YOKOGAWA SC24V User manual

IM 12B06J07-02E-E
5th edition
Instruction
Manual
Model SC24V
Combined 12mm 4-in-1
differential pH sensor
YOKOGAWA
IM12B06J07-02E-E_ed05.indd 1 14/01/16 09:46

IM 12B06J07-02E-E
2
(BG)
Всички улътвания за продукти от серията
ATEX Ex ce лредлагат на английски език.
Ако се нуждаете oт улътвания за продукти
oт серията Ex на родния ви eзик, ce свържете
c най-близкия oфис или представителство на
фирма Yokogawa.
(CZ)
Všechny uživatelské příručky pro výrobky, na
něž se vztahuje nevýbušné schváleni ATEX Ex,
jsou dostupné v angličtině. Požadujete-li pokyny
týkající se výrobků s nevýbušným schválením ve
vašem lokálním jazyku, kontaktujte prosím vaši
nejbližší reprezentačni kancelář Yokogawa.
(D)
Alle Betriebsanleitungen für ATEX Ex bezogene
Produkte stehen in den Sprachen Englisch. Sollten
Sie die Betriebs- anleitungen für Ex-Produkte in
Ihrer Landessprache benötigen, setzen Sie sich
bitte mit Ihrem örtlichem Yokogawa-Vertreter in
Verbindung.
(DK)
Alle brugervejledninger for produkter relateret
til CE er tilgængelige på engelsk. Skulle De
ønske yderligere oplysninger om håndtering
af CE produkter på eget sprog, kan De rette
henvendelse herom til den nærmeste Yokogawa
afdeling eller forhandler.
(EST)
Kõik ATEX Ex toodete kasutamisjuhendid on
esitatud inglise keeles. Ex seadmete muukeelse
dokumentatsiooni saamiseks pöörduge lähima
lokagava (Yokogawa) kontori või esindaja poole
(E)
Todos los manuales de instrucciones para
los productos antiexplosivos de ATEX están
disponibles en inglés. Si desea solicitar las
instrucciones de estos artículos antiexplosivos en
su idioma local, deberá ponerse en contacto con
la oficina o el representante de Yokogawa más
cercano.
(F)
Tous les manuels d’instruction des produits
ATEX Ex sont disponibles en langue anglaise.
Si vous nécessitez des instructions relatives aux
produits Ex dans votre langue, veuillez bien
contacter votre représentant Yokogawa le plus
proche.
(GB)
All instruction manuals for ATEX Ex related
products are available in English. Should you
require Ex related instructions in your local
language, you are to contact your nearest
Yokogawa office or representative.
(GR)
Ολα τα εγχειριδια λειτουργιας των προιοντων
με ATEX Ex διατιθενται στα Αγγλικα. Σε
περιπτωση πον χρειαζεοτε οδηγιεξ σχετικα
με Ex στην τοπικη γλωσσα παρακαλονμε
επικοινωνηστε με το πλησιεστερο γραφειο τηζ
Yokogawa η αντιπροσωπο τηξ.
(H)
Az ATEX Ex mûszerek gépkönyveit angol
nyelven adjuk ki. Amennyiben helyi nyelven
kérik az Ex eszközök leírásait, kérjük keressék
fel a legközelebbi Yokogawa irodát, vagy
képviseletet.
(I)
Tutti i manuali operativi di prodotti ATEX
contrassegnati con Ex sono disponibili in inglese.
Se si desidera ricevere i manuali operativi di
prodotti Ex in lingua locale, mettersi in contatto
con l’ufficio Yokogawa più vicino o con un
rappresentante.
IM12B06J07-02E-E_ed05.indd 2 14/01/16 09:46

IM 12B06J07-02E-E
3
(LV)
Visas ATEX Ex kategorijas izstrâdâjumu
Lietoðanas instrukcijas tiek piegâdâtas
angïu valodâs. Ja vçlaties saòemt Ex ierîèu
dokumentâciju citâ valodâ, Jums ir jâsazinâs ar
firmas Jokogava (Yokogawa) tuvâko ofisu vai
pârstâvi.
(LT)
Visos gaminiø ATEX Ex kategorijos
Eksploatavimo instrukcijos teikiami anglø
kalbomis. Norëdami gauti priestaisø Ex
dokumentacijà kitomis kalbomis susisiekite su
artimiausiu bendrovës Yokogawa biuru arba
atstovu.
(M)
Il-manwali kollha ta’ l-istruzzjonijiet għal prodotti
marbuta ma’ ATEX Ex huma disponibbli bl-Ingliż.
Jekk tkun teħtieģ struzzjonijiet marbuta ma’ Ex
fil-lingwa lokali tiegħek, għandek tikkuntattja lill-
eqreb rappreżentan jew uffiććju ta’ Yokogawa.
(NL)
Alle handleidingen voor producten die te maken
hebben met ATEX explosiebeveiliging (Ex)
zijn verkrijgbaar in het Engels. Neem, indien u
aanwijzingen op het gebied van explosiebeveiliging
nodig hebt in uw eigen taal, contact op met de
dichtstbijzijnde vestiging van Yokogawa of met
een vertegenwoordiger.
(P)
Todos os manuals de instruções referentes aos
produtos Ex da ATEX estão disponíveis em
Inglês. Se necessitar de instruções na sua língua
relacionadas com produtos Ex, deverá entrar em
contacto com a delegação mais próxima ou com
um representante da Yokogawa.
(PL)
Wszystkie instrukcje obsługi dla urządzeń w
wykonaniu przeciwwybuchowym Ex, zgodnych
z wymaganiami ATEX, dostępne są w języku
angielskim. Jeżeli wymagana jest instrukcja obsługi
w Państwa lokalnym ję zyku, prosimy o kontakt z
najbliższym biurem Yokogawy.
(RO)
Toate manualele de instructiuni pentru produsele
ATEX Ex sunt in limba engleza. In cazul in care
doriti instructiunile in limba locala, trebuie sa
contactati cel mai apropiat birou sau reprezentant
Yokogawa.
(S)
Alla instruktionsböcker för ATEX Ex
(explosionssäkra) produkter är tillgängliga på
engelska. Om Ni behöver instruktioner för dessa
explosionssäkra produkter på annat språk, skall
Ni kontakta närmaste Yokogawakontor eller
representant.
(SF)
Kaikkien ATEX Ex-tyyppisten tuotteiden
käyttöhjeet ovat saatavilla englannin-. Mikäli
tarvitsette Ex-tyyppisten tuotteiden ohjeita
omalla paikallisella kielellännne, ottakaa yhteyttä
lähimpään Yokogawa-toimistoon tai -edustajaan.
(SK)
Všetky návody na obsluhu pre prístroje s ATEX
Ex sú k dispozícii v jazyku anglickom. V prípade
potreby návodu pre Ex-prístroje vo Vašom
národnom jazyku, skontaktujte prosím miestnu
kanceláriu firmy Yokogawa.
(SLO)
Vsi predpisi in navodila za AEX Ex sorodni
pridelki so pri roki v anglišèini. Èe so Ex sorodna
navodila potrebna v vašem tukejnjem jeziku,
kontaktirajte vaš najbliši Yokogawa office ili
predstaunika.
IM12B06J07-02E-E_ed05.indd 3 14/01/16 09:46

IM 12B06J07-02E-E
4
IM12B06J07-02E-E_ed05.indd 4 14/01/16 09:46

IM 12B06J07-02E-E
5
Table of 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 Regulatory standards 9
2.7 Shipping details 9
2.8 Environmental conditions 9
3 INSTALLATION OF SC24V 10
3.1 Typical installation 10
3.2 Preparing the sensor for use 10
3.3 Mounting the sensor 10
4 DIMENSIONS 13
5 WIRING 14
6 GENERAL CALIBRATION & MAINTENANCE PROCEDURE 15
6.1 Buffer calibration 15
6.2 Process calibration 15
6.3 Calibration of ORP and rH measurements 16
6.4 Maintenance of the SC24V sensor 16
7 MODEL CODE 17
8 SPARE PARTS 17
9 EU DECLARATION OF CONFORMITY 18
10 APPLICATION DATA SHEET SC24V DIFFERENTIAL PH SENSOR 19
IM12B06J07-02E-E_ed05.indd 5 14/01/16 09:46

IM 12B06J07-02E-E
6
1 PREFACE
1.1 Introduction
The SC24V sensor with Variopin connector is
not a conventional pH sensor, but a differential
sensor that uses two dissimilar ion sensitive
glass membranes to generate the pH signal.
The measuring element is the same as a
conventional pH electrode, and the reference
similar to a Sodium ion electrode. Therefore the
SC24V can only be used in combination with
pH analyzers that feature:
• Dual high impedance sensor inputs
• Adjustable setting for the Isothermal Point
• Adjustable temperature coefficient
The SC24V differential measuring principle
has significant advantages over conventional
electrode designs in a variety of difficult
applications. The hermetically sealed reference
eliminates exposure of the reference fill solution
to the process, as there is no reference junction
to be affected by aging, plugging or poisoning
from the process. This greatly reduces
maintenance problems since the reference
stability of the differential sensor is then only
dependant on the sodium concentration of the
process.
The SC24V is ideally suited for difficult
applications where conventional electrodes
suffer from reference problems, especially
when high temperatures and high pressures
are involved. 70-80% of industrial users will fully
benefit from using the SC24V, as they will have
sufficient sodium levels in their processes for a
stable measurement. Examples of applications
where the sensor has proven to be successful
are Chlorine manufacturing by electrolysis of
brine and Bio-ethanol fermentation.
The only applications where the SC24V cannot
be used are those where the salt concentration
is fluctuating more than 30% or is too low, such
as in pure and ultrapure water processes.
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.
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). 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 non-
warranty service is requested.
IM12B06J07-02E-E_ed05.indd 6 14/01/16 09:46

IM 12B06J07-02E-E
7
• 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:
X1X2Production Location
X3X4Year/Month code
X5X6X7X8X9Tracking number
Example: N3P600028
Method used for year/month numbering
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
IM12B06J07-02E-E_ed05.indd 7 14/01/16 09:46

IM 12B06J07-02E-E
8
2 GENERAL SPECIFICATIONS
2.1 Measuring elements : pH glass electrode
Sodium glass electrode
Solid Platinum electrode
Pt1000 temperature sensor
2.2 Wetted parts Measuring sensor : Glass
Earth pin : Solid Platinum
2.3 Functional specifications (at 25°C)
Isothermal point : pH 7, pNa 0
Reference system : pNa, salt sensitive reference glass
  Glassimpedance-pH :750MΩnominal
-pNa :750MΩnominal
Temperature element : Pt1000 to IEC 751
Asymmetry potential (zero): 0 ± 15 mV
Slope : > 90 % (of theoretical value)
Note: The SC24V temperature sensor is designed for cell compensation and for indication.
It is NOT designed for process temperature control.
2.4 Dynamic specifications
Response time pH : t90 < 15 sec. (for 7 to 4 pH step)
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 : 2 to 14 (refer to Table 3)
ORP : -1500 to 1500 mV
Temperature : 10 ºC to 120 °C (50 ºF to 248 °F)
Pressure : 0 to 10 bar (0 to 142 PSIG)
Conductivity : > 50 µS/cm
Table 3: pHoperatingrangeasfunctionoftheionicstrength(pH≥pNa+2)
pNa Ionic strength [mol ion+ per liter] pH operating range
0 1 2 to 14
1 0.1 3 to 14
2 0.01 4 to 14
3 0.001 5 to 14
4 0.0001 6 to 14
Note: The pH operating range is given at room temperature, but at high process temperatures
the lifetime of the sensor will be seriously shortened. For pH values > 12 the accuracy of
the pH measurement will change significantly by the alkali error.
IM12B06J07-02E-E_ed05.indd 8 14/01/16 09:47

IM 12B06J07-02E-E
9
2.6 Regulatory standards
CE : Decision 768/2008/EC
- ATEX : Directive 94/9/EC, as amended by Regulation (EC) no. 1882/2003
-Certificate no. : DEKRA 11ATEX0014 X
II 1 G Ex ia IIC T3...T6 Ga
-Electrical data : For sensor input circuits (by connector) connected to a certified
intrinsically safe circuit with the following maximum values
: Ui = 18V; Ii = 170 mA; Pi = 0.4 W; Li = 0 mH; Ci = 0 nF
(connector)
::or
: Certified intrinsically safe Yokogawa transmitter
Model FLXA21 series or Model PH202S series.
-Special
-conditions(X) :T6forTamb.-40°Cto+40°C
T4andT5forTamb.-40°Cto+55°C
T3forTamb.-40°Cto+105°C
: Electrostatic charges on the sensor enclosure and cable shall be
avoided.
: When the sensor has been connected to none intrinsically safe
equipment which exceeds the restrictions regarding the sensor
input circuit (see electrical data), the sensor is not suitable anymore
for intrinsically safe use.
- Pressure : Directive 97/23/EC, as amended by Regulation (EC) no. 1882/2003
-Applying article : 3.3 (Sound Engineering Practice)
: Damaging the screw thread of the sensor might influence the
maximum process pressure.
IECEx
Applying standards : IEC 60079-0: 2007
: IEC 60079-11: 2006
: IEC 60079-26: 2006
Certificate no. : IECEx DEK 11.0064X
2.7 Shipping details : 120 mm version 225 mm version
Package size (LxWxH) : 296 x 87 x 67 mm 435x 60 x 60 mm
(11.7 x 3.4 x 2.6 inch) (17.1x 2.4 x 2.4 inch)
Package weight : app. 0.25 kg (0.55 lbs) app. 0.25 kg (0.55 lbs)
2.8 Environmental conditions
Storage temperature : -10 ºC to 50 °C (14 ºF to 122 °F)
WARNING
WARNING
IM12B06J07-02E-E_ed05.indd 9 14/01/16 09:47

IM 12B06J07-02E-E
10
3 INSTALLATION OF SC24V
For optimum measurement results, the SC24V
should be installed in a location that offers
an acceptable representation of the process
composition and DOES NOT exceed the
specifications of the sensor.
The SC24V is designed with PG13.5 threaded
connection to allow installation in a wide variety
of applications.
3.1 Typical installation
The SC24V sensor is designed for versatile
in-line, immersion or off-line installation. For best
results the SC24V should be mounted with the
process flow coming towards the sensor, and
positioned at least 15° above the horizontal
plane to eliminate air bubbles in the pH glass
bulb (see Figure 1).
Figure 1: Mounting positions of sensor
3.2 Preparing the sensor for use
Remove the sensor from its shipping box and
slide off the so-called ‘wet pocket’, the tube
filled with solution to prevent drying out of the
measuring elements during shipment or storage.
During shipment, electrolyte in the sensor could
be dislocated. To correct this, place the sensor
upright for 24 hours. Before installing the sensor
in the process it should be calibrated. A general
calibration procedure is described in Section 6
of this Instruction Manual.
3.3 Mounting the sensor
The simplest mounting is to use the PG13.5
threaded connection of the sensor. The sensor
is standard with a slide ring (Ryton) and an
O-ring (Silicon) for direct mounting in a fitting
provided with PG13.5 thread (see Figure 2).
Other O-ring materials are available as a spare
part (see Section 8 of this Instruction Manual).
Figure 2: Simple mounting of sensor in PR10
retractable fitting
INCORRECT
15º15º
HORIZONTAL
GOOD GOOD
Slide ring
O-ring
SENSOR HOLDER
PG 13,5
IM12B06J07-02E-E_ed05.indd 10 14/01/16 09:47