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.

9
For AC applications the value of the resistor/capacitor network depends on the load current and inductance that is switched.
Initially, fit a 100R/0.022 µF RC suppressor unit (part no. B9303) as shown in Fig. 3.2A. If the instrument malfunctions (incorrect
readings) or resets (display shows 88888) the value of the RC network is too low for suppression – an alternative value must be
used. If the correct value cannot be obtained, contact the manufacturer of the switched device for details on the RC unit required.
For DC applications fit a diode as shown in Fig. 3.2B. For general applications use an IN5406 type ( 600V peak inverse voltage
at 3A – part no. B7363).
✶
Note. For reliable switching the minimum voltage must be greater than 12V and the minimum current greater than
100 mA.
3 ELECTRICAL CONNECTIONS…

10
Incoming
Power Supplies
Earth Stud
9 101112 13141516 17
1234 5678 NU N E
L
NU NU NU
Receiver
Yellow
Green
Blue
Red
Red
Green
Red
Blue
Green
Emitter
+_
Current
Output
External
Out of
Sample
Input
Contacts
Out of
Service
Relay
Contacts
Cleaner
Blue
Red
Green
Two
Wires
Three
Wires
Fuse No. 5 in cover holder
(see Fig.3.4 for details)
Cleaner
Receiver
Emitter
(2 wires)
Emitter
(3 Wires)
Example Sensor (Low Range)
A1
N/O N/C
COM
A2
N/O N/C
COM
= Optional
Wiring to Alarm Devices
…3 ELECTRICAL CONNECTIONS
Fig. 3.3 Monitor Connections – All Sensors
3.3 Monitor Connections – Fig. 3.3
✶
Note. Refer to Fig. 3.1 for Access to Terminals.
Caution. Slacken terminal screws fully before
making connections.
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.
lanimreTsliateDnoitcennoC
1tupnilangisVU
2tupnilangisecnerefeR
3V0revieceR
4ylppusV21revieceR
5reggirtev+rettimE
6reggirtev–rettimE
7ylppusV42rettimE
8V0rettimE
htraEhtraerettimE
51V0renaelC
61ylppusV21renaelC
71eslupmietaitinirenaelC
UNdesUtoN

11
Unlock and carefully remove the upper
enclosure cover.
Replace and lock secure the upper enclosure cover
Offer the cover up to the enclosure and reconnect the
ribbon cable
1
4
5
240 V
110 V 110 V
Disconnect the front panel ribbon
cable at the main p.c.b. end.
Identify the mains tappings on the 2
p.c.b's and select the required mains
voltage using the links supplied.
Note. For 110 V both 110 V
tappings on each board MUST be
linked. Spare links for this purpose
are packed with the spare fuse.
Caution. Support the cover during the
unlocking procedure to prevent it falling and
possibly damaging the ribbon cable and/or p.c.b.
Handbag link
3
2
Fuses
No. Function Rating
1 Mains in 500 mA
2 24 V out 1 A
3 Mains in 500 mA
4 12 V out 1 A
5 Mains in 500 mA
1
2
3
4
Fuse no. 5 (see Fig. 3.3)
The cover may be
supported using the
earth cable.
3 ELECTRICAL CONNECTIONS
3.3.3 Out of Service Alarm
This alarm can be remotely transmitted via an internal relay
provided. This is a fail-safe relay which is de-energised in the
event of a diagnostics alarm – see Section 6.3.1 for details.
3.4 Selecting the Mains Voltage –Fig. 3.4
3.5 Start Up
When all sample/drain connections have been made and
electrical/signalling installation has been completed and
checked, switch on the power supply.
Proceed to Section 5 for programming details.
Fig. 3.4 Selecting the Mains Voltage
3.3.1 Out of Sample Alarm Input Connections
A digital input is supplied which can be connected to a low flow
indicator or sump level switch. This can be used to give
indication of the loss of the sample flow or an unacceptable
drop in water level. The input is linked to the internal system
relay when selected in the program.
The input can be configured in the software to accept an input
from a device which has normally open or closed contacts –
see Section 5.5.
If this input is not required, leave it open circuit.
3.3.2 Alarm Relay Connections
Up to two alarm relays can be provided with connections to the
single set of contacts for each alarm – see Fig. 3.3. Alarms can
be connected using suitable signal cable.
The operating sense of the relays can be changed using the
service programs – see Section 5.6, Set Up Outputs. This
enables normally open or normally closed configurations.

12
15.1
Diss. Organics
mg/l
Program Parameters
(alphanumeric display)
Membrane Switches
Current Reading of Dissolved Organics
Concentration (numeric display)
A –Advancing to Next Page
Parameter 1
Parameter 2
Parameter 3
Parameter 4
Page 1
Parameter 1
Parameter 2
Parameter 3
Page 2
Advance to
next page
For majority
of parameters
or
B –Moving Between Parameters
C –Adjusting and Storing a Parameter Value
New value is
automatically stored
Parameter Value Adjust
D –Selecting and Storing a Parameter Choice
Parameter X
Y
Z
Select
Parameter 1
Parameter 2
Parameter 3
Page X
Parameter 4
Advance to
next parameter
or
New value is
automatically stored
or
4 CONTROLS AND DISPLAYS
Fig. 4.1 Location of Controls and Displays
Fig. 4.2 Functions of the Membrane Switches
4.1 Displays –Fig. 4.1
The upper display window comprises a 4-digit, 7-segment
digital line and shows actual values (Concentration) of
dissolved organics. The lower display comprises two 16-
character dot-matrix lines showing the current progam
parameters.
4.2 Switch Familiarisation –Figs 4.1 and 4.2

13
Diss. Organics
mg/l
Sensor Calibrate
Cal. User Code
0000
Security Code
0000
Set Up Parameter Set Up Outputs Factory Settings
Factory Set Code
0000
Operating Display
Page
Alarm 1 Setpoint
1.5 mg/l C
Alarm Setpoint
8.6 mg/l C
Yes
Lamp Disabled
No
Manual Clean
No
Yes
Fill Zero Sol.
Calibrating Zero
Fill Span Sol.
40.0 mg/l C
Calibrating Span
Cal. Complete
Sensor Type
73 0 100
73 0 00
73 0 300
Damping Value
5
Inferred Units Diss. Organics
Clean Int.
60 min
Flow Alarm
Off
Normally Closed
Normally Open
Alter Sec. Code
0000
Alter Cal. Code
0000
Absorbance/Metre
Colour °H
Coag. Dose mg/l
mg/l T.O.C.
Conversion Factor
.00
Current o/p Span
10.00 mg/l C
Default Output
8.00 mg/l C
0-10 0- 0
Current o/p Type
4 to 0 mA
Test Current O/P
5.00 mg/l C
A1 Action
Off
Low High
A1 Setpoint
1.50 mg/l C
A Action
Off
Low
High
A Setpoint
.50 mg/l C
5 PROGRAMMING
Fig. 5.1 Overall Programming Chart
5.1 Programming Map –Fig. 5.1

14
°H
D. Org 8.5 mg/l C
or
Diss. Organics
mg/l
Alarm 1 Setpoint
1.5 mg/l
Alarm Setpoint
8.6 mg/l
Manual Clean
No
Yes
Lamp Disabled
No
Sensor
Calibration
Yes
…5 PROGRAMMING
5.2 Operating Display Page
Note. This is the default page. The programme returns to this point from any of the programming pages if no data has
been entered after four minutes.
Dissolved Organics Mode Operating Page
Display in inferred units (see Appendix)
Absorbance/metre; colour °H; Coag. Dose mgl–1; mgl–1 T.O.C.
Equivalent value in mgl–1 Dissolved Organics.
This is for display only. See Set Up Outputs Page for programming details.
This is for display only. See Set Up Outputs Page for programming details.
Switching the Lamp On/Off
In the interests of safety it is essential that the lamp is switched off before
doing any maintenance on the sensor. When off, Lamp Disabled is
displayed in the lower window of the Diss. Organics page; the top
window will be blank.
Press the switch to disable the lamp and to switch the lamp back on.
Manual Cleaning
Press the switch to change No to Yes and press the switch to start
a manual clean.
Return to top of Operating Display Page.

15
Security Code
0000
Set Up
Parameter
Sensor
Calibrate
Sensor Calibrate
Cal. User Code
0000
Fill Zero Sol.
Calibrating Zero
Fill Span Sol.
40.00 mg/l C
Security
Code
Calibrating Span
Cal. Complete
Diss.
Organics
5 PROGRAMMING…
5.3 Sensor Calibration
Secure Parameter Access
Use the and switches to enter the appropriate security code
between 0000 and 9999.
Advance to Set Up Parameter Page.
Note. Output is held during a calibration.
Note. The calibration pages have a 60 minute timeout after which the
instrument reverts to normal operation.
Sensor Calibration Page
Calibration Access Code
Enter the code in the range 0000 to 9999.
Fill the flowcell with carbon-free de-ionized water.
This message is displayed for about one minute, then changes to Fill
Span Sol..
Fill the flowcell with the required calibration solution.
7320 100 (low range)............... 10.00 mgl–1C
7320 200 (high range) ............. 40.0 mgl–1C
7320 300 (coagulation dose) ... 40.0 mgl–1C
This message is displayed for about one minute, then changes to Cal.
Complete.
Return to top of Sensor Calibration Page.
5.4 Security Code

16
Set Up Parameter
Sensor Type
73 0 100
Damping Value
5
Conversion Fac.
.00
Clean Int.
60 min
Set Up
Outputs
Flow Alarm
Off
Alter Sec. Code
0000
Security
Code
Alter Cal. Code
0000
73 0 00
Normally Closed
Normally Open
73 0 300
Inferred Units
Diss. Organics
Absorbance/metre
Colour °H
Coag. Dose mg/l
mg/l T.O.C.
…5 PROGRAMMING
Set Up Parameters Page
Select the appropriate sensor:
7320 100 = Low Range Sensor.
7320 200 = High Range Sensor.
7320 300 = Coagulation Dose Sensor.
When changed Please Wait is displayed for 20 seconds.
Enter a damping value in the range 1 to 20.
This is used to prevent short term variations in reading, typically due to
bubbles in the sample. Always use the lowest value which gives an
acceptably stable reading.
Dissolved Organics mode
Inferred Units mode
See Appendix.
Enter the conversion factor between Dissolved Organics and the Inferred
Unit selection.
Note. Absorbance/metre has a fixed factor of 1.5.
Cleaning Interval
Enter required interval between automatic cleaning procedures.
Options: 15, 30, 45 & 60 minutes. 2, 4, 6, 12 & 24 hours.
Flow Alarm Input Configuration
Set the normal 'none' alarm condition (normally open or closed), or disable
by setting to Off.
Alter Set Up Parameter Security Code
Enter value in the range 0000 to 9999.
Alter Calibration Security Code
Enter value in the range 0000 to 9999.
Return to top of Set Up Parameters Page.
5.5 Set Up Parameters

17
Set Up Outputs
Current o/p Span
10.00 mg/l C
Test Current o/p
0.00 mg/l C
A1 Action
Off
Factory
Settings
A1 Setpoint
1.50 mg/l C
A Action
Off
Set Up
Parameter
A Setpoint
.50 mg/l C
0 - 10
Current o/p Type
4 to 0 mA
0 - 0
Low
High
Low
High
Default Output
8.00 mg/l C
Factory Settings
Factory Set Code
0000
Diss. Organics
page
Set Up
Outputs
5 PROGRAMMING
These parameters are set at the factory and will not normally require
adjustment on site. However, if the receiver/emitter modules have been
changed then the emitter light will need setting. The full Factory Settings
page is given in Section 6.4.
5.6 Set Up Outputs
5.7 Factory Settings
Set Up Outputs Page
Set the current output span between the following limits:
Low range sensor: 0 to 2 and 0 to 20 mgl–1C
High range sensor: 0 to 20 and 0 to 100 mgl–1C
Set the current output to a default in the event of a diagnostic alarm.
Select the current output:
4 to 20mA
0 to 20mA
0 to 10mA
Set the value within the current o/p span.
The instrument automatically transmits a test signal to represent the current
output range.
Alarm 1 Action
This can be set as a high or low alarm contact.
Select High or Low as appropriate.
Select Off to disable this alarm.
Adjust setpoint to a value within the range of the sensor.
Alarm 2 Action
This can be set as a high or low alarm contact.
Select High or Low as appropriate.
Select Off to disable this alarm.
Adjust setpoint to a value within the range of the sensor.
Return to top of Set Up Outputs Page.

18
6.1 Standard Solutions
Because UV absorption is a non-specific, aggregate
measurement of organic carbon concentration, true standards
are not available. In this situation it is convenient to use a
standard solution made from a single known organic
compound. The monitor then produces readings in units of
mg/l of carbon defined against the calibration standard.
Potassium hydrogen phthalate is the recommended standard
but other suitably pure, soluble and stable organic compounds
could be used instead. If, as is to be expected, an alternative
standard solution absorbs more or less strongly at 254 nm
than the recommended solution, then different monitor
readings will be obtained on a given sample.
The monitor does not require frequent calibration but, when
calibrating, particular care must be taken to avoid
contamination of standard solutions, particularly the zero
standard, with organic material which may be present inside
the flowcell.
6.1.1 Zero Standard
Calibration is performed using carbon-free de-ionized water.
The practicality of obtaining water which is truly carbon-free is
questionable so, as zero is the more important calibration
point, it is necessary to use the best quality water available
and to ensure that it is not subsequently contaminated by
organic matter. In some cases distilled water, while less
chemically pure, may contain less organic carbon than de-
ionized water.
The zero standard solution should be as fresh as possible but,
if storage is unavoidable, a glass container should be used to
avoid possible contamination due to leaching of chemicals
from a plastic bottle.
6.1.2 Span Standard
Prepared from potassium hydrogen phthalate
(KOOC.C6H4.COOH, carbon content = 47.05 %), Analytical
Reagent grade, and high quality de-ionized or distilled water.
To prepare a 1000 mgl–1C carbon stock standard solution:
dissolve 2.125 (± 0.005) g of potassium hydrogen phthalate,
previously dried at 120 °C for 2 hours, in about 500 ml de-
ionized water and make up to 1 litre in a volumetric flask. This
solution may be stored in a glass bottle in a refrigerator,
without freezing, for up to 3 months.
Working standard solutions for monitor calibration should be
freshly prepared from the stock standard when required. Dilute
the stock solution with high quality de-ionized or distilled
water; the standard solution should be discarded after use.
Low Range, 10 mgl-1C:
Dilute 10 ml of the stock standard solution to 1 litre in a
volumetric flask.
High Range, 40 mgl-1C:
Dilute 40 ml of the stock standard solution to 1 litre in a
volumetric flask.
6.1.3 Calibration Checks
The system uses an optical system with very stable electronics
which avoids the risk of electronic drift. Therefore, routine
calibration is normally unnecessary. However, it may be
necessary to routinely check the system accuracy (particularly
after cleaning). The should then be considered as a calibration
check and not a calibration adjustment.
The calibration check can be simply carried out by filling the
flowcell with the Zero and Span Standards and observing the
readings on the Operating Display Page.
The solutions are poured in from the top of the flowcell.
High Range Sensors:
Remove filler plug on top of the flowcell and use the funnel
provided.
Low Range Sensor:
Remove the Cleaner Module, fill flowcell and fit Cleaner
Module.
6.2 Scheduled Servicing
Warning. Do NOT open the emitter unit as it uses
high voltages which could cause serious injury or death.
Caution. Both emitter and receiver units contain
no user serviceable parts and are sealed in clean air
conditions at the factory. Opening them could lead to
degraded performance. See also the warning above.
The following servicing schedule has been produced as a
general guide only. Because the systems are designed for a
wide range of applications, where the nature of the sample can
vary considerably, it may be necessary to amend the schedule
to suit the particular installation and sample conditions.
6.2.1 Cleaning the Flowcell
The required automatic cleaning frequency of the flow
chamber and optical windows can only be determined by plant
experience. It is recommended that checks are made are
appropriate intervals.
Routine servicing is limited to manually cleaning out the
flowcell to remove any fouling or sediment which has
accumulated over a lengthy period. In particular, if there is a
need to calibrate the instrument it is important that no
contamination occurs when setting the zero condition. To
clean out the high range sensor the cell it must be 'split'. Four
stainless steel screws hold it together, but two of them provide
a jacking action when unscrewed, thus affording a controlled
splitting operation. See Section 6.2.3, Fig. 6.2, for details.
6 MAINTENANCE