Endress+Hauser UniFit CPA 441 User manual

BA 026C/07/en/06.99
No. 51500738 UniFit H
CPA 441
Process Assembly for
pH/Redox Measurement
Operating Instructions
Hauser+Endress
Nothing beats know-how
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uality made by
Endress+Hauser
ISO 9001

Table of contents
1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Symbols used ............................................................. 2
1.2 Storage and transport ....................................................... 2
1.3 Unpacking ................................................................ 2
1.4 Packaging and disposal ..................................................... 2
1.5 Product structure ........................................................... 3
2 Safety............................................................... 4
2.1 Intended use .............................................................. 4
2.2 General safety notes ........................................................ 4
2.3 Installation, start-up, operation ................................................ 4
2.4 Safety features ............................................................. 5
2.5 Notes for installation in pressurised systems...................................... 5
3 Installation........................................................... 6
3.1 Measuring system .......................................................... 6
3.2 Dimensions ............................................................... 6
3.3 Mounting positions and mounting versions ....................................... 7
3.4 Installation or replacement of electrode and mounting of measuring cable .............. 8
3.5 Filling with electrolyte....................................................... 10
4 Maintenance........................................................ 12
4.1 Assembly cleaning......................................................... 12
4.2 Electrode cleaning ......................................................... 12
4.3 Calibration ............................................................... 13
4.4 O-ring replacement ........................................................ 14
5 Accessories and spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Technicaldata....................................................... 16
7 Index............................................................... 17
PA441E00.CHP
UniFit H CPA 441 Table of contents
Endress+Hauser 1

1 General information
1.1 Symbols used
Warning:
This symbol alerts to hazards.
Failure to observe these warnings
may result in injury or damage to
equipment.
Note:
This symbol indicates important
items of information. Ignoring this
information may result in malfunction.
1.2 Storage and transport
The packaging material used to store or
transport the assembly must provide shock
protection. Optimal protection is provided by
the original packaging materials.
The ambient conditions also have to meet the
requirements (see Technical data).
1.3 Unpacking
Verify that the packaging and contents
are undamaged! Inform the post office or
freight carrier of any damage. Damaged
merchandise must be retained until the
matter has been settled.
Check that the delivery is complete and agrees
with the shipping documents and your order
(refer to nameplate for type and version).
The delivery comprises:
•Assembly UniFit H CPA 441
•Size 17 socket wrench
•Built-in adapter, as per your order already
mounted or separate
•Operating instructions BA 026C/07/en.
Keep the original packaging materials for
future storage or shipping of the assembly.
If you have any questions, consult your
supplier or the Endress+Hauser sales
agency in your area (see back cover of
these operating instructions for addresses).
1.4 Packaging and disposal
Package the assembly properly for reuse at
a later point in time. Optimal protection is
provided by the original packaging materials.
Observe local regulations for disposal.
General information UniFit H CPA 441
2Endress+Hauser

1.5 Product structure
O-ring / body / protection guard
11 EPDM / PVC / screw-in (only version A)
12 EPDM / PVDF / screw-in (only version A)
13 EPDM / 1.4571 (SS 316Ti) / screw-in
14 EPDM / 1.4571 (SS 316Ti) / plug-in
23 Viton / 1.4571 (SS 316Ti) / screw-in
24 Viton / 1.4571 (SS 316Ti) / plug-in
Mounting version
A Without adapter
F Adapter 1.4571 (SS 316Ti) / DN 25, G 1¼ / straight
G Adapter 1.4571 (SS 316Ti) / DN 25, G 1¼ / oblique
I Adapter 1.4571 (SS 316Ti) / dairy fitting DN 40
K Adapter 1.4571 (SS 316Ti) / Tri-Clamp 2"
L Adapter 1.4571 (SS 316Ti) / Varivent for DN 40 ... 125 (only version 14)
CPA 441- complete order code
pH/redox process assembly UniFit H CPA 441
PA441E01.CHP
UniFit H CPA 441 General information
Endress+Hauser 3

2 Safety
2.1 Intended use
The pH/redox process assembly UniFit H
CPA 441 is intended for applications where
the components in contact with medium must
be steam-sterilised. Typical areas of application
are fermenters, food industry, highly pasty
media and media with very low conductivity.
The assembly consists of a built-in part and
a vessel filled with liquid electrolyte. The cap
of the electrolyte vessel contains the thread
which will hold the electrode, a manometer
and a screw coupling for the compressed-air
connection. This quick-release coupling also
serves as opening for refilling the electrolyte.
It is not necessary to remove the assembly or
the electrode to refill. The pressure may be
applied by compressed air or a manual pump.
It is the operator’s responsibility to assure that
the following safety regulations are observed:
•Regulations for explosion protection
•Regulations for installation
•Operating conditions for the device and its
materials
•Local standards and regulations.
2.2 General safety notes
The assembly CPA 441 has been designed
for safe operation according to the state of the
art in engineering and according to current
regulations and European standards (see
Technical data).
However, if used improperly or other than for
the intended purpose, it may be dangerous,
e.g. due to incorrect installation or incorrect
operating conditions.
Warning:
•Operating this assembly in any
way other than described in these
instructions may compromise
the safety and function of the
measuring system.
•The notes and warnings in these
operating instructions must be
strictly adhered to.
2.3 Installation, start-up, operation
Warning:
•This device may only be installed,
connected electrically,
commissioned, operated and
serviced by properly trained
personnel authorised by the
system operator.
•The personnel must be familiar
with these operating instructions
and must adhere to the
instructions contained therein.
•When this assembly is used in an
explosive atmosphere, adherence
to the applicable regulations is
mandatory.
•Check that all connections have
been properly made before
powering up the system.
•Damaged assemblies that may be
dangerous must not be operated
and should be clearly identified as
being defective.
•Any troubleshooting of the
measuring system must be
performed exclusively by
authorised, trained personnel.
•If faults cannot be remedied, the
assembly must be removed from
service and secured to prevent
accidental start-up.
•Repairs not described in these
operating instructions may only
be performed directly at the
manufacturer’s works or by
the Endress+Hauser service
organisation.
Safety UniFit H CPA 441
4Endress+Hauser

2.4 Safety features
Safety devices
The assembly is protected against external
influences and damage by media-resistant
materials.
2.5 Notes for installation in pressurised systems
Warning:
•The maximum operating pressure
of the assembly must not be
exceeded.
•The system must be depressurised
before installation or removal of
the assembly.
•Couplings, cocks and lines must
be checked for leakage and
damage at regular intervals.
PA441E02.CHP
UniFit H CPA 441 Safety
Endress+Hauser 5

3 Installation
3.1 Measuring system
A complete measuring system comprises:
•the UniFit H CPA 441 assembly
•a combined pH/redox electrode,
length 225 mm
•a measuring cable CPK 1 or CPK 7
(terminated)
•a pH/redox measuring instrument
and optionally
•a junction box VBA and a measuring cable
(not terminated) for measuring cable
extension.
3.2 Dimensions
PA441SYS.CDR
Protection sleeve
Junction box VBA
UniFit H CPA 441 assembly
Measuring cable
Skintop gland Pg 16
PM connection
Electrode holder
Electrode
pH measuring instrument
MyPro CPM 431
Protection guard
Fig. 3.1 Example of a complete
measuring system
Rd 65 ×1/6“
Á
AD-MI.CDR
2
3
4
20
91
66
1
DN 40
∅25
Required mounting clearance approx. 550
approx. 405
66
20
91
50
∅80
1
2
4
5
6
7
8
9
10
11
∅25
Manometer
∅42
3
À
PA441-03.CDR
Fig. 3.2 À Mounting version:
Adapter DN 25
1 Splash protection cap
with cable entry
2 Protection sleeve
3 Connection for
compressed-air tube
ID 6 / OD 8
or ∅5 mm connection
forairpump,max.8bar
4 KCl refilling
5 Filling mark
6 Pressure vessel,
transparent
7 PM connection
8CouplingnutG1¼
Material:
1.4571 (SS 316Ti)
9 Built-in adapter,
straight or oblique
10 Electrode,
shaft length 225 mm
11 Protection guard
Á
Mounting version:
Dairy fitting DN 40
1 Taper fitting
2 Coupling nut F 40,
DIN 11851
3 Electrode
4 Protection guard
Â
Mounting version:
Varivent adapter
1 Clamp fitting
2 Electrode
Â
AD-VV.CDR
1
2
20
30
48.2
3
∅75
∅24
∅71
∅84
Installation UniFit H CPA 441
6Endress+Hauser

3.3 Mounting positions and mounting versions
The UniFit H CPA 441 assembly is installed
with the selected adapter.
Note:
•The permissible range of mounting
positions comprises inclinations of
the central axis of the assembly
that do not fall below 15°from the
horizontal (see Fig. 3.3). Ensure
that the electrode contacts the
medium to be measured. With
inclined mounting, the change in
the usable electrolyte volume must
be considered (see chapter 3.5).
•The assembly must always be
installed in such a way that the
manometer and the compressed-air
connection are located at the
highest point and do not contact
the electrolyte. Select an installation
site that will allow easy removal of
the quick-release coupling and will
facilitate pressure readings. Ensure
adequate mounting clearances for
removal, installation, cleaning and
maintenance.
Built-in adapter
The UniFit H CPA 441 assembly is introduced
into the adapter –which may be welded on
or glued on –and hand-tightened with the
coupling nut. During installation, ensure that
the O-ring is properly seated and clean.
The sealing surface of the built-in adapter
must be protected against mechanical
damage. To permit use in food applications,
an Endress+Hauser built-in adapter should
be used (see Fig. 3.4 and Fig. 3.5).
However, adapters from other manufacturers
are basically usable as well. When installing
the assembly in built-in adapters of less than
50 mm in length, the O-ring must be inserted
in the second O-ring seat located further up.
You should therefore avoid using pointed or
sharp tools to change the O-rings.
Permissible
range
15°
PA441-EB.CDR
Impermissible
range
Fig. 3.3 Permissible mounting
positions for CPA 441
G 1¼
AD-25GV.CDR
∅42
50
Fig. 3.4 Built-in adapter, straight
AD-25SP.CDR
G 1¼
49
∅42
59
15°
Fig. 3.5 Built-in adapter, oblique
PA441E03.CHP
UniFit H CPA 441 Installation
Endress+Hauser 7

Varivent adapter and dairy fitting
The versions of the UniFit H CPA 441 with
Varivent adapter or dairy pipe fitting meet
the requirements of the corresponding DIN
standards, which must also be fulfilled by
the counterparts. Observe the relevant
regulations for installation. As a general rule,
always ensure that the sealing elements are
properly seated, clean and intact.
Protection guard
•The UniFit H CPA 441 assembly can be
equipped with a protection guard (see
Fig. 3.2) if desired.
•All versions are screwed in.
•Stainless steel versions are optionally
plugged in.
•With the protection guard screwed in,
even the stainless steel versions are no
longer suitable for food applications.
3.4 Installation or replacement of electrode
and mounting of measuring cable
pH/redox electrodes with a Pg 13.5 threaded
plug-in head, a shaft length of 225 mm and a
shaft diameter of 12 mm can be fitted into the
assembly.
The sealing of the electrode is provided
•at the threaded plug-in head by an O-ring
and a clamping ring
•at the lower shaft end via the O-ring in the
hole of the assembly.
Warning:
•Always depressurise the assembly
before removing the electrode
(see chapter 3.5.2).
•Electrolyte present in the electrolyte
vessel must be emptied out first,
or it drains from the assembly
through the built-in part.
•With installed assembly, by all
means note the medium pressure!
Note:
•Make the electrode slidable before
screwing in. Wetting with water is
sufficient.
•During electrode installation,
ensure that both O-rings are
properly seated and clean.
•The rubber hoses above the
electrode holes must be removed
prior to installation. No air bubbles
must be visible in the lower part of
the electrode shaft. Shake the
electrode several times if required.
•Should the assembly remain dry
for an extended period after
electrode installation, then the
electrode tip must be kept moist,
e.g. in KCl solution (3 mol/l).
Installation UniFit H CPA 441
8Endress+Hauser

➀Pull off the splash protection cap
and unscrew the protection sleeve. ➁Screw the electrode into the electrode guide hand-tight and
then tighten it by a quarter turn
with a size 17 socket wrench.
➂Thread the measuring cable with
the electrode connector through
the protection sleeve.
➃Screw the electrode connector into
the threaded plug-in head on the
electrode.
➄Screw the protection sleeve back on. ➅Bend the measuring cable and
plug in the splash protection cap.
MOUNT01.CDR MOUNT02.CDR MOUNT03.CDR
MOUNT04.CDR MOUNT05.CDR MOUNT06.CDR
Fig. 3.6 Electrode installation and
mounting of measuring
cable
PA441E03.CHP
UniFit H CPA 441 Installation
Endress+Hauser 9