IOTRONIC AQUACON PH-CL User manual

May 2011
Fillerkampsweg 1 – 5 •31832 Springe OT Eldagsen •Tel.: [phone] (Fax: -99)
E-Mail: [email protected] Internet: http://www.iotronic.de
Operating Manual
Process photometer
for free chlorine and pH value
AQUACON PH-CL
(PC- Cabinet)

AQUACON PH-CL (PC Cabinet)
Technical Information
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May 2011

AQUACON PH-CL (PC Cabinet)
Technical Information
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May 2011
1 GENERAL GUIDELINES FOR SAFETY 3
2 PRINCIPLE OF OPERATION 4
3 DESCRIPTION OF THE PROCESS PHOTOMETER 4
3.1 Analytical Part 7
3.2 Measurement and Control 7
3.3 Operation and Measurement Security 8
3.4 Automatic Operation 9
3.5 Manual Operation 10
3.6 Display/Set Parameters 11
3.6.1 Limit Value 1 pH 12
3.6.2 Limit Value 2 pH 12
3.6.3 Limit Function pH 13
3.6.4 Limit Value 1 Cl2 13
3.6.5 Limit Value 2 Cl2 13
3.6.6 Limit Function Cl2 13
3.6.7 Sampling Intervall 13
3.6.8 Titer/Calibration factor 14
3.6.9 Rinsing time 14
3.6.10 Reagent Volume 14
3.6.11 Analog Output setting (mode) 14
4 SWITCHING FUNCTIONS OF THE AQUACON PH-CL 15
4.1 External Switching 15
4.2 Display in the standby mode 15
4.3 Analysis state relay 15
4.4 Limit Value Relay K2 and K3 16
4.5 Alarm Limit Relay 16

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4.6 Current Output 16
5 START-UP AND MAINTENANCE INSTRUCTIONS 17
5.1 Connection of sample water 17
5.2 Connection of reagent, bleeding of pumps and tubes 17
5.3 Replenishment of Reagent 17
5.4 Changing of Tube box 18
5.5 Recalibration of the Process analyzer 18
5.6 Maintenance interval 18
5.7 Shut down procedure 18
6 ALARM MESSAGES 19
7 TECHNICAL DATA 19
8 SPECIFICATIONS 20
9 CONNECTION DIAGRAM 20
9.1 Set 0/4 - 20 mA-Output 20
9.2 Connections 21
9.3 Installation 22
10 APPENDIX 23
10.1 Analysis cycle AQUACON PH-CL 23
10.2 Spare part and consumable item list 24
11 TROUBLESHOOTING GUIDE 25

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1 General Guidelines for Safety
WARNING (Non-observance or misapplication of the contents
of the “Warning” section could lead to serious
accident, including death or injury)
Turn off the power supply.
Working without disconnecting the power supply may cause an electrical
shock. Before engaging upon any working procedures make sure to
disconnect the power supply.
No remodelling !
Never remodel an analyzer. Otherwise, a serious accident may result.
IOTRONIC will not be responsible for any accident or damage of any kind
which is caused by the user remodelling the analyzer.
Operating site must be free of water and humidity
The analytical instrument is not designed to be water-proof or dust-proof.
The use of the analyzer in places where water splashes or humidity is high
may result in an electrical shock or short-circuit.
CAUTION !
(Non-observance or misapplication of the
contents of the “Caution” section could lead to
serious physical injury to the user or serious
damage to the product.)
Specified power only
Do not operate the analyzer on voltage which is not specified on the label
on the right side of the transmitter housing. Failure to do so can result in
damage or fire. Only the specified power level is to be applied.
Do not damage or change power cable !
Do not scratch, damage, process, or pull the power cable forcibly. Non-
observance could cause a fire or an electrical shock.
Notes on operation
zDropping the device or subjecting it to strong impacts may result in
faulty performance. Handle the analyzer with care.
zSelect an installation site convenient for future maintenance and
inspection, and fix the device carefully so that it is free of vibrations.

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2 Principle of Operation
The process photometer AQUACON PH-CL performs a discontinuous photometric determination of
the concentration of free chlorine and of the pH value. The measurements are performed one after the
other. The entire operation, which includes filling and rinsing of the measuring cuvette, is controlled
by a microprocessor.
PH value:
A special indicator reagent is added via a peristaltic pump and mixed with the water sample in the
measuring chamber. The color formed as a result of the reaction is detected by the monochromatic
photometric detection system built into the measuring chamber. The measured absorbance is a
function of the pH value.
Free chlorine:
A special developed reagent based on N-N-Diethyl-p-phenylendiaminsulfat (DPD) and a buffering
solution are added via a peristaltic pump and mixed with the water sample in the measuring chamber.
The color formed as a result of the reaction is detected by the monochromatic photometric detection
system built into the measuring chamber. The measured absorbance is a function of the free chlorine
concentration. With this method, the concentration of free chlorine (Cl2), hypochlorous (HOCl),
hypochlorite (OCl-) is measured.
The measurement results for pH value and free chlorine concentration are displayed on the
touchscreen.
3 Description of the Process Photometer
The process photometer is delivered completely mounted in a polycarbonate wall cabinet, ready for
installation. This includes all the components for sample and drain connection, measurement chamber,
reagent pumps, display and connections for remote display and control. All functions of the process
photometer can be operated via touchscreen.

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Sample
inlet
Sample
outlet
700
300
1
2
3
4
8
9
5
6
7
Automatic Operation
Manual Operation
Mode is selected for the following
drives by pressing the appropiate
key i n t he to p r ow
Rea gent pum p 1+ 2 o n/ off
Reagent pump 3 on/off
Sample Inlet valve open/close
Stirrer on/off
Mode isselected
and contents of parameter 3 to -
are viewed sequentially by
repeated pre ssing of this key
Alters contents of displayed
parameter
1+2 3
Return to AUTOMATIC mode
View/Change Parameters
Standby
Analy zing
Manual
0
1
2
Limit value
Alarm v alue
AQUACON FE10
Calibration factor
Reagent volume (ml)
Rinse t ime (sec)
Sam pli ng int er va l ( mi n)
Start va lue for 2 0 mA Output
End value for 20 mA Output
Photometer error /Loss
of sample
Overrange
Reagent depleted
Remote operation activated
Reagent volume < 50 ml
E - 1
E - 2
E - 3
E - 4
H - E
Error Messages
3
4
5
6
7
8
9
-
Display / Set Parameters:
Operating Mode /
Parameter
OPERATING MODE /
PARAMETER DISPLAY
Operating Mode:
ppb
View of the process photometer AQUACON PH-CL
1 Transmitter
2 Measuring chamber
3 Sample inlet valve
4,5,6 Reagent tube pump
7Reagent 1 vessel (500 ml)
8Reagent 2 vessel (250 ml)
9Reagent 3 vessel (250 ml)
600

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AQUACON PH-CL Display and Keyboard
Explanation of Symbols
Symbol Function
Select Automatic Mode, start an analysis
Reagent pump 1 on/off
Reagent pump 2 on/off
Reagent pump 3 on/off
Sample inlet valve open/close
Stirrer on/off
View / Change parameters

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3.1 Analytical Part
The transmitter of the process photometer AQUACON PH-CL is contained in a compact housing and
includes the microprocessor which recognizes the absorbance (extinction), displays the final
calculated result on a touch screen and controls the operation of the process photometer with respect
to sampling, rinsing of the measurement chamber, dosing of the reagent and surveillance of the
photodetection system.
3.2 Measurement and Control
Inside the control unit of the analyzer, there is one limit value relay (K2) for the pH value and one
limit value relay (K3) for the free chlorine. Both relays can be operated in min function mode or in
max function mode. For both relay, 2 limit values (limit value 1 and limit value 2) can be
parametrized.
Min function:
If the limit function of the relay K2 or K3 is set as min function, the appropriate relay will be activated
if the measured value is lower than the set limit value 1 for this relay. The relay will be deactivated if
the measured value is higher than the set limit value 2 for this relay.
Max function:
If the limit function of the relay K2 or K3 is set as max function, the appropriate relay will be
activated if the measured value is higher than the set limit value 2 for this relay. The relay will be
deactivated if the measured value is lower than the set limit value 1 for this relay.
In addition, two 0/4 - 20 mA current outputs deliver a signal which is proportional to the measured
values for pH and free chlorine (see chapter 9.1). The start value and the end value of the output range
are fixed for both parameters .
All user-defined settings are maintained during power failure to the instrument.

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3.3 Operation and Measurement Security
When the end-user defined maximum alarm value is exceeded or when an error occurs (ERROR E-1
to ERROR E-4) the alarm relay will activate.
The actual reagent volume of reagent 1 is calculated by the microprocessor and is corrected for usage
after each analysis. Once the calculated remaining reagent volume falls below the factory-
predetermined value of 50 ml, an alarm message (ERROR E-3) is displayed on the touchscreen and
the alarm relay (found on the transmitter terminal connector) is activated. The remaining 50 ml
reagent is sufficient for appr. 92 analysis. Should this alarm be ignored and the reagent is depleted, a
second alarm message (ERROR E-4) is displayed on the touchscreen, subsequent relay activation is
initiated by the process photometer AQUACON PH-CL and the analyzer stops.
The optical transparency of the measurement cuvette is measured at the start of each analysis. An
automatic zero adjustment takes place before each measurement to compensate colored or turbid
samples or discoloration/contamination of the cuvette windows.
Once the factory-predetermined limit to the zero adjustment is exceeded, another alarm message
(ERROR E-1) is displayed on the touchscreen, the alarm relay is activated and the analysis cycle is
interrupted. In the event of sample failure, the photometer will detect this and display the alarm
message ERROR E-1 on the touchscreen, activate the alarm relay and interrupt the measurement.
When the sample interval defined by the end-user has elapsed, the process photometer will
automatically resume measurement as normal and repeat the procedure until sample flow is re-
established.
The analysis cycle may be interrupted at any stage by touching the button ”Hand” or the button
”Param” on the touchscreen. The process photometer remains in manual operation mode until the
automatic mode is selected by pressing the appropriate symbol or touch button.