YOKOGAWA TB750G Instruction manual

User’s
Manual Model TB750G
Right Angle Scattered Light
Turbidimeter
Quick Start Manual
IM 12E01A06-02E
IM 12E01A06-02E
3rd Edition

i
IM 12E01A06-02E
<Introduction>
INTRODUCTION
nStructure of this Manual
This is a supplementary manual to TB750G Right Angle Scattered Light Turbidimeter for User's Manual
IM 12E01A06-01E. This manual describes the specications, installation, operation, maintenance, and
troubleshooting. To use this instrument correctly, read this manual and User's Manual IM 12E01A06-
01E thoroughly.
nBefore Measurement
The TB750G turbidimeter is preset with defaults prior factory shipment. Before measurement, verify that
these factory default settings meet the operating conditions and if necessary, recongure parameters.
Symbol and Notations Used in this Manual
nSymbol
The following symbol is used in this manual.
CAUTION
Indicates that damage to software or hardware, or system failures could occur if instructions are not
followed.
nNotations
In this manual, operation keys, display messages, indicators, and LED lamps on the instrument are
denoted in the following manner.
1. Operation keys are denoted by brackets [ ] – for example:
YES
: [YES] key
2. Indicators, messages, and numerical data on the display are denoted as follows:
Message display: {*WASH}
Data display: {2.05} (when lit), {2.05} (when ashing)
Media No.IM 12E01A06-02E (CD) 3rd Edition :Feb. 2018 (YK)
All Rights Reserved Copyright © 2006, Yokogawa Electric Corporation

ii
IM 12E01A06-02E
<Introduction>
Notice
nAbout this Manual
lThis manual should be passed on to the end user.
lThis manual should be read thoroughly before operating the instrument.
l This manual explains the functions contained in this product, but does not warrant that they will suit
the particular purpose of the user.
l The contents of this manual shall not be reproduced or copied, in part or in whole, without permis-
sion.
lThe contents of this manual are subject to change without prior notice.
l Every effort has been made to ensure the accuracy in the preparation of this manual. However, if
any errors or omissions are noticed, please contact the nearest Yokogawa representative or sales
ofce.
n Protection,Safety,andModicationoftheProduct
l The safety instructions described in this manual should be strictly observed to ensure safety both
of the product and the system controlled by the product.
l A protection or safety circuit should be installed externally, if needed. Do not attempt to modify or
add such circuit to the inside of the equipment.
nLimitation of Liability
l Yokogawa grants no warranties other than the express warranty set forth under the warranty pro-
visions.
l Yokogawa shall not be liable to you or any third party for any damage, including consequential or
incidental damages, arising out of or in connection with the use of this equipment, defects beyond
our knowledge, or any other contingency beyond our control.

Toc-1
IM 12E01A06-02E
<CONTENTS>
Model TB750G
Right Angle Scattered Light Turbidimeter Quick Start Manual
CONTENTS
IM 12E01A06-02E 3rd Edition
INTRODUCTION .......................................................................................................i
Symbol and Notations Used in this Manual ................................................................. i
Notice ............................................................................................................................... ii
1. OVERVIEW ................................................................................................ 1-1
1.1 Features ............................................................................................................. 1-1
1.2 Measurement Principle .................................................................................... 1-1
2. PIPING AND WIRING ................................................................................ 2-1
2.1 Piping ................................................................................................................. 2-1
2.1.1 System Using Open Head Tank and Zero Turbidity Filter ................. 2-1
2.1.2 System without Head Tank and Zero Turbidity Filter ......................... 2-2
2.2 Wiring ................................................................................................................. 2-3
2.2.1 Wiring Required for TB750G ............................................................. 2-3
2.2.2 Wiring for Detector ............................................................................. 2-4
2.2.3 Wiring for Converter........................................................................... 2-5
3. OPERATION .............................................................................................. 3-1
3.1 Preparation ........................................................................................................ 3-1
3.1.1 Outline................................................................................................ 3-1
3.1.2 Converter Operation Panel ................................................................ 3-1
3.1.3 Calibration.......................................................................................... 3-2
3.1.4 Performing Zero/span Calibration Using Filtered Water as Zero Reference
3-3
3.1.5 Performing 2-point Calibration Using Standard Solution................... 3-7
3.2 Normal Operation.............................................................................................. 3-8
3.2.1 When Sample Water Supply is Cut Off.............................................. 3-8
3.2.2 Shutdown ........................................................................................... 3-8
3.2.3 Restart................................................................................................ 3-8
4. PARAMETER SETTING............................................................................ 4-1
4.1 Outline of Operation, Setting, and Service Levels ........................................ 4-1
4.2 Operation Level................................................................................................. 4-2
4.3 Setting Level...................................................................................................... 4-3
4.4 Service Level ..................................................................................................... 4-4
4.5 Procedures for Setting Parameters ................................................................ 4-6

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IM 12E01A06-02E
<CONTENTS>
5. MAINTENANCE......................................................................................... 5-1
5.1 Lamp Replacement........................................................................................... 5-1
5.2 Calibration ......................................................................................................... 5-2
5.2.1 Outline................................................................................................ 5-2
5.2.2 2-point Calibration Using Turbidity Standard Solutions..................... 5-2
6. TROUBLESHOOTING .............................................................................. 6-1
Revision Information ...............................................................................................i

<1.Overview> 1-1
IM 12E01A06-02E
1. OVERVIEW
1.1 Features
The TB750G is a process turbidimeter employing the right angle light scattering method, and has the
following features.
• Highly reliable measurement with excellent linearity and repeatability
- Linearity: ±2% of reading or ±0.01 NTU, whichever is greater
- Repeatability: ±1% of reading or ±0.002 NTU, whichever is greater
- Display resolution: 0.001 NTU
• Easy-to-clean measurement cell
• Compact, lightweight converter and detector
• User congurable analog output range
- Analog output range: 0-0.2 NTU to 0-100 NTU
• Analog output range switching (2 or 3 ranges)
• Enhanced self-diagnostic function as standard
- Light source failure, input element failure, calibration failure, various circuit failures, etc.
• Detector designed to remove inuence of air bubbles
• A wide range of measurement conditions
- Low ow rate: 0.05 to 20 l/min {0.8 to 317 gal/h}
- High pressure: Up to 500 kPa {72 psi}
- Sample temperature: 0 to 50°C {32 to 122°F}
• Detector can be connected for in-line analysis
• 2 analog outputs, 3 relay contact outputs, and 1 serial communication
• Many options available upon request
• Ultrasonic transducer and oscillator for ultrasonic cleaning
• Various head tanks to accommodate application requirements
1.2 Measurement Principle
The measuring system of the TB750G turbidimeter, comprised of a detector and a converter, complys
with USEPA 180.1.
Receiver (Darkroom)
Scatted Light Detection Element
Scatted Light Detector
Measurement Window (Glass)
Lens
Light Source
(Lamp)
F1-1E.ai
Measuring
Water
Figure 1.1 Measurement Principle

Blank Page

<2. PIPING AND WIRING> 2-1
IM 12E01A06-02E
2. PIPING AND WIRING
2.1 Piping
Piping methods depend on the application, select the appropriate system conguration, and install
pipes accordingly following examples.
2.1.1 System Using Open Head Tank and Zero Turbidity Filter
This is a typical system. A piping diagram is shown in Figure 2.1. Air bubbles in a water sample are
removed by an open head tank and the water sample is introduced into the detector at a stable ow
rate.
h
H
F2-1E.ai
Sample Water
Inlet Drain Port
Sample Water
Outlet
TB750G
Detector
Drain Valve
Sample
Water
Tap
Water
Sample Water
Valve
Zero Turbidity
Filter
Sample Water
Supply Valve
Zero Water Supply Valve
Tap Water
Valve
Drain
Valve
Drain
Drain
Drain
Drain
Sample Water
Sample Water
Effluent
Zero Water
Drain Valve
Other Turbidity Detectors
Zero Water
Head Tank
Flow Control Valve
Figure 2.1 Piping Diagram
• To prevent corrosion of water inside the zero turbidity lter, allow water to ow through the lter
and ow out from the zero water drain valve continuously at a ow rate of approximately 10 ml/
min.
• When using ltered water as zero reference, install a lter with the appropriate pore size
depending on the measuring range.
Measuring range of less than 2 NTU: 0.2 µm
Measuring range of 2 NTU or greater: 1 µm

<2. PIPING AND WIRING>
2-2
IM 12E01A06-02E
2.1.2 System without Head Tank and Zero Turbidity Filter
This is a simple system where a water sample is taken from the process and directly introduced
into the detector. This system conguration can be used when a water sample contains a negligible
amount of air bubbles or when the turbidity of a water sample is high and the effect of air bubbles is
nonsignicant.
CAUTION
Sample water conditions and ambient temperature must meet the specications: maximum pressure:
500 kPa; sample temperature: 0 to 50°C; ambient temperature: -5 to 50°C.
h
F2-2E.ai
Sample Water
Inlet Drain Port
Sample Water
Outlet
TB750G
Detector
Drain Valve
Sample
Water
Tap Water
Sample Water
Valve
Zero Turbidity
Filter
Sample Water
Supply Valve
Zero Water Supply Valve
Tap Water
Valve
Drain
Drain
Sample Water
Zero Water
Flow Control Valve
Sample Water
Effluent
Zero Water
Drain Valve
Other Turbidity Detectors
Process Piping
Figure 2.2 Piping Diagram
• The ow control should not be done on the inlet side of the detector.
• To prevent corrosion inside the zero turbidity lter, allow water to ow through the lter and ow
out from the zero water drain valve continuously at a ow rate of approximately 10 ml/min.

<2. PIPING AND WIRING> 2-3
IM 12E01A06-02E
2.2 Wiring
2.2.1 Wiring Required for TB750G
F2-3E.ai
TB750G Turbidity converterTB750G Turbidity detector
Power
supply *5
TUS400G Ultrasonic Oscillator *5
L1
L2
Power supply
cable
Serial commu-
nication *3*4
(RS-422)
Analog output 1
(4-20mA DC) *3
Analog output 2
(4-20mA DC or
0-20mA DC) *3
Contact input
Ultrasonic transducer
connecting cable
(maximum length: 15m)
(customer wiring)
Dedicated cable (1/2/3m)
G
SG
TX-
TX+
RX-
RX+
G
-
+
-
+
COM
IN2
IN1
OUTPUT
INPUT
RS-422
mA2
mA1
RANGE
FAIL
S2
S1
COM
C
B
A
COM
NC
NO
COM
NC
NO
COM
NC
NO
CONVERT-
ER
POWER
TUS U1U2
G
N
L
L
N
G
GG
U3
U2
U1
S
SENSOR
(Note) Dotted wiring is external wiring. Use cable with 6 to 12 mm OD for wiring.
*1 Power terminal "G" on detector, detector case, and converter case must be grounded (ground resistance: 100Ω or less).
*2 External grounding terminal of ultrasonic oscillator must be grounded (ground resistance: 100Ω or less).
*3 Use 2-conductor shielded cable for analog output wiring and serial communication wiring.
*4 The wiring configuration is described below in case that RS-232C serial communication is selected.
*5 When option code "/US" is specified, TUS400G should be purchased separately.
When TUS400G is used in system, the power supply to TB750G should be the same as the supply voltage specified in the
MS Code of TUS400G.
*6 When "TB750G/US" and "TUS400G-NN-RC" or "TUS400G-NN-KC" is specified, refer to IM 19C1B4-01E for wiring.
Contact
output S1
Contact
output S2
Contact
output FAIL
Range
contact output
Grounding *1
(100Ω or less)
Grounding *2
(100Ωor less)
Grounding *1
(100Ω or less)
Grounding *1
(100Ω or less)
Serial com-
munication
(RS-232C)
G
SG
RXD
TXD
RS-232C
*6
Figure 2.3 Connection Diagram

<2. PIPING AND WIRING>
2-4
IM 12E01A06-02E
2.2.2 Wiring for Detector
Wire for connections to the following terminals:
(1) Power supply terminals;
(2) Power supply terminals for ultrasonic oscillator (when option code “/US” is specied); and,
(3) External grounding terminal.
(1) Power Supply Terminals
Connector for Converter - Detector Cable
(2) Power Supply Terminals for
Ultrasonic Oscillator
Terminal G
(For Converter - Detector
Connecting Cable)
Terminals TM3 (Power to Lamp)
F2-4E.ai
Figure 2.4 Internal View of Detector
(3) External Grounding Terminal (M5 Screw)
(Norminal size of at least 2 mm2)
F2-5E.ai
Figure 2.5 Grounding Terminal of Detector

<2. PIPING AND WIRING> 2-5
IM 12E01A06-02E
2.2.3 Wiring for Converter
Wire for connections to the following terminals:
(1) Analog output/contact input terminals;
(2) Contact output/range contact output terminals;
(3) Serial communication terminals (when in use); and,
(4) Grounding terminal.
Front Cover
Terminal Cover
(3) Serial Communication
Terminals
(2) Contact Output/
Range Contact
Output Terminals
Analog Output/Contact Input Terminals
Front Cover
Converter - Detector
Connecting Cable
Terminal G
(For Converter -
Detector Connecting Cable)
Serial Communication
Terminals
(1) Analog Output/Contact Input Terminals
Connector for
Converter - Detector Cable
F2-6E.ai
(A)
(B)
How to Remove the Terminal Cover
Disconnect the converter-detector connecting cable (A) and its grounding wire (B) from the converter. Remove the terminal cover by
sliding it slightly to the left and pulling it forward.
Figure 2.6 Internal View of Converter
Grounding Wire
(Nominal Size of at least 2 mm2)
(4) Grounding Terminal (M4 Screw)
F2-7E.ai
Toothed Lock Washer
Figure 2.7 Grounding Terminal of Converter

<2. PIPING AND WIRING>
2-6
IM 12E01A06-02E
Contact Output (S1, S2 and FAIL) Wiring
• Be sure to use the contacts meeting the conditions below.
• Functions of contact outputs S1 and S2 should be set in Codes 40 and 41 at service level. Refer
to section 4.3.
Table 2.1 Contact Rating
AC DC
Contact maximum permissible voltage 250 V 30 V
Contact maximum permissible current 2 A 3 A
Contact maximum permissible power
(resistance load) 125 VA 60 W
Table 2.2 Contact Operation
Contact S1, S2 Contact FAIL
Status LED NO NC LED NO NC
In action ON Closed Open ON Open Closed
Not in action OFF Open Closed OFF Closed Open
Power OFF OFF Open Closed OFF Open Closed

<3. OPERATION> 3-1
IM 12E01A06-02E
3. OPERATION
3.1 Preparation
3.1.1 Outline
F3-1E.ai
1. Installation Check
2. Piping Check
3. Wiring Check
4. Supplying Power
5. Warm-up
6. Setting and Checking Parameters
7. Calibration
• Make sure that TB750G converter and detector
are fixed fimly.
• Unused cable inlets should be plugged to
prevent moisture from entering.
• Note that the TB750G does not have an internal
power switch.
• Upon power up, allow the meter to warm up for
at least one hour.
• When using zero turbidity filter, allow water to
run through it for at least one hour.
• For details of calibrations, refer to the following
pages.
8. Supplying a Water Sample and
adjusting the flow rate
• Adjust the opening of the valve at the sample
water out of the detector.
9. Operation check • Make sure that the system is free of defects.
• For details of parameter settings, refer to
chapter 4.
3.1.2 Converter Operation Panel
Operation Key
Operation Key
([*]: To enter the operation level
from measurement mode)
LCD Screen
Contact Status LED
Turbidity Unit Indication
F3-2E.ai

<3. OPERATION>
3-2
IM 12E01A06-02E
3.1.3 Calibration
(1) When performing a calibration using 0.2 or 1.0 µm ltered water as zero reference, refer to
section 3.1.4.
(2) When performing a 2-point calibration using standard solutions, refer to section 3.1.5. Use this
method to perform a calibration complying with EPA 180.1.
Note: The instrument has been pre-calibrated using 0.2 µm ltered water as zero reference at the
factory before shipment.
Calibration Flow Chart
F3-3E.ai
YES
Check block
Standard Solution
NO
* Calibration complying with EPA Method 180.1.
Is filtered water used
as zero reference?
Is span calibration performed
using check block or
standard solution?
Perform span/zero calibration
using filtered water
Perform 2-point calibration
using standard solutions*
Perform zero calibration Perform point calibration
first using zero solution
Perform span calibration
using check block.
Refer to Section 3.1.4.
Perform span calibration
using standard solution.
Refer to Section 3.1.4.
Perform second point
calibration using span solution.
Refer to Section 3.1.5.
Start calibration
End calibration

<3. OPERATION> 3-3
IM 12E01A06-02E
3.1.4 Performing Zero/span Calibration Using Filtered Water as Zero Reference
F3-4E.ai
[YES]
[MODE]
[YES]
[YES]
[ENT]
[NO] [YES]
START
CALB
X.XXX
STD.CAL
X.XXX
ZERO
0.000
VALUE
X.XXX
ZERO
X.XXX
CAL.END
A
• Supply power
• Warm-up (at least 1 hour)
• Allow water to run through the zero filter
• Supply zero water
• Prepare span solution, if necessary
Automatically goes into
maintenance mode and holds
the output.
To span calibration
using check block
B
To span calibration
using standard solution
• Confirm reading has stabilized (3 to 5 min)
Auto-adjustment
{0.000} None configurable
Zero calibration is complete

<3. OPERATION>
3-4
IM 12E01A06-02E
Span calibration using check block
Note: For span calibration using standard solution, refer to next page.
F3-5E.ai
[NO]
[YES]
[YES]
[ENT]
[YES]
[NO]
Check block
END
HOLD
X.XXX
STD.CAL
X.XXX
ZERO
X.XXX
SPAN
XX.XX
SPAN
XX.XX
CAL.END
• Stop supplying zero water
• Drain zero water
• Install check block *
• Supply zero water
• Confirm reading has stabilized (3-5 min)
A
• Check that display reads the value of check block
Span calibration is complete
Auto-adjustment
XX.XX
VALUE {XX.XX} None configurable
Release HOLD **
From zero calibration
* How to install check block
1. Remove the rubber cover from the top of the detector.
2. Remove the retaining plate on the window of the top cover
by loosening the 2 setscrews.
3. Detach the observation window and replace it with the
check block. Fix it with the 2 setscrews securely.
** Be sure to release HOLD

<3. OPERATION> 3-5
IM 12E01A06-02E
Span calibration using standard solution (1/2)
F3-6E.ai
[YES]
[NO]
[NO]
[NO]
(3 times)
[MODE]
[YES]
[]
[MODE]
[YES]
[*] at least second
[]
[YES]
[ENT]
[]
HOLD
*SERV
HOLD
HOLD
HOLD
*SETP
*SERV
B
C
16
*CODE
0
*CAL.TP
{*SETP} -> {*RANGE} -> {*HOLD} -> {*SERV}
To enter operation level
From zero calibration
Before performing span calibration using
standard solution, standard solution/check
block selection should be set to "0 (standard
solution)" in CODE 16 as shown below.
• Enter "16" using []and [] keys
• Enter "0" using [] key

<3. OPERATION>
3-6
IM 12E01A06-02E
Span calibration using standard solution (2/2)
F3-7E.ai
[NO]
[YES]
[YES]
[YES]
[NO]
[ENT]
[ENT]
[YES]
[]
[]
[]
END
HOLD
CALB
X.XXX
STD.CAL
X.XXX
ZERO
X.XXX
SPAN
XX.XX
SPAN
XX.XX
CAL.END
• Remove top cover (6 setscrews)
• Rinse the cell with span solution and drain
• Fill the cell with span solution to 90% *
• Replace top cover with setscrews
• Confirm reading has stabilized (3-5 min)
C
• Enter value of span calibration using [] and [] keys
Span calibration is complete
Auto-adjustment
20.00
VALUE
• Set decimal point using [] key
00.00
VALUE
Release HOLD ***
* How to pour span solution
Pour span solution into the measurement cell very
slowly, using a funnel or relevant equipment, taking
care not to allow air bubbles to enter the cell.
** Number in the figure is an example.
*** Be sure to release HOLD
**

<3. OPERATION> 3-7
IM 12E01A06-02E
3.1.5 Performing 2-point Calibration Using Standard Solution
F3-8E.ai
[YES]
[YES]
[NO]
[YES]
[NO]
[YES]
[ENT]
[ENT]
[YES]
[MODE]
[]
[ENT]
[ENT]
[]
[]
[]
[]
[]
END
HOLD
CALB
X.XXX
STD.CAL
X.XXX
SMP.CAL
X.XXX
ZRSPAN
XX.XX
SPAN
XX.XX
CAL.END
• Remove top cover (6 setscrews)
• Rinse the cell with zero solution and drain
• Fill the cell with zero solution to 90% *
• Replace top cover with screws
• Confirm reading has stabilized (3-5 min)
• Remove top cover (6 setscrews)
• Rinse the cell with zero solution and drain
• Fill the cell with zero solution to 90% *
• Replace top cover with screws
• Confirm reading has stabilized (3-5 min)
Span calibration is complete
Auto-adjustment
X.XXX
SPAN
X.XXX
ZERO Auto-adjustment
20.00
VALUE.S
00.00
VALUE.S
• Enter value of zero calibration using [] and [] keys
• Set decimal point using [] key
• Enter value of span calibration using [] and [] keys
0.020
VALUE.Z
• Set decimal point using [] key
0.000
VALUE.Z
Release HOLD ***
* How to pour zero solution
Pour a span solution into the measurement cell very
slowly, using a funnel or relevant equipment, taking
care not to allow air bubbles to enter the cell.
** Numbers in the figures are examples.
*** Be sure to release HOLD
START
• Supply power
• Warm-up (at least 1 hour)
• Wash the cell
• Prepare zero and span solutions
**
**