Kobold OMS User manual

Operating Instructions
for
Screw-Type Volumetric Flow Meter
Model: OMS

OMS
page 2 OMS K01/0922
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.General Information ...................................................................................... 4
5.Regulation Use ............................................................................................. 4
6.Warranty ....................................................................................................... 4
7.Operating Principle ........................................................................................ 5
8.Mechanical Connection ................................................................................. 6
9.Electrical Connection .................................................................................... 7
10.Disassembly and Assembly .......................................................................... 9
10.1Servicing .............................................................................................. 9
11.Start up ....................................................................................................... 16
12.Troubleshooting .......................................................................................... 17
13.Maintenance ............................................................................................... 18
14.Technical Information .................................................................................. 19
15.Order Details ............................................................................................... 21
16.Dimensions and Weights ............................................................................ 22
17.Pressure loss diagram ................................................................................ 24
18.Disposal ...................................................................................................... 25
19.Appendix ..................................................................................................... 26
19.1Tightening torque for screws with metric screw threads and head
contact surfaces ................................................................................. 26
19.2Tightening torques for screw plugs with thread measured in inches
and elastomer seal ............................................................................ 26
19.3Tightening torques and widths for threaded rings .............................. 27
20.EU Declaration of conformance .................................................................. 28
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

OMS
OMS K01/0922 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.
Diagram 8, Pipe, Group 1 dangerous fluids
3. Instrument Inspection
All 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:
 Screw-Type Volumetric Flow Meter, model: OMS-...

OMS
page 4 OMS K01/0922
4. General Information
 lt is important that all staff concerned with the unit read the operation and
maintenance manual prior to start up of the unit.
 The user is responsible for taking the precautions outlined in this manual
 This screw-volumeter should not be operated outside of the data given on the
type plate. Any differences require confirmation from us.
 It is not possible to put all the information you may require in the manual.
Should you require any special information, please contact us.
 Depending on the operating conditions, wear, corrosion or age of the unit, its
specified attributes may be limited. It is therefore essential that the unit is
periodically maintained. The user must replace all parts which would not
guarantee a long operating life or trouble-free operation. If the unit operates
unusually or if damage is observed, further operation must be discontinued
 Installations which could lead to personal injury and/or material failure should
be equipped with an alarm system and/or bypass. This system should be
checked periodically.
5. Regulation Use
Any use of the Helical Volume-meter, model: OMK-..., which exceeds the
manufacturer’s specifications, may invalidate its warranty. Therefore, any
resulting damage is not the responsibility of the manufacturer. The user assumes
all risk for such usage.
6. Warranty
The warranty is according to our terms of delivery. Repairs during the guarantee
period must be carried out only by user or any other person authorised by us and
in accordance with our agreement and instructions.

OMS
OMS K01/0922 page 5
7. Operating Principle
The measuring principle of the KOBOLD screw-
volumeter is positive displacement.
The flow of the fluid to be measured causes the
measuring spindles M to rotate. With each
rotation an exact volume is given. These
rotations are being transmitted to the display A
by the pole wheel P and pick up I.
There the volume can be shown in any unit of
measurement.

OMS
page 6 OMS K01/0922
8. Mechanical Connection
Mountin
g
position: an
y
Flow direction: both directions are possible, preferable flow D according the
identification plate.
Minimum pressure:
The meter back pressure at the outlet fitting should be kept
higher than 0,1 bar (1.5 PSIG). In no case may the medium
freely run out of the flow meter. If necessary, install a valve
at the meter outlet to generate the appropriate back
pressure.
Unclean medium: Filtration with max. 0,3 mm (30 Micron) mesh width is
required.
Foreign substance: The pipe system must be free from welding slag, cuttings,
as the
y
can block and dama
g
e the flow meter.
Over pressure
valve:
A blocked flow meter stops the complete flow of the
medium, therefore, depending on the application, a
pressure relief valve is required.
Fastening: Must be installed with piping fully supported at the inlet and
outlet and properly aligned to prevent stresses on the flow
meter pipe thread connection.
Pipe thread con-
nection:
Storage:
The thread length of the pipe should not be longer than the
thread length of the flowmeter (Stricture of the flow-
diameter, damaging of internal parts).
Improper storage may cause corrosion and seizing of
internal parts.

OMS
OMS K01/0922 page 7
9. Electrical Connection
The screw-type volumeters are set up, tested and delivered with an integrated dry
sleeve.
The purchaser must screw the pulse generator cartridge into the dry shell using
the knurled nut and spring.
Caution! The dry shell must not contain any foreign matter. The
spring must be able to push the pulse generator cartridge fully into
the front side of the dry shell.
The free cable ends are connected to a display unit. When connecting, please
comply with the terminal diagram and technical data. Further technical data can
be found in the additional operating instructions "Pulse generator of the OM
series".
Caution! The sensor system (sensor, measuring transducer and
wires) must not be located in the vicinity of powerful
electromagnetic field pulses, such as those emanating from
overhead power lines, electric motors, frequency converters etc.
That could lead to incorrect measurements or even cause serious
damage to the sensor system.

OMS
page 8 OMS K01/0922
Mounting and dismounting
The sensors consist of a sensor cartridge E that is screwed into the relevant dry
shell G using the knurled ring R and spring.
During operation, the sensor insert E can also be changed when the system is
under pressure and without fluid leaking out.
The dry shell G was built in, screwed in and tested as a unit with the sensor
cartridge E at the KOBOLD factory. The dry shell G must not be moved out of
position because that might cause the sensor signal to be lost or the volumeter to
be damaged or functionally impaired.
OM.../44
Caution: If the dry shell G is out of position, this is indicated by
the red sealing point. If the sealing point is damaged, then no
warranty for the volumeter can be assumed.

OMS
OMS K01/0922 page 9
10. Disassembly and Assembly
This work is only to be carried out by trained personnel. The manual is only
intended as an aid for performing the work.
If the spindle set or the measurement housing is replaced, the volumeter must be
recalibrated!
10.1 Servicing
Dangers during servicicng
The following safety instructions must be observed strictly:
 Have all work only carried out by authorized qualified personnel.
 To ensure the measuring precision, the measuring unit may only be replaced
by the manufacturer.
 Before beginning work, let the flowmeter cool down slowly to the ambient
temperature. Avoid rapid temperature changes
 Pumped liquids can be hot, poisonous, combustible and caustic.
 Observe the tightening torques, see Appendix, chapter 19.
 Observe the operating instructions and data sheets of the sensors.
10.1.1 Removing seals and bearings OMS-20/OMS-25
Personal qualification: 
Fitter
Personal protective
equipment
 Work clothing
 Protective gloves
 Safety boots
Aids: 
Extractor
Requirement:
 Flowmeter removed from system
 Completion consisting of socket screws, flanges and seals removed
 Pick up inserts removed
 Remove the socket screws 915.1 and 915.2, take off the end covers 070.1
and 070.2
 Remove the O-rings 739.1, 739.2 and 739.5** (1 x per pick up hole).

OMS
page 10 OMS K01/0922
 Pull the distance sleeve 039 together with the screw set out of the
measuring housing 128.
 Remove the circlips 869.2 and 869.4 from the measuring screw large
672.1 and measuring screw small 672.2.
 Screw out the socket screws 915.6 and 915.7 and remove the wedge lock
washers 904.1, 904.2 and supporting rings 064.1*** (only OMS-032)
064.2.
 Screw the socket screw 915.6 completely back in, in order to pull the pole
wheel 259 and distance ring 056 from the measuring screw large 672.1 by
using an extractor. Remove the socket screw 915.6 again.
 Pull the ball bearings 817.1, 817.2, 817.3 and 817.4 from the measuring
screws by using the ex- tractor.
10.1.2 Installing seals and bearings OMS-20/OMS-25
Personal qualification: 
Fitter
Personal protective equipment:  Work clothing
 Protective gloves
 Safety boots

OMS
OMS K01/0922 page 11
 Insert the O-rings 739.1 and 739.2 into the end covers 070.1 and 070.2
 Insert the O-ring 739.5** into the pick up hole (1 per pick up hole)
 Press on the ball bearings 817.1 and 817.2 only over the inner rings on the
measuring screw large 672.1.
 Press on the ball bearings 817.3 and 817.4 only over the inner rings on the
measuring screw small 672.2
 Slide the distance ring 056 on the measuring screw large 672.1, press on the
pole wheel 259.
 Pull the wedge lock washers 904.1 and 904.2 and supporting rings 064.1***
(only OMS-032) and 064.2 onto the socket screws 915.6 and 915.7.

Apply Loctite 242 to the socket screws 915.6 and 915.7 , install on the
measuring screw large and measuring screw small with mounted washers
and tighten with torque, see Appendix, chapter 19
 Install the circlips 869.2 and 869.4 respectively on the floating bearing end.
 At a BSPP connection: Place the end cover 070.2 on the measuring housing,
lay ready the socket screws 915.2.
-or-
At a flange connection: Place the end cover 070.2 and flange cover 115.2* with
O-ring 739.4* on the measuring housing, lay ready the socket screws 915.4*.
 Pretension the oiled screws crosswise and tighten with torque.
10.1.3 Removing seals and bearings OMS-40
Personal qualification: 
Fitter
Personal protective equipmenr:  Work clothing
 Protective gloves

Safet
y
boots
Aids: 
Extractor
Requirement:
 Flowmeter removed from system
 Completion consisting of socket screws, flanges and seals removed

OMS
page 12 OMS K01/0922
 Pick up inserts removed
 Remove the socket screws 915.1 and 915.2, take off the bearing cover
080.2. Remove the O- ring 739.2
 Drive the screw set together with the bearing cover 080.1 out of the
measuring housing 128 using light blows of a plastic hammer and pull out.
 Screw out the socket screw 915.6 with wedge lock washer 904.1 and
supporting ring 064.1 at the measuring screw large 672.1. Pull off the pole
wheel 259 and distance ring 056.

OMS
OMS K01/0922 page 13
 Screw out the socket screw 915.7 with wedge lock washer 904.2 and
supporting ring 064.2 at the measuring screw small 672.2.
 Pull out the screw set from the bearing cover 080.1 with extractor.
 Screw the threaded rings 057.1 and 057.2 out of the bearing cover. Widths of
the threaded rings, see Appendix, Page 19.
 Remove the O-rings 739.1 and 739.5** (1 x per pick up hole).
 Take out the distance ring 054 and pull the ball bearings 817.3 and 817.4 out
of the bearing cover using an extractor.
 Remove the circlips 869.2 and 869.4 and the support rings 868.2 and 868.4
from the measuring screws.
 Pull the ball bearings 817.1 and 817.2 from the measuring screws by using
the extractor.
10.1.4 Installing seals and bearings OMS-40
Personal qualification: 
Fitter
Personal protective equipment:  Work clothing
 Protective gloves
 Safety boots
Requirements:
 Replacement parts available

OMS
page 14 OMS K01/0922
 Insert the O-rings 739.1 and 739.2 into the bearing covers 080.1 and 080.2.
 Insert the O-ring 739.5** into the pick up hole (1 x per pick up hole).
 Press in the ball bearings 817.3 and 817.4 only over the outer rings in the
bearing cover 080.1.
 Press the distance ring 054 onto the ball bearings 817.3.
 Press the ball bearings 817.1 on only over the inner ring on the measuring
screw large 672.1
 Press the ball bearings 817.2 on only over the inner ring on the measuring
screw small 672.2.
 First screw in the threaded ring 057.2, then the threaded ring 057.1 into
the bearing cover 080.1 using a torque wrench. For the widths and
tightening torques, see Appendix, chapter 19.

OMS
OMS K01/0922 page 15
 Press the measuring screws into the ball bearings in the bearing cover.
Support the respective inner ring in the process
 Pull the wedge lock washers 904.2 and supporting rings 064.2 onto the
socket screw 915.7. Ensure a tight connection of the wedge lock washers.

Apply Loctite 242 to the socket screws 915.7 , install on the measuring
screw small with mounted washers and tighten with torque, see
Appendix, chapter 19.
 Slide the distance ring 056 on the measuring screw large 672.1. Press on
the pole wheel 259.
 Pull the wedge lock washer 904.1 and supporting ring 064.1 onto the
socket screw 915.6. Ensure a tight connection of the wedge lock washers.
 Apply Loctite 242 to the socket screw 915.6 , install on the measuring
screw large
672.1 with mounted washers and tighten with torque, see
Appendix, chapter 19.
 Install the support rings 868.2 and 868.4 and the circlips 869.2 and
869.4 on the floating bearing end.
 Place the bearing cover 080.2 onto the measuring housing 128 and tighten
the socket screws 915.2 with torque.
 Slide the bearing cover 080.1 with bearings and premounted measuring
unit, consisting of screw
set and pole wheel, into the measuring housing,
tighten the socket screws 915.1 with torque, see Appendix, chapter 19.

Install the flange cover. In the process pre-tighten the oiled screws
crosswise and tighten with
torque, see Appendix, chapter 19.

OMS
page 16 OMS K01/0922
11. Start up
Technical data on the identification plate must be considered.
Venting: The system must be free of air (affects the accuracy)

OMS
OMS K01/0922 page 17
12. Troubleshooting
Problem Cause Solution
Too great a loss
of pressure
 Viscosity of medium and/or flow
rate too high
 Increase the temperature
(complying with the permissible
temperature range)
 Reduce the flow rate

Use larger volumeters
Leakage  Sealing not sufficiently pre-
stressed
 Sealing defective
 Pre-stress the screws
 Replace the sealing

Check the chemical stability
Blocked
volumeter
 Foreign matter
 Pulse generator screwed in too
far
 Supply pressure too low
 Clean the volumeter
 Incorporate a filter (see Section
8)
 Set the pulse generator

Increase the supply pressure
Measurement
errors too great
 Entrapped air
 Escaped gas
 Pulsation too high
 Back-pressure too weak
 Type of operation
- Major fluctuations in circulation
- Filling quantities too small
- Significantly deviating operating
- data
 Significant wear and tear
 Errors in the area of the pulse
generator / electronic hardware
 Ventilate
 Increase system pressure,
reduce temperature
 Change the feed pump
Change made to the system
 See minimum pressure (see
Section 8)
 Change the operating
conditions
 Upgrade the volumeter
 Filter out abrasive substances
 See pulse generator manual /
electronic hardware manual
No signal  Pulse generator cartridge is
defective
 Defective connection
 Screw volumeter is not running
 Incorrect power supply
 Unscrew the pulse generator
cartridge and check if the pulse
generator cartridge is functioning
properly, it must transmit a pulse in
the vicinity of a ferromagnetic
component (see light-emitting diode)
 Check light-emitting diode
 Start operating the screw
volumeter
 Compensate the electronic
hardware
No clear signal  Pulse generator cartridge is
defective
 Poor contacts
 Interference sources from outside
 Magnet wheel's separation
distance not correct
 Replace pulse generator
cartridge
 Check the connection
 Make sure the cable (measuring
transducer) is laid correctly
 Check the signal with an
oscilloscope. Correct the spacing

OMS
page 18 OMS K01/0922
13. Maintenance
KOBOLD-volumeters are free of maintenance. At high bearing load it is useful to
change the rolling bearings after a certain service life.
When high accuracy is required, it is further advisable to calibrate the device peri-
odically.

OMS
OMS K01/0922 page 19
14. Technical Information
Material
Housing: standard: st. st. (material no. 1.4301)
option: st. st. (material no. 1.4435)
Spindles: st. steel
O-rings: FKM
Bearings: stainless steel ball bearings for low viscosities,
ceramic sliding bearing for high viscosities
Thread for sensor: M 18 x 1
with O-ring in the case
Measuring accuracy: ±0.3 % of span 1:100
Viscosity range: 1-5000 mm2/s
Flange: st. st. (material no. 1.4435, sealing face form C,
according to DIN 2526)
Pole wheel: st. steel
Operating temperature: -20 …+150°C
(Please note limitation due to pulse
generator)
Application: lubricating and non-lubricating liquids
Accuracy Diagram
The measuring error refers to the actual flow rate. The diagram shows the
characteristic for the OMS-... screw-type volumetric flow meter.
A test certificate is available because every device delivered is different.

OMS
page 20 OMS K01/0922
OM.../44
Technical Details Pulse Generator
Model System Voltage tmax p
max
face
Material dry
sleeve
Electrical
connection
Protection
44 Hall-effect
PNP 10...30 VDC -40..+150°C 420 bar Arcap 3 m PTFE cable IP 67