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Endress+Hauser pH/ORP sensor CPF81D-7LH11

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Orbipac CPF81D/CPF82D and CPF81/CPF82

pH/ORP sensors, with digital Memosens technology or analog

For mining operations, industrial water and wastewater treatment

Application

• Flotation

• Leaching

• Neutralization

• Outlet monitoring

Your benefits

• With patented KNO3 electrolyte bridge for improved protection against electrode

poisons such as S2- or CN- ions

• Optionally available with flat membrane for improved wear resistance

• Threaded connection NPT ¾" top and bottom for easy installation at user end

• Suitable for measurements in the 0 to 14 pH range and in the 0 to 110 °C

(32 to 230 °F) temperature range

• Digital pH sensors with integrated temperature sensor, analog pH sensors with or

without integrated temperature sensor

• Protection guard against damage

Other advantages provided by Memosens technology

• Maximum process safety

• Data security thanks to digital data transmission

• Very easy to use as sensor data are saved in the sensor

• Predictive maintenance can be performed by recording sensor load data in the sensor

Function and system design

Measuring principle

pH measurement

The pH value is used as a unit of measurement for the acidity or alkalinity of a medium. The

membrane glass of the electrode delivers an electrochemical potential that depends on the pH value

of the medium. This potential is generated by the selective accumulation of H+ ions on the outer

layer of the membrane. As a result, an electrochemical boundary layer with an electrical potential

difference forms at this point. An integrated Ag/AgCl reference system serves as the required

reference electrode.

The measured voltage is converted to the corresponding pH value using the Nernst equation.

ORP measurement

The ORP potential is a unit of measurement for the state of equilibria between oxidizing and

reducing components of a medium. The ORP is measured using a platinum or gold electrode. Analog

to the pH measurement, an integrated Ag/AgCl reference system is used as a reference electrode.

Measuring system

A complete measuring system comprises:

• Sensor CPF81D, CPF81, CPF82D or CPF82

• Transmitter, e.g. Liquiline CM44x/R or Liquiline M CM42

• Measuring cable, e.g. CYK10 or sensor fixed cable

Endress+Hauser CPF81D-7LH11

	Basic model
	Orbipac CPF81D Memosens
	Version:
7	basic version
	Application range:
LH	0-14pH; 0-110oC
	Insertion length:
1	23mm + electrode guard
	Approval:
1	non hazardous area

Communication and data transmission

Communication with the transmitter

Always connect digital sensors with Memosens technology to a transmitter with Memosens

technology. Data transmission to a transmitter for analog sensors is not possible.

Digital sensors can store measuring system data in the sensor. These include the following:

• Manufacturing data

• Serial number

• Order code

• Date of manufacture

• Calibration data

• Calibration date

• Calibrated slope at 25 °C (77 °F) (CPF81D)

• Calibrated zero point at 25 °C (77 °F) (CPF81D)

• Calibrated offset (CPF82D, ORP mV measuring mode)

• Slope as % (CPF82D, ORP % measuring mode)

• Temperature offset

• Number of calibrations

• Serial number of the transmitter used for the last calibration

• Calibration database (stores the last 8 calibrations in the Memosens head)

• Application data

• Temperature application range

• pH application range (CPF81D)

• ORP application range (CPF82D)

• Date of first commissioning

• Maximum temperature value

• Operating hours at temperatures above 80 °C (176 °F) and 100 °C (212 °F)

• Operating hours at very low and very high pH values (Nernst voltage below -300 mV, above

+300 mV)

Input

Measured values	CPF81D and CPF81 pH value Temperature CPF82D and CPF82 ORP
Measuring range	CPF81D and CPF81 Version LH • pH: 0 to 14 • Temperature: 0 to 110 °C (32 to 230 °F) Version NN • pH: 0 to 14 (11 to 14 with reduced accuracy) • Temperature: 0 to 80 °C (32 to 176 °F) CPF82D, CPF82 -1500 mV to +1500 mV
	Power supply
Electrical connection	CPF81D and CPF82D The electrical connection to the transmitter is established using measuring cable CYK10.

	CPF81 and CPF82 with TOP68 plug-in head

	CPF81 and CPF82 with fixed cable

	Installation
Installation instructions	• Before screwing in the sensor, make sure the assembly thread, the O-rings and the sealing surface are clean and undamaged and that the thread runs smoothly. • Pay attention to the installation instructions provided in the Operating Instructions of the assembly used. ‣ Screw in the sensor and tighten by hand with a torque of 3 Nm (2.21 lbf ft) (specifications only apply if installing in Endress+Hauser assemblies).


	Mechanical construction
Design, dimensions	ntegrated preamplifier (optional) Structure cast in sensor body Power supply via integrated coin cells Reference potential: reference electrode
Dimensions	CPF81D, CPF82D

	CPF81, CPF82