Endress+Hauser CleanFit P CPA 471 User manual

Quality made by
Endress+Hauser
ISO 9001
BA 217C/07/en/07.03
51502594 CleanFit P CPA 471
Retractable Process Assembly
Operating Instructions

CleanFit P CPA 471
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 . . . . . . . . . . . . . . . . . . 16
4 Operation . . . . . . . . . . . . . . . . . . . . . 17
4.1 First commissioning . . . . . . . . . . . . . . . . . . . . 17
4.2 Operating elements . . . . . . . . . . . . . . . . . . . . 17
4.3 Manual operation . . . . . . . . . . . . . . . . . . . . . . 17
4.4 Pneumatic operation . . . . . . . . . . . . . . . . . . . 18
5 Maintenance . . . . . . . . . . . . . . . . . . 19
5.1 Cleaning the assembly . . . . . . . . . . . . . . . . . 19
5.2 Cleaning the sensor . . . . . . . . . . . . . . . . . . . . 19
5.3 Cleaning agents . . . . . . . . . . . . . . . . . . . . . . . 20
5.4 Notes on calibration . . . . . . . . . . . . . . . . . . . . 20
6 Accessories . . . . . . . . . . . . . . . . . . . 21
6.1 Installation accessories . . . . . . . . . . . . . . . . . 21
6.2 Limit position switches . . . . . . . . . . . . . . . . . . 22
6.3 Pneumatic throttle . . . . . . . . . . . . . . . . . . . . . 22
6.4 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.5 Calibration solutions . . . . . . . . . . . . . . . . . . . 23
6.6 Measuring cables . . . . . . . . . . . . . . . . . . . . . 23
6.7 Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.8 Measuring, cleaning and calibration systems 24
6.9 Documentation . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.5 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8 Technical data . . . . . . . . . . . . . . . . . 31
8.1 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.3 Mechanical construction . . . . . . . . . . . . . . . . . 32
Index . . . . . . . . . . . . . . . . . . . . . . . . . 33

Safety instructions CleanFit P CPA 471
4Endress+Hauser
1Safetyinstructions
1.1 Designated use
The manually or pneumatically operated retractable assembly Cleanfit P CPA 471 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, electrical connection, commissioning, operation and maintenance of the
measuring system must only be carried out by trained technical personnel.
The technical personnel must be authorised for the specified activities by the system
operator.
•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 authorised 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 Endress+Hauser 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 Endress+Hauser
sales centre responsible.
Please use the original packaging, if possible.
Please enclose the completed Dangerous Goods sheet (copy the second last page of
these Operating instructions) with the packaging and also the shipping documents.

CleanFit P CPA 471 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 CPA 471
6Endress+Hauser
2 Identification
2.1 Nameplate
You can recognise the assembly version from the order code on the nameplate. Please
compare this with your order.
You can find the possible assembly versions and the resulting order code from 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 Endress+Hauser sales
centre responsible (see back page of these Operating Instructions).
C07-CPA471xx-18-07-00-en-001.eps
Fig. 1: Example of a nameplate
ENDRESS+HAUSER
CLEANFIT P CPA 471
order code:
serial no.:
spec.
pressure: PN=6 bar T=135°C
CPA471-C2A2B3H4
2 12718 02C12

CleanFit P CPA 471 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 1.4404 (AISI 316L) in contact with medium, with PA housing
(max. 6 bar/87 psi at 20 °C/68 °F or max. 80 °C/176 °F at 1 bar/14.5 psi)
B 1.4404 (AISI 316L) in contact with medium, with stainless steel 1.4404 (AISI 316L)
housing (max. 10 bar / 145 psi at 100 °C / 212 °F)
C 1.4404 (AISI 316L) in contact w. medium, with test cert. 3.1B acc. to EN10204, with
PA housing
D 1.4404 (AISI 316L) in contact w. medium, with test certificate 3.1B acc. to EN10204,
with 1.4404 (AISI 316L) housing
Seal material (in contact with medium)
1 EPDM (preferred for food application)
2FPM(Viton
®, preferred for process application)
3 KALREZ®
Process connection
A G 1¼ internal thread (union)
B NPT 1" external thread
C Tri-Clamp 2"
D Dairy fitting DN 50 (acc to. DIN 11 851)
G DN 50 flange
H 2" ANSI flange
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
CPA 471- complete order code

Installation CleanFit P CPA 471
8Endress+Hauser
3Installation
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 Endress+Hauser
sales centre responsible (see back page of these Operating Instructions).
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 H sensor, there are, in principle, no restrictions for the
installation position. An installation angle of 0 to 180° is, however, recommended.
C07-CPA47xxx-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 CPA 471 Installation
Endress+Hauser 9
C07-CPA471xx-17-07-00-xx-002.eps
Fig. 3: Installation examples with recommended installation angle (glass electrodes)
A Tank
B Pipe bend
C Horizontal pipe
D Ascending pipe
"
Caution!
•For all assemblies with stainless steel pressure cylinders, we recommend to use a
flanged version when installing with inclined orientation. Otherwise, the weight of the
assembly could affect the safety of the process connection.
•Avoid a siphon effect1at 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 CPA 471
10 Endress+Hauser
3.2.2 Dimensions
C07-CPA471xx-06-07-00-de-003.eps
Fig. 4: Short version
C07-CPA471xx-06-07-00-de-002.eps
Fig. 5: Long version
C07-CPA471xx-06-07-00-de-003.epsCPA 471
Fig. 6: Short version for
liquid KCl sensors
Stroke 67 / 2.64
Ø 80 / 3.35
Ø 30 / 1.18
Ø 58 / 2.28
192 / 7.56
101 / 3.98
G 1¼
Ø 25 / 0.98
Ø 18 / 0.71
35 / 1.38 125 / 4.92
40 / 1.57
mm / inch
Stroke 174 / 6.85
297 / 11.69
208 / 8.19
35 / 1.38
G 1¼
Ø 25 / 0.98
Ø 18 / 0.71
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 18 / 0.71
101 / 3.98
35 / 1.38
541 / 21.30
Ø 25 / 0.98
G 1¼
Ø 30/
1.18 Ø 80 / 3.35
40 / 1.57
160 / 6.30
mm / inch

CleanFit P CPA 471 Installation
Endress+Hauser 11
3.2.3 Process connections
C07-CPA471xx-04-07-07-en-001.eps
Fig. 7: CPA 471 process connections (short version, long version dimensions in brackets)
A G1 ¼ internal thread with thread nut
B NPT 1" external thread
C Triclamp 2"
D DN 50 dairy fitting
G/H DN 50 flange (DIN 1092-1) resp. ANSI 2" flange
3.3 Installation instructions
3.3.1 Measuring system
ABC
DG / H
approx. 44 / 1.73
101 / 3.98
(208 / 8.19)
87 / 3.43
(194 / 7.64)
66 / 2.60
(173 / 6.81)
92 / 3.62
(199 / 7.83)
101 / 3.98
(208 / 8.19)
approx. 44 / 1.73
approx. 44 / 1.73
mm / inch
C07-CPA471xx-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. CPK 9, CPK 12
Rinse block CPR 40 (optionally)
a
b
c
Electric line
Compressed air line
Water / cleaning agent / buffer
TopCal S CPC 300:1
1) Fully automatic calibration and cleaning system
Supply lines:
2
3
5
6
7
8
Transmitter Mycom S CPM 153
Control unit CPG 300
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 CPM 153
Power supply for CPG 300
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 CPA 471
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.
Move the assembly into the "Service" position (electrode holder inserted in the
assembly) and secure the assembly to the tank or the piping using your selected
process connection.
3.3.3 Compressed air connection1
The assembly is operated with an air pressure of 4 to 8 bar (58 to 116 psi). The air must
be filtered (40 µm) and be free of water and oil. There is no continuous air consumption.
The air lines must have a minimum nominal diameter of 4 mm (0.16 inch).
"
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. E+H offers such a throttle as an accessory (see chapter
"Accessories").
C07-CPA473xx-15-07-00-xx-005.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 CPA 471 Installation
Endress+Hauser 13
Limit position switches
Pneumatic 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 discribed
for TopCal S CPC 300 resp. TopClean S CPC 30 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"
➁TopCal/TopClean: hose no. 2
➂TopCal/TopClean: hose no. 3
➄TopCal/TopClean: hose no. 5
➅TopCal/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. ➁) to the upper G¼ pneumatics connection (Fig. 11).
2. Also, connect the compressed air supply line no. ➁to 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 ➄to
the limit position switch outlet).
4. Connect the compressed air supply line for "Assembly service" (TopCal/TopClean:
hose no. ➂) to the lower G¼ pneumatics connection.
5. Also, connect the compressed air supply line no. ➂to the inlet (1) of the upper limit
position switch (S2, via T-piece). This limit position switch supplies the position
feedback signal "Assembly service".
Pneumatic: 3/2 way valve
Electric: inductive (NAMUR type)
C07-CPA471xx-04-07-08-xx-001.eps
Fig. 10: Limit position switches, left: pneumatic (1 = compressed air inlet, 2 = compressed air outlet)
right: electric (NAMUR)
2
1
1 / BN L+→
2 / BU L–→
1
2
1
2
M1
S1
S2
M2
2
3
TopCal /
TopClean
TopCal /
TopClean
6
5

Installation CleanFit P CPA 471
14 Endress+Hauser
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. ➅).
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 Mycom S CPM 153, as an example.
3.3.4 Rinse water connection
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.
Operate the rinse water connection of the assembly with a water pressure of 2 to
max. 6 bar (29 to 87 psi). In addition, install a non-return valve and a dirt trap in the water
supply line.
"
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.
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.
3.3.5 Sensor installation
C07-CPA472xx-04-07-03-xx-002.eps
Fig. 12: Electric limit position switches to CPM 153
A
B
NAMUR "Assembly service"
NAMUR "Assembly measuring"
+
+
–
–
11 12 13 14 A
B
1. Before installing a sensor, remove the
dummy plug from the assembly.
2. Remove the yellow protection cap of
the sensor.
Make sure the sensor shaft is fitted with
the O-ring (Fig. 13, A) and the thrust
collar (B).
3. Moisten the sensor shaft before
installing the sensor.
C07-CPSxxxxx-11-05-00-xx-001.eps
Fig. 13: Sensor installation
B
A

CleanFit P CPA 471 Installation
Endress+Hauser 15
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.
4. Remove the splash protection cap (Fig. 15, position 5) from the assembly.
5. Then loosen the retractable pipe (position 2) by turning it anticlockwise.
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.
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. 14, A).
3. Turn the retractable pipe clockwise
until the stop lock bolt engages (B).
C07-CPA47xxx-19-07-00-xx-001.eps
Fig. 14: Stop bolt
A Step 2,see left
BStep3
AB
6. Remove the dummy plug (position 3).
7. Screw the sensor or the electrode
(position 7) into the sensor holder by
hand.
8. Tighten the sensor using a socket
wrench (AF 17) by approx. ¼ turn.
9. Insert the measuring cable from the top
through the retractable pipe (pos. 2).
10.Plug the measuring cable into the
sensor plug-in head using the cable
plug (position 6) and tighten it by hand.
11.Screw the retractable pipe back onto
the pressure cylinder (clockwise, by
hand).
12.Place the measuring cable in the
splash protection cap and place it on
the retractable pipe.
13.Push the PML connector onto the PML
connection (PML = potential matching
line, position 1).
14.Release the stop lock bolt catch by
pulling it out and turning it by 90°.
Remove the sensor in the reverse
sequence of operations.
C07-CPA473xx-09-07-06-xx-002.eps
Fig. 15: 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
a
b

Installation CleanFit P CPA 471
16 Endress+Hauser
"
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.
19. Release the stop lock bolt catch (pull it out and turn it by 90°).
Remove the sensor in the reverse sequence of operations.
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.
4. Remove the splash protection cap
(Fig. 16, position 6) and the KCl hood
(position 7) from the assembly.
5. Then slacken the retractable pipe by
turning it anticlockwise.
6. Unscrew the tension sleeve
(position 10).
7. Remove the sensor holder (position 9)
from the retractable pipe.
8. Screw the sensor into the sensor holder
by hand.
9. Tighten the sensor using a socket
wrench (AF 17) by approx. ¼ turn.
10.Push the sensor holder with the sensor
into the retractable pipe.
11.Insert the tension sleeve from the
bottom into the retractable pipe and
screw it to the sensor holder.
12.Screw the retractable pipe with the
sensor onto the assembly (by hand).
13.Insert the measuring cable from the top
through the protective tube and the KCl
hood (position 7).
14.Screw the measuring cable onto the
sensor plug-in head and tighten it by
hand.
15.Push the PML connector onto the PML
connection (PML = potential matching
line, position 2).
16.Insert the electrolyte supply tube
(position 1) through the KCl hood and
connect it to the electrolyte connection
of the sensor.
17.Attach the KCl hood to the retractable
pipe.
18.Place the measuring cable in the
splash protection cap and place it on
the protective tube of the KCl hood.
C07-CPA473xx-09-07-06-xx-003.eps
Fig. 16: Liquid KCl electrolyte sensor installation
1 Liquid KCl supply tube
2 PML connection
3 Retractable pipe
4 Dummy plug (a = inserted, b = not inserted)
5 Stop lock bolt
6 Splash protection cap
7 KCl hood
8 Sensor with liquid KCl connection
9 Sensor holder
10 Tension sleeve
1
2
3
4
7
8
9
a
b
5
6
10

CleanFit P CPA 471 Operation
Endress+Hauser 17
4 Operation
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. 17, Fig. 18).
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.
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.
C07-CPA47xxx-19-07-01-xx-002.eps
Fig. 17: Releasing the stop lock bolt
C07-CPA47xxx-19-07-01-xx-003.eps
Fig. 18: Locking the stop lock bolt
12
34

Operation CleanFit P CPA 471
18 Endress+Hauser
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 control fitted. Refer to the control
operating manual for instructions.
"
Caution!
•During maintenance work (e.g. installing and removing the sensor), always lock the
assembly in the "Service" position by the stop bolt.
•During the automatic rinse process, do not lock the retractable pipe by the stop 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.

CleanFit P CPA 471 Maintenance
Endress+Hauser 19
5 Maintenance
#
Warning!
Risk of injury!
Before starting maintenance work on the assembly, make sure that the process line and
the tank are depressurised, 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 CPC 300.
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 in automatic
operation2via the rinse connection.
!
Note!
•Clean redox 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

Maintenance CleanFit P CPA 471
20 Endress+Hauser
5.3 Cleaning agents
The selection of the cleaning agent is dependent on the degree and type of
contamination. The most common contaminations and the suitable cleaning agents are
listed in the following table.
"
Caution!
Do not use organic solvents containing halogen or acetone. These solvents could
destroy plastic components of the assembly or the sensor and it is also partly
suspected that they cause cancer (e.g. Chloroform).
5.4 Notes on calibration
Regular sensor calibration is vital for reliable measurement. The calibration cycles
depend on the range of applications and the desired accuracy.
You have to define the calibration cycles separately for each application. At the start,
perform calibration frequently (e.g. weekly) to determine the operating characteristics
of the sensor.
Follow the corresponding instructions for calibration in the Operating Instructions of the
transmitter used.
!
Note!
•The calibration cycles depend on the process conditions and the medium.
•When using a symmetrical connection, there must be an electrical connection
between the potential matching (PML) and the buffer solution.
•Do not allow a glass electrode to stand dry or pH sensors (including ISFET) to stand
in distilled water.
•Do not use compressed air to blow clear automatic calibration systems with ISFET
sensors.
Type of contamination Cleaning agent
Greases and oils Substances containing tensides (alkaline)1or
water-soluble organic solvents (e.g. Ethanol)
1) do not use for the TopHit ISFET sensor! Instead, use commercially available acidic cleaning agents for
the food industry (e.g. P3-horolith CIP, P3-horolith FL, P3-oxonia active).
Calciferous deposits, metal hydroxide
deposits, lyophobic biological deposits
approx. 3% hydrochloric acid
Sulphide deposits Mixture of 3% hydrochloric acid and thiocarbamide
(commercially available)
Protein deposits Mixture of 3% hydrochloric acid and pepsin (commercially
available)
Fibres, suspended substances Water under pressure, poss. with surface-active agents
Light biological deposits Water under pressure