Yokogawa SC25F User Manual

Instruction
Manual

Model SC25F
pH SENCOM™ sensor

IM 12B6J1-41E-E

2nd edition

2

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IM 12B6J1-41E-E

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IM 12B6J1-41E-E

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IM 12B6J1-41E-E

Contents

1. PREFACE 6

1.1 Introduction 6

1.2 Unpacking and Checking 6

1.3 Warranty and Service 6

1.4 Serial Number definition 7

2. GENERAL SPECIFICATIONS 8

2.1 Measuring elements 8

2.2 Wetted parts 8

2.3 Functional specifications (at 25°C) 8

2.4 Dynamic specifications 8

2.5 Operating range 8

2.6 Transmission signal (Data + and Data -) 9

2.7 Power supply (Supply+ versus Supply Gnd) 9

2.8 Regulatory standards 9

2.9 Shipping details 12

2.10 Environment and operational conditions 12

3 INSTALLATION OF SC25F 13

3.1 Typical installation 13

3.2 Preparing the sensor for use 13

3.3 Mounting the sensor 13

4 DIMENSIONS 16

5

5. WIRING 17

6. GENERAL CALIBRATION & MAINTENANCE PROCEDURE 17

6.1 Calibration for pH measurement 17

6.2 Maintenance of the SC25F sensor 18

7. MODEL CODE 19

8. SPARE PARTS 19

9. EU DECLARATION OF CONFORMITY 20

10. CHEMICAL COMPATIBILITY CHART 22

IM 12B6J1-41E-E

6

1. PREFACE

1.1 Introduction

This instruction manual provides information
for the installation and use of the SC25F
SENCOM™ sensor. This digital sensor
shows how Yokogawa applies the motto
“Simply the Best” to sensor technology.
Setup of the sensor is very easy because
all sensor specific characteristics, such as
calibration data, are stored in the sensor.
The SC25F SENCOM™ sensor holds four
separate measuring elements:

• pH glass electrode.

• Long life saturated Ag/AgCl reference
system.

• Integral Pt1000 element for accurate
temperature measurements.

• Solid Titanium LE electrode for accurate
pH measurements.

Other valuable features of the sensor:

• PTFE reference diaphragm to prevent
fouling.

• Polymerized electrolyte to extend the
sensor lifetime.

• Available in different versions, a
G-glass version for general purpose
applications, and a L-glass version for
harsh applications and high process
temperatures. Both the G-glass as the
L-glass version are available in two
different lengths, 120 mm and 225 mm.

• Versatile in-line, immersion or off-line
installation.

from high voltages and currents which are
present on other cables.

1.2 Unpacking and Checking

Upon delivery, unpack the sensor carefully
and inspect it to ensure that it is not
damaged during shipment. If damage is
found, retain the original packing material
and immediately notify the carrier and the
relevant local Yokogawa Sales Office.
Make sure the Model Code and Serial
Number on the sensor are the same as on
the packing list. Also check if option(s) that
were ordered, are included and correct.

1.3 Warranty and Service

Yokogawa products are guaranteed free
from defects in workmanship and materials
under normal use and service for a period
of (typically) 12 months from the date of
shipment from the manufacturer. Individual
Sales organizations can deviate from the
typical warranty period, and the conditions
of sale 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 is excluded from this warranty
coverage. In the event of a warranty claim,
the defective goods should be sent (freight
paid) to the Service Department of the
relevant Yokogawa Sales office for repair or
replacement (at Yokogawa’s discretion).

Optional quick-removal adapters in both
stainless steel and titanium are available
to make calibration and maintenance even
easier.

The SC25F is provided with a multipole
M9 male connector for connection to the
Yokogawa FLXA analyzer using the WU11
interconnection cable for SENCOM™
sensors. This cable, available in 4 fixed
lengths, is specified for reliable transfer of
digital signals and especially designed to be
installed in a heavy industrial environment.
The double shielded cable will protect both
the sensor and the analyzer for interference

IM 12B6J1-41E-E

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.

• Clean Statement
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
sensor(options) have been exposed.

1.4 Serial Number definition

The Serial Number is defined by nine (9)
alphanumeric characters:
X1X2 Production Location
X3X4 Year/Month code
X5X6X7X8X9 Tracking number

Example: N1B600028

7

Table 1:

Production year according to
DIN. IEC 60062

Year Year code Year Year code

2010 A 2023 R
2011 B 2024 S
2012 C 2025 T
2013 D 2026 U
2014 E 2027 V
2015 F 2028 W
2016 H 2029 X
2017 J 2030 A
2018 K 2031 B
2019 L 2032 C
2020 M 2033 D
2021 N 2034 E
2022 P 2035 F

Table 2:

Production month code according to
DIN. IEC 60062

Month Month code

January 1
February 2
March 3
April 4
May 5
June 6
July 7
August 8
September 9
October O
November N
December D

IM 12B6J1-41E-E

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2. GENERAL SPECIFICATIONS

2.1 Measuring elements : pH glass electrode

: Silver Chloride reference
: Solid Titanium electrode
: Pt1000 temperature sensor

2.2 Wetted parts

Sensor body : Glass, PPS
Measuring sensor : G-glass or L-glass
Reference junction : Porous PTFE
Earth pin : Solid Titanium
O-ring : FKM (Viton)

2.3 Functional specifications (at 25°C)
Measuring system

Isothermal point : pH 7
Reference system : Ag/AgCl with saturated KCl
Glass impedance - G-glass : 400 MΩ nominal

- L-glass : 775 MΩ nominal
Liquid outlet : Non-flow junction
Junction resistance : < 10 kΩ
Temperature element : Pt1000 to IEC 751
Asymmetry potential(zero) : 8 ± 15 mV
Slope : > 96 % (of theoretical value)

Note: The SC25F temperature sensor is designed for cell compensation and for indication.

It is NOT designed for process temperature control.

2.4 Dynamic specifications

Startup time sensor : < 60 sec.
Response time pH : t90 < 15 sec. (for 7 to 4 pH step at 25 ºC)
Response time temperature : t90 < 1.5 min. (for 10 °C step)
Stabilization time pH : < 2 min. (for 0.02 pH unit during 10 sec.)

2.5 Operating range

pH* : 0 to 14
Temperature** - G-glass : -10 °C to 80 °C (14 °F to 176 °F)

- L-glass : +15 °C to 125 °C (59 °F to 257 °F)

Pressure (static) *** :

p(bar)

10

5

0

50 1000

Temp. (ºC)-10 25 130

Conductivity : > 10 µS/cm

Note* : The pH operating range is 0-14 pH, but using the sensor at temperature- and / or

pH-extremes will seriously shorten the lifetime.

Note** : The operating temperature for sensor in combination with PR10 retractable fitting

is limited to 80 ºC

Note*** : Process pressure fluctuations will shorten the lifetime of the sensor

IM 12B6J1-41E-E