Endress+Hauser Cleanfit P CPA472 User manual

BA223C/07/en/07.03
51502647
Operating Instructions
Cleanfit P CPA472
Retractable Process Assembly

Endress+Hauser

Cleanfit P CPA472
Endress+Hauser 3
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Notes on safety icons and symbols . . . . . . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . 6
2.1 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Product structure . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Installation . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Incoming acceptance, transport, storage . . . . . . . . . . 8
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . 11
3.4 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 17
4 Operation . . . . . . . . . . . . . . . . . . . . . . 18
4.1 First commissioning . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Manual operation . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4 Pneumatic operation . . . . . . . . . . . . . . . . . . . . . . . 19
5 Maintenance. . . . . . . . . . . . . . . . . . . . 20
5.1 Cleaning the assembly . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Cleaning the sensor . . . . . . . . . . . . . . . . . . . . . . . . 20
5.3 Cleaning agents . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4 Notes on calibration . . . . . . . . . . . . . . . . . . . . . . . 21
6 Accessories. . . . . . . . . . . . . . . . . . . . . 22
6.1 Installation accessories . . . . . . . . . . . . . . . . . . . . . . 22
6.2 Limit position switches . . . . . . . . . . . . . . . . . . . . . 23
6.3 Pneumatic throttle . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.5 Calibration solutions . . . . . . . . . . . . . . . . . . . . . . . 24
6.6 Measuring cables . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.7 Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.8 Measuring, cleaning and calibration systems . . . . . 24
7 Trouble-shooting . . . . . . . . . . . . . . . . 25
7.1 Replacing damaged parts . . . . . . . . . . . . . . . . . . . . 25
7.2 Replacing seals . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.3 Spare part kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.5 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8 Technical data . . . . . . . . . . . . . . . . . . . 31
8.1 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.3 Mechanical construction . . . . . . . . . . . . . . . . . . . . 32
Index . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Safety instructions Cleanfit P CPA472
4Endress+Hauser
1 Safety instructions
1.1 Designated use
The manually or pneumatically operated retractable assembly Cleanfit P CPA472 is designed for
installing pH/redox sensors in tanks and pipes.
Its mechanical design permits its use in pressurized systems (see "Technical data").
Any other use than the one described here compromises the safety of persons and the entire
measuring system and is, therefore, not permitted.
The manufacturer is not liable for damage caused by 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.
The technical 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 for
correctness. 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 organisation.
1.3 Operational safety
The assembly has been designed and tested according to the state of the art and left the factory in
perfect functioning order.
Relevant regulations and European standards have been met.
As the user, you are responsible for complying with the following safety conditions:
• Installation instructions
• Local prevailing standards and regulations.
1.4 Return
If the assembly has to be repaired, please return it cleaned to the sales center responsible.
Please use the original packaging, if possible.
Please enclose the completed "Declaration of contamination" (copy the second last page of these
Operating Instructions) with the packaging and the transportation documents.
No repair without completed "Declaration of contamination"!

Cleanfit P CPA472 Safety instructions
Endress+Hauser 5
1.5 Notes on safety icons and symbols
#Warning!
This symbol alerts you to hazards. They can cause serious damage to the instrument or to persons
if ignored.
"Caution!
This symbol alerts you to possible faults which could arise from incorrect operation. They could
cause damage to the instrument if ignored.
!Note!
This symbol indicates important items of information.

Identification Cleanfit P CPA472
6Endress+Hauser
2 Identification
2.1 Nameplate
You can identify the assembly version by the order code on the nameplate. Please compare this code
with your order.
You can find possible assembly versions and the resulting order codes in the product structure.
2.2 Scope of delivery
The scope of delivery comprises:
• Cleanfit assembly (ordered version)
• Operating Instructions (English).
If you have any questions, please contact your supplier or your sales center responsible.
a0006680
Fig. 1: Example of a nameplate
CLEANFIT P CPA472
spec.:
pressure: PN=6 bar (20°C) T=80°C
order code: CPA472-B1A1C2A4
serial no.: 2 12318 09C14

Cleanfit P CPA472 Identification
Endress+Hauser 7
2.3 Product structure
Drive type and limit contact switches
A Manual (cannot be converted to pneumatic)
B Pneumatic without limit contact switches (suitable for retrofitting)
C Pneumatic with 2 pneumatic limit contact switches
D Pneumatic with 2 electric limit contact switches (max. 90 °C / 194 °F)
E Pneumatic with 2 electric Ex limit contact switches (max. 90 °C / 194 °F)
Assembly version
1 Standard version
Electrode holder
A For gel electrodes / ISFET sensors with Pg 13.5
B For liquid KCl electrodes / ISFET sensors with Pg 13.5 hose connection head
Immersion depth
1 Short version: up to 101 mm (depending on process connection)
(possible electrode lengths: A = 120 mm, B = 225 mm)
2 Long version: up to 208 mm (depending on process connection)
(possible electrode length: A = 225 mm)
9 Special version acc. to customer
Assembly material (in contact with medium)
A In contact with medium: PP
B In contact with medium: PEEK
C In contact with medium: PVDF
Seal material (in contact with medium)
2FPM(Viton
®, preferred for process application)
3KALREZ
®
Process connection
A G 1¼ external thread
B NPT 1" external thread
C Dairy fitting DN 50 (acc to. DIN 11 851)
D DN 50 flange, PP (acc. to EN 1092)
E 2" ANSI flange, PP
Optional equipment
1 Without rinse connection (retrofitting not possible)
3 With rinse fitting 2 x G ¼ internal thread
4 With rinse fitting 2 x NPT ¼" internal thread
CPA472- complete order code

Installation Cleanfit P CPA472
8Endress+Hauser
3 Installation
3.1 Incoming acceptance, transport, storage
• Make sure the packaging is undamaged!
Inform the supplier about damage to the packaging. Keep the damaged packaging until the matter
has been settled.
• Make sure the contents are undamaged!
Inform the supplier about damage to the delivery contents. Keep the damaged products until the
matter has been settled.
• Check that the scope of delivery is complete and agrees with your order and the shipping
documents.
• The packaging material used to store or to transport the product must provide shock protection
and humidity protection. The original packaging offers the best protection. Also, keep to the
approved ambient conditions (see "Technical data").
• If you have any questions, please contact your supplier or your sales center responsible.
3.2 Installation conditions
3.2.1 Notes on installation
The assembly is designed for installation on tanks and pipes. Suitable nozzles must be available for
this.
!Note!
• When using standard glass electrodes, only installation positions are permitted in which the
middle axis of the assembly lies at least at an angle of 15° from the horizontal (see diagram).
Otherwise, there will not be a reliable contact between the inner side of the pH membrane and
the inner terminal leads via the electrolytes.
• When using an ISFET Tophit sensor, there are, in principle, no restrictions for the installation
position. An installation angle of 0 to 180° is, however, recommended.
C07-CPA472xx-17-07-00-xx-002.eps
Fig. 2: Installation angle
A Glass electrodes: minimum 15 ° to the horizontal
B ISFET sensors: recommended 0 ... 180 °, overhead possible (depending on sensor type)
15° 15°
AB

Cleanfit P CPA472 Installation
Endress+Hauser 9
C07-CPA471xx-17-07-00-xx-002.eps
Fig. 3: Installation examples with recommended installation angle (glass electrodes)
ATank
BPipebend
C Horizontal pipe
D Ascending pipe
"Caution!
• Avoid a siphon effect1) at the rinse chamber outlet when installing with inclined orientation. The
inlet to the rinse chamber must be from below.
!Note!
• The minimum diameter for direct installation in pipework is DN 80. This diameter is required so
that the assembly has sufficient distance from the pipe wall when brought into the "Measuring"
position.
• Use a flow assembly to install the assembly in smaller pipe diameters (see Accessories).
• When designing the installation nozzle, please observe the total immersion depth in operation
(sensor holder not inserted). Ensure that the sensor is always immersed in the medium during
operation (see "Dimensions").
> 15 °
> 15 °
> 15 °
> 15 °
AB
CD
1) Siphon effect: line emptied by vacuum

Installation Cleanfit P CPA472
10 Endress+Hauser
3.2.2 Dimensions
C07-CPA472xx-06-07-00-en-003.eps
Fig. 4: Short version
C07-CPA472xx-06-07-00-en-002.eps
Fig. 5: Long version
C07-CPA472xx-06-07-00-en-001.eps
Fig. 6: Short version for
liquid KCl sensors
Stroke 65 / 2.56
Ø 80 / 3.35
Ø 30 / 1.18
Ø 58 / 2.28
186 / 7.32
110 / 4.33
G 1¼
Ø 38 / 1.50
Ø 20 / 0.79
43 / 1.69 125 / 4.92
40 / 1.57
mm / inch
Stroke 170 / 6.69
291 / 11.46
215 / 8.46
43 / 1.69
G 1¼
Ø 38 / 1.50
Ø 20 / 0.79
Ø 58 / 2.28
125 / 4.92
Ø 80 / 3.35
Ø 30 / 1.18
40 / 1.57
mm / inch
Stroke 67 / 2.64
Ø 20 / 0.79
110 / 4.33
35 / 1.38
541 / 21.30
Ø 38 / 1.50
G 1¼
Ø 30/
1.18 Ø 80 / 3.35
40 / 1.57
160 / 6.30
mm / inch

Cleanfit P CPA472 Installation
Endress+Hauser 11
3.2.3 Process connections
C07-CPA472xx-04-07-07-en-001.eps
Fig. 7: Process connections (short version, long version dimensions in brackets)
A G1 ¼ external thread
B NPT 1" external thread
C DN 50 dairy fitting
D/E DN 50 flange (DIN 1092-1) resp. ANSI 2" flange
3.3 Installation instructions
3.3.1 Measuring system
AB
C
D / E
108 / 4.25
(215 / 8.46)
94 / 3.70
(201 / 7.91)
42/1.65
66 / 2.60
(173/6.81)
mm / inch
108 / 4.25
(215 / 8.46)
42/1.65
C07-CPA472xx-04-07-03-xx-001
Fig. 8: Fully automatic measuring system (example)
A, B For information on function and connection of the pneumatic resp. electric limit position switches to the assembly,
please refer to the related chapters.
1
4
9
Assembly
Special measuring cable, e.g. CPK9, CPK12
Rinse block CPR40 (optionally)
a
b
c
Electric line
Compressed air line
Water / cleaning agent / buffer
Topcal S CPC300:1)
1) Fully automatic calibration and cleaning system
Supply lines:
2
3
5
6
7
8
Transmitter Mycom S CPM 153
Control unit CPG300
Supply / control cable
Multi hose
Vessels for cleaning agents + buffer solutions
Hoses of cleaning agents and buffers
10
11
12
13
14
Power supply for Mycom S CPM153
Power supply for CPG300
Compressed air
Water supply
Steam / water / cleaning agent (optionally)
A
B
MYCOMS CPM 153
MYCOMS CPM 153
ENDRESS+HAUSER
ENDRESS+HAUSER
MEAS CAL
DIAG PARAM
PARAM
?
Messen Hold
Aus
Wahl
pH 7.00
ATC
Temperatur25.0°C
Endress+Hauser
CPG 300
12
3
8
10
11
12
13
5
14
6
7
9
a
b
c
4

Installation Cleanfit P CPA472
12 Endress+Hauser
3.3.2 Installing the assembly into the process
!Note!
Depending on the process connection, please observe the following:
• Check the flange seal between the flanges before installing the assembly.
• The thread adapter nut of thread G 1¼ does not function as a seal. Therefore, simply tighten the
thread adapter nut by hand.
1. Move the assembly into the "Service" position (electrode holder inserted in the assembly).
2. Secure the assembly to the tank or the piping using your selected process connection.
3. Follow the instructions for compressed air and rinse water connection (if used) given in the
following chapters.
3.3.3 Compressed air connection1)
Requirements:
• air pressure of 4 to 8 bar (58 to 116 psi)
• air must be filtered (40 µm) and be free of water and oil
• no continuous air consumption
• minimum nominal diameter of the air lines: 4 mm (0.16 inches).
"Caution!
There must be a pressure-reducing valve upstream if the air pressure can increase to above 8 bar
(116 psi) (including any short pressure surges).
We recommend you also use a pneumatic throttle for lower pressures. This results in a smoother
assembly operation. Endress+Hauser offers such a throttle as an accessory (see chapter
"Accessories").
C07-CPA471xx-15-07-06-xx-001.eps
Fig. 9: Pneumatics and limit position switches
M =
S =
M1
M2
S1
S2
1
2
3
4
5
6
7
8
Measuring
Service
Pneumatics "Assembly measuring"
Limit position switch "Assembly measuring" 1)
Pneumatics "Assembly Service"
Limit position switch "Assembly Service" 1
(see chapter "Pneumatic operation")
Splash protection cap
Assembly housing (cylinder)
Seals in contact with medium
Retractable pipe
Potential matching
Stop bolt
Rinse fitting (optional)
Sensor holder (= sensor guide)
1) pneumatic or electric limit position switch depending on assembly version (see product structure)
1) pneumatically operated assembly only
1
M1
2
S1
3
4
5
S2
6
M2
7
8

Cleanfit P CPA472 Installation
Endress+Hauser 13
Limit position switches
!Note!
The position of the input resp. the output may be different from the figure. Please, refer to the marks
at the limit position switch: "1" is the input (in), "2" is the output (out).
Pneumatics and limit position switch connection
!Note!
Following, you find the connection of the compressed air lines to the assembly. The compressed air
supply and the tapping of the position feedback signals are described for Topcal S CPC300 resp.
Topclean S CPC30 as an example.
C07-CPA471xx-04-07-00-xx-001.eps
Fig. 11: Pneumatic connections and pneumatic limit position switches (1=inlet, 2=outlet)
M1 Pneumatics "Assembly measuring"
M2 Position feedback signal "Assembly measuring"
S1 Pneumatics "Assembly service"
S2 Position feedback signal "Assembly service"
nTopcal/Topclean: hose no. 2
oTopcal/Topclean: hose no. 3
qTopcal/Topclean: hose no. 5
rTopcal/Topclean: hose no. 6
The pneumatic limit position switches serve as control elements and determine the sequence of the
individual steps.
1. Connect the compressed air supply line for "Assembly measuring" (Topcal/Topclean: hose
no. n) to the upper G¼ pneumatics connection (Fig. 11).
2. Also, connect the compressed air supply line no. nto the inlet (1) of the lower limit position
switch (M2, via T-piece). This limit position switch supplies the position feedback signal
"Assembly measuring".
3. When the "Measuring" position is reached, the air applied to the inlet (1) is switched through
and can be tapped at the outlet (2) (Topcal/ Topclean: connect hose qto the limit position
switch outlet).
Pneumatic: 3/2 way valve
Electric: inductive (NAMUR type)
a0002727
Fig. 10: Limit position switches, left: pneumatic (1 = compressed air inlet, 2 = compressed air outlet)
right: electric (NAMUR)
out (2)
out (2)
in (1)
in (1)
1/BN L+Õ
2/BU L–Õ
1
2
1
2
M1
S1
S2
M2
2
3
Topcal /
Topclean
Topcal /
Topclean
6
5

Installation Cleanfit P CPA472
14 Endress+Hauser
4. Connect the compressed air supply line for "Assembly service" (Topcal/Topclean: hose no. o)
to the lower G¼ pneumatics connection.
5. Also, connect the compressed air supply line no. oto the inlet (1) of the upper limit position
switch (S2, via T-piece). This limit position switch supplies the position feedback signal
"Assembly service".
6. When the position "Service" is reached, the air applied to the inlet (1) is switched through and
can be tapped at the outlet (2) (Topcal/ Topclean: hose no. r).
Electric limit position switch connection
Like the pneumatic limit position switches, the electric limit position switches also serve as control
elements and determine the sequence of the individual steps.
Connect the NAMUR limit position switches to the corresponding terminals at the transmitter.
Please, refer to the Operating Instructions of the transmitter for the terminal numbers. The following
figure shows the electric limit position switch connection to the terminals 11 to 14 of the Topcal S
control unit, as an example.
3.3.4 Rinse water connection
1. Connect the rinse water pipe to the designated rinse nozzle. Both rinse nozzles on the
assembly are identical. Use one as an inlet and the other as an outlet.
2. Operate the rinse water connection of the assembly with a water pressure of 2 to max. 6 bar
(29 to 87 psi).
3. In addition, install a non-return valve and a dirt trap (100 µm) in the water supply line (at the
inlet to the assembly).
Besides water, other or additional cleaning solutions may be used in the rinse chamber. Pay
attention to the material resistance of the assembly and comply with the maximum permitted
temperatures and pressures.
"Caution!
If it is possible for the water pressure to rise above 6 bar (87 psi, including any transient pressure
surges), install a pressure reducing valve upstream. Otherwise the assembly may be damaged.
a0004334
Fig. 12: Electric limit position switches to Topcal
A
B
Limit position switch "Assembly service"
Limit position switch "Assembly measuring"
+
+
11 12 13 14 A
B
–
–

Cleanfit P CPA472 Installation
Endress+Hauser 15
3.3.5 Sensor installation
Gel sensors
"Caution!
If turned in the opposite direction, the stop lock bolt does not engage. This could, however, loosen
the sensor holder. The reason for this is adhesions on the lower part of the sensor holder. These can
cause the sensor holder to get stuck, producing a counterforce when unscrewing the sensor holder.
1. Remove the protection cap from the sensor.
Make sure the sensor shaft is fitted with the
O-ring (Fig. 13 pos. 1) and the thrust collar
(Fig. 13).
2. Moisten the sensor shaft before installing the
sensor.
3. Depending on the assembly version:
a. Manually driven assembly:
Pull the retractable pipe as far as possible
out of the assembly.
b. Pneumatically driven assembly:
Move the assembly into the "Service"
position.
4. Turn the stop lock bolt through 90° so that
the plastic grooves are located above the
recesses (Fig. 14, A).
5. Turn the retractable pipe clockwise until
the stop lock bolt engages (B).
C07-CPSxxxxx-11-05-00-xx-001.eps
Fig. 13: Sensor installation
1O-ring
2 Thrust collar
C07-CPA47xxx-19-07-00-xx-001.eps
Fig. 14: Stop bolt
1. Pull the retractable pipe as far as possible out
of the assembly ("Service" position).
2. Turn the stop lock bolt through 90° so that
the plastic grooves are located above the
recesses (Fig. 15, A).
3. Turn the retractable pipe clockwise until
the stop lock bolt engages (B).
C07-CPA47xxx-19-07-00-xx-001.eps
Fig. 15: Stop bolt
AStep2,seeleft
BStep3
2
1
AB
AB

Installation Cleanfit P CPA472
16 Endress+Hauser
Remove the sensor in the reverse sequence of operations.
!Note!
In case of symmetrical pH measurement, you must push the PML connector onto the PML
connection (PML = potential matching line, position 1). Please, read the Operating Instructions of
the transmitter.
Sensor with liquid KCl electrolyte
1. Pull the retractable pipe as far as possible out of the assembly ("Service" position).
2. Turn the stop lock bolt through 90°, so that the plastic grooves are located above the recesses.
3. Turn the retractable pipe clockwise until the stop lock bolt engages.
"Caution!
If turned in the opposite direction, the stop lock bolt does not engage. This could, however, loosen
the sensor holder. The reason for this is adhesions on the lower part of the sensor holder. These can
cause the sensor holder to get stuck, producing a counterforce when unscrewing the sensor holder.
1. Remove the splash protection cap (Fig. 16,
pos. 5) from the assembly.
2. Then loosen the retractable pipe (pos. 2) by
turning it anticlockwise.
3. Install the sensor (pos. 7) instead of the
dummy plug (pos. 3):
– first screw by hand
– then tighten the sensor by approx. ¼ turn
using an open end wrench (AF 17).
4. Insert the measuring cable through the
retractable pipe (pos. 2):
– Fixed cable:
from the bottom through the retractable
pipe, from the sensor to the transmitter
– Plug-in head sensor:
from the top to the sensor head
5. Plug-in head sensor only:
Connect sensor and cable.
6. Screw the retractable pipe back onto the
pressure cylinder (clockwise, by hand).
7. Place the measuring cable in the splash
protection cap and place the cap on the
retractable pipe.
a0002740
Fig. 16: Sensor installation
1 PML connection
2 Retractable pipe
3 Dummy plug (a=inserted and b=not inserted)
4 Stop lock bolt
5 Splash protection cap
6 Measuring cable with cable plug
7 Sensor or electrode
1
2
3
4
6
5
7

Cleanfit P CPA472 Installation
Endress+Hauser 17
!Note!
In case of symmetrical pH measurement, you must push the PML connector onto the PML
connection (PML = potential matching line, pos. 2). Please, read the Operating Instructions of the
transmitter.
3.4 Post-installation check
• After installation, check that all connections are firmly in position and leak-tight.
• Ensure that the hoses cannot be removed without force.
• Check all hoses for damage.
1. Remove the splash protection cap (Fig. 17,
pos. 6) and the KCl hood (pos. 7) incl. the
protective tube from the assembly.
2. Then slacken the retractable pipe (pos. 3) by
turning it counterclockwise.
3. Screw in the sensor:
a. Unscrew the tension sleeve (pos. 12)
from the inner pipe (pos. 11) and pull the
inner pipe out of the retractable pipe.
b. Install the sensor (pos. 10) into the inner
pipe:
– first screw by hand
– then tighten the sensor by
approx. ¼ turn using an open end
wrench (AF 17).
c. Push the inner pipe with the sensor into
the retractable pipe and screw the
tension sleeve to the inner pipe.
4. Screw the retractable pipe with the sensor
onto the assembly (clockwise, by hand).
5. Insert the measuring cable through the
protective tube and the KCl hood (pos. 7):
– Fixed cable:
from the sensor upwards to the
transmitter
– Sensor with plug-in head:
from the top through the KCl hood to the
sensor
6. Plug-in head sensor only:
Connect sensor and cable.
7. Connect the electrolyte supply tube (pos. 1)
to the electrolyte connection of the sensor.
8. Affix the supplied tubing support (pos. 9) to
the electrolyte supply tube directly above the
electrolyte connection.
9. Attach the KCl hood to the retractable pipe.
Guide the electrolyte supply tube through
the lateral slot of the hood.
10. Place the measuring cable in the splash
protection cap and place it on the protective
tube of the KCl hood.
Remove the sensor in the reverse sequence of
operations.
a0002804
Fig. 17: Liquid KCl electrolyte sensor installation
1 Liquid KCl supply tube
2 PML connection
3 Retractable pipe
4 Dummy plug
5 Stop lock bolt
6 Splash protection cap
7 KCl hood
8Plug-inheadcable
9 Tubing support
10 Sensor with liquid KCl connection
11 Inner pipe
12 Tension sleeve
1
2
3
4
7
8
11
512
10
9
6

Operation Cleanfit P CPA472
18 Endress+Hauser
4Operation
4.1 First commissioning
Before the first commissioning, make sure of the following items:
• All seals are correctly seated (on the assembly and process connection).
• The sensor is correctly installed and connected.
• The water supply line is correctly connected to the rinse connections (if fitted).
• The limit position switches (according to assembly version) are correctly connected.
#Warning!
Danger of squirting medium.
Before applying compressed air to the pneumatic assembly, make sure the connections are correctly
fitted with either rinsing hoses or dummy plugs. Otherwise the assembly may not be put into the
process!
4.2 Operating elements
Use the stop lock bolt to lock or release the retractable pipe (Fig. 18, Fig. 19).
When using manually operated assemblies, the retractable pipe can be locked in both, the
"Measuring" position and the "Service" position. When using pneumatically operated assemblies,
this can only be done in the "Service" position.
Releasing the stop lock bolt:
1. Pull the bolt out.
2. Turn the bolt by 90° so that the plastic grooves rest on the metal edge.
Locking the stop lock bolt:
3. Turn the stop lock bolt through 90° so that the plastic grooves are located above the recesses.
4. When the retractable pipe is turned clockwise, the bolt engages.
a0002744
Fig. 18: Releasing the stop lock bolt
a0002745
Fig. 19: Locking the stop lock bolt
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Cleanfit P CPA472 Operation
Endress+Hauser 19
4.3 Manual operation
Moving the assembly from the "Service" position to the "Measuring" position
1. Release the stop lock bolt catch.
2. Push the retractable pipe so that the sensor holder is inserted fully into the process.
3. Lock the sensor holder with the stop lock bolt. This prevents the retractable pipe from
returning inadvertently into the "Service" position.
#Warning!
Risk of injury!
Always lock the sensor holder. Otherwise, the retractable pipe may exit uncontrolled as a result of
the process pressure and injure somebody.
Moving the assembly from the "Measuring" position to the "Service" position
1. Release the stop lock bolt catch.
2. Pull the retractable pipe out as far as possible ("Service" position).
3. Lock the sensor holder with the stop lock bolt.
4. Complete the necessary service tasks.
4.4 Pneumatic operation
Operation of the pneumatic version depends on the used control unit. Refer to the operating manual
of the control unit for instructions.
"Caution!
• During maintenance work (e.g. installing and removing the sensor), always lock the assembly in
the "Service" position by the stop lock bolt.
• During the automatic rinse process, do not lock the retractable pipe by the stop lock bolt.
Otherwise the assembly can no longer move automatically to the "Measuring" position.
• If a maintenance switch is fitted on the transmitter, set it to "Maintenance" or "Service".
!Note!
It is not possible to lock the assembly in the "Measuring" position. The pneumatic system
maintains the back pressure to the process pressure.

Maintenance Cleanfit P CPA472
20 Endress+Hauser
5 Maintenance
#Warning!
Risk of injury!
Before starting maintenance work on the assembly, make sure that the process line and the tank are
depressurized, empty and rinsed.
Move the assembly to the "Service" position and lock the retractable pipe by the stop lock bolt.
5.1 Cleaning the assembly
To ensure a reliable measurement, the assembly and the sensor must be cleaned at regular intervals.
The frequency and intensity of the cleaning operation depend on the process medium.
5.1.1 Manually operated assembly
All parts in contact with the medium, e.g. the sensor and the sensor holder, must be cleaned at
regular intervals. Remove the sensor1).
• Remove light dirt using suitable cleaning agents (see chapter "Cleaning agents").
• Remove severe fouling with a soft brush and a suitable cleaning agent.
• Remove persistant fouling by soaking in a liquid cleaner and if neccessary by cleaning with a soft
brush.
5.1.2 Pneumatically operated assembly
Pneumatically-controlled cleaning can be carried out regularly via the rinse connection and the
corresponding equipment, e.g. with the fully automatic cleaning and calibration system
Topcal S CPC300.
5.2 Cleaning the sensor
You have to clean the sensor:
• before every calibration
• regularly during operation
• before being returned for repair
You can remove and clean the sensor manually or perform cleaning during automatic operation2)
via the rinse connection.
!Note!
• Clean ORP electrodes only mechanically and with water, do not use any chemical cleaning
agents. These cleaning agents apply a potential to the electrode that takes several hours to decay.
This potential causes measuring errors.
• Do not use any abrasive cleaning agents. This can lead to irreparable damage of the sensor.
• After cleaning the sensor, rinse the rinse chamber of the assembly with copious amounts of water
(possibly distilled or de-ionised). Otherwise, remaining residues of cleaning agent can corrupt
measurement.
• If required, re-calibrate after cleaning.
1) in reverse sequence of operations to the installation procedure
2) with the corresponding assembly equipment only