Kobold NE-104 User manual

Operating Instructions
for
Electrode Relays for
Conductive Level Switches
Model: NE
(without WHG-certification)

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1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulation Use ............................................................................................. 4
5.Operating Principle ........................................................................................ 4
6.Mechanical Connection ................................................................................. 5
7.Electrical Connection .................................................................................... 5
7.1.Electrode relay NE-104 ........................................................................ 5
7.2.Electrode relay NE-304 ........................................................................ 6
8.Commissioning............................................................................................ 10
9.Locating and Remedying Faults .................................................................. 11
10.Maintenance ............................................................................................... 11
11.Technical Information .................................................................................. 12
12.Order Codes ............................................................................................... 12
13.Dimensions ................................................................................................. 13
14.Disposal ...................................................................................................... 14
15.EU Declaration of Conformance ................................................................. 15
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com

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2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The instruction manuals on our website www.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that corresponds to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
The devices are only to be used, maintained and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.
When used in machines, the NE-unit should be used only when the machines
fulfil the EC-machine guidelines.
3. Instrument Inspection
The instruments are inspected before shipping and sent out in perfect condition.
Should damage to the instrument be visible, we recommend close inspection of
the delivery package. In cases of damage, please immediately inform the
forwarder as he is liable for any damage in transit.
Scope of delivery
 Conductive Electrode Relay model: NE

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4. Regulation Use
The Conductive Limit Switch has been designed for use in level monitoring
applications and for pump control for low to highly conductive liquids. The switch
has no moving parts—thus, it is particularly suited for monitoring critical media
with low solid contents, low density, or high viscosity.
It comprises conductive electrodes and an electrode relay.
The medium conductivity must be min. 20S/cm.
Electrode relay
The model NE-104 or NE-304 electrode relay controls the conductive electrodes
and switches throughput, when the conductivity changes.
Model 104: For one switching point with one electrode and one earth electrode.
The relay can be operated in interval mode with two electrodes and one earth
electrode.
Model 304: For two switching points, two interval mode operations or for one
switching point and one operation in interval mode.
The electrode relay is connected to the electrodes via cable.
Electrodes
Two types of conductive probes are available: solid rod or flexible pendant
electrodes; they are vertically mounted in the tank to be monitored. The electrode
length corresponds to the switching point.
5. Operating Principle
KOBOLD electrode relays of type NE- are used with conductive level switches
NES, NEH and LNK for level monitoring and control of conductive liquids.
An electrode relay NE-104 is required for single point signalling.
It additionally includes one bistable interval relay with lock and is therefore
suitable for pump control (Min./Max. control).
With relay NE-304 and a level conductive switch with two signal and one ground
electrodes, two level limits could be detected. The relay outputs can both be
operated as a Min./Max. control or separately as a limit switch (alarm) and a
min./max. control.

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6. Mechanical Connection
The electrodes can be screwed into the tank cover via a pipe thread and sealed,
for example. The electrode length corresponds to the desired switching points,
and rod electrode lengths may be shortened. The electrode tip must be free of
insulating materials. The electrodes must be installed so that the electrode rods
or the pendant electrodes are not short-circuited with the side of the tank, or with
each other. Please ensure that the rods cannot buckle, or that the pendant
electrodes cannot become knotted.
The reference or earth electrode must be at least as long as the longest switching
electrode. If the side of the tank is adequately conductive and is not coated with
insulating material, it can be used as an earth electrode. The clearance between
the switching electrode and the side of the tank should be as small as possible,
so that the conductivity of the measuring distance does not fall below 20S/cm.
7. Electrical Connection
Attention! Make sure that the voltage values of your system
correspond with the voltage values of the measuring unit. Make sure
that the supply wires are de-energised.
Maximum cable length: 300 m, minimum cross-section 0,5 mm². A
screened, low capacity cable is to be used at a cable length of approx. 15
m and near EMC-critical installation environement. The cable needs to be
connected to an adequate shield ground.
7.1. Electrode relay NE-104
The NE-104 electrode relay is the standard relay for all
conductive limit electrodes. It is supplied as a break
relay, i.e., the relay picks up (contact 6-7 closes) when
auxiliary power is applied. If the electrodes are wetted or
the power fails, the relay disengages (contact 7-8
closes). The signal lamp (red LED) is energised when
the relay picks up.

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Electrode connection
Usage as Min/Max switch (2 electrodes)
 Connect the earth or reference electrode to terminal 14.
 Connect the switching electrode to terminal 15.
Level Relay LED
Below the switching electrode relay picks up, contact 6-7 closed on
Reaches or above the switching electrode relay drops out, contact 7-8 closed out
Use for interval control (3 electrodes)
 Connect the earth or reference electrode to terminal 14.
 Connect the MAX-switching electrode to terminal 15 and the MIN-switching
electrode to terminal 16.
 Contact 6-7 is closed when the tank is empty. When the liquid reaches the
MAX electrode, the relay changes over and contact 7-8 closes. The relay
remains changed over until the level falls below the MIN electrode. The interval
then repeats itself.
 The changeover contact may be used for evacuating or filling—as shown in
the circuit examples.
Terminating the mains voltage
 The mains voltage is terminated at terminals 1 and 2, and the protective earth
conductor at terminal 3 (PE).
Note: Terminal 14 (earth) is internally linked to terminal 3 (PE).
7.2. Electrode relay NE-304
The NE-304 electrode relay is a double relay with two
separated electrode circuits and one reference electrode. It
is supplied as a break relay, i.e., the relay picks up (contact
3-4 and 6-7 closes) when auxiliary power is applied. If the
electrodes are wetted or the power fails, the relay
disengages (contact 4-5 and 7-8 closes). The signal lamps
(red LED’s) are energised when the relay picks up.

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Electrode connection
Usage as MIN/MAX switch (3 electrodes)
 Connect the earth or reference electrode to terminal 10.
 Connect MIN.-switching electrode to terminal 12 and the MAX.-switching
electrode to terminal 15.
Level Relay LED
Min.-Electrode Reaches or above the switching electrode relay drops out, contact 4-5 closed out
Below the switching electrode relay picks up, contact 3-4 closed on
Max.-Electrode Reaches or above the switching electrode relay drops out, contact 7-8 closed out
Below the switching electrode relay picks up, contact 6-7 closed on
Use for two interval controls (5 electrodes)
 Connect the earth or reference electrode to terminal 10.
 Pump 1: Connect the MAX-switching electrode to terminal 12 and the MIN-
switching electrode to terminal 13. Contact 3-4 is closed when the tank is
empty (LED 1-on). When the liquid reaches the MAX electrode, the relay
changes over and contact 4-5 closes (LED 1-out). The relay remains changed
over until the level falls below the MIN electrode. The interval then repeats
itself.
 Pump 2: Connect the MAX-switching electrode to terminal 15 and the MIN-
switching electrode to terminal 16. Contact 6-7 is closed when the tank is
empty (LED 2-on). When the liquid reaches the MAX electrode, the relay
changes over and contact 7-8 closes (LED 2-out). The relay remains changed
over until the level falls below the MIN electrode. The interval then repeats
itself.
 The changeover contact may be used for evacuating or filling—as shown in
the circuit examples.
Use for one interval controls and one switch point (4 electrodes)
 Connect the earth or reference electrode to terminal 10.
 Pump 1: Connect the MAX-switching electrode to terminal 12 and the MIN-
switching electrode to terminal 13.
 Connect the switch point switching electrode to terminal 15.

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Terminating the mains voltage
 The mains voltage is terminated at terminals 1 and 2, and the protective earth
conductor at terminal 9 (PE).
Note: Terminal 10 (earth) is internally linked to terminal 9 (PE).
Connection Diagrams – examples of use model NE-104
P
M
Power supply
Power
supply
Empty container

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P
M
Power supply
Power
supply
Power supply
Power
supply
Overflow protection
Fill container

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8. Commissioning
Turn the sensitivity potentiometer fully clockwise to the right, until the stop is
reached. When the main voltage has been connected, and the electrodes have
been connected according to their required function, the conductive limit switch is
ready for operation. The tank may now be filled. The sensitivity is optimally
adjusted with this basic setting. Should foaming cause the relay to operate too
early, the sensitivity can be reduced by turning the sensitivity potentiometer to the
left, until the foam does not cause the relay to operate.
Power supply
Power
supply
Minimum level
protection

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9. Locating and Remedying Faults
The relay does not operate:
 Check that the main voltage is applied to terminals 1 and 2. If the voltage is
present, the red LED should light up and the relay should pick up. If there is no
reaction, the relay is faulty.
 If the LED is energised
Relay model NE-104: Disconnect the electrode from terminals 14, 15, and 16,
and short-circuit terminals 14 and 15 with a wire jumper. The relay must drop
out now. If there is no reaction, the relay is faulty.
Relay model NE-304: Disconnect the electrode from terminals 10, 12, 13, 15,
and 16, and short-circuit terminals 10, 12 and 10, 15 with a wire jumper. The
relay must drop out now. If there is no reaction, the relay is faulty.
 If the relay switches, remove the short-circuiting link and connect the
electrodes according to the connecting instructions. Short-circuit the electrodes
at the tips with a wire jumper. If the relay does not change over now, there is a
cable interruption, or the electrode tips are insulated by deposits.
 If the relay with the wire jumper at the electrode tips changes over, remove the
wire jumper, adjust the maximum sensitivity on the relay, and immerse the
electrodes in the medium. If the relay still does not switch, the conductivity of
the medium may be too low.
10. Maintenance
The conductive limit switch requires absolutely no maintenance. The electrode
tips should be occasionally inspected for deposits or corrosion, and should be
cleaned. Insulating deposits can cause a malfunction.

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11. Technical Information
NE-104, NE-304
Power supply: 230, 110, 224 VAC ± 15%;
50 - 60 Hz
Power input: NE-104: approx. 2 VA
NE-304: approx. 4 VA
Floating voltage: approx. 10 VA
Short-circuit-current: approx. 0.5 mA
Sensitivity: adjustable 0 - 50 kOhm
Response time: approx. 1 s
Output: NE-104: 1 floating changeover contact
NE-304: floating changeover contacts
Switching capacity: max. 250 VAC, 5 A, 600 VA
Housing: Macrolone
Protection: Housing: IP 40
Terminals: IP 20
Ambient temperature: -20 °C...+60 °C
Dimensions: 75 x 55 x 110 mm
Installation: DIN rail mount or
screw fixation
Signalling: LED red: monitoring state
12. Order Codes
Order Details (Example: NE-104 0)
Model Description Number of outputs Power
supply
NE- Electrode relay
104 = 1 limit signal or
1 min/max controller
304 = 2 limit signals or
2 min/max controlle
r
0 = 230 VAC
1 = 110 VAC
2 = 24 VAC

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13. Dimensions

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14. Disposal
Note!
 Avoid environmental damage caused by media-contaminated parts
 Dispose of the device and packaging in an environmentally friendly
manner
 Comply with applicable national and international disposal regulations
and environmental regulations.
Batteries
Batteries containing pollutants are marked with a sign consisting of a crossed-out
garbage can and the chemical symbol (Cd, Hg, Li or Pb) of the heavy metal that
is decisive for the classification as containing pollutants:
Cd1 Hg2 Pb3 Li4
1. „Cd" stands for cadmium
2. „Hg" stands for mercury
3. „Pb" stands for lead
4. „Li" stands for lithium
Electrical and electronic equipment

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15. EU Declaration of Conformance
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Electrode Relays for Conductive Level Switches Model: NE-104, NE-304
to which this declaration relates is in conformity with the standards noted below:
EN 61326-1:2013
Electrical equipment for measurement, control and laboratory use - EMC
requirements - Part 1: General requirements
EN 61010-1:2011
Safety requirements for electrical equipment for measurement, control and
laboratory use - Part 1: General requirements
Also the following EEC guidelines are fulfilled:
2014/30/EU EMC Directive
2014/35/EU Low Voltage Directive
2011/65/EU RoHS (category 9)
Hofheim, 27. Apr. 2016
H. Peters M. Wenzel
General Manager Proxy Holder