Reinhausen MESSKO MTO Series User manual

Oil Level Indicator
MESSKO® MTO
Operating Instructions
5972470/01 EN

© All rights reserved by Messko GmbH
Dissemination and reproduction of this document and use and disclosure of its
content are strictly prohibited unless expressly permitted.
Infringements will result in liability for compensation. All rights reserved in the event
of the granting of patents, utility models or designs.
The product may have been altered since this document was published.
We reserve the right to change the technical data, design and scope of supply.
Generally the information provided and agreements made when processing the
individual quotations and orders are binding.
The original operating instructions were written in German.

Table of contents
35972470/01 EN
1 Introduction...........................................................................6
1.1 Manufacturer.................................................................................... 6
1.2 Completeness.................................................................................. 6
1.3 Safekeeping..................................................................................... 6
1.4 Notation conventions ....................................................................... 6
1.4.1 Hazard communication system .................................................................... 7
1.4.2 Information system....................................................................................... 8
1.4.3 Instruction system ........................................................................................ 8
1.4.4 Typographic conventions ............................................................................. 9
2 Safety...................................................................................10
2.1 Intended use .................................................................................. 10
2.2 Fundamental Safety Instructions ................................................... 10
2.3 Personnel qualification................................................................... 12
2.4 Personal protective equipment ...................................................... 14
3 Product description............................................................16
3.1 Scope of delivery ........................................................................... 16
3.2 Function description....................................................................... 16
3.3 Design............................................................................................ 18
3.4 Versions......................................................................................... 20
3.4.1 Radial float movement ............................................................................... 21
3.4.2 Axial float movement.................................................................................. 22
3.5 Safety markings ............................................................................. 23
3.6 Nameplate ..................................................................................... 23
4 Packaging, transport and storage ....................................24
4.1 Purpose ......................................................................................... 24
4.2 Suitability, structure and production............................................... 24
4.3 Markings ........................................................................................ 24

Table of contents
4 5972470/01 EN
4.4 Transportation, receipt and handling of shipments........................ 24
4.5 Storage of shipments..................................................................... 26
4.6 Further transport ............................................................................ 26
5 Mounting .............................................................................27
5.1 Preparation .................................................................................... 28
5.1.1 Electromagnetic compatibility..................................................................... 28
5.1.2 Safeguarding the power circuits................................................................. 30
5.1.3 Cable recommendation .............................................................................. 30
5.1.4 Checking the flanges.................................................................................. 31
5.1.5 Gasket requirements.................................................................................. 33
5.2 Preparing the connecting flange on the oil conservator................. 33
5.2.1 Standard flange.......................................................................................... 34
5.2.2 RM flange (MTO-ST160RM) ...................................................................... 35
5.2.3 NAT/DS flange (MTO-ST160RM) .............................................................. 37
5.3 Mounting the MTO on the oil conservator...................................... 39
5.3.1 Mounting an MTO with radial float rod ....................................................... 39
5.3.2 Mounting an MTO with axial float rod......................................................... 45
5.3.3 Mounting the MTO on an inclined flange ................................................... 50
5.4 Electrical connection...................................................................... 51
5.4.1 Preparing the cables .................................................................................. 52
5.4.2 Connecting MTO with cable screw connection / NPT cable screw
connection.................................................................................................. 52
5.4.3 Connecting the MTO with connector.......................................................... 59
5.4.4 MTO with TT30 (optional) .......................................................................... 60
6 Commissioning...................................................................61
6.1 Transporting in the installed state.................................................. 61
6.2 Function tests ................................................................................ 61
7 Maintenance, inspection and care ....................................63

Table of contents
55972470/01 EN
8 Disposal...............................................................................64
9 Technical data.....................................................................65
9.1 Ambient conditions ........................................................................ 65
9.2 Electrical connection...................................................................... 65
9.2.1 Micro-switches ........................................................................................... 65
9.2.2 Connection options .................................................................................... 68
9.3 Dimensions and weight.................................................................. 72
9.3.1 Dimensions (radial float movement)........................................................... 72
9.3.2 Dimensions (axial float movement) ............................................................ 72
9.3.3 Float gauge ................................................................................................ 72
10 Appendices .........................................................................80
10.1 6372954_000................................................................................. 81
10.2 6373168_000................................................................................. 82
10.3 6373523_000................................................................................. 83
10.4 6371560_000................................................................................. 84
10.5 7036358_000................................................................................. 85
10.6 7036293_000................................................................................. 86
10.7 6771687_000................................................................................. 87
10.8 6771692_000................................................................................. 88
10.9 6771696_000................................................................................. 89

1 Introduction
6 5972470/01 EN
This technical document contains detailed descriptions on the safe and
proper installation, connection, commissioning and monitoring of the prod-
uct.
This technical document is intended solely for specially trained and autho-
rized personnel.
1.1 Manufacturer
The product is manufactured by:
Messko GmbH
Gewerbegebiet An den Drei Hasen
Messko-Platz 1
61440 Oberursel
Germany
Phone: [phone]
E-mail: [email protected]
Internet: www.reinhausen.com/messko
Further information on the product and copies of this technical document are
available from this address if required.
1.2 Completeness
This technical file is incomplete without the supporting documents.
The following documents apply to this product:
▪ Operating instructions
▪ Works certification
1.3 Safekeeping
Keep this technical file and all supporting documents ready at hand and ac-
cessible for future use at all times.
1.4 Notation conventions
This section contains an overview of the symbols and textual emphasis
used.

1 Introduction
75972470/01 EN
1.4.1 Hazard communication system
Warnings in this technical file are displayed as follows.
1.4.1.1 Warning relating to section
Warnings relating to sections refer to entire chapters or sections, sub-sec-
tions or several paragraphs within this technical document. Warnings relat-
ing to sections have the following format:
WARNING
Type of danger!
Source of the danger and its consequences.
► Action
► Action
1.4.1.2 Embedded warning information
Embedded warnings refer to a particular part within a section. These warn-
ings apply to smaller units of information than the warnings relating to sec-
tions. Embedded warnings use the following format:
DANGER! Instruction for avoiding a dangerous situation.
1.4.1.3 Signal words and pictograms
The following signal words are used:
Signal word Definition
DANGER Indicates a hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING Indicates a hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION Indicates a hazardous situation which, if not avoided, could result
in minor or moderate injury.
NOTICE Indicates measures to be taken to prevent damage to property.
Table1: Signal words in warning notices

1 Introduction
8 5972470/01 EN
Pictograms warn of dangers:
Pictogram Definition
Warning of a danger point
Warning of dangerous electrical voltage
Warning of combustible substances
Warning of a tipping hazard
Warning of a hot surface
Table2: Pictograms used in warning notices
1.4.2 Information system
Information is designed to simplify and improve understanding of particular
procedures. In this technical file it is laid out as follows:
Important information.
1.4.3 Instruction system
This technical file contains single-step and multi-step instructions.

1 Introduction
95972470/01 EN
Single-step instructions
Instructions which consist of only a single process step are structured as fol-
lows:
Aim of action
üRequirements (optional).
► Step 1 of 1.
ðResult of step (optional).
ðResult of action (optional).
Multi-step instructions
Instructions which consist of several process steps are structured as follows:
Aim of action
üRequirements (optional).
1. Step 1.
ðResult of step (optional).
2. Step 2.
ðResult of step (optional).
ðResult of action (optional).
1.4.4 Typographic conventions
The following typographic conventions are used in this technical file:
Typographic convention Purpose Example
UPPERCASE Operating controls,
switches
ON/OFF
[Brackets] PC keyboard [Ctrl] + [Alt]
Bold Software operating con-
trols
Press Continue button
…>…>… Menu paths Parameter > Control pa-
rameter
Italics System messages, error
messages, signals
Function monitoring alarm
triggered
[► Number of pages]. Cross reference [► 41].
Table3: Typographic conventions

2 Safety
10 5972470/01 EN
This technical document contains detailed descriptions on the safe and
proper installation, connection, commissioning and monitoring of the prod-
uct.
▪ Read this technical file through carefully to familiarize yourself with the
product.
▪ This technical file is a part of the product.
▪ Read and observe the safety instructions provided in this chapter in partic-
ular.
▪ Observe the warnings in this technical file in order to avoid function-re-
lated dangers.
▪ The product is manufactured on the basis of state-of-the-art technology.
Nevertheless, risks to life and limb for the user or impairment of the prod-
uct and other material assets may arise in the event of improper use.
2.1 Intended use
The oil level indicator displays the oil level of the transformer's oil conserva-
tor. The product is designed solely for use in stationary, industrial, large-
scale electrical energy systems and facilities. If used as intended and in
compliance with the requirements and conditions specified in this technical
document as well as the warning notices contained in this technical docu-
ment and attached to the product, the product does not pose risk of personal
injury or damage to property or the environment. This applies throughout the
entire service life of the product, from delivery, installation and operation to
removal and disposal.
Intended use refers to the following:
▪ Use the product only with the transformer specified in the order.
▪ Operate the product in accordance with this technical document, the
agreed-upon delivery conditions and the technical data.
▪ Ensure that any necessary work is only performed by qualified personnel.
▪ Use the equipment and special tools supplied solely for the intended pur-
pose and in accordance with the specifications of this technical file.
2.2 Fundamental Safety Instructions
To prevent accidents, disruptions and damage as well as unacceptable ad-
verse effects on the environment, those responsible for transport, installa-
tion, operation, maintenance and disposal of the product or parts of the prod-
uct must ensure the following:

2 Safety
115972470/01 EN
Personal protective equipment
Loosely worn or unsuitable clothing increases the danger of becoming
trapped or caught up in rotating parts and the danger of getting caught on
protruding parts. This results in danger to life and limb.
▪ All necessary devices and personal protective equipment required for the
specific task, such as a hard hat, safety footwear, etc. must be worn. Ob-
serve the "Personal protective equipment" [►Section 2.4, Page 14] sec-
tion.
▪ Never wear damaged personal protective equipment.
▪ Never wear rings, necklaces or other jewelry.
▪ If you have long hair, wear a hairnet.
Work area
Untidy and poorly lit work areas can lead to accidents.
▪ Keep the work area clean and tidy.
▪ Make sure that the work area is well lit.
▪ Observe the applicable laws for accident prevention in the relevant coun-
try.
Contamination level
Moisture, dust, sweat and other conductive dirt may cause malfunctions in
the device. To ensure contamination levelII, observe the following informa-
tion:
▪ Wear assembly gloves.
▪ Ensure that no dirt or moisture enters the device when it is open.
▪ Seal the device after installation.
Explosion protection
Highly flammable or explosive gases, vapors and dusts can cause serious
explosions and fire.
▪ Do not install or operate the product in areas where a risk of explosion is
present.

2 Safety
12 5972470/01 EN
Safety markings
Warning signs and safety information plates are safety markings on the
product. They are an important aspect of the safety concept. Safety mark-
ings are depicted and described in the chapter "Product description".
▪ Observe all safety markings on the product.
▪ Make sure all safety markings on the product remain intact and legible.
▪ Replace safety markings that are damaged or missing.
Ambient conditions
To ensure reliable and safe operation, the product must only be operated
under the ambient conditions specified in the technical data.
▪ Observe the specified operating conditions and requirements for the in-
stallation location.
Modifications and conversions
Unauthorized or inappropriate changes to the product may lead to personal
injury, material damage and operational faults.
▪ Only modify the product after consultation with Messko GmbH.
Spare parts
Spare parts not approved by Messko GmbH may cause physical injury and
damage the product.
▪ Only use spare parts approved by the manufacturer.
▪ Contact Messko GmbH.
Working during operation
You must only operate the product when it is in a sound operational condi-
tion. Otherwise it poses a danger to life and limb.
▪ Regularly check the operational reliability of safety equipment.
▪ Perform the inspection tasks described in this technical document regu-
larly.
2.3 Personnel qualification
The person responsible for assembly, commissioning, operation and inspec-
tion must ensure that personnel are sufficiently qualified.

2 Safety
135972470/01 EN
Electrically skilled person
The electrically skilled person has a technical qualification and therefore has
the required knowledge and experience, and is also conversant with the ap-
plicable standards and regulations. The electrically skilled person is also pro-
ficient in the following:
▪ Can identify potential dangers independently and is able to avoid them.
▪ Is able to perform work on electrical systems.
▪ Is specially trained for the working environment in which (s)he works.
▪ Must satisfy the requirements of the applicable statutory regulations for
accident prevention.
Electrically trained persons
An electrically trained person receives instruction and guidance from an
electrically skilled person in relation to the tasks undertaken and the poten-
tial dangers in the event of inappropriate handling as well as the protective
devices and safety measures. The electrically trained person works exclu-
sively under the guidance and supervision of an electrically skilled person.
Operator
The operator uses and operates the product in line with this technical docu-
ment. The operating company provides the operator with instruction and
training on the specific tasks and the associated potential dangers arising
from improper handling.
Technical Service
We strongly recommend having repairs and retrofitting carried out by our
Technical Service department. This ensures that all work is performed cor-
rectly. If repair work is not carried out by our Technical Service department,
please ensure that the personnel who carry out the repairs are trained and
authorized to do so by Maschinenfabrik Reinhausen GmbH.
Maschinenfabrik Reinhausen GmbH
Technical Service
P.O. Box 12 03 60
93025 Regensburg
Germany
Phone: [phone]

2 Safety
14 5972470/01 EN
E-mail: [email protected]
Internet: www.reinhausen.com
2.4 Personal protective equipment
Personal protective equipment must be worn during work to minimize risks to
health.
▪ Always wear the personal protective equipment required for the job at
hand.
▪ Never wear damaged personal protective equipment.
▪ Observe information about personal protective equipment provided in the
work area.
Personal protective equipment to be worn at all times
Protective clothing
Close-fitting work clothing with a low tearing
strength, with tight sleeves and with no protrud-
ing parts. It mainly serves to protect the wearer
against being caught by moving machine parts.
Safety shoes
To protect against falling heavy objects and slip-
ping on slippery surfaces.
Special personal protective equipment for particular environments
Safety glasses
To protect the eyes from flying parts and splash-
ing liquids.
Visor
To protect the face from flying parts and splash-
ing liquids or other dangerous substances.

2 Safety
155972470/01 EN
Hard hat
To protect from falling and flying parts and mate-
rials.
Hearing protection
To protect from hearing damage.
Protective gloves
To protect from mechanical, thermal, and electri-
cal hazards.

3 Product description
16 5972470/01 EN
This chapter contains an overview of the design and function of the product.
3.1 Scope of delivery
The product is packaged with protection against moisture and is delivered as
follows:
▪ Oil level indicator with TT30 signal converter (optional)
▪ Float gauge with float rod (packed separately if longer than 400mm, oth-
erwise included in the MTO packaging)
▪ Operating instructions
▪ Socket connection cable (optional; ANSI or military)
Please note the following:
▪ Check the shipment against the shipping documents for completeness
▪ Store the parts in a dry place until installation
▪ The product must remain in its protective wrapping and may only be re-
moved immediately before installation
3.2 Function description
The oil level indicator displays the oil level of the transformer's oil conserva-
tor using a float gauge. Monitoring the oil level in the oil conservator helps to
avoid operational faults – such as when filling the transformer. Using the op-
tionally available micro-switches and remote measured value transmission,
you can also transmit the fill level of the oil conservator electronically.
The oil level indicator is comprised of a display part and a transmitter part,
which are connected but can be separated. A magnetic coupling transmits
the lifting movement of the float gauge to the pointer axis in the display part.

3 Product description
175972470/01 EN
Figure1: Function overview
1 Oil level indicator on the oil conser-
vator
2 Oil level indicator
3 Electric switching signals (micro-
switches; optional)
4 Version with TT30 signal converter
(optional)
5 Electronic display 6 SCADA

3 Product description
18 5972470/01 EN
3.3 Design
Depending on the order, the oil level indicator has either a cable screw con-
nection, an NPT screw connection, an ANSI socket or a MIL socket.
Standard version with cable screw connection
As an option, the M25x1.5 cable screw connection is also available in other
versions, such as WADI (water-tight) or offshore.
Figure2: Standard version with cable screw connection
1 Pointer 2 Cover plate
3 Bayonet seal ring including viewing
glass and rubber gasket
4 Cable screw connection (optionally
with connector)
5 MESSKO®TT30 signal converter
(optional)
6 Transmitter part
7 Display part 8 Micro-switch (optional)

3 Product description
195972470/01 EN
Version with 1/2" NPT screw connection
Figure3: NPT screw connection, with locking cap as a transport lock
Version with sockets
Figure4: ANSI socket (left); MIL socket (right)
Ventilation
The oil level indicator has a pressure equalization element for preventing the
build-up of condensation in the device interior.
Figure5: Pressure equalization element

3 Product description
20 5972470/01 EN
3.4 Versions
The oil level indicator can be equipped as follows:
▪ Without micro-switch
▪ With permanently set micro-switches
– A maximum of 3 micro-switches are permanently mounted
– Permanently set micro-switches are secured at the factory and cannot
be subsequently adjusted.
▪ With adjustable micro-switches
– A maximum of 3 micro-switches which can be adjusted across the en-
tire indicator scale.
– The micro-switches are recognizable via the colored switching triangles
(red or blue) on the edge of the dial.
▪ Depending on the design of the oil conservator, the oil level indicator is
available with either radial or axial float movement.
▪ To improve readability, the oil level indicator is available for vertical or in-
clined mounting (with 15°, 30° or 45° angle of inclination).
Version Mounting po-
sition
Micro-switches Float move-
ment
MTO-ST160
MTO-ST160RM
MTO-ST160TT*
MTO-ST160RMTT*
Vertical Maximum 3, adjustable Radial
MTO-STF160
MTO-STF160TT*
Vertical Maximum 3, permanently
set
Radial
MTO-ST160V
MTO-ST160VTT*
Inclined Maximum 3, adjustable Radial
MTO-STF160V
MTO-STF160VTT*
Inclined Maximum 3, permanently
set
Radial
MTO-ST160G
MTO-ST160GTT*
MTO-ST160GRM
MTO-ST160GRMTT*
Vertical or in-
clined
Maximum 3, adjustable Axial