Kobold KET User manual

Operating Instructions
for
Compact Inline Thermal Sensor
Model: KET

KET
page 2 KET K01/0323
We don’t accept warranty and liability claims neither upon this publication nor in
case of improper treatment of the described products.
The document may contain technical inaccuracies and typographical errors. The
content will be revised on a regular basis. These changes will be implemented in
later versions. The described products can be improved and changed at any time
without prior notice.
© Copyright
All rights reserved.
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 4
3.Instrument Inspection .................................................................................... 4
4.Regulation Use ............................................................................................. 5
5.Safety instructions ......................................................................................... 6
6.Operating Principle ........................................................................................ 7
7.Scaling Analogue output Compressed Air ................................................. 8
8.Installation Description ................................................................................... 9
8.1Installation of KET ............................................................................... 9
8.2Display head position ........................................................................... 9
9.Flow measuring ranges ............................................................................... 10
9.1Flow for different gases ...................................................................... 10
10.Electrical wiring ........................................................................................... 11
10.1Modbus, 4…20 mA ............................................................................ 11
11.Operation .................................................................................................... 12
11.1Initialization ........................................................................................ 13
11.2Main menu ......................................................................................... 13
11.3Settings .............................................................................................. 14
12.Status / Error messages .............................................................................. 29
12.1Status messages ............................................................................... 29
12.2Error messages ................................................................................. 29
13.Maintenance ............................................................................................... 30
14.Cleaning of the sensor head ........................................................................ 31
15.Re-Calibration ............................................................................................. 31
16.Spare parts and repair ................................................................................. 31
17.Calibration ................................................................................................... 31
18.Technical Information .................................................................................. 32
19.Order Codes ............................................................................................... 32
20.Dimensions ................................................................................................. 32
21.Disposal ...................................................................................................... 33
22.EU Declaration of Conformance ................................................................. 34
23.UK Declaration of Conformity ...................................................................... 35

KET
KET K01/0323 page 3
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

KET
page 4 KET K01/0323
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.
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
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 machinery directive.
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:
 Compact Inline Thermal Sensor Model: KET

KET
KET K01/0323 page 5
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.
The KET consumption sensor is used for continuous flow measurements.
The KET consumption sensor is designed and constructed exclusively for the intended
purpose described here and may only be used accordingly.
The user must check whether the instrument is suitable for the selected application. It must
be ensured that the medium is compatible with the wetted parts. The technical data listed
in the data sheet are binding.
Improper handling or operation outside the technical specifications is not permitted. Claims
of any kind based on improper use are excluded.
Operating principle:
The KET consumption probe operates according to the calorimetric measuring method.
The basis of this measuring method is the electrical heating of the mechanically protected
built-in sensor. The mass flow, the volume flow and the flow velocity can be measured and
determined by the resulting heat flow to the passing medium (gas).
With the calorimetric measurement method (based on the measurement principle), the
operating temperature and pressure of the medium have no influence on the measurement
result, only the material data of the gas component are decisive.

KET
page 6 KET K01/0323
5. Safety instructions
Please read carefully before starting the device!
Warning: Do not exceed the pressure range of 16 bar! Observe the measuring
range of the sensor!
Always observe the direction of flow when positioning the sensor! The screwed
fixture must be pressure tight.
It is absolutely necessary to avoid condensation on the sensor element or water
drops in the measuring air as they may cause faulty measuring results.
The manufacturer cannot be held liable for any damage which occurs as a result of
non- observance or non-compliance with these instructions. Should the device be
tampered with in any manner other than a procedure which is described and
specified in the manual, the warranty is cancelled and the manufacturer is exempt
from liability.
The device is destined exclusively for the described application.
We offer no guarantee for the suitability for any other purpose and are not liable for
errors which may have slipped into this operation manual. We are also not liable
for consequential damage resulting from the delivery, capability or use of this
device.
We offer you to take back the instruments of the instruments family KET which you
would like to dispose of.
Qualified employees from the measurement and control technology branch should
only carry out adjustments and calibrations.
The consumption sensor KET works according to the calorimetric measuring
procedure.
Flammable gases
If this consumption sensor is used for measurement of flammable gases (e. g.
natural gas and so on) we expressly would like to point out that the sensor has no
DVGW admission, however, it can be used for measurements in natural gas. A
DVGW admission is not mandatory.
The consumption sensor corresponds with the current state of technology and
basically it can be used in any flammable and non-flammable gases.
If the sensor is used e.g. in the medium natural gas, the sensor will be adjusted for
natural gas. The calibration protocol (inspection certificate) will be included in the
scope of delivery.
The area outside the pipeline (ambient area of the sensor) must not be an explosive
area.
The installation has to be carried out by authorized professionals.

KET
KET K01/0323 page 7
6. Operating Principle
The newly developed KET combines modern digital interfaces for connection to
energy monitoring systems with a small, compact design. The KET is always used
when many machines (compressed air consumers) are to be integrated into an
energy monitoring network.
Readout values in the display can be rotated by 180°, e.g. for overhead installation.
Display shows 2 values at the same time:
 Present flow in m³/h, l/min, ...
 Total consumption (counter reading) in m³, l, kg
 Temperature measurement

KET
page 8 KET K01/0323
7. Scaling Analogue output Compressed Air
Reference DIN1945/ ISO 1217: 20°C, 1000 mbar (Reference during calibration)
Description Version Analogue output
KET with integrated ½” measuring block
Low Speed
4… 20 mA =
0...20 m³/h
Standard 0...45 m³/h
Max 0...90 m³/h
High Speed 0...110 m³/h
KET with integrated ¾” measuring block
Low Speed
4… 20 mA =
0...45 m³/h
Standard 0...85 m³/h
Max 0...175 m³/h
High Speed 0...215 m³/h
KET with integrated 1" measuring block
Low Speed
4… 20 mA =
0...75 m³/h
Standard 0...145 m³/h
Max 0...290 m³/h
High Speed 0...355 m³/h
KET with integrated 1¼” measuring
block
Low Speed
4… 20 mA =
0...140 m³/h
Standard 0...265 m³/h
Max 0...530 m³/h
High Speed 0...640 m³/h
KET with integrated 1½” measuring
block
Low Speed
4… 20 mA =
0...195 m³/h
Standard 0...365 m³/h
Max 0...730 m³/h
High Speed 0...885 m³/h
KET with integrated 2" measuring block
Low Speed
4… 20 mA =
0...320 m³/h
Standard 0...600 m³/h
Max 0…1195m³/h
High Speed 0...1450 m³/h

KET
KET K01/0323 page 9
8. Installation Description
8.1 Installation of KET
The sensor KET is pre-supplied with the measuring block.
 An installation at customer site is only allowed in the unpressurized state
of the system.
 Tightness of the connection must be checked and ensured
 The connecting nut is tightened to a torque of 25 -30 Nm.
 It has to be checked whether the KET is correctly installed in the measuring
section, the flow direction arrows must point from the integrated flow
straightener
away.
8.2 Display head position
The Position of the Display head is twistable by
180 e.g., in case of reverse flow direction.
For this purpose, the 6 fastening screws are to
be released and the display head rotated 180°.
Caution:
It must be ensured that the connection plugs are
still plugged and the gasket is installed correctly.

KET
page 10 KET K01/0323
9. Flow measuring ranges
9.1 Flow for different gases
Please note:
The area outside the pipeline (ambient area of the sensor) must not be an explosive
area.