BA01572C/07/EN/03.20
71478132
2020-04-27
Products Solutions Services
Operating Instructions
pH/ORP sensors and reference
half cells
Sensors with Memosens technology and analog
sensors
About this document pH/ORP sensors and reference half cells
1 About this document
1.1 Warnings
Structure of information Meaning
DANGER
L
Causes (/consequences)
If necessary, Consequences of noncompliance (if applicable)
Corrective action
‣
WARNING
L
Causes (/consequences)
If necessary, Consequences of noncompliance (if applicable)
Corrective action
‣
CAUTION
L
Causes (/consequences)
If necessary, Consequences of noncompliance (if applicable)
Corrective action
‣
NOTICE
Cause/situation
If necessary, Consequences of noncompliance (if applicable)
Action/note
‣
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation will result in a fatal or serious injury.
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation can result in a fatal or serious injury.
This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or more serious injuries.
This symbol alerts you to situations which may result in damage to property.
1.2 Symbols used
Symbol Meaning
Additional information, tips
Permitted or recommended
Not permitted or not recommended
Reference to device documentation
Reference to page
Reference to graphic
Result of a step
2 Endress+Hauser
pH/ORP sensors and reference half cells About this document
1.2.1 Symbols on the device
Symbol Meaning
Reference to device documentation
1.3 Documentation
The following manuals which complement these Operating Instructions can be found on the
product pages on the Internet:
• Technical Information for the relevant sensor
• Operating Instructions for the transmitter used
In addition to these Operating Instructions, an XA with "Safety instructions for electrical
apparatus in the hazardous area" is also included with sensors for use in the hazardous area.
Please follow instructions on use in the hazardous area carefully.
‣
Safety instructions for electrical apparatus in hazardous area, Memosens pH/ORP
sensors, XA00376C
Safety instructions for electrical apparatus in hazardous area, analog pH/ORP sensors,
XA00028C
Safety instructions for electrical apparatus in hazardous area, Memosens pH/ORP
sensors, XA01437C
Safety instructions for electrical apparatus in hazardous area, Memosens pH/ORP
sensors, XA00079C
Safety instructions for electrical apparatus in hazardous area, analog pH/ORP sensors,
XA01440C
Endress+Hauser 3
Basic safety instructions pH/ORP sensors and reference half cells
2 Basic safety instructions
2.1 Requirements for 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.
• The electrical connection may be performed only by an electrical technician.
• The technical personnel must have read and understood these Operating Instructions and
must follow the instructions contained therein.
• Faults at the measuring point may only be rectified by authorized and specially trained
personnel.
Repairs not described in the Operating Instructions provided must be carried out only
directly at the manufacturer's site or by the service organization.
2.2 Designated use
The CPSx1D, CPSx1, CPS1x1D, CPFx1D and CPFx1 sensors are designed for the continuous
measurement of the pH value in liquids.
The CPSx2D, CPSx2, CPFx2D and CPFx2 sensors are designed for the measurement of the
oxidation-reduction potential (ORP) in liquids.
Together with the CPSx3 reference half cells, the CPSx4 and CPSx5 half cells are designed for
the measurement of the pH value (CPSx4) or the ORP (CPSx5) in liquids.
A list of recommended applications is provided in the Technical Information for the
relevant sensor.
Use of the device for any purpose other than that described, poses a threat to the safety of
people and of the entire measuring system and is therefore not permitted.
The manufacturer is not liable for damage caused by improper or non-designated use.
2.3 Workplace safety
As the user, you are responsible for complying with the following safety conditions:
• Installation guidelines
• Local standards and regulations
• Regulations for explosion protection
2.4 Operational safety
Before commissioning the entire measuring point:
1. Verify that all connections are correct.
2. Ensure that electrical cables and hose connections are undamaged.
3. Do not operate damaged products, and protect them against unintentional operation.
4. Label damaged products as defective.
4 Endress+Hauser
pH/ORP sensors and reference half cells Incoming acceptance and product identification
During operation:
If faults cannot be rectified:
‣
products must be taken out of service and protected against unintentional operation.
2.5 Product safety
2.5.1 State-of-the-art technology
The product is designed to meet state-of-the-art safety requirements, has been tested, and
left the factory in a condition in which it is safe to operate. The relevant regulations and
international standards have been observed.
3 Incoming acceptance and product identification
3.1 Incoming acceptance
1. Verify that the packaging is undamaged.
Notify the supplier of any damage to the packaging.
Keep the damaged packaging until the issue has been resolved.
2. Verify that the contents are undamaged.
Notify the supplier of any damage to the delivery contents.
Keep the damaged goods until the issue has been resolved.
3. Check that the delivery is complete and nothing is missing.
Compare the shipping documents with your order.
4. Pack the product for storage and transportation in such a way that it is protected
against impact and moisture.
The original packaging offers the best protection.
Make sure to comply with the permitted ambient conditions.
If you have any questions, please contact your supplier or your local Sales Center.
3.2 Product identification
3.2.1 Nameplate
The nameplate provides you with the following information on your device:
• Manufacturer details
• Order code
• Serial number
• Operating conditions
• Safety information and warnings
Compare the information on the nameplate with the order.
‣
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Incoming acceptance and product identification pH/ORP sensors and reference half cells
3.2.2 Identifying the product
Interpreting the order code
The order code and serial number of your product can be found in the following locations:
• On the nameplate
• In the delivery papers
Obtaining information on the product
1. Go to www.endress.com.
2. Call up the site search (magnifying glass).
3. Enter a valid serial number.
4. Search.
The product structure is displayed in a popup window.
5. Click on the product image in the popup window.
A new window (Device Viewer) opens. All of the information relating to your
device is displayed in this window as well as the product documentation.
3.2.3 Manufacturer's address
Endress+Hauser Conducta GmbH+Co. KG
Dieselstraße 24
D-70839 Gerlingen
or
Endress+Hauser Conducta Inc.
4123 East La Palma Avenue, Suite 200
Anaheim, CA 92807 USA
3.3 Storage and transport
All sensors are individually tested and supplied in individual packs. The sensors are provided
with a protection cap. The cap contains a special liquid that prevents the sensor from drying
out.
Do not allow the sensor to dry out, as this can result in permanent measurement errors.
Sensors must be stored in dry rooms at temperatures of 0 to 50 °C (32 to 122 °F).
NOTICE
Freezing of internal buffer and inner electrolyte!
The sensors can crack at temperatures lower than -15 °C (5 °F).
If transporting the sensors, make sure to package them so they are appropriately protected
‣
against frost.
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pH/ORP sensors and reference half cells Installation
3.4 Scope of delivery
The delivery comprises:
• Sensor in the version ordered
• Operating Instructions
• Safety instructions for the hazardous area (for sensors with Ex approval)
3.5 Certificates and approvals
3.5.1 mark
The product meets the requirements of the harmonized European standards. As such, it
complies with the legal specifications of the EU directives. The manufacturer confirms
successful testing of the product by affixing to it the mark.
3.5.2 EAC
The product has been certified according to guidelines TP TC 004/2011 and TP TC 020/2011
which apply in the European Economic Area (EEA). The EAC conformity mark is affixed to the
product.
3.5.3 Marine approvals
A selection of the devices and sensors have type approval for marine applications, issued by
the following classification societies: ABS (American Bureau of Shipping), BV (Bureau
Veritas), DNV-GL (Det Norske Veritas-Germanischer Lloyd) and LR (Lloyd’s Register). Details
of the order codes of the approved devices and sensors, and the installation and ambient
conditions, are provided in the relevant certificates for marine applications on the product
page on the Internet.
4 Installation
4.1 Installation conditions
• 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).
4.1.1 Orientation
All sensors except CPS71(D)-*BU/TU**
• Do not install the sensors upside-down.
• The angle of inclination from the horizontal must be at least 15°.
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Installation pH/ORP sensors and reference half cells
15°
15°
A
B
360°
A0028039
1 Installation angle at least 15° from the horizontal
A Permitted orientation
B Incorrect orientation
Only CPS71(D)-*BU/TU**
1)
• The sensors are suitable for upside-down installation.
• Install the sensors at any angle.
2 Any installation angle
CAUTION
L
Glass sensor with pressurized reference
Possibility of sudden rupture and injury from glass splinters!
When handling these sensors, always wear protective goggles and appropriate protective
‣
gloves.
A0028040
1) Upside-down installation is also possible for ORP and reference half cells with a solid gel.
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pH/ORP sensors and reference half cells Installation
Installation instructions for CPS71(D)-*TP**
CAUTION
L
Glass sensor with pressurized reference
Possibility of sudden rupture and injury from glass splinters!
Always wear protective goggles when working with these sensors.
‣
Exercise particular care when removing the silicone seal from the reference junction. Here,
‣
a knife is used to activate the sensor for measuring operation.
For correct pH measurement:
Before commissioning the sensor, remove the silicone seal from the junction. Use the knife
‣
supplied for this purpose.
4.2 Post-installation check
Put the sensor into operation only if you can answer "yes" to the following questions:
• Are the sensor and cable undamaged?
• Is the orientation correct?
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Electrical connection pH/ORP sensors and reference half cells
YE
GN
BN
WH
GND
+
–
Com A
Com B
GY
BN
n.c.
BK
WH
GN
WH
YE
Temp.
Temp.
Temp.
GY
BK
Ref.
WH
pH/ORP
BN
PM
PM
5 Electrical connection
5.1 Connecting the sensor
Memosens sensors
A0028047
3 Measuring cable CYK10 or CYK20
Sensors with TOP68 plug-in head
A0028048
4 Measuring cable CPK9
Sensors with GSA plug-in head
5 Measuring cable CPK1
Please follow the connection instructions contained in the Operating Instructions for the
‣
transmitter.
10 Endress+Hauser
A0028051
pH/ORP sensors and reference half cells Commissioning
6 Commissioning
6.1 Calibration and measurement
The frequency with which a sensor calibration or sensor check is performed depends on the
operating conditions, e.g. contamination and chemical load.
New pH or ORP sensors with Memosens technology do not need to be calibrated.
Calibration is only required if very strict accuracy requirements must be met, or if the
sensor has been in storage for longer than 3 months.
• Two-point calibration is required for pH sensors. Use a high-quality buffer from
Endress+Hauser, e.g. CPY20, for this purpose.
• Single-point calibration is required for ORP sensors. Use a buffer solution with 220 mV or
468 mV from Endress+Hauser, e.g. CPY3, for this purpose.
Remove the protection cap for calibration and measurement.
‣
pH/ORP sensors which are stored dry must be immersed in medium for at least 24 hours
‣
before use. Otherwise severe value drifting can be expected.
If the protection cap is no longer used to store the sensor, store the sensor in a KCl solution
‣
(3 mol/l) or buffer solution.
The frequency at which a sensor calibration or sensor inspection is performed depends on
‣
the operating conditions (fouling, chemical load).
Analog pH or ORP sensors must be calibrated when they are connected for the first time.
‣
1. Immerse the sensor into a defined buffer solution (e.g. pH 7 or 220 mV).
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Commissioning pH/ORP sensors and reference half cells
In the case of a symmetrical connection (b), also immerse the potential matching line (PML)
into the solution. In the case of an asymmetrical connection, use a cable without a PML or cut
off the PML directly after the heat shrink tube.
Connection with a PML is not necessary for pH or ORP sensors with Memosens
technology (a).
2. Perform the calibration at the transmitter:
(a) In the case of pH sensors and manual temperature compensation, set the measurement
temperature.
(b) Enter the pH value , or the mV value, of the buffer solution.
(c) Start calibration.
(d) The value is accepted once it has stabilized.
3. Rinse the sensor with distilled water. Do not dry the sensor!
In the case of ORP sensors, this completes the calibration and the device is adjusted to
the sensor.
4. Immerse the pH sensor into the second buffer solution (e.g. pH 4).
5. Perform the calibration at the transmitter:
(a) Enter the pH value of the second buffer solution.
(b) Start the calibration.
(c) The value is accepted once it has stabilized.
The device calculates the zero point and slope and displays the values. Once the adjustment
values have been accepted, the device is adjusted to the new pH sensor.
6. Rinse the pH sensor with distilled water.
12 Endress+Hauser
pH/ORP sensors and reference half cells Maintenance
7 Maintenance
7.1 Maintenance tasks
7.1.1 Cleaning the sensor
WARNING
L
Mineral acids and hydrofluoric acid
Risk of serious or fatal injury from caustic burns!
Wear goggles to protect eyes.
‣
Wear protective gloves and appropriate protective clothing.
‣
Avoid all contact with the eyes, mouth and skin.
‣
If using hydrofluoric acid, use plastic vessels only.
‣
WARNING
L
Thiocarbamide
Harmful if swallowed! Limited evidence of carcinogenicity! Possible risk of harm to the unborn
child! Dangerous for the environment with long-term effects!
Wear protective goggles, protective gloves and appropriate protective clothing.
‣
Avoid all contact with the eyes, mouth and skin.
‣
Avoid discharge into the environment.
‣
Clean away fouling on the sensor as follows depending on the type of fouling:
1. Oily and greasy films:
Clean with fat solvent, e.g. alcohol, or hot water and agents containing surfactants
(alkaline) (e.g. dishwashing detergent).
2. Lime and metal hydroxide buildup and low solubility (lyophobic) organic buildup:
Dissolve buildup with diluted hydrochloric acid (3 %) and then rinse thoroughly with
plenty of clear water.
3. Sulfidic buildup (from flue gas desulfurization or wastewater treatment plants):
Use a mixture of hydrochloric acid (3 %) and thiocarbamide (commercially available)
and then rinse thoroughly with plenty of clear water.
4. Buildup containing proteins (e.g. food industry):
Use a mixture of hydrochloric acid (0.5 %) and pepsin (commercially available) and then
rinse thoroughly with plenty of clear water.
5. Readily soluble biological buildup:
Rinse with pressurized water.
After cleaning, rinse the sensor thoroughly with water and then recalibrate.
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Repair pH/ORP sensors and reference half cells
8 Repair
8.1 Return
The product must be returned if repairs or a factory calibration are required, or if the wrong
product was ordered or delivered. As an ISO-certified company and also due to legal
regulations, Endress+Hauser is obliged to follow certain procedures when handling any
returned products that have been in contact with medium.
To ensure the swift, safe and professional return of the device:
Refer to the website www.endress.com/support/return-material for information on the
‣
procedure and conditions for returning devices.
8.2 Disposal
The device contains electronic components. The product must be disposed of as electronic
waste.
Observe the local regulations.
‣
14 Endress+Hauser
*71478132*
71478132
www.addresses.endress.com
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