1. Manuals
  2. Brands
  3. wtw Manuals
  4. Monitor
  5. Oxi 4000
  6. Operating instructions manual

wtw Oxi 4000 Operating Instructions Manual

Oxygen monitor
Hide thumbs Also See for Oxi 4000:
Table of Contents

Advertisement

Quick Links

Download this manual
Operating instructions
Oxi 4000
Oxi 4000
1
8 5
O
mg/ l
1
5 6
C
°
REL1
Oxygen Monitor
ba75750e01
07/2008
71

Advertisement

Table of Contents
loading

Related Manuals for wtw Oxi 4000

Summary of Contents for wtw Oxi 4000

  • Page 1 Operating instructions Oxi 4000 Oxi 4000 mg/ l ° REL1 Oxygen Monitor ba75750e01 07/2008...
  • Page 2 © Copyright Weilheim 2008, WTW GmbH Reprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim. Printed in Germany. ba75750e01 07/2008...

  • Page 3: Table Of Contents

    Contents Oxi 4000 - Contents Overview ............75 General features .
  • Page 4 Contents Oxi 4000 4.7.5 Display of the relay states in the operating level ......118 Calibration ............118 Display of instrument information .

  • Page 5: Oxi 4000 - Contents

    Oxi 4000 Overview Overview General features Oxi 4000 mg/l ° REL1 Fig. 1-1 Oxi 4000 Waterproof housing (IP 66) Display Operating keys Cable glands ba75750e01 07/2008...

  • Page 6: Outputs And Interfaces

    A further current output in freely configurable addition. For usability, see Oxi 4000 Standard Oxi 4000 RT RS as RT option as RT option 1 x RS 485 1.2.2 Freely configurable relay (RT and RT RS option) Both potential-free K1 and K2 relays of the RT and RT RS instrument...

  • Page 7: Rs 485 Digital Interface (Rt Rs Option)

    Oxi 4000 Overview 1.2.3 RS 485 digital interface (RT RS option) The monitor can communicate with other instruments via the RS 485 digital interface of the RS instrument versions. The following operating modes are possible: Master mode ( mode): Unidirectional mode for the output of measured values.
  • Page 8 Overview Oxi 4000 ba75750e01 07/2008...

  • Page 9: Safety Instructions

    This operating manual contains essential instructions that must be followed during the commissioning, operation and maintenance of the Oxi 4000 monitor. Thus, it is essential for the operator to read this component operating manual before carrying out any work with the system.

  • Page 10: Authorized Use

    Connection of external, mains voltage conducting power circuits to the Oxi 4000 monitor. Authorized use The authorized use of the Oxi 4000 monitor consists solely in the use as part of a measuring system for measuring the oxygen content in drinking water and similar media.
  • Page 11 Safety instructions Safe operation Assuming that risk-free operation is no longer possible, take the Oxi 4000 monitor out of operation and secure it against unintentional operation. Risk-free operation is no longer possible if the Oxi 4000 monitor: has been damaged in transport...
  • Page 12 Safety instructions Oxi 4000 ba75750e01 07/2008...

  • Page 13: Installation

    Oxi 4000 Installation Installation Onsite installation: General instructions The measurement location must meet the environmental conditions specified in chapter 7 T ECHNICAL DATA Pay attention to the following points for outdoor installations: – Always protect instruments installed outdoors against rough weather conditions with a protective cover.

  • Page 14: Electrical Terminal Strip

    Netz Option Option Mains Fig. 3-1 Oxi 4000 terminal strip inside the housing Terminal connections RS 485 A (RS option) Current output REC1+ RS 485 B (RS option) Current output REC1- RS 485 GND (RS option)

  • Page 15: Electrical Connection

    Seal all open cable glands with matching blind plugs. WARNING Free wires must not protrude into the housing of the Oxi 4000 . Danger of short-circuit and fire! Touch-proof circuits can also come into contact with dangerous voltages if touched and lead to life threatening situations when working with the Oxi 4000 .

  • Page 16: Line Power Connection

    Installation Oxi 4000 3.3.2 Line power connection WARNING If the power supply is connected incorrectly, it may represent a danger to life from electric shock. Pay attention to the following points during installation: The monitor must only be connected by an electrician.

  • Page 17: Relay Contacts And Current Outputs

    Oxi 4000 Installation 3.3.3 Relay contacts and current outputs WARNING If external electrical circuits that are subject to the danger of physical contact are incorrectly connected to the relay contacts, there may be a danger of life threatening electric shock. Electrical...

  • Page 18: Connecting The Oxygen Sensor

    X3 terminal strip connection Brown Green White Shield Yellow Gray * Insulate yellow and gray wires and fix to the other wires with a cable tie, for example Oxi ML 41 Fig. 3-2 Sensor connection of Oxi 4000 ba75750e01 07/2008...

  • Page 19: Operation

    Oxi 4000 Operation Operation Display Display elements Oxi 4000 % mg/l Baud ° Ident Auto REL1 REL2 Upper display line: Measured oxygen value, operator guidance Lower display line: Measured temperature value, operator guidance Status displays, depending on instrument status and operating situation...

  • Page 20: Operating Keys

    Operation Oxi 4000 Operating keys The monitor is operated via the following six keys below the display: Key functions Function Call up measuring mode <M> Start the calibration (only active in measuring mode) <C> In measuring mode: Show sensor slope Confirm current selection <ENTER>...

  • Page 21: Operating Levels And General Operating Principles

    Oxi 4000 Operation Operating levels and general operating principles OPERATING LEVEL (Measurement and calibration) 3.) Password entry for editing (optional) or viewing only with PARAMETERIZATION LEVEL ( ) Parameterization settings CONFIGURATION LEVEL ( ) Configuration settings Fig. 4-1 Operating levels...

  • Page 22: Configuration

    Operation Oxi 4000 Configuration 4.4.1 Call up configuration level Call up the configuration level from the operating level as follows: 1 Press <DOWN>. 2 Press <ENTER>. 3 The menu for the password prompt appears. When delivered, no password protection is set up. In this case proceed to the next operating step by pressing <ENTER>...

  • Page 23: Configuration Setting Table

    Oxi 4000 Operation 4.4.2 Configuration setting table General operating The starting point for the settings is the start display of the configuration instructions level (see section 4.4.1): Swap to the first setting with <ENTER>. Operation: All settings of the following setting table are run through step by step.
  • Page 24 Operation Oxi 4000 Setting table: Setting Selection/Values Explanation (values in bold typeface = on delivery) Switches the salt content correction on (On) or off (Off). The salt content correction allows for the salinity equivalent entered in the parameter level when calculating the measured value (see section 4.5.2)
  • Page 25 Oxi 4000 Operation Setting Selection/Values Explanation (values in bold typeface = on delivery) Operating notes: – The setting is carried out in the order: upper final value -> lower final value – Press 1x <ENTER> in between. The following settings are possible: Oxygen, measurement range 0.00 ...
  • Page 26 Operation Oxi 4000 Setting Selection/Values Explanation (values in bold typeface = on delivery) REL 1/2 Switching behavior of the freely configurable relays REL 1 and REL 2. (only with RT and "O" (open) = normally closed contact RT RS option) "C"...

  • Page 27: Parameterization

    Oxi 4000 Operation Parameterization 4.5.1 Calling up the parameterization level Call up the parameterization level from the operating level as follows: 1 Press <DOWN>. 2 Press <ENTER>. 3 The menu for the password prompt appears. When delivered, no password protection is set up. In this case proceed to the next operating step by pressing <ENTER>...

  • Page 28: Setting Table Of Parameterization

    Operation Oxi 4000 4.5.2 Setting table of parameterization Overview of the settings Instrument version (main level) Display Description Stan- RT RS dard Salinity equivalent Current output 1 Current output 2 Relay limits Air pressure Site altitude RS 485 interface Password protection...
  • Page 29 Oxi 4000 Operation Certain settings or choices depend on the instrument variant or specific configuration settings. Settings that are not available will be skipped. From any point of the main level press <ESC> to return to the starting point of the parameterization level. From here change to the operating level with <M>...
  • Page 30 Operation Oxi 4000 Setting Selection/Values Explanation (values in bold typeface = on delivery) Current range and attenuation of the REC 1 current output in rEC operating mode (operating mode rEC, (analog output). see Configuration) Operating notes: – The setting is carried out in the order: =1 ...
  • Page 31 Oxi 4000 Operation Setting Selection/Values Explanation (values in bold typeface = on delivery) (depending on the Settings for the REL 1 and REL 2 relays UL / LL REL 1/2 configuration) configured as limit indicators. The parameterization of the limit indicator is described in detail in section 4.7.
  • Page 32 Operation Oxi 4000 Setting Selection/Values Explanation (values in bold typeface = on delivery) 000 ... 999 Password against unintentional changes of configuration and parameterization. 000 = password protection is deactivated (state on delivery) Operating note: – Set the first (flashing) digit with <UP><DOWN>...
  • Page 33 Oxi 4000 Operation Setting Selection/Values Explanation (values in bold typeface = on delivery) (depending on the Timer settings for relays that are configured REL 1/2 configuration) as control relays for a sensor cleaning system. The timer settings are described in detail in section 4.7.

  • Page 34: Pid Controller

    Operation Oxi 4000 PID controller The monitor has an integrated PID controller. A free current output is used as controller output. The PID controller can be configured as a Proportional controller with a switchable Integral and Differential control algorithm (PID controller).
  • Page 35 Oxi 4000 Operation The following controller types can be configured by activation or deactivation of the Integral (ti) and Differential (td) algorithm: Controller type td [s] ti [s] P controller PI controller 1 to 9999 PD controller 1 to 9999...
  • Page 36 Operation Oxi 4000 Application example Regulation of the oxygen concentration Measuring range: 0.00 to 20.00 mg/l Control parameter Value 4 mg/l -30 % of the measurement range or - 6 mg/l Imin 8 mA Imax 14 mA 12 mA 0 s (no I algorithm)
  • Page 37 Oxi 4000 Operation Within the proportional range an increase of the concentration by 1 mg/ l causes a reduction of the output current by 1 mA. If the measured concentration is 5 mg/l, for example, 11 mA is output: −...

  • Page 38: Freely Configurable Relays (Rt And Rt Rs Option)

    Operation Oxi 4000 Freely configurable relays (RT and RT RS option) 4.7.1 Configuration Relay functions The two potential-free relays of the RT and RT RS instrument variants can be freely configured. The following functions are possible: Note The relay functions are selected in the configuration level under the setting Crc (see section 4.4.2).

  • Page 39: Limit Indicator

    Oxi 4000 Operation Function Description The relay is used as control output for a mg/l proportional controller with pulse width mg/l modulation. Whether an upper (UL) or lower (LL) limit is specified for the control is predefined with UL or LL (for details, see section 4.7.3).
  • Page 40 Operation Oxi 4000 Example: Measured Monitoring limiting value values using one or two relays Relay 1 Hysteresis UL Hysteresis LL Relay 2 Time Fig. 4-4 Switching points for relays with the function of a limit indicator Upper limit value (relay 1) exceeded...
  • Page 41 Oxi 4000 Operation Setting table for limit indicators: Setting Selection/Values Explanation UL or LL Any within the Upper or lower limit. measurement range Setting tolerance according to the measured value indication. Operating note: – Set the first (flashing) digit with <UP><DOWN>...

  • Page 42: Proportional Control With Relay

    Operation Oxi 4000 4.7.3 Proportional control with relay In a proportional controller a relay periodically switches on and off depending on the measured value. The switching signal (output signal of the controller) can be used as a manipulated variable for a control circuit, e.g.
  • Page 43 Oxi 4000 Operation Control with limits A limit is specified for control with a proportional controller. This limit can be an upper (UL = Upper Limit) or lower limit (LL = Lower Limit). If the limit is exceeded or undercut, the controller creates a signal (manipulated variable) which is proportional to the deviation from the limit.
  • Page 44 Operation Oxi 4000 The relay switches with a relative pulse width or frequency that increases with an increasing gap between the measured value and limit. This range is the proportional range of the controller. If the maximum relative pulse width (90 %) or frequency (variable) is reached, a greater gap between the measured value and limit does not lead to any further increase.
  • Page 45 Oxi 4000 Operation Setting table for proportional controllers - pulse width modulation: Setting Selection/Values Explanation UL or LL Depending on the Limit = measured value for minimum pulse measurement range width. Adjustment range for UL (upper limit): Measuring range Setting range 0.00 ...
  • Page 46 Operation Oxi 4000 Setting table for proportional controller - frequency modulation: Setting Selection/Values Explanation UL or LL Depending on the Limit = measured value for minimum measurement range frequency. Adjustment range for UL (upper limit): Measuring range Setting range 0.00 ... 20.00 mg/l 0.0 ...

  • Page 47: Timer For External Sensor Cleaning System

    Oxi 4000 Operation 4.7.4 Timer for external sensor cleaning system Function The cleaning function enables the timing of a sensor cleaning system through a relay of the monitor. The relay always works as a closer (normally open). Setting table for sensor cleaning:...

  • Page 48: Display Of The Relay States In The Operating Level

    Operation Oxi 4000 4.7.5 Display of the relay states in the operating level For an active relay the REL 1 or REL 2 status display appears in the operating level. Depending on the selected switching behavior the relay contact is either open or closed.
  • Page 49 Oxi 4000 Operation 2 Put the sensor into the calibrating position. To do this, position the sensor approx. 2 cm above a water surface, the best is a narrow mouthed bucket or similar vessel. No drops of liquid should get onto the membrane while doing so.

  • Page 50: Display Of Instrument Information

    Operation Oxi 4000 Display of instrument information The following information can be called up: Configuration data. For this, switch to the configuration level. If you press <ESC> during the password prompt, you can view all settings in view mode (see section 4.4.1 C ALL UP CONFIGURATION LEVEL Parameterization data.

  • Page 51: Test Mode

    Oxi 4000 Operation 4.10 Test mode General information Test mode can be used for the following purposes: Set specific current values on the current outputs for test purposes Switch the relays on and off for test purposes (RT and RT RS...
  • Page 52 Operation Oxi 4000 Test of current output 2 t s t (only for RT and RT RS option). 6 Press <ENTER>. REL1 REL2 Here a fixed current value can be set on current output 2: – Set 0.1 mA with <M>...
  • Page 53 Oxi 4000 Operation The tSt display flashes. The RS 485 communication test is active. The RS 485 interface works as a repeater, i.e. all received blocks are sent back again. Special commands: REL1 REL2 – The monitor sends the instrument identification according to the RS command "RSID"...
  • Page 54 Operation Oxi 4000 ba75750e01 07/2008...

  • Page 55: Maintenance And Cleaning

    Oxi 4000 Maintenance and cleaning Maintenance and cleaning Maintenance The measurement instrument is maintenance free. Cleaning Occasionally wipe the outside of the measuring instrument with a soft, damp cloth. CAUTION Do not use high-pressure water blasters for cleaning (danger of water penetration!).
  • Page 56 Maintenance and cleaning Oxi 4000 ba75750e01 07/2008...
  • Page 57 Oxi 4000 What to do if ... What to do if ... The oxygen sensor Cause Remedy cannot be activated – Contact problems – Check the sensor connections – Depleted electrolyte – Replace membrane head and refill (see sensor operating –...
  • Page 58 What to do if ... Oxi 4000 Measurement provides Cause Remedy implausible measured – Insufficient approach flow – Increase flow-through values Current output delivers Cause Remedy no current – On wiring with the flow control – Check the current output in test its switching threshold was mode (see section 4.10).

  • Page 59: Technical Data

    Oxi 4000 Technical data Technical data General data Dimensions Front view: Oxi 4000 mg/l ° REL1 Rear view: Side view: Fig. 7-1 Dimension drawing of the Oxi 4000 (dimensions in mm) Test certificates CE (for all supply voltages) ba75750e01 07/2008...
  • Page 60 Technical data Oxi 4000 Mechanical Housing material Fiberglass-reinforced polycarbonate construction Membrane keyboard Polyester Weight Approx. 2.2 kg Type of protection IP 66 Ambient conditions Temperature Operation - 25 °C ... + 55 °C (- 13 ... 131 °F) Storage - 25 °C ... + 65 °C (- 13 ... 149 °F) Relative humidity ≤...
  • Page 61 Oxi 4000 Technical data Terminals Connection technique Screwless push wire connections Connection cross 0.5 ... 2.5 mm section Cable feeds Cable glands in the housing bottom (from left to right): – 1x M16x1.5 / clamping area 4.5 ... 10 mm –...
  • Page 62 Technical data Oxi 4000 Current outputs Output Galvanically separated from the sensors Current range Adjustable: – 0 - 20 mA – 4 - 20 mA Accuracy 0.1 % of current value ± 50 µA, load max. 600 Ω Functions Programmable as: –...

  • Page 63: Oxygen Measurement

    Oxi 4000 Technical data Oxygen measurement Display and Adjustable: measuring range – 0.00 ... 20.00 mg/L Cl – 0.0 ... 200.0 % Resolution Depending on the measurement range: – 0.01 mg/l O – 0,1 % Accuracy 1 % of measured value ± 1 digit...
  • Page 64 Technical data Oxi 4000 ba75750e01 07/2008...

  • Page 65: Indexes

    Oxi 4000 Indexes Indexes This chapter provides additional information and orientation aids. List of display abbreviations (see section 8.1) Definition of terms (see section 8.2) Index (see section 8.3) Display abbreviations Configuration Password Starting point of the configuration level Salt content correction...
  • Page 66 Indexes Oxi 4000 RS 485 interface Password Temperature adjustment Cleaning system Parameterization Pulse width modulation Frequency modulation relay Upper limit Lower limit Hysteresis Switching delay Proportional range Period (Max.) Switching frequency Proportional range Cleaning interval Cleaning duration Adjustment duration Parameterization...

  • Page 67: Glossary

    Oxi 4000 Indexes Glossary The glossary briefly explains the meaning of the specialist terms. However, terms that should already be familiar to the target group are not described here. Amperometry Name of a measuring technique. The signal (depending on the measured parameter) of the probe is the electric current.
  • Page 68 Slope The slope of a linear calibration function. Slope (relative) Designation used by WTW in the D.O. measuring technique. It expresses the relation of the slope value to the value of a theoretical reference sensor of the same construction type.

  • Page 69: Index

    Index Oxi 4000 Index .....101 ........91 Air pressure compensation Operating level .........130 ........80 Ambient conditions Operational safety ..........94 ........83 Analog output Outdoor mounting .........80 Authorized use ......91 Parameterization level ........118 Calibration routine Password ........91 ........... 92, 97...
  • Page 70 Index Oxi 4000 ......117 Cleaning interval .......... 117 Function ........88 Sensor connection Setting table ........94 Configuration ....99 Parameterization (main level) . 117 Parameterization for sensor cleaning ..111 Parameterization of limit indicators Parameterization of proportional controller ..........
  • Page 72 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...

Table of Contents