ABB 7320 Series User manual

7320 Series
Dissolved Organics Monitor
Instruction Manual
Models 7320 000 – Transmitter
with
7320 100 – Low Level Sensor
7320 200 – High Level Sensor
7320 300 – Coagulation Dose
Sensor

ABB LIMITED
The Company
We are an established world force in the design and manufacture of instrumentation for
industrial process control, flow measurement, gas and liquid analysis and environmental
applications.
As a part of ABB, a world leader in process automation technology, we offer customers
application expertise, service and support worldwide.
We are committed to teamwork, high quality manufacturing, advanced technology and
unrivalled service and support.
The quality, accuracy and performance of the Company’s products result from over 100 years
experience, combined with a continuous program of innovative design and development to
incorporate the latest technology.
The NAMAS Calibration Laboratory No. 0255 is just one of the ten flow calibration plants
operated by the Company, and is indicative of ABB’s dedication to quality
and accuracy.
Use of Instructions
Warning.
An instruction that draws attention to the risk of injury or
death.
Caution.
An instruction that draws attention to the risk of damage to
the product, process or surroundings.
✶
Note.
Clarification of an instruction or additional information.
Information.
Further reference for more detailed information or
technical details.
Although Warning hazards are related to personal injury, and Caution hazards are associated with equipment or property damage,
it must be understood that operation of damaged equipment could, under certain operational conditions, result in degraded
process system performance leading to personal injury or death. Therefore, comply fully with all Warning and Caution notices.
Information in this manual is intended only to assist our customers in the efficient operation of our equipment. Use of this manual
for any other purpose is specifically prohibited and its contents are not to be reproduced in full or part without prior approval of the
Marketing Communications Department.
Health and Safety
To ensure that our products are safe and without risk to health, the following points must be noted:
1. The relevant sections of these instructions must be read carefully before proceeding.
2. Warning labels on containers and packages must be observed.
3. Installation, operation, maintenance and servicing must only be carried out by suitably trained personnel and in accordance with the
information given.
4. Normal safety precautions must be taken to avoid the possibility of an accident occurring when operating in conditions of high pressure
and/or temperature.
5. Chemicals must be stored away from heat, protected from temperature extremes and powders kept dry. Normal safe handling procedures
must be used.
6. When disposing of chemicals ensure that no two chemicals are mixed.
Safety advice concerning the use of the equipment described in this manual or any relevant hazard data sheets (where applicable) may be
obtained from the Company address on the back cover, together with servicing and spares information.
BS EN ISO 9001
Cert. No. Q5907
R
E
G
I
S
T
E
R
E
D
EN 29001 (ISO 9001)
Lenno, Italy – Cert. No. 9/90A
0255
Stonehouse, U.K.

1
CONTENTS
Section Page
1 INTRODUCTION .......................................................... 2
1.1 Introduction ........................................................ 2
1.2 Principle of Operation ....................................... 2
1.3 7320 Series Systems ........................................ 2
2 MECHANICAL INSTALLATION .................................. 3
2.1 Siting Requirements .......................................... 3
2.1.1 Monitor ................................................. 3
2.1.2 Flowcell Assembly ............................... 3
2.2 Installing the Monitor ......................................... 4
2.3 Installing the Flowcell ........................................ 5
2.4 Mounting the De-bubbler .................................. 7
2.4.1 Set Up Procedure for
Optional De-bubbler ............................ 7
3 ELECTRICAL CONNECTIONS ................................... 8
3.1 Access to Terminals .......................................... 8
3.2 Connections, General ....................................... 8
3.2.1 Relay Contact Protection and
Interference Suppression .................... 8
3.3 Monitor Connections ....................................... 10
3.3.1 Out of Sample Alarm
Input Connections .............................. 11
3.3.2 Alarm Relay Connections .................. 11
3.3.3 Out of Service Alarm .......................... 11
3.4 Selecting the Mains Voltage ............................ 11
3.5 Start Up ........................................................... 11
4 CONTROLS AND DISPLAYS .................................... 12
4.1 Displays ........................................................... 12
4.2 Switch Familiarisation ..................................... 12
Section Page
5 PROGRAMMING........................................................ 13
5.1 Programming Map ........................................... 13
5.2 Operating Display Page .................................. 14
5.3 Sensor Calibration ........................................... 15
5.4 Security Code .................................................. 15
5.5 Set Up Parameters .......................................... 16
5.6 Set Up Outputs ................................................ 17
5.7 Factory Settings .............................................. 17
6 MAINTENANCE ......................................................... 18
6.1 Standard Solutions .......................................... 18
6.1.1 Zero Standard .................................... 18
6.1.2 Span Standard ................................... 18
6.1.3 Calibration Checks ............................ 18
6.2 Scheduled Servicing ....................................... 18
6.2.1 Cleaning the Flowcell ........................ 18
6.2.2 Dismantling the Flowcell for
Cleaning and Wiper Maintenance .....19
6.3 Unscheduled Servicing ................................... 23
6.3.1 Monitor Diagnostic Information ......... 23
6.3.2 Unstable or Erratic Readings ............ 23
6.4 Replacing the Emitter and
Receiver Modules ........................................... 24
6.4.1 Changing the Modules....................... 24
6.4.2 Adjusting the Emitter Brightness ....... 24
7 SPECIFICATION ........................................................ 27
8 SPARES ..................................................................... 28
APPENDIX........................................................................... 29
A.1 Inferred Units ................................................... 29

2
7320 100 7320 000
7320 0007320 200
Low Range System
High Range System
7320 0007320 300
Coagulation Dose System
1 INTRODUCTION
Fig. 1.1 System Arrangements
1.1 Introduction
Warning. This instrument uses a high intensity
light source which emits ultraviolet (UV) radiation and
must NOT be viewed with the naked eye. Under normal
operating conditions it is not possible to see the light
source, but if the sensor is dismantled with the power
applied, it may be possible to expose the eyes to the
strobe flash.
Many dissolved organic compounds (DOC) commonly found
in potable water strongly absorbs ultraviolet radiation. These
include Humic Acid, which gives water a characteristic yellow
and dissolved organics with results in the formation of
Trihalomethanes (THMs).
The monitor is used as a surrogate colour monitor, monitor and
control coagulation, and to monitor THM precursors in potable
water treatment plants.
1.2 Principle of Operation
The monitor employs a broad-spectrum xenon strobe lamp to
generate pulses of light which pass through the sample water
in the flowcell to a filtering and detection system. The received
light pulses are analysed at two wavelengths: the
measurement wavelength of 254 nm and the reference
wavelength of 400 nm, at which the sample constituents of
interest do not absorb. This dual light path system provides
information which allows the measured value to be corrected
for any turbidity due to suspended matter in the sample. The
monitor is calibrated with a pure solution of a suitable organic
compound of known carbon content.
An automatic, microprocessor-controlled, dual-wiper system
cleans the flowcell optical windows periodically to ensure that
the cell remains functional. Samples containing large solids
and/or very high concentrations of solids must be pre-filtered.
1.3 7320 Series Systems – Fig. 1.1
• The 7320/1000 low range analyzer primarily for use in
potable water applications, such as monitoring the
effectiveness of the coagulation control, THM precursor
detection and final treated water quality.
Range: 0 to 20 mgl-1 C maximum.
• The 7320/2000 high range analyzer is used for intake
protection applications on potable water applications to
detect the rise in DOC from algal bloom toxins and
industrial discharges.
Range: 0 to 100 mgl-1 C maximum.
• The 7320/3000 high range coagulation analyzer is
designed to monitor the raw water in potable water
treatment plants to predict the coagulant dose.
Range: 0 to 100 mgl-1 C maximum.

3
IP65
C – Within Environmental Limits
50 °C maximum
0 °C minimum
B – Within Temperature Limits
Maximum = 750 mm
Minimum = 200 mm
A – Distance between Instrument & Flowcell
2 MECHANICAL INSTALLATION
Caution. Do not damage the equipment by
dropping, scraping or otherwise abusing it during the
installation process. Although the equipment is ruggedly
constructed, it contains precision optical components
which may be damaged if subjected to impacts or shock
loading.
2.1 Siting Requirements – Fig. 2.1
2.1.1 Monitor
Caution.
• Mount in a location free from excessive vibration.
• Mount away from harmful vapors and dripping fluids.
The monitor must be fixed to a wall or support in such a
position as to make reading the displays and operating the
keypad convenient. It is advisable to install a suitably switched
and fused isolating box to the right of the monitor, in a position
which allows the power to be switched on or off while standing
in front of the display.
2.1.2 Flowcell Assembly
The flowcell assembly is supplied on mounting brackets.
These must be fixed to a suitable vertical surface such that
convenient servicing and calibration is afforded. Allow suitable
space to the left and right of the unit for accessing the sensors.
Notes.
• For ease of use it is recommended that the flowcell be
mounted at chest height.
• The bracket fitted to the emitter module on a high
range flowcell is in two parts – see Fig. 2.5.
Fig. 2.1 Siting Requirements

4
403 (15.9)
453 (17.8)
227 (8.9)
434 (17.1)
Dimensions in mm (in.)
150 (5.9)
5 (0.2) 133 (5.2)
4 x ø9.5 (
3/8
) holes
for M8 fixing
Fixing Centers
Fixing Centers
252 (9.9)
Mark-out the fixing centers of the
four mounting holes – see Fig. 2.2.
Fix the instrument
securely to the wall.
Drill suitable holes for the type
of fixings to be used.
12
3
2.2 Installing the Monitor – Figs. 2.2 and 2.3
Fig. 2.2 Overall Dimensions
Fig. 2.3 Monitor Fixing Details
…2 MECHANICAL INSTALLATION

5
For maintenance purposes the following minimum clearances are recommended:
Left (for receiver removal) 100 mm
Right (for emitter removal 100 mm
Top (for cleaner removal) 200 mm
Four holes ∅6
for mounting
Sample inlet
(12 mm i.d. flexible
hose connection).
Drain
(12 mm i.d. flexible
hose connection).
Sample outlet,
see Fig. 2.7
for location.
Sample Outlet
Connector
for 6 mm i.d.
Tube Located
Behind the
Sensor Body
Cleaner
Receiver
Emitter
410
327
155 CRS
118
Dimensions in mm
2.3 Installing the Flowcell – Figs. 2.4 and 2.5
Notes.
• Connecting pipework may be flexible plastic or rigid PVC, polypropylene or metal depending on the installation.
• Isolating valves should be fitted to allow removal of the instrument.
• Space should be left on each side of the assembly to allow access to the sensors.
Fig. 2.4 Overall Dimensions and Mounting Details of 7320 100 (Low Range Sensor)
2 MECHANICAL INSTALLATION…

6
405
EmitterReceiver
Cleaner
Standard Solution
Filler
Mounting Bracket
(4 holes O6)
Sample Outlet
(for 8 mm i.d. Tube)
155 CRS
162 CRS
Drain
(12 mm i.d. flexible
hose connection)
.
Sample Inlet
(12 mm i.d. flexible
hose connection)
.
Note. The emitter end mounting bracket is in
two parts to facilitate emitter module removal during
maintenance. See Section 6 - Maintenance .
Fix to Wall
Bracket Fixed to
Flowcell Cover,
Emitter side
For maintenance purposes the following minimum
clearances are recommended:
Left (for receiver removal) 150 mm
Right (for emitter removal 100 mm
Top (for filling with standard solution) 200 mm
110
162
373
Dimensions in mm
…2 MECHANICAL INSTALLATION
Fig. 2.5 Overall Dimensions and Mounting Details of 7320 200 and 7320 300 (High Range Sensors)

7
De-bubbler
Part Number
7997 500
91
150 CRS
Removable Fitting
To Fit 12 mm i.d. Tube
88
Ø6.5
Sample Outlet
Quick-release
Fittings
to Suit 12 mm
I.D. Tube
(rotatable
through 360°)
540
Sample Inlet
Drain Outlet
Important Note.
The de-bubbler MUST
be mounted vertically
with the flow upwards.
Dimensions in mm
Tundish
Valve (A)
= Optional
Minimise height
to avoid syphoning
effect
Important Note. For the high range sensor a higher
minimum flowrate is required at high turbidity levels.
12
Valve (B)
Flow Regulator Valve
Adjust the sample flow through the system
(0.5 to 5 l/min) using the regulating valve (B).
Open the ‘sample in’ isolating valve (A)
such that the overflow from the de-
bubbler is at a minimum.
Note. Sample regulating
valves together with a flow indicator
are recommended to ensure easy
maintenance and consistent
performance. These devices are
not supplied with the 7320 Series
UV Organic Pollution Monitoring
system.
Important Note.
The de-bubbler MUST be
mounted vertically with the flow
upwards.
Tundish
Minimise height
to avoid syphoning
effect
Sample Outlet
Connector
Sample in
Flow Regulator
Valve
De-bubbler
Drain
Outlet
7320 100
7320 000
2 MECHANICAL INSTALLATION
Fig. 2.6 Overall Dimensions and Mounting Details of the De-bubbler
Fig. 2.7 Typical System Installation
2.4 Mounting the De-bubbler – Fig. 2.6
2.4.1 Set Up Procedure for Optional De-bubbler – Fig. 2.7

8
Release the lower panel and remove
from the front of the instrument.
1
3 ELECTRICAL CONNECTIONS
3.2 Connections, General
Warning. The power supply earth (ground) must
be connected to ensure safety to personnel, reduction of
the effects of RFI and correct operation of the power
supply interference filter.
Information.
•Earthing (grounding) – stud terminal(s) is fitted to the
transmitter case for bus-bar earth (ground) connection
– see Fig. 3.3.
•Cable routing – always route the signal cable and
mains-carrying/relay cables separately, ideally in
earthed (grounded) metal conduit.
Ensure that the cables enter the transmitter through
the glands nearest the appropriate screw terminals
and are short and direct. Do not tuck excess cable into
the terminal compartment.
•Cable glands & conduit fittings – ensure a moisture-
tight fit when using cable glands, conduit fittings and
blanking plugs/bungs (M20 holes). The M16 glands
ready-fitted to wall-mounted instruments accept cable
of between 4 and 7 mm diameter.
Fig. 3.1 Access to the Terminal Block
Fig. 3.2 Relay Contact Protection
NC C NO
External
D.C. Supply
+–
Relay Contacts
Load
Diode
NC C NO
External
A.C. Supply
LN
Relay Contacts
C
R
Load
A – A.C. Applications
B – D.C. Applications
Warning.
• Although certain instruments are fitted with internal fuse protection, a suitably rated external protection device, e.g. fuse
or miniature circuit breaker (MCB), must also be fitted by the installer.
• Before making any connections, ensure that the power supply, any high voltage-operated control circuits and high
common mode voltage are switched off.
3.1 Access to Terminals – Fig. 3.1
Information.
•Relays –the relay contacts are voltage-free and must
be appropriately connected in series with the power
supply and the alarm/control device which they are to
actuate. Ensure that the contact rating is not
exceeded. Refer also to Section 3.2.1 for relay contact
protection details when the relays are to be used for
switching loads.
•Current output – Do not exceed the maximum load
specification for the selected current retransmission
range – see SPECIFICATION, Section 7.
Since the current output is isolated the –ve terminal
must be connected to earth (ground) if connecting to
the isolated input of another device.
3.2.1 Relay Contact Protection and Interference
Suppression – Fig. 3.2
If the relays are used to switch loads on and off, the relay
contacts can become eroded due to arcing. Arcing also
generates radio frequency interference (RFI) which can result
in instrument malfunction and incorrect readings. To minimize
the effects of RFI, arc suppression components are required;
resistor/capacitor networks for AC applications or diodes for
DC applications. These components can be connected either
across the load or directly across the relay contacts. On 7320
instruments the RFI components must be fitted to the relay
terminal block along with the supply and load wires – see
Fig. 3.2.