6 Troubleshooting
If the measured value differs notably from the nom-
inal ORP value of the buffer during calibration or
if there is high and long-lasting drift, this is often
caused by contaminations. In most cases, these can
be removed by cleaning the platinum sensor surface,
e.g., using tooth paste or diluted hydrochloric acid.
Afterwards, rinse with pure water.
7 Specifications
Model Code
The markings on each sensor or on the packaging
label include the following information:
SE 564X/ 1 - NMSN
Model designation
Sensor connector
MS: Memosens
S8: DIN coax
Length
1: 120 mm
2: 225 mm
Ex approval
X: Yes
Further Data
ORP range
-1500 mV to +1500 mV
Operating temp
0 ... 130 °C
Pressure, relative
0 ... 10 bar
Junction
Hole (2x)
Electrolyte
Polymer electrolyte
Reference system
Ag/AgCl
Sensor material
Platinum
Mounting
PG 13.5
Temp detector
MS connector: NTC 30 kΩ
S8 connector: without
8 Disposal
Observe the applicable local or national regulations
for disposal.
1
Sensor connector:
a: Memosens®
b: DIN coax
2
Serial number
3
Orange-red ring
(Memosens Ex sensors only)
4
19 mm A/F
5
PG 13.5 thread
6
PVDF compression ring
7
EPDM-FDA O-ring (11.5 x 2.6 mm)
8
Rating plate
9
Junction (2x)
10
Platinum sensor surface
SE 564X/*-NMSN
SE 564X/*-NS8N
Manual
!
WARNING – Failure to observe this warn-
ing may result in serious injury.
The warning symbol on the rating plate
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 low-maintenance sensors of the SE 564 series
are designed for measuring ORP values in industrial
processes. Through two hole junctions, the reference
system with polymer electrolyte is in direct contact
with the measured medium. The standard reference
electrode potential is 207 mV (25 °C) against SHE
(standard hydrogen electrode). The sensor is made
of platinum.
3 Installation and Commissioning
•
On unpacking, check the sensor for mechanical
damage. Report any damage to your Knick service
team.
•
Remove the watering cap and briefly rinse the
sensor with pure water.
•
Install the sensor in the fitting as described in the
user manual of the respective fitting.
•
Connect sensor and cable.
4 Operation
4.1 Calibrating the Sensor
1-point calibration is recommended for the SE 564
sensor. First remove the watering cap. Then dip the
sensor into a redox buffer solution with given ORP val-
ue (e.g., 220 mV, pH 7) to calibrate the ORP transmitter
to this buffer value. Please refer to the user manual of
the transmitter for further details.
4.2 Temperature Detector
SE 564 sensors with Memosens connector are
equipped with a temperature detector.
Sensors with DIN coax connector have no tempera-
ture detector.
5 Maintenance and Cleaning
The polymer electrolyte is not refillable. Never keep or
store the sensor dry! You should store the sensor with
fitted watering cap containing electrolyte (3 mol/l
KCl). After each working cycle, be sure to clean the
platinum sensor surface (sensor tip) and the open
junctions thoroughly with pure water.
Instructions for Use for the Series SE 564 ORP Sensors
TA-SE564X_MSS8-KNX03 20161019
091747
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: knick-international.com
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