Kobold NZJ User manual

Operating Instructions
for
By-pass level indicator
Model: NZJ

NZJ
page 2 NZJ K03/0522
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulation Use ............................................................................................. 3
5.Operating Principle ........................................................................................ 4
6.Mechanical Connection ................................................................................. 4
7.Electrical Connection .................................................................................... 5
7.1.Capacitive switch (option) .................................................................... 5
8.Operation ...................................................................................................... 5
9.Maintenance ................................................................................................. 6
10.Technical Information .................................................................................... 7
11.Order Codes ................................................................................................. 8
12.Dimensions ................................................................................................... 9
13.EU Declaration of Conformance ................................................................. 10
14.EU Declaration of Conformance (contact) ................................................... 11
Manufactured by: Sold by:
Kobold-Unirota Ltd. Kobold Messring GmbH
4400 Nyíregyháza Nordring 22-24
Derkovits út 132-136. D-65719 Hofheim
Tel.: [phone] Tel.: [phone]
Fax: [phone] Fax: [phone]
E-Mail: [email protected] E-Mail: [email protected]
Internet: www.unirota.hu Internet: www.kobold.com

NZJ
Model NZJ K03/0522 page 3
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 measuring unit should be used only when the
machines fulfil the EC-machine guidelines.
as per PED 2014/68/EU
In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the PED
2014/68/EU no CE mark.
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of the
delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
 By-pass level indicator: NZJ
 Capacitive switch (option)
4. Regulation Use
Any use of the device, which exceeds the manufacturer’s specification, may
invalidate its warranty. Therefore, any resulting damage is not the responsibility of
the manufacturer. The user assumes all risk for such usage.

NZJ
page 4 NZJ K03/0522
5. Operating Principle
The Kobold Unirota NZJ model by-pass level indicator works on the basis of the
intercommunicating vessels principle. The NZJ type glass tube level indicator is
applicable for the indication of liquid level in small and middle-sized, standing or
lying round containers used in food, pharmaceutical and chemical industries. The
level of the liquid in the glass tube of the appliance is the same with the level in
the round containers. The level of the liquid can be seen through the sight glass.
The loads occurring at the installation is absorbed by the fixing device, thus the
glass tube is protected against breaking. The fixing device also protects the
glass tube against the mechanical impacts that may occur following the
installation. We recommend that the normal design level indicators be fitted on
vessels containing pure liquids, while the indicators mounted with cleaning
stubs (a low, or low-top stub) be fitted on containers filled with contaminated
liquid.
6. Mechanical Connection
Before installation:
• Remove all transportation safety locks and ensure that no packing material
remains within the unit.
• Be sure that the maximum allowable operating pressure and temperature is
not exceeded (see Technical data).
• Install the by-pass level indicator at the side of the round containers, ensure
the instrument is under no mechanical stress/tension (install support bracing if
necessary).
• Protect the measuring tube from external damage.
• Avoid pressure peaks in the measuring tube, e.g. from sudden surges or
stoppage of flow.
• If possible, immediately after making mechanical connections, check whether
the connections are properly sealed with no evidence of leakage.
• Make sure that the connections are in plain.

NZJ
Model NZJ K03/0522 page 5
7. Electrical Connection
7.1. Capacitive switch (option)
8. Operation
Capacitive proximity switches are designed for non-contact and wear-free
detection of metal (electrically conductive) and nonmetal (electrically non-
conductive) objects.
Installing of the capacitive switch
 Slide the switch housing up until the glass tube is empty under the switch.
 Set the switching state LED off by adjusting the potentiometer located the end
of the switch.
 Slide the switch housing down until the glass tube is full under the switch.
 The LED must be on. If not, repeat the process from the first step util the LED
on.
Adjustment of limit-values
The switch-point can be adjusted to the desired levels by using the clamping screw
on the holder of switch.
Reference edge: approx. the middle of the sensor.
Slide the switch housing up or down until the reference edge coincides with the
desired switch- point scale reading.
BN
BU
pnp BK

NZJ
page 6 NZJ K03/0522
9. Maintenance
If the medium to be measured is clean, the series NZJ is virtually maintenance-
free.
If deposits form is on the inner housing or parts, periodic cleaning of the unit is
recommended.
 Remove the units from the container with a suitable tool.
 Screw the side flats out.
 Clean the glass tube with a suitable cleaning.
 Do the reassembly in reverse order.

NZJ
Model NZJ K03/0522 page 7
10. Technical Information
Installation position: vertical
Installation length: 100…540 mm
Measuring length: 60…500 mm
Material: stainless steel (1.4301/1.4404) / Alu
Gasket: NBR, FPM, EPDM, PTFE
Process connection: G ¼, ¼” NPT (male) union nut
Scale resolution: 2 mm on stick foil
Max. pressure: 16 bar
Ambient temperature: -25...+70 °C
Medium temperature: 0 °C...+100 °C (0° C...+70 °C with switch)
Density: any (no float used)
Max. viscosity: 50 mm²/s
Limit contacts
Type: capacitive sensor (without ATEX)
Operating Voltage UB: 10...65 VDC
Short-circuit protection: pulsing Voltage drop UD: ≤ 1.8 V
Operating current IL: ≤ 200 mA
No-load supply current I0: ≤ 15 mA
Output function: 3-wire, N/O-contact, PNP Connection type: Ø
5.2 mm, LifYY, PVC, 2 m Core cross-section: 3 x 0.34 mm2
Fine adjustment: via potentiometer
Switching indication: LED, yellow
Protection: IP67
Material combinations
Code Tube Body Connection Seal
NZJ-A
borosilicate
glass
aluminum
1.4404
NBR
NZJ-K stainless steel 1.4301 FPM
NZJ-S stainless steel 1.4404 FPM

NZJ
page 8 NZJ K03/0522
11. Order Codes
Model Version Seals Connection Switch Option
NZJ-A
NZJ-K
NZJ-S
0 = without scale
1 = with scale in mm
2 = with scale in %*
1 = FPM
3 = EPDM
4 = NBR
5 = PTFE
G2 = G” ¼
N2 = ¼ NPT
00 = without
1D
1)
= 1x N/O
2D
1)
= 2x N/O
1S
2)
= 1x N/O
2S
2)
= 2x N/O
0 = without
Y = customer
specification
*Please specify the 0% and 100% level relative to the bottom and top connection level in clear text.
1) Ideal for water, water-based solutions and solvent-based liquids.
2) Ideal for oils, greases, lubricants, inks, acids, sauces, water-based alkalis and cleaning agents.

NZJ
Model NZJ K03/0522 page 9
12. Dimensions
30
L+ 20
L
29
77
L‐ 58
max.
min.
L‐
4
0
NZJ‐12110

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page 10 NZJ K03/0522
13. EU Declaration of Conformance
We, KOBOLD Unirota Kft. Nyíregyháza Hungary, declare under our sole
responsibility that the product:
By-pass level indicator Model: NZJ-…
to which this declaration relates is in conformity with the standards noted below:
EN IEC 63000:2018 Technical documentation for the assessment of electrical
and electronic products with respect to the restriction of hazardous substances
Also, the following EC guidelines are fulfilled:
2011/65/EU RoHS (category 9)
2015/863/EU Delegated Directive (RoHS III)
Nyíregyháza, 10 May 2022
Dénes Szabó
General Manager