wtw VARiON Plus 700 IQ Operating Manual
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wtw VARiON Plus 700 IQ Operating Manual

Modular combination sensor for ammonium and nitrate
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  • Page 2 The latest version of the present operating manual can be found on the Internet under www.WTW.com. © Copyright Weilheim 2007, WTW GmbH Reprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim. Printed in Germany. ba75580e03 04/2007...

  • Page 3: Table Of Contents

    ® Plus VARiON 700 IQ Contents ® Plus VARiON 700 IQ - Contents Overview ........1-1 How to use this component operating manual .
  • Page 4 ® Plus Contents VARiON 700 IQ Measuring ........5-1 Measuring operation .

  • Page 5: Overview

    ® Plus VARiON 700 IQ Overview Overview How to use this component operating manual Structure of the IQ Sensor Net Operating Manual IQ S ENSOR operating manual System Operating Manual (Ring Binder) IQ Sensor MIQ Module MIQ Terminal Operating Operating Operating Manual Manual...

  • Page 6: Structure Of The Combination Sensor Varion ® Plus 700 Iq

    To determine the interfering ions concentration, another electrode (compensation electrode) is mounted into a free receptacle. Note Information on the fundamentals of measuring with ion sensitive electrodes are given in the WTW primer, I ON SELECTIVE MEASUREMENT IN ONLINE ANALYSIS ® Plus...
  • Page 7 ® Plus VARiON 700 IQ Overview Notes: The reference electrode has an extra receptacle marked by a recess. The ion sensitive electrodes can be mounted in the remaining three receptacles in any order. Empty receptacles have to be closed with the ®...

  • Page 8: Recommended Fields Of Application

    Note More detailed information on measuring with ion sensitive electrodes is given in the WTW primer, I ON SELECTIVE MEASUREMENT IN ONLINE ANALYSIS 1 - 4...

  • Page 9: Safety Instructions

    ® Plus VARiON 700 IQ Safety instructions Safety instructions This component operating manual contains special instructions that ® Plus must be followed in the operation of the VARiON 700 IQ combination sensor. Thus, it is essential to read this component operating manual before carrying out any work using this sensor.

  • Page 10: Authorized Use

    The specified temperature (chapter 9 T ) must be ECHNICAL DATA maintained during the operation and transport of the sensor. Protect the sensor, particularly against frost or overheating. Caution The sensor may only be opened by specialists authorized by WTW. 2 - 2 ba75580e03 04/2007...
  • Page 11 ® Plus VARiON 700 IQ Safety instructions Safe operation If safe operation is no longer possible, the sensor must be taken out of operation and secured against inadvertent operation. Safe operation is no longer possible if the sensor: z has been damaged in transport z has been stored under adverse conditions for a lengthy period of time z is visibly damaged...
  • Page 12 ® Plus Safety instructions VARiON 700 IQ 2 - 4 ba75580e03 04/2007...

  • Page 13: Commissioning

    Potassium chloride solution for storing the reference electrode z Operating manual and WTW primer, I ON SELECTIVE MEASUREMENT IN ONLINE ANALYSIS Note Information on the available sets is given in the WTW catalog and on the Internet. IQ S system requirements ENSOR ®...

  • Page 14: Notes On The Handling Of The Electrodes

    ® Plus Commissioning VARiON 700 IQ Notes on the handling of the electrodes ® Plus The electrodes of the VARiON 700 IQ combination sensor were developed for the rough use in waste water treatment plants. They are, however, precision parts that can be damaged by inappropriate use. Therefore, exactly follow the instructions in the two following chapters.
  • Page 15 ® Plus VARiON 700 IQ Commissioning 3.3.2 Measurement electrodes and compensation electrodes Commissioning Electrode Watering cap Sealing ring Fig. 3-2 Measurement electrode or compensation electrode with storing aids In the delivery condition, each electrode is equipped with a watering cap and a nut that protects the screw-in thread. Prior to installation, first remove the watering cap and, using the special hexagon key, unscrew the electrode from the nut.

  • Page 16: Measurement Electrodes And Compensation

    ® Plus Commissioning VARiON 700 IQ Preparing the sensor for measurement 3.4.1 Equipping the sensor with electrodes Caution The sensor can be damaged by dirt and moisture. Before mounting the electrodes make sure the area behind the sealing ring of the electrodes and the receptacle are dry and clean. The ®...

  • Page 17: Mounting The Protective Hood

    Information on the required ENSOR components is given in the WTW catalog and on the Internet. If no CH cleaning head is used the standard protective hood should always be mounted for measuring. It protects the electrodes from rough mechanical impact.
  • Page 18 Do not suspend the sensor on the sensor connection cable. Use an armature or electrode holder. Information on this and other IQ S ENSOR accessories is given in the WTW catalog and on the Internet. Note How to connect the SACIQ sensor connection cable to the...
  • Page 19 ® Plus VARiON 700 IQ Commissioning Are the plug Before connecting the sensor and sensor connection cable, make sure connections dry? that the plug connections are dry. If moisture gets into the plug connections, first dry the plug connections (dab them dry or blow them dry using compressed air).

  • Page 20: Settings

    ® Plus Commissioning VARiON 700 IQ Settings 3.5.1 General information ® Plus Automatic electrode The VARiON 700 IQ software automatically recognizes the built- recognition in electrodes and checks the equipment for validity. Depending on the equipment, the following sensors are displayed in the list of sensors: Sensor Designation ®...
  • Page 21 The measured value is corrected corresponding to the entered potassium content (0 = no potassium compensation) Note: Detailed information on the subject of potassium compensation is given in the WTW primer, I ON SELECTIVE MEASUREMENT IN ONLINE ANALYSIS ba75580e03 04/2007 3 - 9...
  • Page 22 ® Plus Commissioning VARiON 700 IQ Menu item Selection/values Explanations Calib. history K Do not download Send to log book generates a log book (only with Potassium message with the calibration history of the Transmit to log book compens. Automatic ) potassium electrode.

  • Page 23: Setting Table Of The Varion N (Nitrate Sensor)

    (0 = no chloride compensation) Note: Detailed information on the subject of chloride compensation is given in the WTW primer, I ON SELECTIVE MEASUREMENT IN ONLINE ANALYSIS Calib. history Cl Do not download Send to log book generates a log book...
  • Page 24 ® Plus Commissioning VARiON 700 IQ Menu item Selection/values Explanations Temperature mode °C Unit of the measured temperature value (Celsius, Fahrenheit). °F Temp. adjustment -1.5 °C ... +1.5 °C The temperature compensation function enables the temperature sensor to be balanced against a reference temperature measurement (displacement of the zero point by ±1.5 °C).

  • Page 25: Matrix Adjustment, Check And Calibration

    ® Plus VARiON 700 IQ Matrix adjustment, check and calibration Matrix adjustment, check and calibration General information ® Plus Calibration free The VARiON 700 IQ combination sensor is immediately ready to operation measure after being equipped with electrodes. For precise measurements, it is only necessary to adjust the electrodes to the sample matrix ("matrix adjustment").
  • Page 26 ® Plus Matrix adjustment, check and calibration VARiON 700 IQ Drift potential Simultaneously with the matrix adjustment (or calibration), the drift voltage DV(mV) of the combination electrode is determined. It serves to evaluate the long-term behavior of the combination electrode. The drift voltage changes due to the following factors: z Influences due to the sample composition (matrix) z Changes of the electrode characteristics.

  • Page 27: Matrix Adjustment

    ® Plus VARiON 700 IQ Matrix adjustment, check and calibration Matrix adjustment 4.2.1 General information on matrix adjustment This procedure adjusts the value directly measured in the test sample to an independently determined reference value ("lab value"). To determine the reference values, a sample is taken from the measuring solution and the relevant concentrations are measured (e.g.

  • Page 28: Result Of The Matrix Adjustment

    ® Plus Matrix adjustment, check and calibration VARiON 700 IQ Practical instructions z Ammonium and nitrate have to be determined immediately after taking the sample as the their content changes very quickly due to the micro organisms that are present. It is best to take the sample using a syringe filter for transport to the laboratory or to stabilize it otherwise.
  • Page 29 ® Plus VARiON 700 IQ Matrix adjustment, check and calibration History of matrix The history of matrix adjustments can be viewed in the so-called adjustments calibration history. (available in the IQ S systems ENSOR 184 XT and 2020 XT only) Last electrode zeroing via matrix adjustment...

  • Page 30: Check And Calibration In Standard Solutions

    ® Plus Matrix adjustment, check and calibration VARiON 700 IQ Note The history of matrix adjustments of the compensation electrode (potassium or chloride) is not output with the calibration history of the relevant sensor (VARiON A or VARiON N). If necessary, you can generate a log book message with the calibration history via the menu item, Calib.
  • Page 31 The procedure can, however, be used as a mere check method. Calibration is documented in the calibration history and in the log book. Standard solutions For the check or calibration, the following two WTW standard solutions are required in this order: ® z VARiON /ES-2 (high concentration) ®...

  • Page 32: Result Of The Check

    ® Plus Matrix adjustment, check and calibration VARiON 700 IQ Preparations and z Select a place where clean working conditions and a constant, instructions on how to sufficiently high temperature are granted (a room, e.g. laboratory). keep the basic Temperatures under 10 °C extend the conditioning time conditions considerably.

  • Page 33: Result Of The Calibration

    ® Plus VARiON 700 IQ Matrix adjustment, check and calibration 4.3.3 Result of the calibration Evaluation With calibration, the system automatically evaluates the condition of a combination electrode based on the data of its characteristic curve. The drift potential and slope are evaluated separately. For a calibration procedure to be valid, the potential level, slope and drift voltage must be within certain ranges.
  • Page 34 ® Plus Matrix adjustment, check and calibration VARiON 700 IQ Calibration history In the calibration history, a calibration has the entries ES1 and ES2 in (available in the the Ref1 and Ref2 columns which the matrix adjustment has not: IQ S systems ENSOR 184 XT and 2020 XT...
  • Page 35 ® Plus VARiON 700 IQ Matrix adjustment, check and calibration Note The calibration history of the compensation electrode (potassium or chloride) is not output with the calibration history of the relevant sensor (VARiON A or VARiON N). If necessary, you can generate a log book message with the calibration history via the menu item, Calib.
  • Page 36 ® Plus Matrix adjustment, check and calibration VARiON 700 IQ 4 - 12 ba75580e03 04/2007...

  • Page 37: Measuring

    Potassium ions Nitrate z Chloride ions Note The effects of influencing variables on measurement and compensating actions are described in detail in the WTW primer, I SELECTIVE MEASUREMENT IN ONLINE ANALYSIS ba75580e03 04/2007 5 - 1...
  • Page 38 ® Plus Measuring VARiON 700 IQ 5 - 2 ba75580e03 04/2007...

  • Page 39: Maintenance And Electrode Exchange

    ® Plus VARiON 700 IQ Maintenance and electrode exchange Maintenance and electrode exchange General maintenance notes Warning Contact with the sample can be dangerous for the user! Depending on the type of sample, suitable protective measures must be taken (protective clothing, protective goggles, etc.). Maintenance condition We recommend to switch on the maintenance condition each time the sensor is taken out of the measuring position.
  • Page 40 ® Plus Maintenance and electrode exchange VARiON 700 IQ ® Fig. 6-1 Sample equipment of the VARiON Case calibration and maintenance case Blind plug Special socket wrench Polishing strip Replacement electrodes with watering caps Compartments for various accessories (wiping cloths, sample bottles, personal protective equipment etc.) Recess for sensor Storing solution for reference electrode...

  • Page 41: Exterior Cleaning

    ® Plus VARiON 700 IQ Maintenance and electrode exchange Exterior cleaning Note To keep the electrodes clean, we recommend to use the CH cleaning head (see chapter 7 R EPLACEMENT PARTS AND ACCESSORIES With normal operation (e.g. municipal wastewater) we strongly recommend to clean the outside of the sensor and calibrate: z when it is strongly contaminated (after visual check) z if erroneous measured values are suspected...
  • Page 42 ® Plus Maintenance and electrode exchange VARiON 700 IQ Cleaning the coupling The coupling ring can be unscrewed and dismantled for cleaning as ring of the protective follows: hood Fig. 6-2 Dismantling the coupling ring Remove the retaining ring (pos. 1 in Fig. 6-2). Remove the intermediate ring (pos.

  • Page 43: Exchanging The Electrodes

    ® Plus VARiON 700 IQ Maintenance and electrode exchange Exchanging the electrodes Caution The sensor can be damaged by dirt and moisture. Each time before dismantling an electrode carefully clean the area around the electrodes (section 6.2). Before mounting an electrode make sure the area behind the sealing ring of the electrode and the ®...

  • Page 44: Polishing The Chloride Electrode

    ® Plus Maintenance and electrode exchange VARiON 700 IQ Polishing the chloride electrode Caused by the test medium, a coating can develop on the surface of the chloride electrode, which reduces the electrode slope. To maintain a proper chloride compensation the surface must be renewed by polishing at regular intervals.

  • Page 45: Replacement Parts And Accessories

    ® Plus VARiON 700 IQ Replacement parts and accessories Replacement parts and accessories Electrodes Exchange electrodes Description Model Order no. ® Reference electrode VARiON 107042 ® Plus Ammonium electrode VARiON 107044 ® Plus Nitrate electrode VARiON 107045 ® Plus Potassium electrode VARiON 107046 ®...
  • Page 46 Active valve module (does not MIQ/CHV PLUS 480018 require a free relay output in the IQ S system) ENSOR Note Information on other IQ S accessories is given in the WTW ENSOR catalog and on the Internet. 7 - 2 ba75580e03 04/2007...

  • Page 47: What To Do If

    ® Plus VARiON 700 IQ What to do if ... What to do if ... Interpretation of the drift voltage The drift voltage is influenced by the potential levels of the measurement electrode and reference electrode. If the potential levels shift, e.g.

  • Page 48: Error Causes And Remedies

    ® Plus What to do if ... VARiON 700 IQ Error causes and remedies No measured value Cause Remedy display – Sensor not connected – Connect the sensor – Incorrect electrode – Correct electrode equipment equipment – Electrode(s) not at all or –...
  • Page 49 ® Plus VARiON 700 IQ What to do if ... Cause Remedy – Electrode contaminated – Clean the electrode (see section 6.2) – Liquid in the sensor shaft – Sensor defective, send it back Measurement provides Cause Remedy jumping, unstable or –...
  • Page 50 ® Plus What to do if ... VARiON 700 IQ Faulty result of the Cause Remedy matrix adjustment – Error during procedure, e.g. – Check the basic conditions incorrect lab values – Follow the practical notes on page 4-4 or in the online help –...

  • Page 51: Technical Data

    ® Plus VARiON 700 IQ Technical data Technical data Measuring characteristics Measuring principle Potentiometric measurement by means of ion sensitive electrodes. Modular structure with jointly used reference electrode and ion sensitive electrodes. Integrated microprocessor electronics, screened 2-wire connection for power and data transmission. Measured parameters Main measured parameters Ammonium and/or nitrate...

  • Page 52: Application Conditions

    ® Plus Technical data VARiON 700 IQ Selectable procedures Compensation procedures Description Automatic up to 1000 mg/l interfering ions interfering ions when equipped with the compensation corresponding compensation electrode (chloride for nitrate measurement or potassium for ammonium measurement) Manual without compensation electrode by manual entry of the interfering ions concentration...

  • Page 53: General Data

    ® Plus VARiON 700 IQ Technical data Depth of immersion min. 50 mm; max. 2 m depth Operating position Electrode support pointing downward (maximum angle to the plumb line = 60 °) Fields of application z Control / monitoring in the aeration tank of a waste water treatment plant z Water and waste water monitoring General data...

  • Page 54: Electrical Data

    ® Plus Technical data VARiON 700 IQ Electrical data Nominal voltage max. 24 VDC via the IQ S (details see ENSOR chapter of the TECHNICAL DATA IQ S system operating ENSOR manual) Power consumption 0.2 W Protective class 9 - 4 ba75580e03 04/2007...

  • Page 55: Data Of The Varion ® Plus Electrodes

    ® Plus VARiON 700 IQ Technical data ®Plus Data of the VARiON electrodes 9.5.1 Response times ®Plus ®Plus ®Plus ®Plus VARiON VARiON NO3 VARiON VARiON Response time t < 3 min < 3 min < 3 min < 3 min Measured at 20 °C (68 °F) and a 10 to 100 mg/l 5 to 50 mg/l...
  • Page 56 ® Plus Technical data VARiON 700 IQ 9 - 6 ba75580e03 04/2007...

  • Page 57: Indexes

    ® Plus VARiON 700 IQ Indexes Indexes 10.1 Explanation of the messages This chapter contains a list of all the message codes and related message texts that can occur in the log book of the IQ S ENSOR ® Plus system for the VARiON 700 IQ sensor.

  • Page 58: Info Messages

    (see operating manual) EIA521 Incorrect equipment * for correct electrode equipment see operating manual ES1521 Component hardware defective * Contact WTW 10.1.2 Info messages Message code Message text IC3521 K electrode has been successfully calibrated * For calibration data, see calibration history...
  • Page 59 ® Plus VARiON 700 IQ Indexes Message code Message text IC9521 Cl electrode could not be calibrated, Measuring with old calibration values * Check calibration conditions and calibration standard * View calibration history * Service sensor immediately (see operating manual) ICA521 Electrode: check successful ICB521...

  • Page 60: Status Info

    ® Plus Indexes VARiON 700 IQ 10.2 Status info The status info is a piece of coded information about the current state of a sensor. Each sensor sends this status info to the controller. The status info of sensors consists of 32 bits, each of which can have the value 0 or 1.
  • Page 62 Wissenschaftlich-Technische Werkstätten GmbH Dr.-Karl-Slevogt-Straße 1 D-82362 Weilheim Germany Tel: +49 (0) 881 183-0 +49 (0) 881 183-100 Fax: +49 (0) 881 183-420 E-Mail: Info@WTW.com Internet: http://www.WTW.com...

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