Technical Information CPM280 ph/orp measurement Battery-driven pocket meter for ph and ORP measurement Application CPM280 is a pocket meter for measuring ph value and ORP. It is suitable for the following fields of application: Wastewater treatment plants Drinking and surface water Laboratory and field measurement Your benefits Comfortable operation: Clear multi-function display with user guidance Precise measurement: Automatic temperature compensation via the ph combination electrode with built-in temperature sensor (NTC 30) Flexible calibration: Conventional calibration with two buffer solutions Fully automatic two-point or three-point calibration with pre-defined buffer solutions according to DIN 19266 Fully automatic two-point or three-point calibration with Endress+Hauser quality buffer solutions Safe and cost-effective operation: Long service life with four commonly used 1.5 V batteries: approx. 3000 h Automatic power-down Dust and water-proof housing (IP 66) TI346C/07/en/11.08 71084903
Function and system design Measuring principle Measuring system! Note! ph measurement The ph value is used as a unit of measurement for the acidity or alkalinity of a liquid medium. The membrane glass of the electrode supplies an electrochemical potential which is dependent upon the ph value of the medium. This potential is generated by the selective penetration of H + ions through the outer layer of the membrane. An electrochemical boundary layer with an electric potential forms at this point. An integrated Ag/AgCl reference system serves as reference electrode. The transmitter converts the measured voltage into the corresponding ph value using the Nernst equation. Redox measurement The redox potential is a unit of measurement for the state of equilibria between oxidising and reducing components of a medium. Redox potential is measured similarly to the ph value. A platinum or gold electrode is used instead of ph-sensitive membrane glass. Analog to the ph measurement, an integrated Ag/AgCl reference system is used as a reference electrode. A complete measuring system comprises: CPM280 pocket meter Norylab CPS51 ph combination electrode with built-in temperature sensor NTC 30, fixed cable and water-proof DIN plug Plastic bowl for sampling You can use the supplied stand as a sensor holder. 1 2 Measuring system 1 Pocket meter 2 Sensor cable 3 Sensor 4 Plastic bowl 4 3 a0008900 2 Endress+Hauser
Input Measured variable Measuring range ph value or ORP [mv] ph value: -2 to 16 ORP: -1999 to +1999 mv Temperature: -5 to 100 C (20 to 212 F) Power supply Electrical connection via fixed cable and DIN plug Ref 1 2 3 Electrical connection 1 ph sensor connection 2 Temperature sensor connection 3 Reference electrode connection a0008105 Supply voltage Battery power Service life 4 x 1.5 V alkaline-manganese batteries, type AA approx. 3000 h Performance characteristics Reference operating conditions Reference temperature: Reference pressure: 25 C (77 F) 1013 hpa (15 psi) Maximum measured error Temperature compensation ph value: ORP: Temperature: -5 to 80 C (20 to 180 F) 0.01 ph ± 1 digit 0.3 mv ± 1 digit 0.1 K ± 1 digit Endress+Hauser 3
Environment Storage temperature 5 to +65 C (20 to 150 F) Ingress protection IP 66 Climate class climate class 2 Electromagnetic compatibility Interference emission acc. to DIN EN 50081-1 / 50081-2 Process Process temperature -5 to 80 C (20 to 180 F) Design, dimensions pocket meter Mechanical construction 80 (3.15) 38 (1.5) 80 (3.15) 172 (6.77) 38 (1.5) 35 (1.38) mm (inch) a0008905 4 Endress+Hauser
Design, dimensions case and sensor mm (inch) 355 (14.0) 115 (4.53) 305 (12.0) 120 (4.72) mm (inch) 12 (0.47) Case dimensions a0008909 Sensor dimensions a0008908 Weight Pocket meter Sensor Case, total weight 0.4 kg (0.9 lbs) 0.1 kg (0.2 lbs) 2.2 kg (4.9 lbs) Materials Pocket meter Housing: Keypad: Sensor Membrane glass: polypropylen (PP) silicone UNITEC Human interface Display elements 1 2 3 1 2 3 4 5 Measured value Status display Sensor symbol Temperature Displayed functions 5 4 LC display a0008484 Displayed functions LoBat TP AutoCal DIN AutoCal TEC CalError ARng AR Low battery Symbol of the temperature display Automatic calibration function, buffer solutions acc. to DIN 19266 Automatic calibration function, Endress+Hauser quality buffer ph 4, ph 7 Calibration error Autorange function on Autorange function off Endress+Hauser 5
Operating elements M CAL I AR M I CAL AR RUN/ ENTER Operation mode On/off Calibrate Autoread on/off (Hold function) Run/Enter RUN/ENTER Keypad a0008490 Ordering information Order number Scope of delivery ph/orp pocket meter CPM280 order no. 51510538 The measuring set comprises: 1 CPM280 pocket meter 1 Norylab CPS51 ph combination electrode with built-in NTC 30 temperature sensor, 1.5 m (4.9 ft) fixed cable and water-proof DIN plug 2 plastic bottles with buffer solutions ph 4 and ph 7, 50 ml (1.7 fl.oz) each 1 plastic bottle with electrolyte solution 3 mol/l KCl, 50 ml (1.7 fl.oz) 1 plastic bowl 50 ml (1.7 fl.oz) 1 stand used as electrode holder 4 alkali-manganese batteries 1.5 V 1 solid plastic case made from PP with integrated measuring point and separate pocket for sensor and accessories 1 Operating Instructions BA346C/07/b4 6 Endress+Hauser
Accessories and spare parts Sensor Calibration solutions Orbisint CPS51/CPS52 ph resp. ORP sensor with plastic shaft for pocket meter with built-in temperature sensor Order nos: CPS51-7EK2FDA (ph sensor) CPS52-0PK2FDA (ORP sensor) Technical buffer solutions for ORP electrodes +220 mv, ph 7.0, 100 ml (3.4 fl.oz.); order no. CPY3-0 +468 mv, ph 0.1, 100 ml (3.4 fl.oz.); order no. CPY3-1 High-quality buffer solutions of Endress+Hauser The secondary buffer solutions have been referenced to primary reference material of the PTB (German Federal Physico-technical Institute) and to standard reference material of NIST (National Institute of Standards and Technology) according to DIN 19266 by a DKD (German Calibration Service) accredited laboratory. ph value A ph 2.00 (accuracy ± 0.02 ph) C ph 4.00 (accuracy ± 0.02 ph) E ph 7.00 (accuracy ± 0.02 ph) G ph 9.00 (accuracy ± 0.02 ph) I ph 9.20 (accuracy ± 0.02 ph) K ph 10.00 (accuracy ± 0.05 ph) M ph 12.00 (accuracy ± 0.05 ph) Quantity 01 20 x 18 ml (0.68 fl.oz) only buffer solutions ph 4.00 and 7.00 02 250 ml (8.45 fl.oz) 10 1000 ml (0.26 US gal) 50 5000 ml (1.32 US gal) canister for Topcal S Certificates A Buffer analysis certificate Version 1 Standard CPY20- complete order code Endress+Hauser 7
Instruments International Endress+Hauser Instruments International AG Kaegenstrasse 2 4153 Reinach Switzerland Tel.+41 61 715 81 00 Fax+41 61 715 25 00 www.endress.com info@ii.endress.com TI346C/07/en/11.08 71084903 Printed in Germany / FM+SGML 6.0 / DT