YOKOGAWA SC25V-AGP25-120 User manual

IM12B06J01-40E-E
4th edition
Instruction
Manual
YOKOGAWA
Model SC25V
Combined 12mm sensor;
pH, Ref, LE and Temperature

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IM12B06J01-40E-E

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IM12B06J01-40E-E
CONTENTS
1. PREFACE 4
1.1 Introduction 4
1.2 ATEX/IECEx compliance 4
1.3 Unpacking & Checking 4
1.4 Warranty & Service 4
1.5 Serial Number definition 4
2. GENERAL SPECIFICATIONS 5
2.1 Measuring elements 5
2.2 Construction materials 5
2.3 Functional specifications 5
2.4 Operating range 5
2.5 Dynamic specifications 5
2.6 Sensor Dimensions 6
2.7 Equipment and protective systems for use in potentially explosive atmospheres 6
3. INSTALLATION 7
3.1 Typical installation 7
3.2 Preparing the sensor for use 7
3.3 Mounting the sensor 7
4. WIRING TO THE PH ANALYZER 9
5. GENERAL CALIBRATION AND MAINTENANCE PROCEDURE 9
5.1 Calibration for pH measurement 9
5.2 Maintenance 9
6. MODEL AND SUFFIX CODES 10
7. SPARE PARTS 10
7.1 Sealings 10
7.2 Adapters 10
8. APPENDIX 11
CHEMICAL COMPATIBILITY CHART 11

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IM12B06J01-40E-E
1. PREFACE
1.1 Introduction
This instruction manual provides information
for the installation and use of the SC25V,
combined 12mm glass sensor; pH, Ref, LE and
Temperature. The SC25V is the best choice
for the majority of typical process- and waste
water applications. The sensor is designed
with titanium liquid earth, increased electrolyte
reservoir and large surface area PTFE
diaphragm combined with a long pathway inner
junction resulting in a longtime stability and
prolonged lifetime.
1.2 ATEX/IECEx compliance
The model SC25V is intended for use in
potentially explosive atmospheres.
1.3 Unpacking & Checking
Upon delivery, unpack the sensor carefully
and inspect it to ensure it was not damaged
during shipment. If damage is found, retain
the original packing materials (including outer
box) and immediately notify the carrier and the
relevant Yokogawa sales office. Make sure the
Model Code on the sensor is the same as on
the packing list. The Model Code and Serial
Number are found on the VP-connector of the
sensor. Check that option(s) that were ordered
are also included.
1.4 Warranty & Service
Yokogawa products and parts are guaranteed
free from defects in workmanship and materials
under normal use and service for a period of
twelve months from the date of shipment from
the manufacturer. Individual sales organizations
can deviate from the typical warranty period,
and the conditions of sales relating to the
original purchase order should be consulted.
Damage caused by wear and tear, inadequate
maintenance, corrosion, or by the effects of
chemical processes are excluded from this
warranty coverage. In the event of warranty
claim, the defective goods should be sent
(freight paid) to the Service Department of
the relevant sales Organization for repair or
replacement (at Yokogawa’s discretion).
The following information must be included in
the letter accompanying the returned goods:
• Model Code and Serial Number.
• Original Purchase Order and Date.
• Length of time in service and description of
the process.
• Description of the fault and circumstances of
the failure.
• Process/environmental conditions that may
be related to the failure of the sensor.
• Statement as to whether warranty or
nonwarranty service is requested.
• Complete shipping and billing instructions for
return of material, plus the name and phone
number of a contact person that can be
reached for further information.
Returned goods that have been in contact with
process fluids must be decontaminated
and disinfected prior to shipment. Goods
should carry a certificate to this effect, for the
health and safety of our employees. Material
Safety Data sheets must be included for all
components of the process to which the
sensors/fittings have been exposed.
1.5 Serial Number definition
The Serial Number is defined by nine (9)
alphanumeric characters:
X1X2Production Location
X3X4Year/Month code
X5X6X7X8X9Tracking number
Example: N3P600028

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IM12B06J01-40E-E
2. GENERAL SPECIFICATIONS
2.1 Measuring elements
pH glass electrode
Silver/Silver Chloride reference
Titanium liquid earth
Pt1000 temperature sensor.
2.2 Construction materials
Wetted materials:
O-ring : Viton
Earth Ring : Titanium
Reference Junction : Porous PTFE
Measuring Sensor : Glass
Body Sensor : Glass, PEEK
2.3 Functional specifications
Isothermal point : pH 7
Glass impedance G-Glass
: 200 MΩ
Glass impedance L-Glass
: 775 MΩ
Reference system : Double junction, Ag/
AgCl with saturated KCI,
including Ag+ ion trap
Junction resistance : 0.2 to 5 kΩ
Temp. element : Pt1000 to IEC 751
Asymmetry potential: 8 ±15 mV
Slope : > 96 %
(of theoretical value)
Sensor length : 120 mm and 225 mm
Note: The temperature sensor included in the
SC25V is intended to provide indication
and cell compensation. The construction
has not been tested to the pressure
vessel standards required for plant
temperature control.
2.4 Operating range
pH : 0 to 14
Temperature
Type G-glass : -10 to 80°C
(14 to 176°F)
Type L-glass : +15 to 130°C
(59 to 266°F)
Pressure : 0 to 10 bar (0 to 145 psi)*
Conductivity :>10μS/cm
Storage temp. : -10 to 50°C (14 to 122°F)
*Damaging the screw thread might influence
the max process pressure.
Note: Specifications should not be considered
in isolation. For example the pH range
can be 2-12pH, where the measurement
is at elevated temperatures. For advice
about specific applications please
contact your local sales office.
2.5 Dynamic specifications
Response time pH step (7 to 4)
: < 15 sec for 90%
Response time temp step (10°C)
: < 90 sec for 90%
Stabilization time (0.02 pH unit/10 s)
: < 120 seconds
Table 1: Production Year code Table 2: Production Month code
Year Year code Year Year code Month Month code
2014 P 2026 3 January 1
2015 R 2027 4 February 2
2016 S 2028 5 March 3
2017 T 2029 6 April 4
2018 U 2030 7 May 5
2019 V 2031 8 June 6
2020 W 2032 9 July 7
2021 X 2033 A August 8
2022 Y 2034 B September 9
2023 Z 2035 C October A
2024 1 2036 D November B
2025 2 2037 E December C

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IM12B06J01-40E-E
2.6 Sensor Dimensions
Dimension according to DIN 19263:2007-05
Criteria : 120 mm version
L (below plug head) : 120 ± 2 mm
Ø shaft : 11.9 ± 0.1 mm
Criteria : 225 mm version
L (below plug head) : 225 ± 2 mm
Ø shaft : 11.9 ± 0.1 mm
Concentricity : < 0,25 mm (centerline plug
head - 25 mm from tip)
Perpendicularity : < 0,5 mm (plug head
- 25 mm from tip)
Cilindricity : < 0,5 mm (centerline
sensor)
Criteria : All types
All measuring elements within 25mm from tip.
Figure 1
2.7 Equipment and protective systems
for use in potentially explosive
atmospheres
ATEX: II 1 G Ex ia IIC T3...T6 Ga
EU-type Examination Certificate
Number: DEKRA 11ATEX0014 X
IECEx: Ex ia IIC T3...T6 Ga
IECEx Certificate of Conformity
Cert. No: IECEx DEK 11.0064X
pH sensor series SC25V for connection to a
certified associated pH transmitter are used
for measurement of pH and temperature.
Ambient temperature range:
-40°C to +40°C for temp. class T6,
-40°C to +55°C for temp. class T4 and T5,
-40°C to +105°C for temp. class T3,
Electrical data
For the models without ID-chip the I/O
signals are from/to an associated intrinsically
safe certified pH transmitter (e.g. Yokogawa
transmitter Model FLXA21 series or
Yokogawa transmitter Model PH202S series).
For the models with ID-chip the I/O signals
are from/to an associated intrinsically safe
certified pH transmitter, Yokogawa Smart
Adapter Model SA11-P1.
Sensor input circuits:
In type of protection intrinsic safety Ex ia IIC,
only for connection to a certified intrinsically
safe circuit, with maximum values:
Ui=18 V; Ii=170 mA; Pi=0.4 W; Li=0 mH;
Ci=0 nF (without ID-chip)
Ci=0.4 nF (with ID-chip)
Special conditions for safe use:
For ambient temperature see above.
Electrostatic charges of the sensor enclosure
parts and label shall be avoided, especially
in the case that the process medium is non-
conductive. Use a damp cloth for cleaning
the equipment.
Note: When the sensor has been connected
to none intrinsically safe equipment
or equipment which exceeds the
restrictions regarding the sensor input
circuit, the sensor is not suitable for
intrinsically safe use anymore.
120±2.0 / 225±2.0
PG13.5
DIN: 40430
Wrench 19
Variopin
ø11.9±0.1
< ø10.8
<25.0
S
N
C
3
2
P
5
6
V
0
-A
00
IP67
173±2.0 / 278±2.0
Dimensions in mm

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IM12B06J01-40E-E
Figure 2
Figure 3
Figure 4
Figure 5
3. INSTALLATION
3.1 Typical installation
The SC25V sensor can be installed in-line, in a
bypass loop or in an immersion assembly. For
best results the SC25V should be mounted
with the process fluid flowing towards the
sensor and positioned at least 15° above the
horizontal plane to eliminate air bubbles in the
glass bulb. See fig. 6 section 3.3
3.2 Preparing the sensor for use
Remove the sensor from its shipping box and
slide off the “wet pocket” (the flask including
the rubber ring). This wet pocket is filled with
a weak acid and saline solution to prevent the
sensor from drying out during storage and
making sure it is ready for immediate use.
During shipment, electrolyte in the sensor
could be dislocated. To correct this, place the
sensor upright for 24 hours.
Before mounting the sensor, it should be
validated with buffer solutions and calibrated
when necessary. The specific calibration
procedure is described in the Instruction
Manual of the pH transmitter, but a general
procedure is also provided in section 5 of this
manual.
3.3 Mounting the sensor
The SC25V can be mounted using:
• PR10 retractable fitting (see fig 2).
• FF20 flow fitting / FS20 subassembly / FD20
immersion fitting (see fig 4)
• For mounting in Yokogawa fittings, a PG13.5
to M25 adapter is available in different
materials (see fig 3). More information in
chapter 7.
• PD20 immersion fitting / PF20 flow fitting /
PS20 flow fitting (see fig 5)
• FF40 fitting with PG13.5 adapter (K1523JA/
JC) or the small flow fitting K1598AC with
PG13.5 adapter (K1523JB/JD), (see fig 7).
PR10
O-RING VITON 11x3
SC25V
O-RING 11 x 3
SLIDE RING
RYTON
SC25V
K1520JN, K1520JP
K1500DV
FD20 / FF20 / FS20
2 x O-RING 11x3
K1520JN
K1520JP
K1500DV
SC25V
PD20 / PF20 / PS20
O-RING 11 x 3
SLIDE RING
RYTON
SC25V

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IM12B06J01-40E-E
Figure 6 Figure 7
15°
Minimum
Position
.
Ø 36
Ø 54
32
231
20
PG13.5
10
5
ø30
ø36
ø30
3/4” NPT
1/4” NPT
1/4” NPT
30 (1.18”)
100 (3.94”)
Ø30
PG 13.5
60
153 (6.0”)
PG13.5 adapter
K1523JB/JD
PG13,5 adapter
K1523JA/JC
Conductivity
Flow Fitting
FF40
SC4A
option
/FF
K1523JA K1598AC
Flow fitting FF40 with K1523JA/JC
Adapter to fit sensors with a PG13.5
process connection in FF40/FS40 and
FD40 fittings.
Flow fitting option /FF K1598AC
(incl. 3.1 certificate) with Adapter
K1523JB/JD to fit sensors with PG13.5
process connection.
Position
Dimensions in
mm (inches)

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IM12B06J01-40E-E
4. WIRING TO THE PH ANALYZER
For wiring to the pH analyzer please check the IM 12B06W02-02E-E and the IM of the relevant analyzer.
Sensor VP connection
5. GENERAL CALIBRATION AND MAINTENANCE PROCEDURE
5.1 Calibration for pH measurement
To calibrate a pH sensor, at least two buffer
solutions with known pH values are required. It
is recommended to use one buffer solution with
a value of pH=7. The second buffer solution
should be either acidic (pH<7) or alkaline
(pH>7), depending on the process value to be
measured. Example buffer solutions are the IEC
buffers with pH=4.01, pH=6.87 and pH=9.18.
The following is a general 2-point calibration
procedure:
1 Clean the sensor (deposits may be removed
using a 5% HCl-solution).
2 Rinse sensor thoroughly with clean water.
Carefully slap out residual fluid drops.
3 Immerse the sensor in the first buffer
(pH=6.87 buffer is recommended).
4 Refer to appropriate Instrument Instruction
Manual for detailed instrument calibration
input settings (Auto; Manual; Sample, etc.),
5 Rinse sensor thoroughly with clean water.
Carefully slap out residual fluid drops.
6 Immerse the sensor in the second buffer
(pH=4.01 buffer or pH=9.18 buffer
recommended).
7 Repeat Step 3.
Most instruments automatically correct the
measured pH value at process temperature to
a pH-value at a standard temperature of 25°C.
After the calibration is complete, replace or
re-install the sensor into the process.
5.2 Maintenance
Cleaning the electrodes
When the sensitivity of the electrode has
decreased or the response has slowed down,
the electrode should be cleaned. If cleaning
with hot water is not sufficient, more aggressive
water based agents should be used.
Examples:
• Deposits of lime, hydroxides or carbonates
can be removed by immersing the sensor in
or a dilute solution of hydrochloric acid (5% is
recommended). Afterwards rinse with water.
• Deposits of oils and fats can be removed with
hot water in conjunction with a detergent.
When the results are unsatisfactory, a mild
(carbonate based) abrasive can be used.
B (Ref.)
E (Temp 1)F (Temp 2/GND ID)
D (LE)
A (pH)
G (VCC ID)
H (DATA ID)
B (Ref.)
E (Temp 1)F (Temp 2)
D (LE)
A (pH)
Figure 8: VP connection diagram
SC25V-A*P25 (6 pins)
Figure 9: VP connection diagram
SC25V-B*P25 (8 pins)

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6. MODEL AND SUFFIX CODES
SC25V sensor
Model Suffix Code Description
SC25V Combined 12mm sensor: pH, Ref, LE, Temp.
Equiped with Variopin connector
Sensor type -AGP25 General purpose, Analog, IS for ATEX/IECEx
-ALP25 High temp. Chemical resistant, Analog, IS for ATEX/IECEx
-BGP25 General purpose, SENCOM ID-chip, IS for ATEX/IECEx
-BLP25 High temp. Chemical resistant, SENCOM ID-chip, IS for ATEX/IECEx
Sensor length -120 120 mm
-225 225 mm
7. SPARE PARTS
7.1 Sealings
Prod. No. Description
K1500BV O-RINGS EPDM 11X3 (6 PCS.)
K1500BZ O-RINGS VITON 11X3 (6 PCS.)
K1500GR O-RINGS SILICON 11X3 (8PCS)
K1524AA Set of O-ring 11x3 and slide ring Ryton
FP20-R12 Blind plug set for 1-hole
7.2 Adapters
Prod. No. Description
K1523JA Adapter Pg13.5 in F*40 PPO
K1523JC Adapter Pg13.5 in F*40 SS
K1520JN Adapter M25x1.5 - PG13.5 PVC
K1520JP Adapter M25x1.5 - PG13.5 RVS
K1500DV Adapter M25x1.5 - PG13.5 PVDF
K1523JB Adapter PG13.5 to ¾”NPT PPO
K1523JD Adapter PG13.5 to ¾"NPT SS
K1598AC Flow fitting (3.1), for SC4A (In combination with K1523JB/JD)
K9148NA Adapter for mounting Pg13.5-sensors in HA405-120-S3
K9148NB Adapter for mounting Pg13.5-sensors in HA405-120-PP
K9148NC Adapter for mounting Pg13.5-sensors in HA405-120-PV