Kobold URM User manual

Operating Instructions
for
Variable area flow meter
Model: URM

URM
page 2 URM K05/0522
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Inductive 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

URM
URM K05/0522 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:
 Variable area flow meter model: URM
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.

URM
page 4 URM K05/0522
5. Operating Principle
The Kobold URM model flowmeter/monitor works on the basis of the suspended float
principle. It is used for measuring the flow rates in closed pipe line systems.
The medium flows from below through a glass measuring cone that gets wider on
top. Thus, the float is raised and indicates the respective flow rate on the scale
provided on the measuring cone. To monitor flow rate limits, the URM meters can be
optionally furnished with “open collector“ proximity switches.
By its special design, this model is particularly suitable for applications where
only very small operating pressures are available. Another advantage is
offered by the very large sight glass which optically allows direct flow
observation.
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 flow meter in the piping system, 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

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URM K05/0522 page 5
7. Electrical Connection
7.1 Inductive switch (option)
• Make sure that the supply wires are de-energized.
• housing.
8. Operation
In order to initialise the inductive switch function, it is essential that the float
activates the contact once in each direction.
Adjustment of limit-values
The switch-point can be adjusted to the desired levels by using.
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.
Overranging
With non-pulsating flow, the maximum flow rate can be exceeded. Only an increase
in pressure loss will result (max. permissible operating pressure must not be
exceeded!)

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page 6 URM K05/0522
9. Maintenance
If the medium to be measured is clean, the series URM is virtually maintenance-
free. If deposits form on the inner housing or parts, periodic cleaning of the unit is
recommended. Remove the units from the piping with a suitable tool; clean the flow
meter with a suitable cleaning agent or make use of an ultrasonic bath.

URM
URM K05/0522 page 7
10. Technical Information
Installation position: vertical
Accuracy class: 4 acc. to VDI
Max. temperature: 100°C (65°C for PVC)
Max. pressure: 01H (L)…37H (L) 16 bar
43H…57H 12 bar
43L…55L 10 bar
63H…65H 8 bar
63L…65L 6 bar
Calibration conditions: water: 20°C, air: 20°C,
air pressure: 1.013 bar abs.
Ambient temperature: -25…+70°C
Protective category: IP 67
Contact (optional): proximity switch: PNP
open collector, n/o contact
supply voltage: 10…30 VDC
current consumption: ≤ 200 mA
cable: 2 m, PVC-insulated
switching state: LED, yellow
Material combinations
Ordering
code Connection Float Seal Ring
Measuring
cone Housing
33 1.4301 1.4301 NBR PVC
borosilicate
glass st.st. 1.4301
55 1.4404 1.4404 FPM PTFE
99** 1.4301
1.4404
1.4301
1.4404
aluminium
PTFE
PVC
PP
NBR
EPDM
FPM
PTFE
PVC
PTFE
1.4301
** Customer specification on request

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page 8 URM K05/0522
11. Order Codes
Model
Material
combi-
nation
Instru-
ment
length
Measuring range Pressure
loss
[mbar]
Thread connection
3)
Contacts
1)
water [l/h] air [Nm
3
/h]
female male
URM-
33
55
992)
210 mm
01H = 0.25…2.5 01L = 0.0032…0.032
6
I2
I3
= G ¼
= G 3⁄8
G2
G3
= G ¼
= G 3⁄8
00
= no
contact
03H = 0.4…4 03L = 0.008…0.08 6
05H = 0.63…6.3 05L = 0.02…0.2 8
07H = 1…10 07L = 0.032…0.32 10
09H = 1.6…16 09L = 0.05…0.5 10
360 mm
11L = 0.02…0.2 10
I2
I3
= G ¼
= G 3⁄8
G2
G3
G4
= G ¼
= G 3⁄8
= G ½
13H = 1…10 13L = 0.032…0.32 10
15H = 1.6…16 15L = 0.05…0.5 10
17H = 2.5…25 17L = 0.08…0.8 12
19H = 4.0…40 19L = 0.13…1.3 12
360 mm
22H = 6.3…63 22L = 0.2…2.0 17
I3
I4
= G 3⁄8
= G ½
G3
G4
G5
= G 3⁄8
= G ½
= G ¾
00 = none
1A = 1x N/O,
PNP
2A = 2x N/O,
PNP
24H = 10…100 24L = 0.32…3.2 24
26H = 16…160 26L = 0.5…5.0 28
28H = 25…250 28L = 0.8…8.0 25
360 mm
33H = 40…400 33L = 1.3…13 36
I4
I5
= G ½
= G ¾
G4
G5
G6
= G ½
= G ¾
= G 1 00 = none
1B = 1x N/O,
PNP
2B = 2x N/O,
PNP
35H = 63…630 35L = 2.0…20 34
37H = 100…1000 37L = 3.2…32 43
440 mm
43H = 100…1000 43L = 3.2…32 43 I5
I6
I7
= G ¾
= G 1
= G 1 ¼
G5
G6
G7
G8
= G ¾
= G 1
= G 1 ¼
= G 1 ½
45H = 160…1600 45L = 5.0…50 48
47H = 250…2500 47L = 8.0…80 51
440 mm
3H = 400…4000 53L = 13…130 51 I6
I7
I8
I9
= G 1
= G 1 ¼
= G 1 ½
= G 2
G6
G7
G8
G9
= G 1
= G 1 ¼
= G 1 ½
= G 2 00 = none
1C = 1x N/O,
PNP
2C = 2x N/O,
PNP
55H = 630…6300 55L = 20…200 57
57H = 1000…10 000 70
600 mm
63H = 1600…16 000 63L = 32…320 93 I8 = G 1 ½
I9 = G 2
IA = G 2 ½
IB = G 3
G8 = G 1 ½
G9 = G 2
GA = G 2 ½
GB = G 3
65H = 2500…25 000 102
on YYY = others on request
request
*Other switching functions on request
**Customer specification on request

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URM K05/0522 page 9
12. Dimensions
URM with female/male thread (F = female / M = male)
Model
H
[mm]
A
[mm]
¼"
3
⁄ 8 " ½" ¾" 1" 1 ¼" 1 ½" 2" 2 ½" 3"
URM-xx 0... 210 29,5 F/M F/M - -
- - - - - -
URM-xx 1...
360
F/M F/M -/M -
- - - - - -
URM-xx 2... 40,0 - F/M F/M -/M
- - - - - -
URM-xx 3... 49,5 - - F/M F/M -/M
- - - - -
URM-xx 4... 440 62,0 - - - F/M F/M F/M -/M
- - -
URM-xx 5... 82,0 - - - - F/M F/M F/M F/M
- -
URM-xx 6... 600 122,0 - - - -
- - F/M F/M F/M F/M
Connection
Centering ring
Protection tube
Measuring tube
Seals
Float
H
G
ØA

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page 10 URM K05/0522
13. EU Declaration of Conformance
We, KOBOLD Unirota Kft. Nyíregyháza Hungary, declare under our sole
responsibility that the product:
Variable area flow meter Model: URM-…
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