Yokogawa SC25V User Manual
Instruction
YOKOGAWA
Manual
Model SC25V
Combined 12mm sensor;
pH, Ref, LE and Temperature
IM12B6J1-40E-E
2nd edition
2
Table 1
Production year according to
DIN. IEC 60062
Year Yearcode
2010 A
2011 B
2012 C
2013 D
2014 E
2015 F
2016 G
2017 H
2018 J
2019 K
2020 L
2021 M
2022 N
IM12B6J1-40E-E
Year Yearcode
2023 P
2024 Q
2025 R
2026 S
2027 T
2028 U
2029 V
2030 W
2031 X
2032 A
2033 B
2034 C
2035 D
Table 2
Production month according to
DIN. IEC 60062
Month Monthcode
January 1
February 2
March 3
April 4
May 5
June 6
July 7
August 8
September 9
October O
November N
December D
TABLE OF CONTENTS
1. Preface 4
1.1 Introduction 4
1.2 ATEX/IECEx compliance 4
1.3 Unpacking and checking 4
1.4 Warranty and service 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 specification 5
2.6 Sensor dimensions 6
2.7 Equipment and protective systems 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
4.1 Cable marking and pin allocation 9
4.2 Instrument connection of sensor 9
4.3 Instrument connection setting for PH402G and PH202G(S) 9
4.4 Instrument connection setting for PH150, PH450 and FLXA21 9
4.5 Sensor VP connection 10
3
5. General calibration and maintenance procedure 10
5.1 Calibration for pH measurement 10
5.2 Maintenance 10
5.3 Chemical cleaning HCN 11
6. Model and suffix codes 12
6.1 SC25V sensor 12
6.2 Cable for Sensor with Variopin Connector 12
7. Spare parts 12
8. Appendix 13
Chemical Compatibility Chart 13
EC DECLARATION OF CONFORMITY 14
Application datasheet SC25V 15
IM12B6J1-40E-E
4
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 processand 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. A number of
restrictions apply on the use of this sensor.
All varieties of SC25V are ATEX certified:
II1G Ex ia IIC T3...T6 Ga (see chapter 2.7).
EC-type Examination Certificate Number:
DEKRA 11ATEX0014 X
IECEx-type Examination Certificate Number:
IECEx DEK 11.0064x
Special conditions for safe use:
For ambient temperature see chapter 2.7.
Electrostatic charges on the enclosure and
cable shall be avoided.
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.
IM12B6J1-40E-E
2. GENERAL SPECIFICATIONS
5
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
: 225 MΩ
Glass impedance L-Glass
: 600 MΩ
Reference system : Double junction, Ag/
AgCl with saturated KCI,
including Ag+ ion trap
Junction resistance : 0.2 to 10 kΩ
Temp. element : Pt1000 to IEC 751
Asymmetry potential : 8 ±15 mV
Slope : > 96 %
(of theoretical value)
Sensor length : 120 mm and 225 mm
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)
: < 5 sec for 90%
Response time temp step (25°C)
: < 90 sec for 90%
Stabilization time (0.02 pH unit/10 s)
: < 30 seconds
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.
IM12B6J1-40E-E
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