1 and 2: 4 mA

Settings Common To ALARM and CONTROL Relays:

SET FUNCTION? ALARM, CONTROL, or STATUS Relays A and B: ALARM

SET TRANSFER? DE-ENERGIZED or ENERGIZED Relays A and B: DE-ENERGIZED

OFF DELAY? 0-300 seconds 0 seconds

ON DELAY? 0-300 seconds 0 seconds

Settings For ALARM Relays Only:

LOW ALARM? 0.000-100.0 NTU 0.000 NTU

HIGH ALARM? 0.000-100.0 NTU 100.0 NTU

LOW DEADBAND? 0-10% of meas. range in which setpoint resides 0.000 NTU

HIGH DEADBAND? 0-10% of meas. range in which setpoint resides 0.000 NTU

Settings For CONTROL Relays Only:

PHASE? HIGH or LOW Relays A and B: HIGH

SET SETPOINT? 0.000-100.0 NTU 100.0 NTU

DEADBAND? 0-10% of meas. range in which setpoint resides 0.000 NTU

OVERFEED TIMER? 0-999.9 minutes 0 minutes

Setting For STATUS Relays Only:

ACTIVATION? FAIL, WARN or ALL STATUS Relays A and B: ALL

SET PASSCODE? DISABLED or ENABLED DISABLED

TEST/MAINTENANCE Simulation Function Setting

SIM SENSOR? 0.000-100.0 NTU Present measured turbidity value

Table B lists all configuration settings and their entry ranges/
choices and factory defaults, categorized by basic functions.

LANGUAGE Configuration Setting

SENSOR Configuration Settings

Analog OUTPUT Configuration Settings

RELAY Configuration Settings

Relay C: STATUS -- WARN
Relay D: STATUS -- FAIL

STATUS Relay C: W ARN
STATUS Relay D: FAIL

PASSCODE Configuration Setting

Rev. 2-300 Accu4™ Low-range Turbidimeter System

49

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

ECTION

S

CALIBRATING THE ANALYZER

5

5.1 Things to Know
About Calibration

☞

The Accu4™ Low-range Turbidimeter System can be cali­brated using one of three methods:

•

PRIMARY CAL: Requires entering a primary standard

value of a formazin suspension.

•

CUBE CAL: Requires inserting an optional Cal-Cube

assembly into the sensor flow chamber and entering its
factory-certified standard value.

•

SAMPLE CAL: Requires entering a sample value deter-

mined by laboratory analysis or calibrated portable
meter.

You can conveniently verify system calibration at any
time, regardless of the method used, with the optional
GLI Cal-Cube™ assembly. Refer to Part Three, Section

6.2 for complete details.

NOTE: The sensor is equipped with long-lasting light

sources and detectors. If these components are
eventually replaced, always re-calibrate the system
using the appropriate method to ensure measure­ment accuracy. Also, re-calibrate if the cable length
between sensor and analyzer changes.

TM

☞

The mA value for each analog output can also be calibrated
(Section 5.5).

NOTE: When the passcode feature is enabled (Section

4.5), you must successfully enter the passcode
before attempting to calibrate the analyzer.

An in-progress calibration can always be aborted by
pressing the ESC key. After the “ABORT: YES?”
screen appears, do one of the following:

•

Press ENTER key to abort. After the “CONFIRM
ACTIVE?” screen appears, press ENTER key to
return the analog outputs and relays to their ac­tive states (MEASURE screen appears).

•

Press
screen, and press ENTER key to continue cali­bration.

×

×

or

Ø

key to choose the “ABORT: NO?”

Ø

Accu4™ Low-range Turbidimeter System Rev. 2-300

50

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

☞

5.2 PRIMARY CAL Method
(requires formazin
suspension)

Calibration Tip!

“CONFIRM FAILURE?” screen appears, press

key

to confirm. Then, use

If at any time during calibration, the

ENTER

or

Ø

Ø

key

to select between

×

×

“CAL REPEAT?” or “CAL EXIT?” and do one of the fol­lowing:

•

With the “CAL REPEAT?” screen selected, press

ENTER key

•

With the “CAL EXIT?” screen selected, press

key

. After the “CONFIRM ACTIVE?” screen appears,

press

to repeat calibration.

ENTER key

to return the analog outputs and

ENTER

relays to their active states (MEASURE screen ap­pears).

This calibration method requires you to first fill the sensor
flow chamber with a primary standard (formazin suspen­sion) and then enter its known value. Since formazin is the
recommended primary standard, it is used in the instruc­tions for this method.

Preparing

Formazin Solution

Prepare 2000 milliliters of

20 NTU or higher

formazin sus­pension (USEPA requires 40 NTU to comply with GLI
Method 2) using the following laboratory procedure:

1. Make the dilution water:

To obtain high-purity, low turbidity water for dilutions,
pass distilled water through a 0.2 micron filter. Rinse
the flask at least twice with filtered water before col­lecting the dilution water.

2. Make the stock turbidity suspension:

WARNING:

HYDRAZINE SULFATE IS A KNOWN
CARCINOGEN. TAKE PRECAUTIONS TO AVOID
INHALATION, INGESTION, AND SKIN CONTACT.

SOLUTION 1:

A.

grade hydrazine sulfate, (NH

Dissolve 5.00 grams of reagent-

2)2H2SO4

, in distilled

water and dilute to 500 ml in a volumetric flask.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

51

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

SOLUTION 2:

B.

Dissolve 50.00 grams of reagent-grade
hexamethylenetetramine, (CH2)6N4, in distilled water
and dilute to 500 ml in a volumetric flask.

C. In a flask, mix 50.0 ml of SOLUTION 1 and 50.0 ml

of SOLUTION 2. Let this mixture stabilize for 24
hours at 25°C, ± 3°C. The resultant mixture is a
4000 NTU stock turbidity suspension. Transfer the
stock suspension to an amber glass (or other UV­light blocking) bottle for storage. Make dilutions
from this stock suspension. When properly stored,
this stock suspension should remain stable for up
to one year.

3. Make the standard formazin suspension for calibration:

20 NTU Standard Suspension:

•

Use filtered dilu­tion water to dilute 10 ml of 4000 NTU stock
suspension to 2000 ml.

☞

Filling Sensor

40 NTU Standard Suspension:

•

Use filtered dilu­tion water to dilute 20 ml of 4000 NTU stock
suspension to 2000 ml.

Calibration Tip!

Use only freshly prepared, properly
stored, and carefully measured formazin suspension.
Formazin tends to flocculate over time, causing inaccu­rate readings. Formazin suspensions must be equally
distributed within the flask. Gently swirl the flask several
times. Do not vigorously shake the flask which could in­troduce air bubbles that may falsely increase readings.

Recommendation:

1.

Before filling the sensor with a for­mazin suspension (primary standard), hold the analyzer
analog outputs at their present values or transfer them
to preset values to ensure a safe condition for any con­nected devices.

Accu4™ Low-range Turbidimeter System Rev. 2-300

&21),*85(
7(670$,17
(;,7

A. Press

MENU key

to display

.

B. With the “CALIBRATE” line selected (reverse video),

press ENTER key to display .

52

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

C. With the “SENSOR” line selected, press

key

to display .

D. With the “PRIMARY CAL” line selected, press

ENTER key

key

Ø

Ø

puts (and relays) can be in during calibration:

•

•

•

E. With the desired choice displayed, press

key

2. Turn the sensor’s 3-way valve handle to the

CALIBRATE

of the flow chamber (

to view the three states that the analog out-

HOLD OUTPUTS:
XFER OUTPUTS:
ACTIVE OUTPUTS:

to enter this selection.

to display . Use

Holds their present values.

Transfers to preset values.

Responds to measured turbidity.

position as shown by the label at the base

Õ

points towards funnel hose).

Õ

ENTER

or

×

×

ENTER

☞

3. If the recommended isolation valve is used downstream
of the sensor OUTLET, open the valve to atmospheric
pressure to improve draining.

4. Drain any remaining process from the sensor by removing
the funnel from its holder and lowering it below the sensor
height. When drained, replace funnel into holder.

5. Remove the baffle assembly from the flow chamber and
rinse it with clean water.

6. Clean the inside of the flow chamber and the light source
and detector windows with a soft, clean, damp cloth.

7. Re-install the baffle assembly into the flow chamber,
and replace and tighten the flow chamber cover.

NOTE: The following steps 8, 9, and 10 ensure that only

pure, primary standard formazin suspension is be­ing measured in the sensor flow chamber.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

8. Rinse the sensor’s internal tubing with the primary
standard formazin suspension by pouring it into the
funnel until the suspension can be seen in the clear
SIGHT TUBE. Now drain this rinse suspension in the
same way as described in step 4.

53

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

9. Rinse sensor tubing a second time with another volume
of primary standard formazin suspension and drain
again (a repeat of step 5).

10. Fill sensor tubing a third time with another volume of
primary standard formazin suspension until it can be
seen in the clear SIGHT TUBE.

Entering Value

After the sensor is properly filled, enter the exact known
value of the suspension.

1. With the screen displayed and the sen­sor filled with primary standard formazin suspension,

press

ENTER key

to confirm. This active

screen appears showing the measurement reading.

2. Wait for the reading to stabilize which may take up to
15 minutes. Then press

ENTER key

. The “PLEASE
WAIT” screen may appear if the reading is still too un-
stable. After the reading has stabilized, this static

screen appears showing the “last-

entered” calibration value.

3. Use

and

×

×

keys

Ø

Ø

to adjust this displayed value to
exactly match the known NTU value of the primary
standard formazin suspension.

Resuming Operation

Accu4™ Low-range Turbidimeter System Rev. 2-300

4. Press

ENTER key

to enter the value and complete cali­bration (“PRIMARY CAL: CONFIRM CAL OK?” screen
appears).

To resume normal measurement operation:

1. Drain the sensor flow chamber as described in the pre­vious “Filling Sensor” subsection in step 4.

2. Turn the sensor’s 3-way valve handle to the

OPERATE

position as shown by the label at the base of the flow
chamber (

Ö

points towards INLET fitting).

Ö

3. If using the recommended isolation valve downstream
of the Model 8320 sensor OUTLET fitting, make sure it
is open to allow process flow.

54

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

5.3 CUBE CAL Method
(requires optional
Cal-CubeTM assembly)

Inserting

Cal-CubeTM Assembly

4. Press

ENTER key

to display the active measurement
reading on the “CONFIRM ACTIVE?” output status
screen. When the reading corresponds to the actual
typical process value, press

ENTER key

again to return
the analog outputs and relays to their active states
(MEASURE screen appears).

This completes “PRIMARY CAL” calibration. The system is
now ready for normal measurement operation.

This calibration method requires you to first insert an
optional GLI Cal-CubeTM assembly into the sensor flow
chamber and then enter its known value. This unique turbid
glass cube has a factory-certified, 100% reproducible NTU
calibration value that is not affected by light, temperature, or
aging.

Recommendation:

1.

Before inserting the Cal-Cube

TM

assembly into the sensor, hold the analyzer analog out­puts at their present values or transfer them to preset
values to ensure a safe condition for any connected de­vices.

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A. Press

MENU key

to display

.

B. With the “CALIBRATE” line selected (shown in re-

verse video), press ENTER key to display

.

C. With the “SENSOR” line selected, press ENTER

key to display .

D. Use

ØØ key to select the “CUBE CAL” line and press

ENTER key to display . Use

×× or

ØØ key to view the three states that the analog out-

puts (and relays) can be in during calibration:

Rev. 2-300 Accu4™ Low-range Turbidimeter System

55

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

HOLD OUTPUTS:

•

XFER OUTPUTS:

•

ACTIVE OUTPUTS:

•

Holds their present mA values.

Transfers to preset mA values.

Responds to measured turbidity.

E. With the desired choice displayed, press

key

to enter this selection.

ENTER

2. Turn the sensor’s 3-way valve handle to the

CALIBRATE

of the flow chamber (

position as shown by the label at the base

Õ

points towards funnel hose).

Õ

3. If the recommended isolation valve is used downstream
of the sensor OUTLET, open the valve to atmospheric
pressure to improve draining.

4. Drain any remaining process from the sensor by re­moving the funnel from its holder and lowering it below
the sensor height. When drained, replace funnel into
holder.

5. Remove the flow chamber cover and baffle assembly
from the Model 8320 sensor flow chamber. Refer to
Figure 4-1 (standard sensor design) or Figure 4-2 (high
pressure sensor design) for assembly details.

Entering Value

6. Wipe away all moisture from inside the chamber with a
clean, dry, soft cloth.

7. Wipe the light source and detector windows clean using
a clean, dry, soft cloth.

8. Note the factory-certified value on Cal-CubeTM assem­bly, and insert the cube into the sensor in place of the
baffle assembly. Without replacing the flow chamber
cover, close the sensor enclosure door.

After the Cal-CubeTM assembly is properly inserted in the
sensor flow chamber, enter its factory-certified value.

1. With the

TM

Cube

key

assembly inserted in the sensor, press

to confirm. This active

screen displayed and the Cal-

ENTER

screen ap-

pears showing the measurement reading.

Accu4™ Low-range Turbidimeter System Rev. 2-300

56

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

2. Wait for the reading to stabilize which may take up to
15 minutes. Then press

ENTER key

. The “PLEASE
WAIT” screen may appear if the reading is still too un-
stable. After the reading has stabilized, this static

screen appears showing the “last-

entered” calibration value.

Resuming Operation

3. Use

and

×

×

keys

Ø

Ø

to adjust this displayed value to ex­actly match the factory-certified Cal-CubeTM assembly
value.

4. Press

ENTER key

to enter the value and complete cali­bration (CUBE CAL: CONFIRM CAL OK?” screen
appears).

To resume normal measurement operation:

1. Remove the Cal-CubeTM assembly, re-install the baffle
assembly, and replace the flow chamber cover. Make
sure the cover O-ring is well lubricated with the sup­plied silicone lubricant. If not, the cover may be difficult
to remove the next time.

2. Turn the sensor’s 3-way valve handle to the

OPERATE

position as shown by the label at the base of the flow
chamber (

Ö

points towards INLET fitting).

Ö

5.4 SAMPLE CAL Method
(requires sample
with value determined
by laboratory analysis
or portable meter)

Rev. 2-300 Accu4™ Low-range Turbidimeter System

3. Press

ENTER key

to display the active measurement
reading on the “CONFIRM ACTIVE?” output status
screen. When the reading corresponds to the actual
typical process value, press

ENTER key

again to return
the analog outputs and relays to their active states
(MEASURE screen appears).

This completes “CUBE CAL” calibration. The system is now
ready for normal measurement operation.

This calibration method requires you to first obtain a proc­ess sample, determine its NTU value using laboratory
analysis or a comparison reading, and then enter its known
value.

57

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

1. With the process flowing through the sensor, press

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MENU key

to display

.

2. With the “CALIBRATE” line selected (shown in reverse

video), press

ENTER key

to display .

3. With the “SENSOR” line selected, press

display .

key

4. Use

Ø

Ø

ENTER key
key

to view the three states that the analog outputs

to select the “SAMPLE CAL” line and press

to display . Use

(and relays) can be in during calibration:

HOLD OUTPUTS:

•

XFER OUTPUTS:

•

ACTIVE OUTPUTS:

•

Holds their present mA values.

Transfers to preset mA values.

Responds to measured turbidity.

5. With the desired choice displayed, press
enter this selection.

ENTER key

or

×

×

ENTER key

to

Ø

Ø

to

Accu4™ Low-range Turbidimeter System Rev. 2-300

6. With the screen displayed and the
process flowing through the sensor, press

ENTER key

to confirm. This active screen appears
showing the measurement reading.

7. Wait for the reading to stabilize which may take up to
15 minutes. Then press

ENTER key

. The “PLEASE
WAIT” screen may appear if the reading is still too un-
stable. After the reading has stabilized, this static

screen appears showing the “last-

entered” calibration value.

8. Obtain a process sample and determine its NTU value
using laboratory analysis or a calibrated portable meter.

58

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

9. With the static screen displayed, use

and

×

×

keys

Ø

Ø

to adjust the displayed value to exactly

match the known NTU value of the process sample.

5.5 Analog Outputs
(1 and 2) Calibration

☞

10. Press

ENTER key

to enter the value and complete cali­bration (“SAMPLE CAL: CONFIRM CAL OK?” screen
appears).

11. Press

ENTER key

to display the active measurement
reading on the “CONFIRM ACTIVE?” output status
screen. When the reading corresponds to the actual
typical process value, press

ENTER key

again to return
the analog outputs and relays to their active states
(MEASURE screen appears).

This completes “SAMPLE CAL” calibration.

The analyzer analog outputs are factory-calibrated. How­ever, they can be re-calibrated at any time if desired.

This
procedure calibrates Output 1. Calibrate Output 2 in the
same way using its respective menu screens.

NOTE: When the passcode feature is enabled (Section

4.5), you must successfully enter the passcode
before attempting to calibrate the analog outputs.

When an output is configured to be 0-20 mA, the
analyzer will calibrate the 4 mA and 20 mA values
(not the 0 mA value). Also, the analyzer adjustment
range for output values during calibration is ± 2 mA.

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1. Press

MENU key

to display

.

2. With the “CALIBRATE” line selected (shown in reverse

video), press

3. Use

press

key

Ø

Ø

ENTER key

ENTER key

to display .

to select the “CAL OUTPUTS” line, and

to display .

Rev. 2-300 Accu4™ Low-range Turbidimeter System

59

PART THREE - OPERATION SECTION 5 - CALIBRATING THE ANALYZER

4. With the “CAL OUTPUT 1” line selected, press

ENTER key

to display .

5. With the “CAL OUT 1 4 mA” line selected, press

ENTER key

to display a screen like .
The displayed value is “counts” -- not mA -- that
dynamically change when the output is adjusted.

6. Use a calibrated digital multimeter to measure Output
1’s actual minimum value provided at Terminals 2 and 3
on TB1.

7. Use

Ö

Ö

and

keys

Õ

Õ

(coarse adjust) and

and

×

×

keys

Ø

Ø

(fine adjust) to adjust Output 1’s minimum value to read
exactly “4.00 mA” on the digital multimeter -- not the
analyzer display.

8. Press

ENTER key

to complete calibration of the

minimum endpoint value.

key

9. After the screen re-appears, use

Ø

Ø

to select the “CAL OUT 1 20 mA” line, and press

ENTER key

to display a screen like .
Once again the displayed value is “counts” -- not mA -­that dynamically change when the output is adjusted.

10. Use a calibrated digital multimeter to measure Output
1’s actual maximum value.

11. Use

Ö

Ö

and

keys

Õ

Õ

(coarse adjust) and

and

×

×

keys

Ø

Ø

(fine adjust) to adjust Output 1’s maximum value to read
exactly “20.00 mA” on the digital multimeter -- not the
analyzer display.

12. Press

ENTER key

to complete calibration of the

maximum endpoint value.

This completes Output 1 calibration.

Accu4™ Low-range Turbidimeter System Rev. 2-300

60

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

ECTION

S

6

TEST/MAINTENANCE

The analyzer has TEST/MAINT menu screens to:

•

Check system status of analyzer, sensor, and relays.

•

Check calibration/hold analog outputs at present values.

•

Manually reset all relay overfeed timers.

•

Provide analog output test signals to confirm operation

of connected devices.

•

Test relay operation (energize or de-energize).

•

Identify turbidity sensor type.

•

Identify analyzer EPROM version.

•

Simulate a measured turbidity signal to exercise the

measurement loop.

6.1 STATUS Checking
(analyzer, sensor, and
relays)

•

Reset all configuration values to factory-set defaults.

The system diagnostic capabilities of the analyzer enable
you to check the operating status of the analyzer, sensor,
and relays. The MEASURE screen will flash the “WARNING
CHECK STATUS” message when an abnormal system di­agnostic condition has been detected. To determine the
condition causing the warning, display the “STATUS”
screens:

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1. Press

Ø

Ø

MENU key

key

to select the “TEST/MAINT” line.

to display

, and use

Rev. 2-300 Accu4™ Low-range Turbidimeter System

2. Press

3. With the “STATUS” line selected, press

ENTER key

to display

ENTER key

display the “STATUS: ANALYZER OK” screen. This

61

.

to

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

screen confirms that the analyzer is operating properly.
If “FAIL” appears, it may mean:

•

EPROM failure (data is not valid).

•

Scaling card not present or not recognized.

•

Analog-to-digital converter not responding.

•

RAM failure.

•

Internal serial communications failure.

4. Press

ENTER key

once to view the “STATUS:

SENSOR” screen. Sensor status indications can be:

•

CHAMBER OK -- Sensor is operating properly.

•

CHAMBER DIRTY -- Sensor flow chamber needs

cleaning. Refer to Part Four, Section 1.1 for details.

•

CHAMBER UNKNOWN -- Sensor may be:

✓

Disconnected or incorrectly wired to analyzer.

✓

Providing a very noisy measurement signal.

✓

Inoperative due to disconnected or incorrectly

wired light source or detector.

✓

Inoperative due to bad signal processing module.

5. With the “STATUS: SENSOR” screen displayed, press

ENTER key

screen. Press

once to view the “STATUS: SOURCE 1”

ENTER key

again to view the “STATUS:

SOURCE 2” screen. Source status indications can be:

•

OK -- LED light source is operating properly.

Accu4™ Low-range Turbidimeter System Rev. 2-300

•

FAIL -- LED light source may be disconnected, in-

correctly wired, or inoperative. See Part Four,
Section 1.3 for replacement details.

6. With the “STATUS: SOURCE 2” screen displayed,
press
screen. Press

ENTER key

ENTER key

once to view “STATUS: DETECT 1”

again to view the “STATUS:

DETECT 2” screen. Detector status indications can be:

•

OK -- Detector is operating properly.

•

FAIL -- Detector may be disconnected, incorrectly

wired, or inoperative. See Part Four, Section 1.3 for
replacement details.

7. With the “STATUS: DETECT 2” screen displayed, press

ENTER key

Subsequent

once to view the “STATUS: RLY A” screen.

ENTER key

presses display status screens

for Relay B, C, and D. Relay status indications can be:

62

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

Status Indication Meaning

Control Relay: Measured value exceeds setpoint.

ACTIVE

(Relay energized;

annunciator is on)

INACTIVE

(Relay not energized;

annunciator is off)

TIMEOUT

(Relay not energized;

annunciator blinks)

COUNTING

(Relay energized;

annunciator is on)

Alarm Relay: Measured value exceeds low or

high alarm point.

Status Relay: Selected system diagnostic

condition has been detected.

Control Relay: Measured value does not exceed

setpoint.

Alarm Relay: Measured value does not exceed

low or high alarm point.

Status Relay: Analyzer has not detected selected

system diagnostic condition.

Control Relay: Overfeed timer has timed out;

manually reset it.

NOTE:

Control Relay: Overfeed timer is counting, but

NOTE:

TIMEOUT only applies to control relays.

has not timed out.

COUNTING only applies to control relays.

6.2 CHECK CAL/HOLD
Outputs

8. To end status checking, press

ESC

ENTER key

or

.

The Accu4™ system has a convenient feature to easily check
calibration at any time, and to hold the analog outputs (1 and

2) at their present values, suspending operation of any con­nected devices. The calibration check, however, requires an
optional Cal-Cube™ assembly.

key

1. With the screen displayed, use

Ø

Ø

to select the “CHECK CAL/HOLD” line.

2. Press

ENTER key

to immediately hold the analog
outputs (“OUTPUTS ON HOLD” screen appears, ac­knowledging that hold has occurred while showing the
active measurement reading).

☞

Rev. 2-300 Accu4™ Low-range Turbidimeter System

NOTE:

If the keypad is not used within 30 minutes, the
analog outputs will automatically change back
to their active states and the display will return
to the MEASURE screen.

63

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

3. Temporarily insert the Cal-Cube™ assembly:

A. Turn sensor’s 3-way valve handle to the

CALIBRATE

position as shown by the label at the base of the flow
chamber (

Õ

points towards funnel hose).

Õ

B. If the recommended isolation valve is used down-

stream of the sensor OUTLET, open the valve to
atmospheric pressure to improve draining.

C. Drain any remaining process from sensor by re-

moving funnel from its holder and lowering it below
the sensor height. When drained, replace funnel
into holder.

D. Remove the flow chamber cover and baffle assem-

bly from the sensor flow chamber. Refer to Figure
4-1 (standard sensor design) or Figure 4-2 (high
pressure sensor design) for assembly details.

E. Wipe away all moisture from inside the chamber

with a clean, dry, soft cloth.

F. Note the factory-certified value on the Cal-Cube™

assembly, and insert the cube into the sensor in
place of the baffle assembly. Without replacing the
flow chamber cover, close sensor enclosure door.

4. If the reading is within ± 10% of the Cal-Cube™ value,
the system is “in calibration.” If not, re-calibrate (see
Part Three, Section 5.2, 5.3, or 5.4 for details).

5. After checking calibration, remove the Cal-Cube™
assembly and re-install the baffle assembly.

6. Replace the flow chamber cover. Make sure the cover
O-ring is well lubricated with the supplied silicone lubri­cant. If not, the cover may be difficult to remove the
next time.

7. Turn the sensor’s 3-way valve handle to the

OPERATE

position as shown by the label at the base of the flow
chamber (

Ö

points towards INLET fitting).

Ö

Accu4™ Low-range Turbidimeter System Rev. 2-300

8. Press

ENTER key

to display the active measurement
reading on the “CONFIRM ACTIVE?” output status
screen. When the reading corresponds to the actual
typical process value and is stable, press

ENTER key

again to change the analog output states back to active.

64

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

6.3 OVERFEED RESET
(relay timers)

When a relay overfeed timer “times out,” as indicated by its
blinking annunciator, the timer must be manually reset using
TEST/MAINT menu screens. The relay annunciator stops
blinking after reset.

set at once.

1. With the
to select the “OVERFEED RESET” line.

2. Press

3. Press
ers at once (“OVERFEED RESET: DONE” screen
appears, acknowledging reset has occurred).

ENTER key

ENTER key

All overfeed timers are manually re-

key

screen displayed, use

to display “OVERFEED RESET” screen.

again to reset all relay overfeed tim-

Ø

Ø

6.4 OUTPUT (1 and 2)
Analog Test Signals

4. To return to the “TEST/MAINT” top-level menu screen,
press

The analyzer can provide analog output test signals of a
desired mA value to confirm operation of connected de­vices.

Provide an Output 2 test signal in the same way using
its respective menu screens.

1. With the screen displayed, use
to select the “OUTPUT 1” line.

ESC

This procedure provides an Output 1 test signal.

ENTER key

or

.

key

Ø

Ø

☞

Rev. 2-300 Accu4™ Low-range Turbidimeter System

2. Press

ENTER key

.

to display a screen like

NOTE: The mA test signal for Output 1 is now active.

Its value is shown on this screen.

65

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

3. Adjust the displayed value to obtain the desired mA test
signal. (Use

keys

for fine adjust.)

Ö

Ö

and

keys

Õ

Õ

for coarse adjust;

and

Ø

Ø

×

×

4. To end the output test signal and return to the “TEST/
MAINT” top-level menu screen, press

ESC

ENTER key

or

.

6.5 RELAY (A, B, C, and D)
Operating Test

Relays A, B, C, and D can be tested to confirm their opera-

This procedure tests Relay A. Test other relays in

tion.

the same way using their respective menu screens.

key

1. With the screen displayed, use

Ø

Ø

to select the “RELAY A” line.

2. Press

ENTER key

to display . Relay A
should be energized. Confirm this by checking the NO
and NC relay output terminals with a continuity meter.

or

3. Press

×

×

Ø

Ø

key

once to display . Relay
A should now be de-energized. Confirm this by checking
the NO and NC relay output terminals with a continuity
meter.

6.6 SENSOR TYPE
Checking

Accu4™ Low-range Turbidimeter System Rev. 2-300

4. To end this test and return to the “TEST/MAINT” top­level menu screen, press

ESC

ENTER key

or

.

You can check the type of sensor used with your analyzer.

key

1. With the

screen displayed, use

Ø

Ø

to select the “SENSOR TYPE” line.

66

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

6.7 EPROM VERSION
Checking

2. Press

3. To return to the “TEST/MAINT” top-level menu screen,
press

You can check the version of EPROM used in the analyzer.

1. With the screen displayed, use
to select the “EPROM VERSION” line.

2. Press

ENTER key

ESC

ENTER key

ENTER key

or

to view the sensor type screen.

.

key

Ø

Ø

to view the EPROM version screen.

6.8 SIM SENSOR Setting

3. To return to the “TEST/MAINT” top-level menu screen,
press

You can simulate a measured turbidity value to make the
relays and analog outputs respond accordingly.

1. With the screen displayed, use
to select the “SIM SENSOR” line.

2. Press

ESC

ENTER key

ENTER key

or

.

.

key

Ø

Ø

to display a screen like

☞

Rev. 2-300 Accu4™ Low-range Turbidimeter System

NOTE: The value shown on this screen is now active,

providing a corresponding mA value for both
analog output signals. (The relays, depending
on their configured settings, may also respond
to this simulation value.)

67

PART THREE - OPERATION SECTION 6 - TEST/MAINTENANCE

3. Adjust the displayed simulation value to the desired
value. (Use

keys

for fine adjust.)

Ö

Ö

and

Õ

Õ

keys

for coarse adjust;

and

×

×

Ø

Ø

4. To end the simulation and return to the “TEST/MAINT”
top-level menu screen, press

ESC

ENTER key

or

.

6.9 RESET DEFAULTS

You can conveniently reset all stored configuration settings,
including calibration settings, simultaneously to factory-set
defaults.

key

1. With the screen displayed, use

Ø

Ø

to select the “RESET DEFAULTS” line.

2. Press

ENTER key

to display the “RESET DEFAULTS:
ARE YOU SURE?” screen, asking if you really intend to
perform this extreme action. (If you want to abort this
action, press

3. Press

ENTER key

ESC key

now.)

to reset all stored configuration set­tings to factory defaults (“RESET DEFAULTS: DONE”
screen appears, acknowledging reset has occurred).

Accu4™ Low-range Turbidimeter System Rev. 2-300

4. To return to the “TEST/MAINT” top-level menu screen,
press

ESC

68

ENTER key

or

.

PART THREE - OPERATION SECTION 7 - RELAY OVERFEED TIMER FEATURE

ECTION

S

RELAY OVERFEED TIMER FEATURE

7

7.1 Why Use an
Overfeed Timer

The useful relay overfeed timer feature,

CONTROL function relay,

this section.

Suppose that you configure a CONTROL relay with a high
phase to operate in response to increasing measured tur­bidity. The CONTROL relay will then turn on whenever the
measured turbidity exceeds its preset setpoint. When the
measured turbidity decreases below the setpoint by an
amount you preset (the deadband setting), the relay will
turn off. But what if a damaged sensor or a process upset
condition keeps the measured turbidity above the setpoint
or deadband setting? The control element (valve, pump,
etc.) switched by that relay would then continue to operate.
Depending on the application control scheme, this may ex­cessively dispense costly chemical additives or overly drain
or divert the process. Also, the control element itself could
be damaged due to excessive continuous or unusual op­eration such as a pump that is running dry. The useful
overfeed timer prevents undesirable conditions like these
from happening. It restricts how long the relay and its con­nected control element will remain on regardless of conditions.

is described in more detail in

only available to a

7.2 Configuring Relay
Overfeed Timers

7.3 Overfeed Timer
“Timeout” Operation

7.4 Resetting Overfeed
Timers

7.5 Interactions with Other
Analyzer Functions

To set a relay overfeed timer, use its respective configura­tion menu screen. The time you set to restrict how long the
relay stays on (0-999.9 minutes) should be just enough to
provide acceptable results. An excessive setting may waste
chemicals or the process itself. Initially, set this time as an
estimate. Then, by experimenting and observing the re­sponse, periodically “fine tune” to optimize the setting.

When a CONTROL relay is on and its overfeed timer “times
out,” its annunciator will blink. This indicates that the relay
is now off and will remain off until you manually reset the
overfeed timer. After reset, the relay annunciator stops
blinking. (All overfeed timers are reset simultaneously.)

To manually reset all relay overfeed timers, please refer to
Part Three, Section 6.3.

A relay overfeed timer can, and often will, interact with other
analyzer functions while those functions are in use. Table C
on the next page explains common overfeed timer interac­tions.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

69

PART THREE - OPERATION SECTION 7 - RELAY OVERFEED TIMER FEATURE

y

)

y

y

y

Table C -- RELAY OVERFEED TIMER INTERACTIONS

WITH OTHER ANALYZER FUNCTIONS

Function Conditions Resulting Action of Overfeed Timer

Manually Holding Relay Operation (when outputs are held at start of calibration)

Off relay held

in “off”

On relay held

in “on”

On relay held

in “on”

Manually Transferring Relay Operation (when outputs are transferred at start of calibration)

Off relay is

transferred to “on”

On relay is

transferred to “off”

On relay is

transferred to “off”

Overfeed timer

was off

Overfeed timer

was counting

Overfeed timer

was timed out

Overfeed timer

was off

Overfeed timer

was counting

Overfeed timer

was timed out

Overfeed timer remains off. After you change back to
ACTIVE from the HOLD mode, the overfeed timer will remain
off until the measured value (or a value you simulate) causes
the relay to turn on.

Overfeed timer continues its “count down” until it turns the rela
off. If you release HOLD before the timer “times out,” the timer
continues its “count down” until it turns the relay off or the timer
automatically resets when the measured value (or a value you
simulate

causes the relay to turn off. If you release HOLD after
the timer has “timed out,” it must be manually reset (Part Three,
Section 6.3).

Overfeed timer remains off which keeps the relay turned off.
You must manually reset the timer (Part Three, Section 6.3).

Overfeed timer starts its “count down” until it turns the relay off.

ou change the “on” relay back to “off,” the overfeed timer

After
automatically resets.

Overfeed timer automatically resets. After you change the “off”
relay back to “on,” the overfeed timer starts its “count down”
until it turns the relay off, or the timer automatically resets
again when the measured value (or a v alue you simulate)
causes the relay to turn off.

Manually Testing Relay Operation (using TEST/MAINTENANCE menu screens)

Off relay is

changed to “on”

On relay is

changed to “off”

On relay is

changed to “off”

Operating a Relay By Simulating a Value (using TEST/MAINTENANCE menu screens)

Off relay is turned “on”

by simulated value

On relay is turned “off”

by simulated value

On relay is turned “off”

by simulation value

Overfeed timer

was off

Overfeed timer

was counting

Overfeed timer

was timed out

Overfeed timer

was off

Overfeed timer

was counting

Overfeed timer

was timed out

Overfeed timer starts its “count down” until it turns the relay off.

ou change the “on” relay back to “off,” the overfeed timer

After
automatically resets.

Overfeed timer automatically resets. After you change the “off”
relay back to “on,” the overfeed timer starts its “count down”
until it turns the relay off, or the timer automatically resets
again when the measured value (or a v alue you simulate)
causes the relay to turn off.

Overfeed timer starts its “count down” until it turns the relay off.

ou change the “on” relay back to “off,” the overfeed timer

After
automatically resets.

Overfeed timer automatically resets. After you change the “off”
relay back to “on,” the overfeed timer starts its “count down”
until it turns the relay off, or the timer automatically resets
again when the measured value (or a v alue you simulate)
causes the relay to turn off.

Accu4™ Low-range Turbidimeter System Rev. 2-300

70

PART THREE - OPERATION SECTION 8 - HART OPTION

ECTION

S

HART OPTION

8

8.1 Introduction

☞

Your GLI analyzer may be equipped with the HART® Field
Communications Protocol option for two-way digital com­munication. This option enables you to configure the
analyzer and retrieve its measured data by using:

•

A hand-held terminal such as a HART Communicator

Model 275 (or other HART®-compatible configurator)
containing GLI Device Specific Command sets in its
non-volatile memory

•

An IBM-compatible PC with appropriate HART® Field

Communications Protocol software

NOTE: Any generic hand-held terminal can also communi-

cate with a GLI HART-equipped analyzer, with
limited operability, using HART Protocol Universal
Commands and/or Common Practice Commands.

The hand-held terminal or PC must be connected to the
analyzer 4-20 mA analog Output 1 signal anywhere along
the wiring circuit. See subsections 8.3 or 8.4 for more details.

HART Information Reference Listings

To obtain complete information on the HART Field Commu­nications Protocol, contact:

HART Communication Foundation
9390 Research Blvd, Suite II-250
Austin, Texas 78759 USA

Telephone: [512] 794-0369
Fax: [512] 794-8893
Website: www.hartcomm.org

For information on the HART Communicator Model 275,
contact:

Fisher-Rosemount Systems
12000 Portland Avenue South
Burnsville, Minnesota 55337-1535 USA

Headquarters: [612] 895-2000
Service: [800] 654-7768
Fax: [612] 895-2244

Rev. 2-300 Accu4™ Low-range Turbidimeter System

71

PART THREE - OPERATION SECTION 8 - HART OPTION

8.2 Analyzer Operating
Modes for
HART Network

HART enables simultaneous analog and digital communi­cation. The analyzer can be operated in a SINGLE MODE
or MULTI-DROP mode for the HART network. An analyzer
switch setting selects the mode.

When the analyzer is set to operate in the SINGLE (Point­to-Point) MODE, as set by the factory, HART preserves the
integrity of the 4-20 mA analog Output 1 signal for normal
use while enabling two-way digital communication between
a single analyzer and querying device(s). The analog signal
represents the measured process value. The digital signal,
encoded onto the analog signal, can be used to:

•

Perform all available analyzer functions (presently, only

when using a HART Communicator Model 275.)

•

Calibrate, configure, and acquire all analyzer settings,

and retrieve analog output values and measured proc­ess value(s).

•

Assign device preferences such as a tag, descriptor,

message, and date field (for example, to show last cali­bration date).

☞

•

Acquire device information such as analyzer model

number, identification number, distributor, etc.

•

Acquire HART information including polling address

and number of required preambles.

Your HART-equipped “smart” GLI analyzer can also be se­lected to operate in an all-digital MULTI-DROP mode. This
enables you to connect up to 15 analyzers -- all set for
MULTI-DROP operating mode -- to the querying device(s)
using a common 4-20 mA output cable, creating an efficient
multi-analyzer two-way digital communications network.

NOTE: In the MULTI-DROP mode, the 4-20 mA analog

Output 1 signal of each analyzer becomes dedi­cated only for network use and cannot be used as a
normal output.

Set for either SINGLE MODE or MULTI-DROP operation,
the GLI analyzer is always a “slave,” responding to com­mands received from the “master.” The master can be a
hand-held terminal or an IBM-compatible computer with
HART-capable software (or software including GLI Device
Specific Command sets). The GLI analyzer never initiates a
command sequence, but always responds to commands
from the master. Up to two master devices may be

Accu4™ Low-range Turbidimeter System Rev. 2-300

72

PART THREE - OPERATION SECTION 8 - HART OPTION

connected to each HART loop. Typically, the primary master
is a management system or a PC, while the secondary
master is usually a hand-held terminal.

☞

NOTE: All HART-equipped GLI analyzers are supplied with

their SINGLE MODE/MULTI-DROP switch set to
the SINGLE MODE position to preserve analog
Output 1 for normal use.

To set the analyzer operating mode for the HART network,
locate the

SINGLE MODE/MULTI-DROP

switch (Figure 3-2)

and set the switch to the desired mode:

•

SM (left) position for SINGLE MODE

MD

•

(right) position for MULTI-DROP mode

8.3 SINGLE MODE
(Point-to-Point)
Wiring Arrangement

FIGURE 3-2 Location of SINGLE MODE/MULTI-DROP Switch

(Hart-equipped analyzers only)

When the GLI analyzer is set to operate the HART network
in the SINGLE (Point-to-Point) MODE, the master(s) is in­tended to communicate with only a single analyzer. Refer to
Figure 3-3 and connect all devices, including up to two
masters, to the 4-20 mA analog Output 1 signal.

FIGURE 3-3 HART SINGLE MODE (Point-to-Point) Wiring Arrangement (for single analyzer)

Rev. 2-300 Accu4™ Low-range Turbidimeter System

73

PART THREE - OPERATION SECTION 8 - HART OPTION

8.4 MULTI-DROP
Wiring Arrangement

☞

When the GLI analyzer is set to operate the HART network
in the MULTI-DROP mode, the master(s) is intended to
communicate with up to 15 analyzers.

NOTE: When analyzers are operated in the MULTI-DROP

mode, the 4-20 mA analog OUTPUT 1 signal of
each analyzer is dedicated only for network use -­not its normal use. (During startup, each analyzer is
assigned a non-zero polling address, causing its
Output 1 to automatically provide a constant 4 mA
signal.) Each analyzer’s analog OUTPUT 2, how­ever, remains available for normal use.

1. Make sure the
each analyzer is set to the MD (right) position.

2. Refer to Figure 3-4 and connect the 4-20 mA analog
Output 1 signal of each analyzer (up to 15) in parallel
on one cable, matching polarity as shown.

3. Connect an appropriate sized power supply in parallel
with the analog Output 1 signal, matching polarity as
shown.

SINGLE MODE/MULTI-DROP

switch of

4. Connect up to two masters to the 4-20 mA analog Out­put 1 signal cable.

FIGURE 3-4 HART MULTI-DROP Wiring Arrangement (for multiple analyzer network)

Accu4™ Low-range Turbidimeter System Rev. 2-300

74

PART THREE - OPERATION SECTION 8 - HART OPTION

8.5 HART Preferences
Setup

Use a hand-held HART terminal or HART-capable PC to set
HART preference information. When using a Model 275
HART Communicator to access preference menus, select
the “GLI SETUP” line in the MAIN MENU screen and press

key

the

to reveal this screen:

M33/53C: GLI
GLI SETUP
1 HART INFOsdd sdsdsds
2 DEVICE INFO
3 MASTER RESET

SAVE HOME

Use the “HART INFO” submenu to:

•

Change the polling address used by the master to

identify a device (analyzer).

•

View the number of preambles required by a device

(analyzer) from the master.

Changing

Polling Address

Viewing Number of

Required Preambles

1. With the “GLI SETUP” top-level menu screen dis­played, select the “HART INFO” line and press

key

.

2. With the “HART INFO” submenu screen displayed, se­lect the “Poll addr” line and press the

key

to display

its related screen.

3. Assign a polling address of “0” for one analyzer in a
point-to-point configuration, or 1 through 15 for two or
more analyzers in a multi-drop configuration. Use the
alphanumeric keys to directly select the number, or the
arrow keys to adjust the number digit by digit.

4. Press the

F2 key

F4 key

to enter the polling address, and the

to send the polling address to the analyzer.

The “Num req preams” information screen shows the num­ber of preambles required by the analyzer from the master.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

1. With the “GLI SETUP” top-level menu screen dis-

key

played, select the “HART INFO” line and press

75

.

PART THREE - OPERATION SECTION 8 - HART OPTION

2. With the “HART INFO” submenu screen displayed, se­lect the “Num req preams” line and press the

key

to

display its related information screen.

8.6 Device Preferences
Setup

3. Press the

F4 key

to return to the “HART INFO” sub-

menu screen.

Using a handheld HART terminal or HART-capable PC, set
device (analyzer) preference information.

When using a Model 275 HART Communicator, the
“DEVICE INFO” submenu enables you to:

•

View the final assembly number of a device.

•

View the model number of a device.

•

View the manufacturer name of a device.

•

Assign a tag associating a device with its installation.

•

Assign a descriptor that is associated to a device.

•

Assign a message that is associated to a device.

•

Assign a user-defined date.

•

View the identification number of a device.

•

View the revision number(s) of a device.

Viewing Final

Assembly Number

Viewing

Model Number

The “Final asmbly num” information screen shows the final
assembly number of the analyzer.

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

2. With the “DEVICE INFO” submenu screen displayed,
select the “Final asmbly num” line and press the

key

to display its related information screen.

3. Press the

F4 key

to return to the “DEVICE INFO” sub-

menu screen.

The “Model” information screen shows the model number of
the analyzer.

1. With the “GLI SETUP” top-level menu screen dis-

key

played, select “DEVICE INFO” line and press

.

Accu4™ Low-range Turbidimeter System Rev. 2-300

76

PART THREE - OPERATION SECTION 8 - HART OPTION

2. With the “DEVICE INFO” submenu screen displayed,
select the “Model Type” line and press the

key

to

display its related information screen.

Viewing Manufacturer

Assigning a Tag

3. Press the

F4 key

to return to the “DEVICE INFO” sub-

menu screen.

The “Manufacturer” information screen shows the company
that manufactured the analyzer.

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

2. With the “DEVICE INFO” submenu screen displayed,
select the “Manufacturer” line and press the

key

to

display its related information screen.

3. Press the

F4 key

to return to the “DEVICE INFO” sub-

menu screen.

A tag is text that associates a device with its installation.
Though a tag can be used in any way, there are several
recommended uses. For example, the tag can be a unique
label for a facility that corresponds to a device label, such
as a facility drawing or a control system. The tag can also
be used as a type of data link layer address.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

2. With the “DEVICE INFO” submenu screen displayed,
select the “Tag” line and press the

key

to display its

related screen.

3. Assign a tag. Use the alphanumeric keys to directly
create the text, or the arrow keys to adjust the text
character by character.

4. Press the

F4 key

to enter the tag, and the

F2 key

to

send the tag to the analyzer.

77

PART THREE - OPERATION SECTION 8 - HART OPTION

Assigning a Descriptor

Assigning a Message

A descriptor is text that is associated to a device. It can be
used in any imaginable way.

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

2. With the “DEVICE INFO” submenu screen displayed,
select the “Descriptor” line and press the

key

to dis-

play its related screen.

3. Assign a descriptor. Use the alphanumeric keys to di­rectly create the text, or the arrow keys to adjust the text
character by character.

4. Press the

key

to send the descriptor to the analyzer.

F4 key

to enter the descriptor, and the

F2

A message is text that is associated to a device. It can be
used in any imaginable way.

Assigning

User-defined Date

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

2. With the “DEVICE INFO” submenu screen displayed,
select the “Message” line and press the

key

to dis-

play its related screen.

3. Assign a message. Use the alphanumeric keys to di­rectly create the text, or the arrow keys to adjust the text
character by character.

4. Press the

F4 key

to enter the message, and the

F2 key

to send the message to the analyzer.

The “Date” information screen shows a user-defined date
that can be used in any imaginable way.

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

Accu4™ Low-range Turbidimeter System Rev. 2-300

2. With the “DEVICE INFO” submenu screen displayed,
select the “Date” line and press the

key

to display its

related information screen.

78

PART THREE - OPERATION SECTION 8 - HART OPTION

3. Assign a date.

Viewing

Identification (ID)

4. Press the

F4 key

to enter the date, and the

F2 key

to

send the date to the analyzer.

The “Device id” information screen shows the number that
uniquely identifies the analyzer. The ID number cannot be
changed by the communicator (master).

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

2. With the “DEVICE INFO” submenu screen displayed,
select the “Device id” line and press the

key

to dis-

play its related information screen.

3. Press the

F4 key

to return to the “DEVICE INFO” sub-

menu screen.

Viewing Revisions

The “DEVICE REVISION” line enables access to three revi­sion level information screens:

•

Universal Rev: Revision of the universal device de-

scription that the analyzer conforms to.

•

Fld Device Rev: Revision of the analyzer-specific de-

scription that the analyzer conforms to.

•

Software Rev: Revision of the software (firmware) that

is embedded in the analyzer.

1. With the “GLI SETUP” top-level menu screen dis­played, select “DEVICE INFO” line and press

key

.

2. With the “DEVICE INFO” submenu screen displayed,
select the “Device revision” line and press the

key

.

3. With the “DEVICE REVISION” sub-submenu screen
displayed, select the appropriate line and press the

key

to display its related information screen.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

4. Press the
menu screen.

79

F4 key

to return to the “DEVICE INFO” sub-

PART THREE - OPERATION SECTION 8 - HART OPTION

8.7 “Master Reset”
Function

8.8 “Refresh” Function

HART enables you to reset the analyzer to factory-default
values using the “GLI SETUP” menu of the master. The
execution of this command may take a relatively long time
to complete. Consequently, the analyzer cannot respond to
other commands until reset is complete.

1. With the “GLI SETUP” top-level menu screen dis­played, select “MASTER RESET” line and press

key

2. After the “MASTER RESET” submenu screen appears,
select the “Yes” line.

3. Press the

F4 key

to execute master reset and to return

to the “GLI SETUP” top-level menu screen.

The “REFRESH” function enables you to initiate HART to re­synchronize the master to the analyzer in case changes made
at the analyzer are not reflected by the hand-held terminal.

.

8.9 Protocol Command
Set for PC Program­ming

NOTE: Since HART only performs housekeeping tasks

upon initialization, the “REFRESH” function need
only be performed once. However, it may be used
anytime thereafter to refresh the variables in the
master.

1. With the “MAIN MENU” top-level menu screen dis­played, select the “REFRESH” line and press the

key

.

2. A “Please wait...” message will be displayed until the
master has finished retrieving variables from the ana­lyzer. Thereafter, the display will be returned to the
“MAIN MENU” top-level screen.

The Universal Commands and some Common Practice
commands inherent in the HART protocol can be used for
limited operability. The Device Specific Command set for all
existing GLI analyzers is available on request for creating a
full-featured HART-capable program to run on an IBM­compatible PC.

Accu4™ Low-range Turbidimeter System Rev. 2-300

80

PART FOUR - SERVICE AND MAINTENANCE SECTION 1 - GENERAL INFORMATION

PART FOUR - SERVICE AND MAINTENANCE

ECTION

S

GENERAL INFORMATION

1

1.1 Cleaning Sensor
Flow Chamber

☞

☞

1. Open the Model 8320 sensor enclosure door to access
the flow chamber.

2. After draining the sensor, remove the flow chamber
cover by turning it 1/8 turn counterclockwise to disen­gage its four tabs, and lift it straight off the chamber.

NOTE: For high pressure design sensor (Figure 4-2),

remove flow chamber cover lockring and win­dow by unscrewing lockring counterclockwise.

3. Remove the baffle assembly. It is “keyed” with a slot
and guide rib on its left side to fit only one way in the
flow chamber.

NOTE: The high pressure design sensor uses the same

baffle assembly, but this assembly is “keyed” with
a rod and hole -- not a slot and guide rib.

4. Wipe the inside surface of the flow chamber with a soft,
clean, damp cloth.

FIGURE 4-1 Standard Design Sensor -- Component Details

Rev. 2-300 Accu4™ Low-range Turbidimeter System

81

PART FOUR - SERVICE AND MAINTENANCE SECTION 1 - GENERAL INFORMATION

5. Rinse the baffle assembly with clean water. Wipe it off
with a clean dry cloth if necessary.

6. Insert the baffle assembly into the flow chamber and
replace the cover (for high pressure design sensor, re­place O-ring, window, and lockring).

1.2 Cleaning Optional
Cal-CubeTM Assembly

☞

NOTE: Make sure the cover O-ring is well lubricated

with the supplied lubricant, and properly seated
before tightening the cover or lockring. If not,
the cover may be difficult to remove next time.

Recommendation:

CubeTM assembly inside its protective box in a cool, dry place.

If dirt or dust accumulates on the glass cube,

its surface with your fingers

certified value. Dip the cube assembly in isopropyl alcohol
to remove dust and finger oil. Use compressed air or a soft,
clean optical cloth to dry the cube.

DO NOT WIPE THE GLASS CUBE WITH TISSUES OR
PAPER TOWELS. SMALL WOOD FIBERS FOUND IN
THESE PRODUCTS WILL SCRATCH THE GLASS
SURFACE OF THE CUBE WHICH MAY CHANGE ITS
CERTIFIED VALUE.

When not in use, properly store the Cal-

do not touch

. Finger oil will change its

CAUTION:

FIGURE 4-2 High Pressure Design Sensor -- Component Details

Accu4™ Low-range Turbidimeter System Rev. 2-300

82

PART FOUR - SERVICE AND MAINTENANCE SECTION 1 - GENERAL INFORMATION

1.3 Replacing Sensor
Light Source or
Detector

Removing

Inoperative Part

☞

When the TEST/MAINT “STATUS: SOURCE 1 (or 2)”
screen or “STATUS: DETECT 1 (or 2)” screen indicates
“FAIL,” the respective sensor LED light source or detector
may be disconnected, incorrectly wired, or inoperative.

1. Open the Model 8320 sensor enclosure door to access
the inoperative light source or detector.

2. After draining the sensor, remove the flow chamber
cover by turning it 1/8 turn counterclockwise to disen­gage its four tabs, and lift it straight off the chamber.

NOTE: For high pressure design sensor (Figure 4-2),

remove the flow chamber cover lockring and
window by unscrewing the lockring counter­clockwise.

3. Remove the black retainer clip from its slot in the flow
chamber.

4. Extract the inoperative light source or detector from its
receptacle.

☞

Installing

New Part

☞

NOTE: Extraction may be difficult because light sources

and detectors have double O-ring seals. To ease
removal, grasp the component by hand and twist
it back and forth while extracting it.

5. Disconnect the wires of the inoperative light source or
detector from the sensor terminal board.

# - - - - - # - - - - - #

1. Carefully replace the new light source or detector as­sembly into its receptacle. Refer to Part Five -- Spare
Parts -- for the GLI assembly part numbers.

NOTE: Lubricate O-rings with the lubricant supplied to

help ease the component into place. Make sure
the light source or detector is fully inserted.

2. Replace the black retainer clip to secure the new light
source or detector.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

3. Refer to Figure 4-3 and connect its wires, by color, to
the sensor terminal board.

83

PART FOUR - SERVICE AND MAINTENANCE SECTION 1 - GENERAL INFORMATION

4. Replace the flow chamber cover. (For high pressure
design sensor, replace the O-ring, window, and lock­ring.)

☞

NOTE: Make sure the cover O-ring is well lubricated

with the supplied lubricant, and properly seated
before tightening the cover or lockring. If not,
the cover may be difficult to remove next time.

Re-calibrating

Measurement

System

Accu4™ Low-range Turbidimeter System Rev. 2-300

Figure 4-3 Turbidity Sensor Terminal Block Designations

After replacing any light source(s) or detector(s), always
re-calibrate the measurement system using the appropriate
method. Refer to Part Three, Section 5 for details.

84

PART FOUR - SERVICE AND MAINTENANCE SECTION 1 - GENERAL INFORMATION

1.4 Replacing Fuse(s)

The analyzer is equipped with two board-mounted fuses
(type T slow-blow; 5 mm x 20 mm size). Fuse values are
shown by the fuses (Figure 2-8 or 2-9). The fuses protect
the 115 and 230 volt line power circuits.

WARNING:

DISCONNECT LINE POWER TO AVOID THE
POSSIBILITY OF ELECTRICAL SHOCK.

1. After disconnecting line power, open the analyzer door
and locate the fuses (shown in Figure 2-8 or 2-9).

2. Remove the blown fuse and replace it with a GLI fuse
or an equivalent (GLI fuse kit part number is
1000G3315-101).

3. Reconnect line power and close the analyzer door.

1.5 Replacing Relays

1.6 Inspecting
Sensor Cable

The analyzer relays are soldered into a complex, multi­layered circuit board. To avoid the possibility of damaging
this board while attempting to replace a relay:

•

Simply return the complete analyzer to the GLI Cus-

tomer Service Dept. or your local factory-authorized
service organization for relay replacement.

-- or --

•

Replace the complete scaling board assembly contain-

ing the relays. Refer to Part Five -- Spare Parts -- for
the GLI scaling board assembly part number.

If a measurement problem exists and you suspect the sen­sor cable, inspect it for physical damage. If an interconnect
cable is used, check the junction box, then disconnect the
cable at both ends (sensor and analyzer) and, using an
ohmmeter, check its wires for continuity and internal shorts.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

85

PART FOUR - SERVICE AND MAINTENANCE SECTION 2 - PRESERVING MEASUREMENT ACCURACY

ECTION

S

PRESERVING MEASUREMENT ACCURACY

2

2.1 Eliminating Bubbles in
Sensor Flow Chamber

Restricting

Sensor Outlet

Two kinds of air or gas bubbles may exist in the sample:
those that can be seen and those that cannot. Visible bub­bles are created by mixing liquid and air. For example,
water falling down or flowing through a pipe containing air
will form bubbles. Bubbles that cannot be seen in liquid, but
that do form and become visible in the sensor flow chamber
are absorbed in the liquid. This can occur naturally or be
the result of human intervention such as when ozone is in­jected into water to act as a disinfectant.

To remove visible bubbles in liquid, a bubble trap may be
necessary. To minimize the effect of bubbles that cannot be
seen, but that eventually form on the flow chamber win­dows, the liquid must be pressurized while it is being
measured. This is easily accomplished by restricting the
outflow from the Model 8320 turbidity sensor. To do this:

1. Maintain the flow rate through the sensor within its
specified limits (0.05 to 7 GPM).

2. Install a flow restrictor into the sensor outlet line and
adjust it until flow is slightly reduced.

Using an External

Bubble Trap

3. Close the 3-way valve to stop flow through the sensor.

4. Drain the flow chamber using the 3-way valve and cali­bration funnel.

5. Slowly open the 3-way valve to allow the flow chamber
to slowly fill with sample liquid.

The above procedure should ensure bubble-free operation.

For low sample flow rates (less than 0.5 GPM), the Model
8320 turbidity sensor has a built-in bubble trap to minimize
air accumulation in the flow chamber. For higher flow rates,
it is recommended to use an external bubble trap/stilling
chamber (GLI part number 80A1020) to collect and vent off
air or gas from the liquid. The bubble trap must be installed
vertically (air vent upward) and upstream of the sensor.
(The air vent on GLI’s external bubble trap/stilling chamber
can be opened or closed. Bubbles remain in solution when
the vent is closed, or are vented off when it is opened.)

Periodically, it is recommended to remove the bubble trap
drain plug to allow any accumulated sediment sludge to drain.

Accu4™ Low-range Turbidimeter System Rev. 2-300

86

PART FOUR - SERVICE AND MAINTENANCE SECTION 2 - PRESERVING MEASUREMENT ACCURACY

2.2 Keeping Flow
Chamber Clean

2.3 Keeping System
Calibrated

The Accu4™ Low-range Turbidimeter System has reactive
diagnostics to alert you when the sensor flow chamber
needs cleaning. When an abnormal system diagnostic con­dition has been detected, the MEASURE screen will flash
the “WARNING CHECK STATUS” message. Depending on
the selected activation mode for a STATUS relay (FAIL,
WARN or ALL), this may or may not automatically energize
a STATUS relay corresponding to that specific type of con­dition. To determine if the sensor needs cleaning, display
the “STATUS: SENSOR” screen in the TEST/MAINT menu
branch. When this screen indicates:

•

CHAMBER DIRTY -- System diagnostics has detected

degrading measurement performance, typically caused
by dirty flow chamber windows. Refer to Part Four, Sec­tion 1.1 for instructions to clean the flow chamber.

•

OK -- Check the other status screens to determine the

condition causing the warning message.

Depending on the circumstances of the application, periodi­cally verify system calibration to maintain measurement
accuracy.

2.4 Avoiding Electrical
Interference

☞

☞

☞

Maintenance Tip!

system until operating experience can determine the
optimum time between calibrations that provides ac­ceptable measurement results.

Calibrate the system using an appropriate method. Refer to
Part Three, Section 5 for details.

measurement error is calibrating with an incorrectly
prepared formazin suspension.

NOTE: When calibrating with a formazin suspension,

carefully prepare the suspension using Class A
laboratory glassware and correct analytical tech­niques. This is very essential to attain accurate
measurement results.

Recommendation:

connect cable, if used) in the same conduit with line power.

Maintenance Tip!

motors or other equipment that may generate electrical or
magnetic fields. Cut cables to proper length during instal­lation to avoid unnecessary inductive pickup (“electrical
noise” may interfere with sensor signal).

Upon startup, frequently check the

A common cause of

Do not run the sensor cable (and inter-

Excess cable should not be coiled near

Rev. 2-300 Accu4™ Low-range Turbidimeter System

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PART FOUR - SERVICE AND MAINTENANCE SECTION 3 - TROUBLESHOOTING

ECTION

S

3

TROUBLESHOOTING

3.1 System Diagnostic
Condition Messages

When the system diagnostics detects an abnormal condi­tion, the MEASURE screen flashes the “WARNING CHECK
STATUS” message. To identify the condition causing the
warning, display the “STATUS” screens in the TEST/MAINT
menu branch (Part Three, Section 6.1). Pressing the

ENTER key

Displayed STATUS Screen Meaning

ANALYZER: OK ............................. Analyzer is operating properly.

SENSOR: OK .................................. Sensor is operating properly.

sequentially displays these status screens:

Table D -- SYSTEM DIAGNOSTIC CONDITION

STATUS SCREENS/MEANINGS

FAIL........................... Analyzer is not operating properly. Call

GLI Customer Service Dept.

CHAMBER DIRTY........... Clean the sensor flow chamber. See

Part Four, Section 1.1.

CHAMBER UNKNOWN ... Sensor is disconnected, incorrectly

wired, or sources or detectors are not
operating properly. Call GLI Customer
Service Dept.

SOURCE 1 (or 2): OK..................... Light source is operating normally.

FAIL .................. Light source is disconnected, incorrectly

wired, or not operating properly. Call GLI
Custom er Service Dept.

DETECT 1 (or 2): OK..................... Detector is operating normally.

FAIL .................. Detector is disconnected, incorrectly

wired, or not operating properly. Call GLI
Custom er Service Dept.

RELAY (A, B, C, D): ACTIVE............ Relay is energized. The measured

value has reached the setpoint (control
relay) or the low or high alarm point
(alarm relay), or a system diagnostic
condition exists (status relay).

INACTIVE.......... Relay is de-energized. The measured

value has not reached the setpoint
(control relay) or the low or high alarm
point (alarm relay), or a system diag­nostic condition has not been detected.

TIMEOUT.......... Relay is de-energized. The overfeed

timer has timed out and must be
manually reset (control relay only).

COUNTING ........ Relay is energized. The overfeed ti mer

is counting down, but has not yet timed
out (control relay only).

Accu4™ Low-range Turbidimeter System Rev. 2-300

88

PART FOUR - SERVICE AND MAINTENANCE SECTION 3 - TROUBLESHOOTING

3.2 Isolating Measuring
System Problem

Checking Electrical

Connections

Checking Operation

Using System Diagnostics

When experiencing problems, try to determine the primary
measurement system component causing the problem
(analyzer, sensor, or sensor cable).

1. Verify that line power exists at the appropriate analyzer
TB3 terminals.

2. Check all analyzer and sensor cable connections to en­sure that they are correctly wired and securely
tightened.

Use the system diagnostics capability (“STATUS” screens
in TEST/MAINT menu branch) to determine if the analyzer
or sensor is inoperative.

Successfully calibrating the system usually confirms that the
analyzer and sensor are operating properly. If the sensor
cable is suspected, disconnect it at both ends (sensor and
analyzer) and, using an ohmmeter, check its wires for conti­nuity and internal shorts.

Rev. 2-300 Accu4™ Low-range Turbidimeter System

89

PART FOUR - SERVICE AND MAINTENANCE SECTION 4 - ANALYZER REPAIR/RETURN

ECTION

S

4

ANALYZER REPAIR/RETURN

4.1 Customer Assistance

4.2 Repair/Return Policy

If you need spare parts, assistance in troubleshooting, or
repair service, please contact your local GLI representative,
or the GLI Customer Service Department at:

GLI International, Inc. Phone: [800] 543-8907
9020 West Dean Road Fax: [414] 355-8346
Milwaukee, WI 53224 E-mail: [e-mail]



GLI SERVICE DEPARTMENT HOURS

Monday

through

Thursday

Friday

Eastern
Std. Time
8:30 a.m.

to
5:30 p.m.
8:30 a.m.

to
4:00 p.m.

Central

Std. Time

7:30 a.m.

to
4:30 p.m.
7:30 a.m.

to
3:00 p.m.

Mountain

Std. Time

6:30 a.m.

to
3:30 p.m.
6:30 a.m.

to
2:00 p.m.



Pacific
Std. Time
5:30 a.m.

to
2:30 p.m.
5:30 a.m.

to
1:00 p.m.

All analyzers or sensors returned for repair or replacement
must be freight prepaid and include the following informa­tion:

☞

1. A clearly written description of the malfunction.

2. Name of person to contact and the phone number
where they can be reached.

3. Proper return address for shipping analyzer(s) or sen­sor(s) back. Include preferred shipping method (UPS,
Federal Express, etc.) if applicable.

4. A purchase order if analyzer(s) or sensor(s) is out of
warranty to cover costs of repair.

NOTE: If the analyzer or sensor is damaged during return

shipment because of inadequate packaging, the
customer is responsible for any resulting repair
costs. (Recommendation: Use the original GLI
shipping carton or an equivalent.)

Also, GLI will not accept analyzers or sensors re­turned for repair or replacement unless they are
thoroughly cleaned and all process material is re­moved.

Accu4™ Low-range Turbidimeter System Rev. 2-300

90

PART FIVE - SPARE PARTS AND ACCESSORIES

PART FIVE - SPARE PARTS AND ACCESSORIES

Description Part Number

Model T53 Analyzers

with “B” Prefix

Serial Number

Model T53 Analyzers

with No Letter Prefix

Serial Number

Model 8320 Low-range

Turbidity Sensors

Complete Door Assembly:

Without HART option.................................................... T53A2010-003

With HART option.........................................................T53A2010-004

Scaling Board Assembly (for 60 Hz. operation)................. T53A2020-001

Scaling Board Assembly (for 50 Hz. operation)................. T53A2020-002

Ribbon Interconnect Cable ................................................ 1000A3355-001

Complete Door Assembly.................................................. T53A1010-002

Scaling Board Assembly (for 60 Hz. operation)................. T53A1060-002

Scaling Board Assembly (for 50 Hz. operation)................. T53A1060-004

Ribbon Interconnect Cable ................................................ 1000A3334-001

The following parts are common to all T53 analyzers:

Fuse Kit (two fuses per kit; 80 mA and 100 mA) ............... 1000G3315-101

Mounting Hardware Kit ......................................................1000G3228-101

Standard Design Sensor:

Flow Chamber Cover .................................................. 8220C2F1076

Flow Chamber Cover O-ring ....................................... 5H1288

Retainer Clip for Light Source or Detector................... 8220F1078

3-Way Valve for External Plumbing (V2 in Fig. 2-1):

Valve with threads (rated 0-50 psig) ....................... 6H1185

Valve without threads (rated 0-50 psig) .................. 6H1183

Optional Pipe-mount Kit (horizontal or vertical pipe) ... 8320A1070-001

High Pressure Design Sensor:

Flow Chamber Cover Lock Ring ................................. 8220F1016

Flow Chamber Cover Window .................................... 8220A2F1017

Window Clip ............................................................... 8220F1059

Flow Chamber Cover O-Ring...................................... 5H1265

Retainer Clip for Light Source or Detector................... 8220F1075

3-Way Valve for External Plumbing (V2 in Fig. 2-1):

Valve with threads (rated 0-150 psig) ..................... 6H1184

Valve without threads (rated 0-150 psig) ................ 6H1182

Optional Pipe-mount Kit (horizontal or vertical pipe) ... 8220-1040

The following parts are common to both sensors

(standard and high pressure designs):

Baffle Assembly.......................................................... 8220G1060

LED Light Source Assembly

(includes O-ring set and integral cable) .................. 8220G1320-104

Detector Assembly

(includes O-ring set and integral cable) .................. 8220G1330-104

O-Ring for LED Light Source or Detector Module........ 5H1251

Spare Silicone Lubricant ............................................. 6M0920

Optional Cal-Cube

TM

Assembly

(for standard and high pressure design sensors) ...... 8220G1300

Rev. 2-300 Accu4™ Low-range Turbidimeter System

91