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USF Wallace & Tiernan DEPOLOX 4 Manual

Residual analyzer
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Summary of Contents for USF Wallace & Tiernan DEPOLOX 4

  • Page 2 SALES ORDER NO. VA ..... NOTE: The equipment has been made of first-class material and should perform satisfactorily if properly operated and maintained. It is therefore most important that the instructions be read, and understood, prior to installation, operation or maintenance. Our guarantee is conditional upon the equipment being treated in accordance with this instruction.
  • Page 3 GUARANTEE For a period of one year after shipment, we undertake to repair or replace free of charge, f.o.b. Günzburg, all equipment or parts of our supply that have failed due to defects in workmanship or material, provided that these parts have been used under normal operating conditions.

  • Page 4: Table Of Contents

    12-13 Sample water take-off Sample water drainage STARTUP Depolox 4 analyzer (pressureless type) Depolox 4 analyzer (pressure type max. 1.5 bar) Amplifier for chlorine measuring cell DEPOLOX 4 15-16 CALIBRATION OF THE DEPOLOX 4 AMPLIFIER Calibration of range Calibration of bias voltage...
  • Page 5 PAGE TROUBLESHOOTING pH-VALUE ANALYSER pH probe with special cable Startup of ph-value analyser 23-24 Maintenance of ph probe pH-measurement using the phenol red method Spare parts and chemicals for maintenance REDOX ANALYSER 10.1 Redox probe with special cable 10.2 Start-Up 27-28 10.3 Maintenance of the redox probe...
  • Page 6 Ending of the adaptation with error 17.6 Determination of the controller parameters using Tu and Ts COM INTERFACE CARD SERVICING AND REPAIR TECHNICAL DATA 20.1 DEPOLOX 4 measuring cell 20.2 Basic unit for wall mounting 20.3 Chlorine residual amplifier 20.4 pH measuring amplifier 20.5...
  • Page 7 Cellule de measure DEPOLOX 4 with bill of Material BZ-1141/E Flow regulator, complete with bill of material BZ-1179/E Sample water take off unit for DEPOLOX 4 with bill of material BZ-1165/E DEPOLOX 4 sample water arrangement BZ-1166/E Sample water arrangement incorporating sample water pump...

  • Page 8: General

    The DEPOLOX 4 residual analyser may be used for the continuous measurement of disinfectant residuals such as chlorine, chlorine dioxide or ozone.

  • Page 9: Chlorine Dioxide

    Potable water must not contain any ozone. Swimming pool water is required to contain less than 0.05 mg/l of ozone before entering the pool. DEPOLOX 4 - INSTALLATION AND THEORY OF OPERATION INSTALLATION OF A COMPLETE CHLORINE RESIDUAL ANALYSER DEPOLOX 4 (see page 10)

  • Page 11: Theory Of Operation

    If desired, electrodes for pH-value and Redox measurement can be inserted into the two holes (BZ-1150/2-5/E, fig. 2A, item 48) in the removable cover of the measuring cell. This means that the DEPOLOX 4 measuring cell can be augmented with extra measuring devices without any additional piping.

  • Page 12: Temperature Compensation

    It is made up of both the flow time in the main line from the point of application to the sample take-off point, and the flow time in the sample line from the sample take-off point to the DEPOLOX 4. It is recommended that the sample line be kept as short as possible.

  • Page 13: Sample Water Take-Off

    The pressure at the inlet of the DEPOLOX 4 analyser must be within a 0.15 to 4.0 bar g range. In this pressure range, a constant water flow of 33 l/h is provided irrespective of pressure fluctuations.

  • Page 14: Sample Water Drainage

    15 mm PVC pipe (pressureless drainage). If the DEPOLOX 4 analyser cell used is of the pressure-resistant type, the back pressure in the sample water return line must not exceed a maximum of 1.5 bar; the sample water inlet pressure must always be 0.5 bar higher than the back pressure (max.

  • Page 15: Depolox 4 Analyzer (Pressure Type Max 1.5 Bar)

    DEPOLOX 4 ANALYZER (PRESSURE TYPE MAX 1.5 BAR) (BZ-1150/5-5/E, fig. 2F) Unscrew nut (fig. 2F, item 62). Remove cover (fig. 2F, item 71). Pull electrode assembly down and out of cell block. Remove felt ring (transport protection of membrane). Exchange plug against separately supplied plug fitted with membrane for venting of the elctrolyte reservoir.
  • Page 16 0.03 mg/l HI/LO Alarm set - - - (switched off) mA output signal 0...20 mA Selection cell DEPOLOX 4 Bias volts 250 mV Operation chlorination A detailed description of the amplifier functions is contained in the chapter "Amplifier" (page 34, item 11.5).

  • Page 17: Calibration Of The Depolox 4 Amplifier

    As the water quality at individual locations may differ considerably, the calibration of the DEPOLOX 4 analyser has to be carried out on site. As already mentioned, the unit has to operate continuously for at least 24 hours before calibration can be started.

  • Page 18: Zero Calibration

    ZERO CALIBRATION Activate manual operation mode and press key "F" until "ZRO mg/l" is displayed. Close shut-off valve (page 10, item 20) to shut off sample water flow and wait for 3 minutes. Press key "E" to enter the zero current. Open shut-off valve.

  • Page 19: Measured Value Calibration

    MEASURED VALUE CALIBRATION After completing the zero calibration, open shut-off valve (page 10, item 20) and wait at least 2 minutes. Activate manual operation mode and press key "F" until "DPD mg/l" is displayed. Take a sample from the drain hose and determine the content of free chlorine, chlorine dioxide or ozone by means of the DPD method (colorimetre or photometer).

  • Page 20: Maintenance

    (electrolyte U-95 655). A visual check is necessary only every 2 months. In cases where the DEPOLOX 4 is used for water having a temperature above 35°C (Hot-Whirl-Pools) the electrolyte for the reference electrode has to be renewed every 4-6 months, for normal applications every 12 months.

  • Page 21: Strainer

    STRAINER The strainer (page 10, fig. 1, item 3) should be cleaned periodically depending on the local water quality. The frequency of cleaning should be determined locally as required. ELECTRODES As grit is used for cleaning the working electrode and the counter electrode, these wear down gradually.

  • Page 22: Troubleshooting

    TROUBLESHOOTING PROBLEM CAUSE REMEDY Insufficient sensitivity Insufficient water flow. Check water flow, remove any contaminants in sample water line or in measuring cell, clean strainer. Contaminated electrodes. Clean electrodes. Changed grit colour Replace grit. (yellow/brown). Excessive pH-value Adjust pH-valve. Unsteady signal. Membrane clogged.

  • Page 23: Ph-Value Analyser

    The pH-value analyser consists of a pH probe, an impedance transformer, a special cable and a plug-in amplifier. For combined chlorine and pH-value measurement, the transparent cell block of the DEPOLOX 4 chlorine measuring cell serves as flow-through assembly. If only the pH-value has to be measured, a special flow-through assembly is available.
  • Page 24 Press key "F" until "Cal. pH7" for calibration with buffer solution pH is displayed. Remove pH probe from Depolox 4 cell, immerse it in pH 7 buffer solution and agitate gently. As soon as the digital display has stabilized, press key "E" to enter calibration value pH 7 (display: 7.00 pH).

  • Page 25: Maintenance Of Ph Probe

    0.5 pH units between the value displayed on the DEPOLOX 4 amplifier and the value obtained from the sample water discharge from the DEPOLOX 4. The cause for such a deviation is the degassing of carbonic acid in the sample water drain hose.

  • Page 26: Spare Parts And Chemicals For Maintenance

    SPARE PARTS AND CHEMICALS FOR MAINTENANCE For the maintenance of pH probes, a complete service case is available (order no. U- 93 395). Any item in the service case may also be ordered separately. pH probe, order no. U-95 690 with impedance transformer, order no.

  • Page 27: Redox Analyser

    For combined chlorine and Redox measurement, the transparent cell block of the DEPOLOX 4 chlorine measuring cell serves as flow- through assembly. If only the Redox value has to be measured, a special flow-through assembly is available.

  • Page 28: Maintenance Of The Redox Probe

    Basic set-up (Redox amplifier without PID controller) MENU Range zero point ZRO 400 mV Range final value RGE 900 mV Code Setpoint (control contact) 700 mV Control direction INCR. HI alarm set 900 mV LO alarm set 400 mV Limit value time delay 0.00 min Hysteresis 3 mV...

  • Page 29: Spare Parts And Chemicals For Maintenance

    10.4 SPARE PARTS AND CHEMICALS FOR MAINTENANCE mV-Redox probe, order no. U-95 691 with impedance transformer, order no. U-95 607 and pH/mV cable, order no. U-93 838 Redox control solution + 468 V (for Ag/AgCl 3 mol KCL), supplied in a 250 ml glass bottle order no.

  • Page 30: Amplifier

    AMPLIFIER 11.1 INSTALLATION Mount the basic unit (dimensions W 337 x H 223 x D 223 mm) in the 4 mounting holes. If the front door is closed, the enclosure is IP 65. A maximum of 3 plug-in amplifiers and 1 COM interface card can be plugged into the basic unit.

  • Page 31: Dimensions Of Basic Unit, Plug-In Amplifiers

    11.1.1 DIMENSIONS OF BASIC UNIT, PLUG-IN AMPLIFIERS AND COM INTERFACE CARD B-74.PCX - edition 01/1993 Basic unit for wall mounting Plug-in amplifier COM-Interface card B-75.PCX - edition 01/1993 Order No. for amplifiers: refer to table BZ-1245-E.

  • Page 32: Electrical Installation

    11.2 ELECTRICAL INSTALLATION Unit for panel mounting: see W/D 30-E-7578, sheets 1 and 2. Connect the mains power supply to terminals L/N/PE for the supply of all plug-in modules. A 16 A protecting fuse for the mains power supply must be provided. The current flows via the basic unit PCB to the terminal blocks of the plug-in units.

  • Page 33: Front Panel

    11.3 FRONT PANEL measured value display LED’s for controller output (optional) text display temperature display (optional) keypad handle with designation 4 mounting screws B-45.PCX - edition 01/1993 The front plate design is the same for all amplifiers. The front plate consists of a 3-digit 7-segment LED measured-value display, a text display (5 x 7 dot matrix) and a keypad with 6 keys.

  • Page 34: Keypad

    11.4 KEYPAD parameter menu Parameters such as limit values, mA output or, if option "controller" has been selected, controller parameters are set in the P menu. function menu Settings such as zero point, measured value and measuring range can be set in the F menu. They are used to select values in direction keys the P or F menus and for the...

  • Page 35: Basic Amplifier Setup

    11.6 BASIC AMPLIFIER SET-UP The German set of characters is used as standard in the matrix text display. For changing this configuration (switch S1 on processor PCB), the amplifier has to be removed from the basic unit. Use switches 1 and 2 to select the language and switch 3 to activate option "temperature"...

  • Page 36: Chlorine Measuring Amplifier

    Al N.O. --- switched off Selection of mA output 0...20 / 4...20 / 0...5 / 0...10 mA 0...20 mA --- switched off Selection cell Depolox 3, Depolox 4 DEPOLOX 4 Bias voltage 50 mV... 999 mV Upot Direction of contact Chlorination...
  • Page 37 EXTENDED PARAMETER MENU (Cl AMPLIFIER WITH CONTROLLER) Selected control element: electric positioner or motorized valve (3-point step controller) Ym (%) Tuning of feedback signal Automatic tuning of the feedback signal and measurement of Ty Xp (%) Controller parameter Prop. band 1...999 % Ty (sec) Running time of electric Running time 10-180 sec.

  • Page 38: Function Menus (Cl Amplifier)

    12.2 FUNCTION MENUS (CL AMPLIFIER) TEST DISPLAY DESCRIPTION POSSIBLE SETTING Zero calibration Sets zero point at 0.00 mg/l ZRO mg/l Measured value calibration Sets value determined by DPD DPD mg/l method Selection measuring range 1.00 / 2.00 / 5.00 / 9.99 mg/l RGE mg/l 500 ppb Display of cell current in µA...

  • Page 39: Control Element Electric Positioner Or Regulating Valve

    12.3.1 CONTROL ELEMENT ELECTRIC POSITIONER OR REGULATING VALVE Swimming pool water: Controller Children’s pool Swimmers’ pool Swimmers’ pool parameter Indoor bath Indoor bath Outdoor bath Volume 90 m Volume 900 m Volume 175 m Dead time 10 min Dead time 12 min Dead time 3 min (vertical through- flow)

  • Page 40: Control Element Metering Pump, Solenoid Pump, Continuous Output

    12.3.2 CONTROL ELEMENT METERING PUMP, SOLENOID PUMP, CONTINUOUS OUTPUT Controller Indoor bath swimming pool 100 m parameter feed rate D10 - 10 l/h 0.50 mg/l 10 % 60 sec Ymin Ymax 100 % 20 min * Recommended Tp time for metering pumps Metering pump - 20 20 - 40...

  • Page 42: Adjustment Of Feedback Display

    12.4.3 ADJUSTMENT OF THE FEEDBACK DISPLAY In order to compensater for tolerances and possible limitations of the electric positioner the feedback display must be tuned. Preconditions: Electric positioner is in the AUTO position (handwheel engaged). Running time of electric positioner 0..180 sec. Electric interlocks of positioner must be inactivated.

  • Page 43: Ph Measurement Amplifier

    pH MEASUREMENT AMPLIFIER 13.1 PARAMETER MENU (STANDARD pH AMPLIFIER) TEXT DISPLAY DESCRIPTION POSSIBLE SETTINGS Prevention of unauthorized Access code: 904 CODE access to following menus SP pH Desired value (contact) All settings in the selected measuring range (F-menu) = pH HI alarm Settings from limit value min to top value of measuring range...
  • Page 44 EXTENDED PARAMETER MENU (pH AMPLIFIER WITH CONTROLLER) Control element: electric positioner or motorised valve (3-point step controller) Xp (%) Control parameter Prop. band 1...999 % Ty (sec) Running time of electric Running time 10...180 sec positioner Tn (min) Control parameter Integral action time 1...99.9 min Control element: metering pump (pulse duration control)

  • Page 45: Function Menu (Ph Amplifier)

    13.2 FUNCTION MENU (pH-AMPLIFIER) TEXT DESCRIPTION POSSIBLE SETTINGS DISPLAY COMP °C Internal temperature 0...99°C compensation (An external Pt 100 sensor (0...50°C) can be connected as an option.) CAL pH 7 pH 7.0 calibration Calibration only with buffer (zero point) solution pH 7.0. CAL pH pH calibration (slope) Any buffer solution, e.g.

  • Page 46: Set-Up Of Control Parameters For Initial Operation

    13.3 SET-UP OF CONTROL PARAMETERS FOR INITIAL OPERATI- ON (PARAMETER MENU) 13.3.1 FOR METERING PUMPS (PULSE DURATION OR CONTINUOUS CONTROLLER) pH 7.20 Setpoint 10 % Control amplification (factor 10) 60 s Pump cycle (ON + OFF time) Ymin No basic load Ymax 100 % No max.

  • Page 47: Redox Measurement Amplifier

    REDOX MEASUREMENT AMPLIFIER 14.1 PARAMETER MENU (STANDARD REDOX AMPLIFIER) TEXT DESCRIPTION POSSIBLE SETTINGS DISPLAY CODE Prevention of unauthorized Acces code 904 access to following menus SP = mV Setpoint (contact) All values in the selected range (F menu) = mV HI alarm Settings from limit value min to top value of...
  • Page 48 EXTENDED PARAMETER MENU (REDOX AMPLIFIER WITH CONTROLLER) Control element: electric positioner or motorised valve (Redox amplifier with controller) Xp (%) Control parameter Prop. band 1...999 % Ty (sec) Running time of electric Running time 10...180 sec positioner Tn (min) Control parameter Integral action time 1...99.9 min Control element:...

  • Page 49: Function Menu (Redox Amplifier)

    14.2 FUNCTION MENU (REDOX-AMPLIFIER) Text Description Possible settings display CAL. mV Electrode calibration Use Redox buffer solution (468 mV) ZRO mV Bottom value of measuring 0...700 mV range RGE mV Top value of measuring 300...999 mV range Display of probe voltage ±...

  • Page 50: Error Messages

    Check connection cables measuring cell cable/max. and measuring cell current. zero point compensation (Data sheet BZ-1145) exceeded (± 5 µA for Depolox 4 and > + 100 µA for Depolox 3 systems). *DPD? Slope error in chlorine Check measuring cell; measurement amplifier.
  • Page 51 (> 10 mg/l?) - 5 µA...+ 200 µA Check measuring cell (short circuit) DEPOLOX 4: check bias voltage in P menu. *mV? The voltage of pH-value or Check electrode connections Redox electrode is outside (cable poles, correct the limits of pH 0..14 /...
  • Page 52 ERROR MESSAGE CAUSE REMEDY *RAM? Hardware error in data Must be repaired in W&T memory. factory. *Pt 100? Cable failure or short circuit Check temperature sensor in a temperature sensor. and cable. * COM? Incorrect transmission of Value outside range. data between amplifier, PC Wrong format/time.

  • Page 53: Integrated Controller (Option)

    INTEGRAL CONTROLLER (OPTION) For the chlorine, pH and Redox analyzers the option "digital controller" is available. With this option the following positioners can be controlled: Electric positioner or regulating valve (three-step controller) Motorized metering pumps, solenoid valves (pulse duration controller) Solenoid metering pumps (pulse frequency controller) Frequency converter, thyristor controller (continuous PID controller output) The type of the positioner connected is selected by the software in the menu.

  • Page 57: Controller With Continuous Output

    16.4 CONTROLLER WITH CONTINUOUS OUTPUT This controller operating as a fixed value controller with continuous output calculates in function of the measured value and the stored setpoint and the control parameters an output current proportional to feedrate. The output current can be set to be 0...20 mA, 4...20 mA, 0...5 mA or 0...10 mA.

  • Page 58: Control Parameters And Their Influence On The Control Loop

    16.5 CONTROL PARAMETERS AND THEIR INFLUENCE ON THE CONTROL LOOP Xp proportional factor With the proportional factor the controller influence (gain) is affected by a control deviation. Gain = (1/Xp) x 100 % For example, Xp = 100 % signifies that a control deviation of 10 % (measuring range 1.0 mg/l, setpoint 0.50 mg/l, actual value 0.40 mg/l) is amplified by the factor 1.
  • Page 59 Ymax feedrate limitation (only applicable for metering pumps, solenoid pumps or continuous positioners) Ymax has been defined in conjunction with the metering pump activation as the feedrate limitation. With Ymax = 100 %, the feedrate factor Y is present at the controller output. With a large control deviation the metering pump can run in continuous mode.
  • Page 61 Control direction In conjunction with the "Controller" option, menu item "Control direction" is interrogated in the P-menu. Available at the chlorine measuring amplifier are "Chlorine" or "Dechlorination". Possible selections at the pH measuring amplifier are "Acid" and "Alkaline". This defines the activation behaviour of the output relay for the positioning element. "Chlorine"...

  • Page 62: Adaptation Of The Chlorine Amplifier

    ADAPTATION OF THE CHLORINE AMPLIFIER B-56.PCX - edition 01/1993 17.1 USE OF THE ADAPTATION The adaptation is used for the automatic determination of the reaction times of the control loop (dead time Tu and raise time Ts) respectively of the resulting controller parameters Xp and Tn.

  • Page 63: Preconditions For The Adaptation

    17.2 PRECONDITIONS FOR THE ADAPTATION Electric positioner or metering pump to be on automatic mode Calibrated amplifier (zero and DPD value) Dead time < 60 min. Raise time < 480 min. (8 h) for 0...100 % feed range Decomposition time of measured chlorine residual to 20 % of measuring range <...

  • Page 64: Sequence Of The Adaptation

    17.4 SEQUENCE OF THE ADAPTATION By selecting code No. 900 in the code menu the menus for the adaptation are made accessible. Instead of the standard P menus now the adaptation menus are displayed. The adaptation is started in the menu "Adapt" by pressing key "E". Each phase of the adaptation is displayed indicating the respective status, for example "Adapt 02".

  • Page 65: Ending The Adaptation Sequence

    17.5 ENDING THE ADAPTATION SEQUENCE The adaptation sequence may be stopped at any time using the MAN/AUTO key. The set parameters remain unchanged. 17.5.1 ENDING OF THE ADAPTATION WITHOUT ERROR After the loop periods (dead time Tu and raise time Ts) have been determined without an error, calculation of the control parameters Xp and Tn starts.

  • Page 66: Ending Of The Adaptation With Error

    17.5.2 ENDING OF THE ADAPTATION WITH ERROR In case there are serious disturbances of the control loop during the adaptation period, for example filter back-washing, or if the control loop is too long, the adaptation process is stopped. Possible error conditions: Starting value not reached After activation of the adaptation and running the chlorinator to zero or switching off the dosing pump, the amplifier...

  • Page 67: Determination Of The Controller Parameters Using Tu And Ts

    17.6 DETERMINATION OF THE CONTROLLER PARAMETERS USING Tu AND Ts If the loop periods Tu and Ts are already known or if it is impossible to determine them automatically, the manually measured loop periods may be entered into the menus "Tu (min)"...

  • Page 68: Com Interface Card

    COM INTERFACE CARD Measuring amplifiers of the DEPOLOX 4 serie may be related to RS485-PROWAY via interface card COM485. Placing of the interface card is possible in every box of the DEPOLOX 4. It is used as an interface for 1 to 3 amplifiers.

  • Page 69: Technical Data

    TECHNICAL DATA 20.1 DEPOLOX 4 MEASURING CELL Measuring cell: potentiostatic 3 electrode cell Accuracy: 0.01 mg/l ± 1 digit (2 % of full scale value) Sensitivity: 0.01 mg/l (1 % of full scale value) Repeatability: 0.01 mg/l ± 1 digit...

  • Page 70: Chlorine Residual Amplifier

    20.3 CHLORINE RESIDUAL AMPLIFIER Measuring range: 0 ... 500 ppb / 0 ..1.0 / 0 ... 2.0 0 ... 5.0 / 0 ... 9,99 mg/l Current inputs: - 5 ... 200 µA Current output: 0 ... 20 / 4 ... 20 / 0 ... 10 / 0 ... 5 mA volt-free (500 V to earth) Load voltage 10 V Accuracy 0.2 % referred to full scale value...

  • Page 71: Ph Measuring Amplifier

    20.4 pH MEASURING AMPLIFIER Measuring range: pH 0 ... pH 14 stepless adjustable bottom value pH 0 ... pH 5 stepless adjustable top value pH 9 ... pH 14 Current output: 0 ... 20 / 4 ... 20 / 0 ... 10 / 0 ... 5 mA volt-free (500 V to earth) Load voltage 10 V Prescision 0.2 % referred to full scale value...

  • Page 72: Redox Measuring Amplifier

    20.5 REDOX MEASURING AMPLIFIER Measuring range: 0 mV ... +999 mV stepless adjustable range, min. 300mV between bottom and top value Current output: 0 ... 20 / 4 ... 20 / 0 ... 10 / 0 ... 5 mA volt-free (500 V to earth) Load voltage 10 V Prescision 0.2 % referred to full scale value Temperature drift 0.1 % / 10°C...

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