SE 503N-NVPN
Manual
Instructions for Use for the SE 503 Series pH Sensors
1
Sensor connector: VP
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, temp detector
!
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
Please take extra care during installation/fitting of
the sensor to ensure that neither the plastic body nor
the thread (PG 13.5) suffer any damage.
2 Intended Use
The Knick SE 503 is a low-maintenance pH sensor with
a sturdy plastic body and an integrated temperature
detector. It is provided with a gel electrolyte reference
system with 2 ceramic junctions.
The sensor is designed for simultaneous measure-
ment of pH and temperature in water and wastewater
processes. It can also be used at low temperatures.
3 Installation and Commissioning
•
On unpacking, check the sensor for mechanical
damage. Report any damage to your Knick service
team.
•
Remove the watering cap. 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 electrostat-
ic 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.
•
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
2-point pH calibration is recommended for the SE 503
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 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!
The electrolyte is not refillable. Never keep or store
the sensor dry! You should store the sensor with fitted
watering cap containing ZU 0960 electrolyte (3 mol/l
KCl).
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 503N/ 1 - NVPN
Model designation
Sensor connector
VP: VarioPin
Solution ground
N: Without
Length
1: 120 mm
Ex approval
N: Non-Ex
Further Data
pH range
0 ... 14
Temperature
-5 ... 80 °C
Pressure, relative
0 ... 2 bar
Junction
Ceramic (2x)
Electrolyte
Gel electrolyte
Reference system
Ag/AgCl
pH sensor material
Glass
Low impedance, low-
temperature applications
Body material
PSU (polysulfone)
Mounting
PG 13.5
Temp detector
Pt1000
7 Disposal
Observe the applicable local or national regulations
for disposal.
120 mm
7
1
6
3
4
5
Ø 12 mm
2
091053
TA-SE503N-NVPN-KNX01 20160606
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.de
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