1c
1b
8
Ø 12 mm
SE 555X/*-NMSN
SE 555X/*-NVPN
SE 555X/*-NS8N
Manual
Instructions for Use for the Series SE 555 pH Sensors
1
Sensor connectors
a - MS
b - VP
c - S8
2
19 mm A/F, serial number
3
PG 13.5 thread
4
PVDF compression ring
5
EPDM-FDA O-ring (11.5 x 2.6 mm)
6
Rating plate
7
Junction
8
pH glass
!
WARNING – Failure to observe this warn-
ing may result in serious injury.
The safety alert symbol on the nameplate
means:
Read these instructions for use, observe the Spec-
ifications, and follow the Safety Instructions.
1 Safety Instructions
1.1 All Applications – All Sensor Variants
Hazards due to pressure, temperature, aggres-
sive media or explosive atmosphere are possi-
ble, depending on the location of use. There-
fore, the installation, operation, and servicing of
the sensor shall only be carried out by suitably
trained personnel authorized by the operating
company.
1.2 Hazardous Areas – All Sensor Variants
Observe all applicable local codes and stan-
dards for the installation of electrical equipment
in hazardous locations. For orientation, please
refer to IEC 60079-14, EU directives 2014/34/EU
and 1999/92/EC (ATEX), NFPA 70 (NEC), ANSI/
ISA-RP12.06.01. The electrical and thermal pa-
rameters of the sensors must be adhered to.
1.3 Hazardous Areas – Sensors with Memosens
Connector
Memosens Ex sensors are marked by an orange-
red ring. Combined with a model CA/MS-***X**
or model CA/MS-***X**-L measuring cable or
a certified measuring cable which is identical
in hardware and function, the sensor may be
connected to a suitable measuring device, as
described in the Certificates BVS 15 ATEX E141 X
and IECEx BVS 15.0114X.
1.4 Hazardous Areas – Sensors with VP
Connector
The sensors shall only be operated with an
approved device in floating, intrinsically safe
circuits.
2 Intended Use
The sensor is used for continuous measurement of
pH in liquid media. The SE 555 is a low-maintenance
sensor with pressurized electrolyte. It has an integrat-
ed temperature detector for automatic temperature
compensation. The sensor is sterilizable by autoclav-
ing and is CIP/SIP capable.
The sensor is designed for applications in industrial
processes:
•
Hygienic processes
•
Biotechnology, food, pharma
•
High temperatures, high pH values, electroplating
3 Installation and Commissioning
•
On unpacking, check the sensor for mechanical
damage. Report any damage to your Knick service
team.
•
Take off the watering cap and use the included
knife to remove the silicone sealing from the junc-
tion. Briefly rinse the sensor with pure water. After
rinsing, the sensor should only be dabbed dry with
a tissue. Do not rub the pH-sensitive glass, since
this can lead to electrostatic charging and sluggish
response times.
•
Check the space behind the pH-sensitive glass for
the presence of any air bubbles and remove them
by gently shaking the sensor up and down.
•
Please refer to the user manual of the respective
fitting for instructions on how to install the sensor.
•
Connect sensor and cable.
4 Operation
4.1 Calibrating the Sensor
2-point pH calibration is recommended for the SE 555
sensor. First remove the watering cap. Then dip the
sensor successively into two different buffer solutions
with given pH values (e.g., CaliMat pH 7.00 and pH
4.00) and calibrate the sensor to these buffer values.
Please refer to the user manual of the pH transmitter
for further details.
4.2 Sterilizing
For application in sterile processes, such as fermenta-
tion, sterilize the sensor before starting the operating
cycle. Sterilization can be effected in situ by means of
steam or superheated process medium.
4.3 Temperature Detector
The integrated temperature detector is intended for
automatic compensation of the pH signal and not for
any high-precision and safe temperature indication
or control of the process temperature.
5 Maintenance and Cleaning
Carefully rinse the sensor tip and junction with pure
water after each operating cycle. Under no circum-
stances must measuring solution be allowed to dry
on these parts!
When the sensor is not in operation, store it with sen-
sor tip and junction well submerged in electrolyte
(3 mol/l KCl). If a sensor is stored dry for a few days
by mistake, let it soak in electrolyte for several hours
before use.
Contaminants can be removed as follows:
Protein:
Solution of pepsin / HCl
Lime:
Dilute acids
Silver sulfide:
Solution of thiourea / HCl
Grease:
Tenside solution / lye
6 Specifications
Model Code
The markings on each sensor or on the packaging
label include the following information:
SE 555X/ 1 - NMSN
Model designation
Sensor connector
MS: Memosens
VP: VarioPin
S8: coaxial
Length
1: 120 mm
2: 225 mm
3: 325 mm
4: 425 mm
Ex approval
X: Yes
Further Data
pH
0 ... 14
Temperature
0 ... 135 °C
Process pressure,
relative
-1 ... 6 bar
Pressure resistance
12 bar
Junction
1 x ceramic
Electrolyte
Viscous gel with internal
pressure
Reference system
Ag/AgCl
Sensor material
Omega glass
High impedance for
high-temperature applica-
tions, very low alkali error,
CIP/SIP capable
Body material
Glass
Mounting
PG 13.5
Temperature
detector
MS connector: NTC 30 kΩ
VP connector: Pt1000
S8 connector: without
7 Disposal
Observe the applicable local or national regulations
for disposal.
MEMO
SENS
5
4
3
6
120 / 225 / 325 / 425 mm
2
7
094678
TA-SE555X-NMSN-KNX01 20180625
Knick Elektronische Messgeräte GmbH
& Co. KG
Beuckestraße 22
14163 Berlin
Germany
Phone: +49 30 80191-0
Fax:
+49 30 80191-200
Email: [email protected]
Internet: www.knick-international.com
