Endress+Hauser liquisys CPM 252 Operating Instructions Manual
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Endress+Hauser liquisys CPM 252 Operating Instructions Manual

Endress+Hauser liquisys CPM 252 Operating Instructions Manual

Transmitter/controller for ph and redox
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BA 169C/07/en/04.98
No. 50087273
Software version 1.01 or later
liquisys
CPM 252
Transmitter/Controller
for pH and Redox
Operating Instructions
+
Endress
Hauser
Nothing beats know-how

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Summary of Contents for Endress+Hauser liquisys CPM 252

  • Page 1 BA 169C/07/en/04.98 liquisys No. 50087273 Software version 1.01 or later CPM 252 Transmitter/Controller for pH and Redox Operating Instructions Endress Hauser Nothing beats know-how...
  • Page 2 Please familiarise yourself with the instrument before you take any other steps: General information Safety Description You wish to install and start up the instrument. The required steps are described in these chapters: Installation First start-up You wish to operate or reconfigure the instrument. The operating concept is explained in these chapters: Operation Instrument configuration...

  • Page 3: Table Of Contents

    CPM 252 Table of contents Table of contents General information ....... . . 2 Symbols used .

  • Page 4: General Information

    Note: This symbol indicates important items of information. Conformity statement The pH and redox measuring instrument / controller Liquisys CPM 252 has been developed and manufactured in accordance with the applicable European standards and directives. Note: The corresponding certificate of conformity may be requested from Endress+Hauser.

  • Page 5: Safety

    Installation, start-up, operation The Liquisys CPM 252 instrument has been designed for safe operation according to the state of the art in engineering and in keeping with the applicable regulations and EC directives; see “Technical data”.

  • Page 6: Description

    Description liquisys CPM 252 Description Areas of application The measuring transmitter Liquisys CPM 252 is suitable for measuring and control tasks in the following areas of application: Water treatment and water monitoring Effluent treatment Neutralisation Detoxification in the electroplating industry...

  • Page 7: Important Features

    Liquisys CPM 252 measuring transmitter Important features Field housing with protection type IP 65 Measuring range pH 0 ... 14 / ± 1000 mV Switching between pH and redox potential measurements Temperature measurement -9.9 ...

  • Page 8: Instrument Variants

    Base version Moisture protection lacquering ⇐ complete order code CPM 252- You can identify the device variant and the mains supply type by the order code on the nameplate of the instrument. Fig. 3.2 Nameplate of Liquisys CPM 252 Endress+Hauser...

  • Page 9: Accessories

    CPM 252 Description Accessories Endress+Hauser offer a wide selection of matching electrodes and assemblies for the Liquisys measuring instrument which are designed for special applications. An overview of these ap- pears below. Electrodes Type Features Areas of application General process...
  • Page 10 Description liquisys CPM 252 Assemblies Type Features Areas of application Immersion assembly with DN 100 flange, Open and closed bayonet mounting for fast electrode installation containers and tanks Dipsys and removal, integration of Chemoclean CPA 111 electrode cleaning system is possible without...

  • Page 11: Installation

    Save the original packaging in case the device must be stored or shipped at a later time. If you have any questions, please consult your supplier or the Endress+Hauser sales office in your area (see back cover of these operating instructions for addresses).

  • Page 12: Mounting

    Installation liquisys CPM 252 Mounting Wall mounting of Liquisys CPM 252 in field housing ∅ 6 mm Mounting screw: ∅ 8 mm Anchor: Fig. 4.1 Wall mounting of Liquisys CPM 252 Post mounting of Liquisys CPM 252 in field housing Additional requirements: post mounting kit (see Mounting accessories).
  • Page 13 CPM 252 Installation Caution: Weather protection cover CYY 101 (see Mounting accessories) is to be used for outdoor installation. The protection cover is suitable for wall or post mounting. Mounting accessories Weather protection cover CYY 101 Weather protection cover for outdoor use of instrument, to be installed on field housing.

  • Page 14: Connection

    Installation liquisys CPM 252 Connection Warning: The connection to the mains may only be established by properly trained specialist personnel. Do not perform service work on the instrument while the instrument is energised. The instrument must be grounded before start-up! A clearly identified mains disconnecting device must be installed close to the instrument.
  • Page 15 Signal output 2 Temperature Fig. 4.6 Electrical connection of Liquisys CPM 252 Caution: Do not connect the two signal outputs with each other! If you want to connect them both to a PLC with common ground of all inputs, then you must anew isolate one output galvanically.
  • Page 16 Installation liquisys CPM 252 Connection of pH and redox electrodes Special pre-assembled and shielded multi-core measuring cables of types CPK 1 to CPK 7 (see section “Special pH / redox measuring cables”) are used to connect pH and redox electrodes.
  • Page 17 CPM 252 Installation Special pH / redox measuring cables Ref. Coax bk CPK 1 Outer screen PA / PM Fig. 4.9 Measuring cable CPK 1 Type: Coaxial cable with auxiliary core and additional outer screen, in PVC sheath, ∅ 7.2 mm; extension: CYK 71, order no. 50085333...
  • Page 18 Installation liquisys CPM 252 Cable installation gn/ge gn/ye Fig. 4.12 Screen connection for CPK 1, CPK 7 Install the ready-made special measuring cable as shown in figure 4.12: Insert the cable through a Pg cable gland into the wiring space.

  • Page 19: Packaging And Disposal

    CPM 252 Installation Connection accessories Junction box VBA Mounting hole Junction box for connection cables over 20 m long between assembly and transmitter. Comes with 4 Pg cable glands for cable entry (Pg 13.5 and Pg 16) and 10 high-impedance...

  • Page 20: First Start-Up

    First start-up liquisys CPM 252 First start-up Measures before first power-up Note: Familiarise yourself with the operation of the measuring instrument before switching it on for the first time! Caution: Before power-up, check that all connections have been properly made! Make sure that the electrode is immersed in the medium to be measured or a buffer solution.

  • Page 21: Power-Up, Factory Settings

    CPM 252 First start-up Power-up, factory settings After power-up, the instrument performs a self-test and then starts up in the measuring mode. If the display is similar to figure 5.1, the instrument is functioning properly. The measured values shown on the display may be different.

  • Page 22: First Configuration And Calibration

    CPM 252 First configuration and calibration The measuring transmitter Liquisys CPM 252 is pre-configured as a pH measuring instrument. If it is to be operated as a redox instrument, its configuration must be changed as described in chapter 7.6 before the first calibration.

  • Page 23: Operation

    / instrument configuration manual operation Fig. 6.1 Operating elements of Liquisys CPM 252 Display elements LED indicators Indication for relay controlled in “manual” mode (red LED). Indication for “auto” (green LED) or “manual” (yellow LED) mode.
  • Page 24 In setup / calibr. mode e.g. parameter setting Electrode symbol, “Buffer solution” symbol, Temperature compensation flashes during requests buffer solutions for ongoing calibration calibration values 1 and 2 type display Fig. 6.2 Liquid crystal display of Liquisys CPM 252 Endress+Hauser...

  • Page 25: Key Functions

    CPM 252 Operation Key functions Quick calibration After pressing the CAL key and entering the calibration code (11), the instrument shows the display for the first calibration step. The CAL key is further used for control- ling the entire calibration.

  • Page 26: Operating Concept

    Operation liquisys CPM 252 Operating concept Operating modes Measuring mode Standard mode of operation, display of current measured values Code: Setup mode Read mode Quick calibration mode Access to all configuration All settings can be read Execution of calibration and calibration menus.
  • Page 27 CPM 252 Operation Menu structure The configuration and calibration functions are arranged in a menu structure by function groups. Note: See the fold-out back page of these operating instructions for an overview of the Liquisys menu structure. The function groups are selected in the setup mode with the ‘+‘ and ‘–‘ keys.

  • Page 28: Operation Example

    Operation liquisys CPM 252 Hold function: ”freezing” of outputs The current output is “frozen” in the setup mode and during quick calibration, i.e. the last current value is constantly output. The display shows the “HOLD” message. During automatic operation, all contacts will go to their normal positions. Any alarm delay accumulated will be reset to ‘0’.
  • Page 29 CPM 252 Operation Select the “setpoint entry” function. Change the setting, e.g. from 10 pH to 12 pH. Confirm the entry. The instrument advances to the next function. Change the factory setting of ”Hi” (upper limit = Max Function) to ”Lo”...

  • Page 30: Auto / Manual Mode Of Operation

    Operation liquisys CPM 252 Select the “Setup Code” field. Change the code (to any number) to block the access to the configuration function. Confirm the (blocking) code entry. The instrument returns to the measuring mode. Auto / manual mode of operation Automatic operation In this mode of operation, the relays are controlled by the measuring transmitter.
  • Page 31 CPM 252 Operation Note: The manual mode must be enabled by entering setup code “22”. The current operating mode setting is retained even in the event of a power failure. The manual mode has precedence over an external hold request.

  • Page 32: Instrument Configuration

    Instrument configuration liquisys CPM 252 Instrument configuration Offset adjustment This function group is used to change the offset and thus shift the electrode characteristic (pH only). The setting range is approx. +/– 2 pH at 25 °C. Secondary display: current measured value ± offset value.

  • Page 33: Selection Of Temperature Compensation

    CPM 252 Instrument configuration Selection of temperature compensation This function group is used to select the temperature compensation type and to calibrate the Pt 100 sensor. Note: This function group is not displayed during redox operation. Field Selection / range...

  • Page 34: Limit Contactor Configuration

    Instrument configuration liquisys CPM 252 Limit contactor configuration These function groups are used to configure the limit parameters. Programming for limits 1 and 2 is identical; therefore both function groups are covered by this description. Note: If the controller function is disabled in the “Controller” function group, the “Setpoint 1”...

  • Page 35: Controller Configuration

    This function group is used for controller configuration. These settings affect both controllers. General notes on setting the controllers The relays of the Liquisys CPM 252 measuring transmitter can be configured to function as a limit contactor or as a proportional controller.
  • Page 36 Instrument configuration liquisys CPM 252 Two types of proportional controllers can be distinguished by the signal pulse they output: Pulse length controller: Far from the setpoint, the relay is picked up for a longer time. Close to the setpoint, the relay is picked up for a shorter time.
  • Page 37 CPM 252 Instrument configuration Field Selection / range Display Info Determines the controller type for controller / limit contactor If oFF is L.Ct 1 / 2 selected, the (tYP = controller type) following (oFF = controller off) functions are (L.Ct = limit contactor)

  • Page 38: Current Output Measuring Range Selection

    Instrument configuration liquisys CPM 252 Current output measuring range selection This function group is used to determine the measuring range for the current output. Field Selection / range Display Info Toggles the lower limit of the 0 – 20 Applies to current output between 0 and 4 –...

  • Page 39: General Instrument Configuration

    CPM 252 Instrument configuration Note: Falling assignments are possible (e.g. 4 mA → 12 pH, 20 mA → 6 pH), the pH difference must be at least ∆1 pH, and the temperature difference must be no less than 10 % of the upper temperature range value.

  • Page 40: Calibration Of Measuring Transmitter

    Instrument configuration liquisys CPM 252 Field Selection / range Display Info GLAS Sets the electrode type to After each glass or antimony. change, the AntY factory This field is not available in calibration data the redox mode. for zero and...
  • Page 41 CPM 252 Instrument configuration pH calibration During the calibration with manual temperature compensation, the instrument automatically switches from the preset process to the calibration temperature. The instrument switches back to the process temperature upon leaving the “Calibration” function group (refer to chapter 7.2 for setting the two temperature values).
  • Page 42 Instrument configuration liquisys CPM 252 Redox - % calibration For calibration, medium samples are placed in two containers. The contents of the first container are detoxified. The contents of the second container remain unchanged. Note: The calibration range is ± 1000 mV, the minimum difference 60 mV.
  • Page 43 CPM 252 Instrument configuration Redox - mV calibration The measuring instrument has a calibrated mV display range. An absolute mV value is set with a single buffer solution (adaptation of measuring chain offset). A buffer solution chosen by the user, preferably for 225 or 475 mV, is used.

  • Page 44: Diagnostics

    Diagnostics liquisys CPM 252 Diagnostics Warning: Alarm signalling devices must have an independent power supply to permit alarm signalling in the event of a power failure! Alarm An alarm condition exists when the measured value – exceeds the upper limit or –...
  • Page 45 Hold function is activated If the system error cannot be eliminated by switching the power supply to the instrument off and back on, the instrument must be sent to the competent Endress+Hauser sales agency for servicing. Error message in the event of AD converter overflow Effect: ”ERR”...

  • Page 46: Possible Faults In Measuring Mode And Elimination

    Diagnostics liquisys CPM 252 Possible faults in measuring mode and elimination Cause Analysis / remedy Measuring chain zero point cannot be adjusted Connect another combination electrode or Reference system poisoned or diaphragm reference electrode; possibly clean or grind blocked down diaphragm.
  • Page 47 CPM 252 Diagnostics Cause Analysis / remedy Stable but incorrect display value Measuring chain not immersed in medium or Check calibration with buffer solution. air cushion (foam) in flow assembly Zero can be adjusted when measuring buffer solution, but immediately drifts in a grounded Short to ground in or on instrument medium.

  • Page 48: Maintenance And Service

    Further repairs Further repairs may only be carried out directly by the manufacturer or through the Endress+ Hauser service organisation. An overview of the Endress+Hauser service network can be found on the back cover of these operating instructions. Endress+Hauser...

  • Page 49: Appendix

    CPM 252 Appendix Appendix 10.1 Technical data pH measurement Measuring range (MR) ....... . pH 0 ... 14 Display range .
  • Page 50 Appendix liquisys CPM 252 Temperature measurement Temperature sensor ......Pt 100 (3-wire connection) Measuring range / ATC range ......
  • Page 51 CPM 252 Appendix General technical data Measured value display ..LC display, two lines, 4 and 3½ digits, with status indicators Electromagnetic compatibility (EMC) Emission ......acc. to EN 50081-1:1992 Immunity .

  • Page 52: 10.2 Index

    Appendix liquisys CPM 252 10.2 Index Access code ....3 Electrical connection ..12, 13 Accessories .
  • Page 53 CPM 252 Appendix Mains disconnecting device ..12 Safety devices ....Mains supply ....6 Safety notes .
  • Page 54 Appendix liquisys CPM 252 Display Abbreviation for Meaning Page alarm contact Alarm contact alarm delay Alarm delay antimony electrode Antimony electrode Asymmetrical electrode asymmetric connection automatic temperature Autom. temperature compensation compensation calibration °C Calibration temperature cal 1 Redox sample 1...
  • Page 55 CPM 252 Appendix Display Abbreviation for Meaning Page hysteresis Hysteresis limit contactor Limit contactor Min. limit Do not set defaults off delay Dropout delay off (controller / ATC) Controller / ATC off 31 , 35 offset Offset Controller / ATC on...
  • Page 56 Appendix liquisys CPM 252 Display Abbreviation for Meaning Page relay Relay function Function group ‘Measuring range range’ setup code Setup code Function group set temperature °C ‘Temperature compensation’ setpoint 1 Limit 1 setpoint 2 Limit 2 steady Steady contact Symmetrical electrode...
  • Page 57 Appendix liquisys CPM 252 Measuring mode Menu structure (normal operation) The display screens shown in this overview are examples and may be different during operation. Caution: In the case of function groups marked with an asterisk , all settings are reset to the defaults when switching between pH and redox measurement! + wrong...
  • Page 58 Tel. (022) 6 04 55 78, Fax (022) 6 04 02 11 Tel. (0 32) 85 10 85, Fax (0 32) 85 11 12 Indonesia Poland PT Grama Bazita Endress+Hauser Polska Sp. z o.o. Jakarta Warsaw All other countries Tel. (021) 7 97 50 83, Fax (021) 7 97 50 89 Tel.

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