Endress+Hauser Ceramax CPS341D User manual

BA468C/07/EN/06.10
71116332
Operating Instructions
Ceramax CPS341D
Sensor with pH-sensitive enamel and
digital Memosens technology

Endress+Hauser
Ceramax CPS341D
Table of contents
1 Safety instructions . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . 5
1.4 Notes on safety conventions and icons . . . . 5
2 Identification . . . . . . . . . . . . . . 6
2.1 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Certificates and approvals . . . . . . . . . . . . . . 6
3 Installation . . . . . . . . . . . . . . . . 7
3.1 Overview of sensor . . . . . . . . . . . . . . . . . . 7
3.2 Installation conditions . . . . . . . . . . . . . . . . 8
3.3 Installing in the process . . . . . . . . . . . . . . 10
3.4 Installing the electrolyte vessel . . . . . . . . . 10
3.5 Mounting the optional electrolyte monitor 11
4 Wiring . . . . . . . . . . . . . . . . . . 12
4.1 Connecting the sensor . . . . . . . . . . . . . . . 12
4.2 Connecting the optional electrolyte monitor .
13
5 Commissioning. . . . . . . . . . . . 14
5.1 Disinfecting the electrolyte system . . . . . . 14
5.2 Regenerating the sensor . . . . . . . . . . . . . . 15
5.3 Filling the electrolyte vessel . . . . . . . . . . . 16
5.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . 18
6 Maintenance. . . . . . . . . . . . . . 19
6.1 Changing the electrolyte bottle . . . . . . . . . 19
6.2 Cleaning the sensor . . . . . . . . . . . . . . . . . 20
7 Accessories. . . . . . . . . . . . . . . 23
7.1 CPS341Z . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . 23
7.3 Buffer solutions . . . . . . . . . . . . . . . . . . . . 24
7.4 Measuring cable . . . . . . . . . . . . . . . . . . . . 24
8 Troubleshooting . . . . . . . . . . . 25
8.1 Troubleshooting instructions . . . . . . . . . . 25
8.2 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . 25
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9 Technical data . . . . . . . . . . . . . 26
9.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.2 Environment . . . . . . . . . . . . . . . . . . . . . . 26
9.3 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.4 Mechanical construction . . . . . . . . . . . . . . 27
Index. . . . . . . . . . . . . . . . . . . . 28

Safety instructions Ceramax CPS341D
4Endress+Hauser
1 Safety instructions
1.1 Designated use
The pH sensor is designed for the continuous measurement of the pH value in liquids.
Recommended applications include:
• Food production, including thick, high-viscosity media
• Beverage production and filling
• Quality control
• Pharmaceutical industry:
– Water treatment
– Active ingredient production
– Active ingredient preparation
– Fermentation
– Biotechnology
Any use other than that described here compromises the safety of persons and the entire
measuring system and is, therefore, not permitted.
The manufacturer is not liable for damage resulting from improper or non-designated use.
1.2 Installation, commissioning and operation
Please note the following items:
• Installation, commissioning, operation and maintenance of the measuring system must only
be carried out by trained technical personnel.
Trained personnel must be authorized for the specified activities by the system operator.
• Electrical connection must only be carried out by a certified electrician.
• Technical personnel must have read and understood these Operating Instructions and must
adhere to them.
• Before commissioning the entire measuring point, check all the connections. Ensure that
electrical cables and hose connections are not damaged.
• Do not operate damaged products and secure them against unintentional commissioning.
Mark the damaged product as being defective.
• Measuring point faults may only be rectified by authorized and specially trained personnel.
• If faults can not be rectified, the products must be taken out of service and secured against
unintentional commissioning.
• Repairs not described in these Operating Instructions may only be carried out at the
manufacturer’s or by the service organization.

Ceramax CPS341D Safety instructions
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1.3 Operational safety
The sensor 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.
Relevant regulations and European standards have been observed.
As the user, you are responsible for complying with the following safety conditions:
• Installation instructions
• Local standards and regulations
1.4 Notes on safety conventions and icons
The structure, signal words and safety colors of the signs comply with the specifications of
ANSI Z535.6 ("Product safety information in product manuals, instructions and other collateral
materials").
Safety message structure Meaning
DANGER
!
Cause (/consequences)
Consequences if safety
message is not heeded
►Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the situation will result in a fatal or serious
injury.
WARNING
!
Cause (/consequences)
Consequences if safety
message is not heeded
►Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the situation can result in a fatal or serious
injury.
CAUTION
!
Cause (/consequences)
Consequences if safety
message is not heeded
►Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or medium
injury.
NOTICE
Cause/situation
Consequences if safety
message is not heeded
►Action/note
This symbol alerts you to situations that can result in damage
to property and equipment.

Identification Ceramax CPS341D
6Endress+Hauser
2 Identification
2.1 Nameplate
The nameplate can be found on the sensor.
The following information is provided on the nameplate:
• Order code
• Extended order code
• Serial number
• Protection class
• Ambient/process conditions
Compare the data on the nameplate with your order.
To find out what sensor version you have, enter the order code indicated on the nameplate
in the search screen at the following address: www.products.endress.com/order-ident
2.2 Certificates and approvals
Declaration of Conformity
The product meets the requirements of the harmonized European standards.
As such, it complies with the legal specifications of the EC directives.
The manufacturer confirms successful testing of the product by affixing to it the 4mark.

Ceramax CPS341D Installation
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3 Installation
3.1 Overview of sensor
The CPS341D can be divided into the following parts:
• pH-sensitive part
• Reference system
• Process connection
pH-sensitive part Reference system Process connection
• Glass-lined steel tube (3)
• Yellow pH-sensitive enamel with
metal reference lead (5)
•Diaphragm(4)
• Memosens plug-in head (1)
• Electrolyte vessel (8)
• Electrolyte bottle with septum (9)
• Supply of electrolyte with hose and
plug-in couplings (2 and 11)
• Reference electrode (in sensor head,
not visible from the outside)
Depends on version
•M20
• Pg 13.5
•3/4"
•1"
•NozzleDN25
•NozzleDN30
•VariventDN50/40
• Sanitary fitting DN50
• Sanitary fitting DN25
•Tri-ClampDN50
a0014135
Fig. 1:
1 Memosens plug-in head
2 Supply of electrolyte
3 Glass-lined steel tube
4Diaphragm
5 pH-sensitive enamel
(yellow)
6 Process connection
7Vent
a0014136
Fig. 2:
8 Electrolyte vessel
9 Electrolyte bottle
10 Compressed air connection
11 Electrolyte hose
12 Electrolyte supply coupling
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3
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Installation Ceramax CPS341D
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3.2 Installation conditions
3.2.1 Orientation
The CPS341D can be installed in any position.
a0013862
Fig. 3: Installation angle
0 ... 360°

Ceramax CPS341D Installation
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3.2.2 Dimensions
a0013874
Fig. 4: Dimensions

Installation Ceramax CPS341D
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3.3 Installing in the process
NOTICE
Built-in parts can damage the sensor enamel
►When installing in tanks and pipes, keep a sufficient distance from built-in parts and the wall.
Screw the sensor directly into an existing process connection.
3.4 Installing the electrolyte vessel
a0014069
Fig. 5: Electrolyte vessel
1
2
3
4
5
Clamp
Electrolyte bottle
Mounting plate
Ground terminal
G1/4 compressed air connection
6
7
8
9
Self-sealing connector with electrolyte hose
Self-sealing coupling
Cannula
Septum

Ceramax CPS341D Installation
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NOTICE
Minimum internal pressure in electrolyte system
If the internal pressure is too low, there is the danger of the process medium entering the sensor
through the diaphragm and contaminating the electrolyte.
►Set the compressed air supply in such a way that the pressure in the electrolyte vessel is
always at least 0.5 bar (7 psi) above the process pressure.
1. Mount the electrolyte vessel vertically on a wall.
Maximum distance from sensor: 5m (16 ft) (length of the connecting hose).
2. If necessary, shorten the connecting hose supplied to the desired length.
3. Connect the hose end with the self-sealing coupling to the connector of the sensor KCl
coupling.
4. Connect the hose end with the self-sealing connector to the coupling of the electrolyte
vessel (item 7).
5. Connect the compressed air supply to the G1/4 gland (item 5) via the onsite
pressure-reducing valve.
6. Set the internal pressure in the electrolyte vessel in such a way that the pressure is at least
0.5 bar above the process pressure but does not exceed the permitted sensor process
pressure of 6 bar (90 psi).
A higher difference in pressure is possible but increases the rate of electrolyte consumption.
3.5 Mounting the optional electrolyte monitor
a0014091
Fig. 6: Electrolyte monitor
1. Unscrew the cover of the electrolyte monitor (bubble
sensor).
2. Fit the bubble sensor at the outlet of the electrolyte vessel
(2) onto the hose (3).
3. Screw the cover back on.
4. Connect the plug of the connecting cable CPS341Z-D3 to
the M12 connection (1).
Always order the connecting cable with the bubble sensor
as the sensor cannot work without the cable.
For information on how to connect the external supply
voltage,
--> see the "Wiring" section
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Wiring Ceramax CPS341D
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4 Wiring
4.1 Connecting the sensor
The sensor is electrically connected to the transmitter via the special measuring cable CYK10.
NOTICE
Zero point shift
If the sensor is immersed in medium and the transmitter is disconnected from the power supply,
polarization can cause an irreversible zero point shift. In such instances, the device must be
recalibrated.
►Do not disconnect the transmitter from the power supply while the sensor is immersed in
the medium.
►When performing maintenance work or similar with the sensor connected, remove the
sensor from the medium and dry it before disconnecting the transmitter from the power
supply.
►In general, avoid any kind of conductive connection between the reference and the
pH-sensitive enamel when the unit is switched off.
►If you have taken the sensor out of the medium, it is essential you use the KCl protection
cap specially designed for CPS341D to protect the diaphragm.
a0003350
Fig. 7: Special measuring cable CYK10

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4.2 Connecting the optional electrolyte monitor
1. Connect the connecting cable to an onsite power supply provided by the customer
(see examples).
2. Connect the M12 plug to the M12 connection of the bubble sensor (if not already
performed during installation).
Light emitting diodes in the cable connector indicate the status in the electrolyte supply
system:
Green = supply voltage on
Green + yellow = air bubble in the hose (electrolyte vessel empty)
a0014094
Fig. 8: Connecting to the customer power supply with a
relay
a0014095
Fig. 9: Connecting to the customer power supply with a
PLC

Commissioning Ceramax CPS341D
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5Commissioning
Prior to initial commissioning, make sure that:
• The sensor has been installed correctly
• The electrical connection is correct
Several steps are involved in the process of commissioning the sensor:
1. Disinfecting the electrolyte system (optional, for sterile applications)
2. Regenerating the sensor
3. Filling the electrolyte vessel
4. Calibrating/adjusting the sensor
5.1 Disinfecting the electrolyte system
For sterile applications, you can disinfect the entire electrolyte system with 70% ethanol prior
to commissioning (ethanol is not included in the scope of supply).
The sensor parts in contact with the medium must be sterilized by appropriate means (SIP).
1.Insert the ethanol bottle
a. Release the clamp (1) on the mounted electrolyte vessel and remove the upper part (2).
b. Fill an empty septum bottle (see "Accessories") with 70% ethanol.
c. Place the bottle into the bottom part of the electrolyte vessel with the septum in a
central position and pointing downwards. This causes the cannula of the electrolyte
vessel to pierce the septum.
d. Fit the upper part and seal the device tightly with the clamp.
e. If you have not already done so, connect the electrolyte vessel and the sensor via the
electrolyte hose that can be plugged in at both ends.
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2. Disinfect the electrolyte system
a. Apply at least 3 bar (45 psi) pressure to the electrolyte vessel.
b. Open the vent screw on the sensor (5) (one revolution) until approx. 50 to 100 ml of
ethanol flows out of the vent opening (4).
c. Allow the ethanol to take effect for 2 to 5 minutes.
3. Remove the ethanol bottle
a. Switch off the compressed air and release the pressure on the electrolyte vessel (release
the thread adapter nut on the plastic insert (Fig. under 1., item 3) by 2-3 revolutions).
b. Once the vessel is unpressurized tighten the thread adapter nut immediately.
c. Release the clamp on the electrolyte vessel and remove the upper part.
d. Remove the ethanol bottle.
4. Fill the sensor with electrolyte (--> following section) directly after disinfecting the unit.
5.2 Regenerating the sensor
Slightly larger measured errors can occur during commissioning when using new sensors and
sensors that have been dry for extended periods. Regeneration eliminates these measured errors.
During the regeneration process, the necessary gel layer is formed on the surface of the
pH-sensitive enamel.
If the sensor is cleaned and sterilized in the tank or pipe before commissioning, additional
regeneration is not required.
The sensor is regenerated with the sensor installed and connected. The transmitter must be
switched on.
There are three possible ways to regenerate the sensor:
1. Wet the sensor for 12-24 hours.
2. Immerse the sensor in hot water (temperature of 70 to 100 °C (160 to 210 °F)) for
approximately 30 minutes.
3. Treat the sensor with water vapor for 10 to 15 minutes.
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Commissioning Ceramax CPS341D
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5.3 Filling the electrolyte vessel
The electrolyte must be free from bubbles. This is the only way to ensure the correct electrical
connection between the reference electrode and the diaphragm.
The electrolyte is 3M KCl (pH 4) with an added inhibitor (1 ml/l colloidal silicic acid)
which prevents the formation of bacteria.
1. Insert the electrolyte bottle (see "Accessories")
a. Release the clamp (1) on the electrolyte vessel and remove the upper part (2).
b. Remove the read seal cap on the bottle of electrolyte.
c. Place the bottle into the bottom part of the electrolyte vessel with the septum in a
central position and pointing downwards. This causes the cannula of the electrolyte
vessel to pierce the septum.
d. Fit the upper part and seal the device tightly with the clamp.
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Ceramax CPS341D Commissioning
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2. Fill the electrolyte system
a. Apply at least 3 bar (45 psi) pressure to the electrolyte vessel.
b. If you have not already done so:
– Connect the electrolyte vessel and the sensor via the electrolyte hose that can be
plugged in at both ends.
– Connect the sensor to the transmitter and switch on the transmitter.
c. Open the vent screw on the sensor (5) (one revolution) until bubble-free electrolyte
exits the vent opening (4).
If you disinfected the electrolyte system beforehand, allow at least 50-100 ml of
electrolyte to escape.
d. Close the vent screw and clean the sensor around the vent opening with water.
e. Establish the process pressure in the electrolyte vessel.
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Commissioning Ceramax CPS341D
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5.4 Calibration
5.4.1 Need for calibration
The calibration data are stored in the Memosens head at the factory and are transferred to the
transmitter.
The sensor is ready to measure immediately.
It is recommended to verify the calibration data and recalibrate if necessary if the device has not
been in operation for an extended period.
Perform the calibration as specified in the Operating Instructions of the transmitter.
5.4.2 Types of calibration
The following types of calibration are possible:
• Two-point calibration
– With calibration buffers
– Entry of data for the slope, zero point and temperature
• Single-point calibration
– Entry of an offset or a reference value
– Sample calibration with laboratory comparative value
• Temperature adjustment by entering a reference value

Ceramax CPS341D Maintenance
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6Maintenance
6.1 Changing the electrolyte bottle
You should change the bottle before it is completely empty. In this way, you can ensure
that the electrolyte system is always full.
If you are using the optional electrolyte monitor, a message is activated when the first air
bubble is detected at the outlet of the vessel. Then replace the bottle of electrolyte within
the next 10 hours.
NOTICE
Process pressure and process temperature
Medium penetrating the system can contaminate the sensor reference system
►Only replace the bottle of electrolyte when no process pressure is applied and at
temperatures below 80 °C (176 °F).
►If this is not possible, you must replace the bottle very quickly.
1. Disconnect the electrolyte hose from the outlet of the electrolyte vessel by pressing the
unlocking unit on the coupling (4) and removing the hose with the connector.
The pressure is maintained briefly in the hose and sensor.
2. Switch off the compressed air and release the pressure on the electrolyte vessel (release the
thread adapter nut on the plastic insert (item 3) by 2-3 revolutions).
3. Insert the electrolyte bottle
a. Release the clamp (1) on the electrolyte vessel and remove the upper part (2).
b. Place the bottle of electrolyte into the bottom part of the electrolyte vessel with the
septum in a central position and pointing downwards. This causes the cannula of the
electrolyte vessel to pierce the septum.
c. Fit the upper part and seal the device tightly with the clamp.
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Maintenance Ceramax CPS341D
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4. Reinsert the (self-sealing) connector of the electrolyte hose into the coupling on the
electrolyte vessel.
5. Fill the electrolyte system
a. Apply at least 3 bar (45 psi) pressure to the electrolyte vessel.
b. Open the vent screw on the sensor (5) (one revolution) until bubble-free electrolyte
exits the vent opening (4).
c. Close the vent screw and clean the sensor around the vent opening with water.
d. Establish the process pressure in the electrolyte vessel.
6.2 Cleaning the sensor
6.2.1 Cleaning agent
Suitable cleaning agents
• Water or solvents
• Non-scratch stainless steel cleaner
• Diluted hydrochloric acid (5 to 20%)
NOTICE
Fluorinated acids and abrasive cleaners
Fluorinated acids (e.g. hydrofluoric acid) and abrasive substances corrode the enamel.
►Never use fluorinated acids to clean the sensor.
►Do not use metal or abrasive cleaning agents.
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