Kobold SZM User manual

Operating Instructions
for
By-pass level indicator
Model: SZM

SZM
page 2 SZM K04/0522
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 ...................................................................................................... 6
9.Maintenance ................................................................................................. 7
10.Technical Information .................................................................................... 8
11.Order Codes ................................................................................................. 9
12.Dimensions ................................................................................................. 10
13.EU Declaration of Conformance ................................................................. 13
14.EU Declaration of Conformance (contact) ................................................... 14
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

SZM
SZM K04/0522 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.
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 model: SZM
 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.

SZM
page 4 SZM K04/0522
5. Operating Principle
The Kobold Unirota SZM model by-pass level indicator works on the basis of the
intercommunicating vessels principle. The SZM 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.

SZM
SZM K04/0522 page 5
7. Electrical Connection
7.1 Capacitive switch (option)
Wiring diagram
BN
BU
pnp BK

SZM
page 6 SZM K04/0522
8. Operation
Capacitive proximity switches are designed for non-contact and wear-free
detection of metal (electrically conductive) and nonmetal (electrically non-
conductive) objects.
Type: capacitive sensor
Operating voltage: 10 ... 65 VDC
Short-circuit protection: yes
Voltage drop: ≤1.8 V
Operating current: ≤200 mA
No-load current: ≤15 mA
Output function: 3-wire, N/O-contact, PNP
Connection type: 2 m PVC cable
Core cross section: 3 x 0.34 mm²
Fine adjustment: via potentiometer
Switching indication: LED, yellow
Protection: IP 67
Note: Customer cannot retrofit the contacts himself. If retrofitting of contacts is
desired, the SZM should be ordered with a remark “prepared for retrofitting of
limit contact”.
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.
load

SZM
SZM K04/0522 page 7
9. Maintenance
If the medium to be measured is clean, the series SZM is virtually maintenance-
free.
If deposits form is on the inner housing or parts, periodic cleaning of the unit is
recommended.
At case of SZM-x1…, SZM-x2…, SZM-x3…, SZM-x5…, SZM-x8 (with cleaning
hole):
 Drain the residual medium down from your appliance using the drain valve
(SZM-x5…), the cup of cleaning hole (SZM-x2…, SZM-x3…) or outlet screw
(SZM-x1…).
 If your appliance has shut-off valves, turn them off.
 Remove the units from the container with a suitable tool.
 Screw the cleaning hole out. It can be located at the bottom (SZM-x2…,
SZM-x3…) or top (SZM-x1…, SZM-x3…, SZM-x5…).
 Clean the by-pass level indicator with a suitable cleaning.
 Do the reassembly in reverse order.

SZM
page 8 SZM K04/0522
10. Technical Information
Installation position: vertical
Measuring length: 370 ... 3 080 mm
Material: stainless steel
Gasket: FPM (standard)
EPDM, NBR on request
Process connection: DIN flange DN 15 ... 50, ANSI flange ½" ... 2" or
union nut G ½", ½" NPT
Scale resolution: engraved, 1 cm, printed on foil, 2 mm
Max. pressure: 10 bar
Max. temperature: -20 °C…100 °C
Density: any (no float used)
Max. viscosity: 50 mm²/s
Protective category: IP 67
Material combinations
Ordering Code Measuring tube Connection Flange (not wetted part) Sealing
SZM-K glass 1.4301 1.4301 FPM
SZM-S glass 1.4404 1.4404 FPM

SZM
SZM K04/0522 page 9
11. Order Codes
Top and bottom end Valves Connection Scale Switches3)
SZM-K =
1.4301
SZM-S =
1.4404
Top: closed
0 = Bottom: drain plug
2 = Bottom: cleaning hole
4 = Bottom: drain valve
Top: cleaning hole
1 = Bottom: drain plug
3 = Bottom: cleaning hole
5 = Bottom: drain valve
Top: vent valve
7 = Bottom: drain plug
8 = Bottom: cleaning hole
6 = Bottom: drain valve
0 = without
1 = 2 x
shut-off
valves
G4 = union nut G ½ male
I4 = union nut G ½ female
N4 = union nut ½" NPT male
M4 = union nut ½" NPT female
F4 = loose flange DIN 2526,
C DN15; PN16
F5 = loose flange DIN 2526,
C DN20; PN16
F6 = loose flange DIN 2526,
C DN25; PN16
F7 = loose flange DIN 2526,
C DN32; PN16
F8 = loose flange DIN 2526,
C DN40; PN16
F9 = loose flange DIN 2526,
C DN50; PN16
A4 = loose flange ANSI
B 16.5 ½"; 150 lbs
A5 = loose flange ANSI
B 16.5 ¾"; 150 lbs
A6 = loose flange ANSI
B 16.5 1"; 150 lbs
A7 = loose flange ANSI
B 16.5 1 ¼"; 150 lbs
A8 = loose flange ANSI
B 16.5 1 ½"; 150 lbs
A9 = loose flange ANSI
B 16.5 2"; 150 lbs
B4 = loose flange ANSI
B 16.5 ½"; 300 lbs
B5 = loose flange ANSI
B 16.5 ¾"; 300 lbs
B6 = loose flange ANSI
B 16.5 1"; 300 lbs
B7 = loose flange ANSI
B 16.5 1 ¼"; 300 lbs
B8 = loose flange ANSI
B 16.5 1 ½"; 300 lbs
B9 = loose flange ANSI
B 16.5 2"; 300 lbs
00 = without
G11) = plastic foil on
measuring tube
(2 mm division)
G21) = engraved
measuring tube
(1 cm-division)
S12) = sidewise
Alu-scale (with
plastic-foil,
2 mm-division)
S22) = sidewise
engraved
Alu-scale
(1 cm-division)
00 = without
1D4) = 1 x N/O, PNP
2D4) = 2 x N/O, PNP
nD4) = n x N/O, PNP
1S5) = 1 x N/O, PNP
2S5) = 2 x N/O, PNP
nS5) = n x N/O, PNP
1) scale length = Installation length - 120 mm
2) scale length = Installation length - 100 mm
3)
Capacitive sensors
4)
Ideal for water, water-based solutions and solvent-based liquids.
5)
Ideal for oils, greases, lubricants, inks, acids, sauces, water-based alkalis and cleaning agents.
Note: Please specify the installation length "L" in clear text, while ordering.

SZM
page 10 SZM K04/0522
12. Dimensions
Vertical dimensions L
tot
[mm]
Bottom end
Top end
closed cleaning hole vent valve
drain plug L + 72 L + 95 L + 129
cleaning hole L + 93 L + 116 L + 150
drain valve L + 127 L + 150 L + 184
Horizontal dimensions Lho [mm]
With shut-of
f
valves Without shut-of
f
valves
Description Model code
Length (L
ho
)
Model code
Length (L
ho
)
Union-nut
SZM-x x 1 Gx
147
SZM-x x 0 Gx 84
SZM-x x 1 Nx SZM-xx0Nx
SZM-x x 1 Ix
153
SZM-x x 0 Ix 90
SZM-x x 1 Mx SZM-x x 0 Mx
Flange DIN SZM-x x 1 Fx 139 SZM-xx0Fx 76
Flange ANSI #150 SZM-x x 1 Ax 141 SZM-x x 0 Ax 78
Flange ANSI #300 SZM-x x 1 Bx 146 SZM-x x 0 Bx 83
Inspection length in all cases Lv = L - 100 mm
L = Total length
tot
L = Inspection length
v
L = Installation length
L = Horizontal length
ho
L = Valve leng th
valve
L = Total length
tot
L = Inspection length
v
L = Installation length
L = Horizontal length
ho
L = Total length
to t
L = Inspection length
v
L = Installation length
L = Horizontal length
ho