YOKOGAWA PR20-S, PR20-T User's Manual

User
Manual

Model PR20
Retractable fitting for
combined pH/redox electrodes

IM 12B6K3-E-E

9th Edition

IM 12B6K3-E-E

CONTENTS

1. GENERAL 2

1-1.Description 2
1-2.Features 2
1-3.Safety precautions 2

2. UNPACKING AND CHECKING 3

2-1.Unpacking and inspection 3
2-2.Mounting location 3
2-3.Specifications 4
2-4.Model and codes 5
2-5.Dimensions 8

3. INSTALLATION AND WIRING 9

3-1.General 9
3-2.Accessories 10
3-3.Preparing the electrode for use 10
3-4.Mounting the electrode 10
3-5.Probe insertion 12
3-6.Adjusting the iinsersion depth 13
3-7.Wiring 13

4. MAINTENANCE 14

4-1.General 14
4-2.Cleaning 14
4-3.Calibration 15
4-4.Replacing the electrode 16
4-5.Replacing the O-rings 16
4-6.Replacing the cable 17
4-7.Flush port connections 17

5. EXPLODED VIEW 19

6. SPARE PARTS LIST 20

IM 12B6K3-E-E

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1. GENERAL

1-1. Description

The retractable fitting with ball-valve
allows a safe insertion and retrac­tion of a combined pH/reference
electrode while the process is
under pressure. It can be mounted
in a variety of positions as long as
the electrode is in an almost vertical
position with the tip pointing down­ward (see fig. 2-1).

The insertion depth can be selected
on site. A minimum insertion depth
of 0.2 mtr. into the process liquid is
advised to have a fast temperature
response. A special 'memory' ring
is provided to remember the posi­tion of the electrode after retraction.
To protect any loss of process
liquid the mechanism for releasing
the probe is designed to operate
only when the ball-valve is closed.
The combined pH/reference elec­trode can be replaced or calibrated
easily. The especially designed
cable has integrated leads for the
temperature sensor, shielding and
liquid earth. The end is pre-finished
with cable endings for easy moun­ting to industrial transmitters.

1-2. Features

- A safe "through the valve" inser­tion and retraction design.

- Additional safety though a special
designed 'T-bar' locking mecha­nism.

- Maintenance, replacement and
calibration of the electrode without
interruption of the process.

- Adjustable insertion depth for
optimal measuring position in the
process.

- Easy replacement of the electrode.

- Improved sealing and damping by
addition O-rings.

- Integrated liquid earth and tempe­rature sensor (Pt100 or Pt1000 to
IEC 751 or DIN 43760).

- Simplified installation by optional
ball-valves with flanged or tapered
connections.

- Available in two different materials
and two different lengths (0.5 mtr.
and 1 mtr.)

1-3. Safety precautions

The PR20 has been designed to
give maximum safety in operation.
For optimum safety a flanged ball­valve is recommended.

Yokogawa does not accept any
claims or penalties on possible
damages or accidents which occur­red by operation of the PR20 fitting.

The installation of the probe is to be
implemented under the local safety
regulations for pressurised vessels
or pipe-lines for retraction or inser­tion. The instructions given in this
manual must be followed exactly.

IM 12B6K3-E-E

INCORRECT

15º

15º

HORIZONTAL

CORRECT

CORRECT

2. UNPACKING AND CHECKING

2-1. Unpacking and inspection

When you receive the PR20 retrac­table fitting it is packed in a card­board box. Open the box and
check that the model code on the
fitting is the same as on the pac­king list (see §2-4). The model code
with serial number of the fitting are
on an identification plate fixed on
the protection ring.
Also check that the options you
ordered are supplied. These options
are delivered in separate bags.
If you have any problems or
questions, please contact the
nearest Yokogawa service centre or
sales organisation for assistance.

2-2. Mounting location

The PR20 fitting is intended to be
used for in-line pH measurement.
When it is delivered with an optional
ball-valve or when it is used in com­bination with a locally purchased 1
inch ball-valve, the process does
not need to be interrupted for main­tenance of the sensor. The location
can be in a large diameter pipeline
or a vessel. The angle of the fitting
with the horizon should not be less
than 15 degrees (see fig. 2-1).

The pressure- and temperature
ratings of the electrode inside the
fitting determine the maximum
rating of the measurement point.

3

Fig. 2.1. Angle of fitting

Warranty

Yokogawa Europe B.V. warrants
that the goods delivered are made
from new materials to the best
workmanship available. Malfunction
of any of the delivered goods or
parts, can only lead to replacement
of the damaged parts. No claims
can be made to damages or acci­dents resulting from the use of the
goods. No claims can be made to
the expected or promised perfor­mance of the goods under any cir­cumstances.

Damaged goods or parts should be
sent to the local Service organisa­tion for warranty claim purposes.
Yokogawa has the right to deny
warranty claims after investigation
of the data and the materials.

IM 12B6K3-E-E

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2-3. Specifications
Materials (wetted parts)

Probe

Model PR20-S : Stainless steel AISI 316
Model PR20-T : Titanium

O-ring seals : Viton 70° shore

Silicone rubber 50° shore
Non-wetted : Stainless steel (AISI 316) and
parts polyphenylene sulphide (PPS)

1

/

Process conn. : 1

" BSP-female (see modelcode for other connections)

4

Insertion length :The dimensional drawing indicates the maximum

insertion length for both specified probe lengths.

Pressure/temperature ratings

Static conditions : 2 MPa at 20°C, 500 kPa at 125°C
Operating
conditions : max. 500 kPa, max. 100°C

Weight : Approx. 2.5 kg. (SS316 version without ball-valve)

Specification of the optional senors

SC21-AAP26 : 1 to 500 kPa at 0 to 110°C, (pH/ref electrode)
SC21-AGP26 : 1 to 500 kPa at 0 to 110°C, (pH/ref electrode)
SC21-ALP26 : 1 to 500 kPa at 0 to 110°C, (pH/ref electrode)
SC21-AGP24 : 1 to 500 kPa at 0 to 80°C, (pH/ref electrode)
SC29-PTP29 : 1 to 500 kPa at 0 to 110°C, (Redox/ref electrode)

IM 12B6K3-E-E

2-4. Model and codes

Model Suffix code Description

PR20 Retractable fitting
Material -S Stainless steel AISI 316

-T Titanium

Probe length*) -05 0.5 mtr.

-10 1 mtr.

Cable length -05 5 mtr.

-10 10 mtr.

Temp. sensor -T1 Pt1000

-T2 Pt100
Style *B Style code
Adapters /YYY See separate table
Certificates /M Material certificate 3.1B according to

EN-10-024 (DIN 50049) on wetted partsa

/T Test certificate for hydrostatic pressure

test (2 MPa at ambient temperature)
Combined /EB SC21-AAP26
electrode /EG SC21-AGP24

/EH SC21-AGP25

* Note: The insertion depth of the probe is given in the dimensional drawing.

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IM 12B6K3-E-E

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ISO 228/1-G 1

ISO 229/1-G 1 1/4

20 (0.78)

45 (1.77)

ISO 229/1-G 1 1/4

63 (2.55)

65 (2.56)

Options

Adapter Option code Drawing

Model PR20-S PR20-T

Adapter only

1" BSP-male /SBS /TBS A
1" NPT-male /SNS /TNS A
DIN flange DN25 PN16 /SDS /TDS B, C
ANSI flange 1" 150 lbs /SUS /TUS B, C

Adapters and ball-valve

1" BSP-female /SBB /TBB A, D
1" NPT-female /SNN /TNN A, D
DIN flange DN25 PN16 /SDD /TDD B, C, E
ANSI flange 1" 150 lbs /SUU /TUU B, C, E

Adapter with flush ports

DIN flange DN25 PN16 /SES /TES F,C
ANSI flange 1" 150 lbs /SVS /TVS

Adapter with flush ports and ball-valve

DIN flange DN25 PN16 /SED /TED F, C, E
ANSI flange 1" 150 lbs /SVU /TVU F, C, E

Weld in adapters

Straight welding /SWR
Angled at 15 degrees /SWA

A B

DR 1 - 11 1/2 NPT acc. ANSI B 1.20.1

IM 12B6K3-E-E