Endress+Hauser Liquisys M CPM253 Brief Operating Instructions
Transmitter for ph and orp measurement with analog sensors
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- Operating instructions manual (112 pages)
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Summary of Contents for Endress+Hauser Liquisys M CPM253
- Page 1 Products Solutions Services KA01763C/07/EN/01.25-00 71712526 2025-06-30 Brief Operating Instructions Liquisys M CPM253 Transmitter for pH and ORP Measurement with analog sensors...
- Page 2 Table of contents Liquisys M CPM253 Table of contents About this document ............. . 3 Safety information .
- Page 3 Liquisys M CPM253 About this document About this document Safety information Structure of information Meaning This symbol alerts you to a dangerous situation. DANGER Failure to avoid the dangerous situation will result in a fatal or serious injury. Causes (/consequences)
- Page 4 Basic safety instructions Liquisys M CPM253 Basic safety instructions Requirements for the personnel • Installation, commissioning, operation and maintenance of the measuring system may be carried out only by specially trained technical personnel. • The technical personnel must be authorized by the plant operator to carry out the specified activities.
- Page 5 Liquisys M CPM253 Incoming acceptance and product identification Operational safety Before commissioning the entire measuring point: Verify that all connections are correct. Ensure that electrical cables and hose connections are undamaged. Procedure for damaged products: Do not operate damaged products, and protect them against unintentional operation.
- Page 6 Incoming acceptance and product identification Liquisys M CPM253 Check the technical documentation and all other necessary documents, e.g. certificates, to ensure they are complete. If one of the conditions is not satisfied, contact the manufacturer. Scope of delivery • 1 transmitter CPM253 •...
- Page 7 Liquisys M CPM253 Installation 3.3.3 Nameplate The nameplate provides you with the following information on your device: • Manufacturer identification • Order code • Extended order code • Serial number • Ambient and process conditions • Input and output values •...
- Page 8 Installation Liquisys M CPM253 11 0.43 70 2.76 115 4.53 154 6.06 170 6.69 A0059137 2 Dimensions There is a hole in the perforation for the cable entry (connection of supply voltage). It serves as a pressure balance during air shipment. Make sure no moisture penetrates the inside of the housing before the cable installation.
- Page 9 Liquisys M CPM253 Installation A0059154 3 View into the field housing Removable electronics box Fuse Terminals Partition plate Installing the device Options for securing the field housing: • Wall mounting with fixing screws • Post mounting to cylindrical pipes •...
- Page 10 Installation Liquisys M CPM253 4.2.1 Wall mounting Ø 6 0.24 154 6.06 A0059157 4 Wall mounting Fixing bore holes Plastic caps Drill the bore holes as illustrated in . Drive two fixing screws through the fixing bore holes (1) from the front.
- Page 11 Liquisys M CPM253 Electrical connection Proceed as follows to mount the transmitter on a post: Guide the two securing screws (1) of the mounting kit through the openings on the securing plate (3). Screw the securing plate onto the transmitter using the four fixing screws (2).
- Page 12 Electrical connection Liquisys M CPM253 Connecting the device WARNING Risk of electric shock! ‣ At the supply point, the power supply must be isolated from dangerous live cables by double or reinforced insulation in the case of devices with a 24 V power supply.
- Page 13 Liquisys M CPM253 Electrical connection Ref. DRN. 23 + 24 - 10-50 V 10-50 V 15 V A0059017 7 Electrical connection of the transmitter without Memosens functionality Standard sensor Auxiliary voltage output ISFET sensor Alarm (current-free contact position) Outer shield connection with glass electrodes...
- Page 14 Electrical connection Liquisys M CPM253 Observe the following: • The device is approved for protection class II and is generally operated without a protective ground connection. • To guarantee measuring stability and functional safety, you must ground the outer shield of the sensor cable: •...
- Page 15 Liquisys M CPM253 Electrical connection 5.2.2 Measuring cables and sensor connection Special shielded measuring cables are required to connect pH and ORP electrodes to the transmitter. The following multi-core, pre-terminated cable types are possible: Sensor type Cable Extension Electrode without temperature sensor...
- Page 16 Electrical connection Liquisys M CPM253 Coax Ref. CPK1 pH or Redox pH / Redox BN PM BN PM CPK2 pH or Redox pH or Redox RD Redox or Ref. Ref. or Redox BU Ref. Pt 100 GN Temp. Temp. WH Temp.
- Page 17 Liquisys M CPM253 Electrical connection Connection examples The following diagrams show the connection of various pH and ORP sensors. ϑ 11 12 13 11 12 13 Redox innen / GN WH YE GN WH YE RD innen / internal internal...
- Page 18 Electrical connection Liquisys M CPM253 BN BNC CPK1 CPK1 CPS12 CPS12 A0027566 11 Asymmetrical (without PML) and symmetrical (with PML) connection of ORP electrodes Panel-mounted device Field device Potential matching (PM) in the medium for symmetrical connection The pH and ORP sensors can be connected both symmetrically and asymmetrically. Generally, the following applies: •...
- Page 19 Liquisys M CPM253 Electrical connection Advantages of symmetrical vs. asymmetrical: • Symmetrical measurement: • No leak current since the reference and the pH/ORP electrode is connected with high impedance • Reliable measurement under difficult process conditions (strong flowing and high- impedance media, partially soiled junction) •...
- Page 20 Operation options Liquisys M CPM253 Electrical connection Notes Are all the cable entries fitted, tightened and leak-proof? Are the PE distributor blocks grounded (if present)? Grounding is carried out at the point of installation. Operation options Overview of operation options Options for controlling the transmitter: •...
- Page 21 Liquisys M CPM253 Operation options Indicates the working status of relay 1 and 2 LED green: measured value within the permitted limit, relay inactive LED red: measured value outside the permitted limit, relay active A0027221 Alarm display, e.g. in event of continuous limit value overshoot,...
- Page 22 Operation options Liquisys M CPM253 Operating elements The display shows the current measured value and the temperature simultaneously. This provides you with the most important process data at a glance. Help text in the configuration menu helps users configure the device parameters.
- Page 23 Liquisys M CPM253 Operation options Functions of keys CAL key When you press the CAL key, the device first prompts you for the calibration access code: A0027235 • Code 22 for calibration • Code 0 or any other code for reading the last calibration data Use the CAL key to accept the calibration data or to switch from field to field within the calibration menu.
- Page 24 Operation options Liquisys M CPM253 PLUS key and MINUS key In the Setup mode, the PLUS and MINUS keys have the following functions: • Selection of function groups. Press the MINUS key to select the function groups in the order given in the "System configuration"...
- Page 25 Liquisys M CPM253 Operation options Access to operating menu via local display 6.3.1 Automatic/manual mode The transmitter normally operates in automatic mode. Here, the relays are triggered by the transmitter. In the manual mode, you can trigger the relays manually using the REL key or start the cleaning function.
- Page 26 Operation options Liquisys M CPM253 Switch relays. The relay is switched on with PLUS and switched off with MINUS. The relay remains in this switched state until it is switched again. A0027240 Press the AUTOMATIC key to return to the measuring mode, i.e.
- Page 27 Liquisys M CPM253 Operation options • CAL key + code 22: access to Calibration and Offset menu • ENTER key + code 22: access to the menus for the parameters which make configuration and user-specific settings possible • PLUS + ENTER keys simultaneously (min. 3 s): lock the keyboard •...
- Page 28 Commissioning Liquisys M CPM253 Commissioning Specificities of commissioning ISFET sensors Switch-on behavior A closed-control loop is created when the measuring system is switched on. The measured value adjusts to the real value during this time (approx. 5 to 8 minutes). This settling behavior occurs every time the liquid film between the pH-sensitive semiconductor and the reference lead is interrupted (e.g.
- Page 29 Liquisys M CPM253 Commissioning • SERVICE (S) • E+H SERVICE (E) • INTERFACE (I) Calibration and offset mode • CALIBRATION (C) • NUMERIC (N) • OFFSET (V) For a detailed explanation of the function groups available in the transmitter, see the "Device configuration"...
- Page 30 Commissioning Liquisys M CPM253 User entry Range of Display adjustment (factory settings in bold) Press the MINUS key until the "Service" function group is displayed. Press the ENTER key to make the required settings. SERVICE A0008408-EN In S1, select the language, e.g. "ENG" for English.
- Page 31 Liquisys M CPM253 Commissioning User entry Range of Display adjustment (factory settings in bold) In A4, specify the type of sensor used, e.g. "Glass" for Glass glass electrode. ISFET Confirm the entry by pressing the ENTER key. Glass Sensor A0007828-EN...
- Page 32 Commissioning Liquisys M CPM253 User entry Range of Display adjustment (factory settings in bold) The difference between the measured and entered 0.0 °C temperature is displayed. -5.0 to 5.0 °C ¡ Press the ENTER key. The display returns to the initial display of the "Setup 2"...
- Page 36 *71712526* 71712526 www.addresses.endress.com...
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