Endress+Hauser OFTE20 User manual

Operating Instructions
Point level switch
OFTE20
BA01325O/09/EN/04.22-00
71573627
2022-05-31

Point level switch Table of contents
3
Table of contents
1 Important document
information ..................... 4
1.1 Document function ................... 4
1.2 Document conventions ................ 4
2 Safety instructions .............. 6
2.1 Requirements for the personnel ........ 6
2.2 Intended use ........................ 6
2.3 Workplace safety .................... 6
2.4 Operational safety ................... 6
3 Identification .................... 7
3.1 Nameplate .......................... 7
3.2 Name and address of manufacturer ..... 7
4 Mounting ........................ 7
4.1 Incoming acceptance, transport,
storage ............................. 7
4.2 Installation conditions ................ 8
4.3 Installation instructions ............... 9
4.4 Post-installation check ............... 13
5 Wiring .......................... 13
5.1 Connection instructions .............. 13
5.2 Quick wiring guide .................. 14
5.3 Post-connection check ............... 16
6 Operation ...................... 17
6.1 Setting the switching threshold
(sensitivity) ........................ 17
6.2 Rotational movement display ......... 17
6.3 Indicator light (optional) ............. 18
6.4 Testing the internal switch ........... 18
7 Commissioning ................ 19
7.1 Post-installation and post-connection
check ............................. 19
7.2 Setting the switching pressure
(sensitivity) ........................ 19
7.3 Switching on the device .............. 19
8 Troubleshooting ............... 19
8.1 Point level switch with rotation
monitoring ........................ 20
9 Maintenance .................. 20
9.1 Cleaning ........................... 20
10 Repair .......................... 21
10.1 General information ................. 21
10.2 Spare parts ........................ 21
10.3 Return ............................ 21
10.4 Disposal ........................... 21
11 Technical data ................. 22
11.1 Input .............................. 22
11.2 Output ............................ 22
11.3 Power supply ....................... 22
11.4 Performance characteristics .......... 23
11.5 Mounting .......................... 24
11.6 Environment ....................... 25
11.7 Process ............................ 25
11.8 Mechanical construction ............. 26
11.9 Operability ......................... 28
11.10 Certificates and approvals ............ 28
11.11 Accessories ........................ 28

Important document information Point level switch
4
1 Important document information
1.1 Document function
These Operating Instructions contain all the information required in the various life cycle
phases of the device: from product identification, incoming acceptance and storage, to
installation, connection, operation and commissioning, through to troubleshooting,
maintenance and disposal.
1.2 Document conventions
1.2.1 Safety symbols
DANGER
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
WARNING
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
CAUTION
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTICE
This symbol contains information on procedures and other facts which do not result in
personal injury.
1.2.2 Electrical symbols
Symbol Meaning
Direct current
Alternating current
Direct current and alternating current
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a
grounding system.
Potential equalization connection (PE: protective earth)
Ground terminals that must be connected to ground prior to establishing any other
connections.
The ground terminals are located on the interior and exterior of the device:
• Interior ground terminal: potential equalization is connected to the supply network.
• Exterior ground terminal: device is connected to the plant grounding system.

Point level switch Important document information
5
1.2.3 Symbols for certain types of information
Symbol Meaning Symbol Meaning
Permitted
Procedures, processes or actions that
are permitted.
Preferred
Procedures, processes or actions that
are preferred.
Forbidden
Procedures, processes or actions that
are forbidden.
Tip
Indicates additional information.
Reference to documentation
A
Reference to page
Reference to graphic
1.
,
2.
,
3.
… Series of steps
Result of a step Visual inspection
1.2.4 Symbols in graphics
Symbol Meaning
1, 2, 3 ... Item numbers
1.
,
2.
,
3.
… Series of steps
A, B, C, ... Views
A-A, B-B, C-C, ... Sections
-
Hazardous area
Indicates the hazardous area.
.
Safe area (non-hazardous area)
Indicates the non-hazardous area.
1.2.5 Tool symbols
Symbol Meaning
A0011220
Flat-blade screwdriver
A0011221
Allen key
A0011222
Open-ended wrench
A0013442
Torx screwdriver

Safety instructions Point level switch
6
2 Safety instructions
2.1 Requirements for the personnel
The personnel for installation, commissioning, diagnostics and maintenance must fulfill the
following requirements:
‣Trained, qualified specialists must have a relevant qualification for this specific function
and task.
‣Are authorized by the plant owner/operator.
‣Are familiar with federal/national regulations.
‣Before starting work, read and understand the instructions in the manual and
supplementary documentation as well as the certificates (depending on the application).
‣Follow instructions and comply with basic conditions.
The operating personnel must fulfill the following requirements:
‣Are instructed and authorized according to the requirements of the task by the facility's
owner-operator.
‣Follow the instructions in this manual.
2.2 Intended use
The device must only be used as a point level switch for specific bulk solids (see Technical data
→  25).
• The device may only be operated when installed.
• The manufacturer accepts no liability for damages resulting from improper or non-
designated use. It is not permitted to convert or modify the device in any way.
2.3 Workplace safety
When working on and with the device:
‣Wear the required personal protective equipment as per national regulations.
2.4 Operational safety
Risk of injury!
‣Operate the device only if it is in proper technical condition, free from errors and faults.
‣The operator is responsible for ensuring trouble-free operation of the device.
Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers:
‣If modifications are nevertheless required, consult with the manufacturer.

Point level switch Identification
7
3 Identification
3.1 Nameplate
Point Level Switch
IP66
DMT 01 ATEX E 040
II 1/2D T110°C
Ta= -20°C...+60°C
230VAC 3,5VA contact ratings max.
250VAC / 6A cos =1j
S/N: XXXXXXXXXXXX
2013 OFTE20-xxxxxxxxxxx
1
2
3
45
6
8
7
0044
!
XXXXXXXXXXXXXXXXXXXX
A0023503
 1 Nameplate of the OFTE20 point level switch (example)
1 Device name
2 Housing degree of protection
3 Manufacturer's address
4 Approvals (optional)
5 Serial number
6 Year of manufacture and order code
7 Output values
8 Power supply and ambient temperature range
3.2 Name and address of manufacturer
Name of manufacturer: Endress+Hauser Wetzer GmbH + Co. KG
Address of manufacturer: Obere Wank 1, D-87484 Nesselwang or www.endress.com
4 Mounting
4.1 Incoming acceptance, transport, storage
Compliance with the permitted environmental and storage conditions is mandatory. Precise
specifications are provided in the "Technical data" section →  22.
4.1.1 Incoming acceptance
On receipt of the goods, check the following points:
• Is the packaging or the content damaged?
• Is the delivery complete? Compare the scope of delivery against the information on your
order form.

Mounting Point level switch
8
4.1.2 Transport and storage
Please note the following:
• Pack the device so that is protected against impact for storage and transport. The original
packaging offers the best protection for this.
• The permitted storage temperature is –20 to 60 °C (–4 to 140 °F).
4.2 Installation conditions
Correct and incorrect installation positions are indicated in →  2,  8.
The device must be protected against direct sunshine. A weather protection cover is available
as an accessory, see the "Accessories" section →  29.
The dimensions of the device are provided in the "Technical data" section →  16,  26.
1
3
2
4
~200 (7.87)
5
6
7
8
A0021567
 2 Orientations of the point level switch, dimensions in mm (in)
Permitted orientations Forbidden orientations
1: Vertical from the top 6: In direction of solids flow
2: Angled from the top 7: Installation coupling too long
3: From the side 8: Horizontal with shaft length >300 mm (11.8 in)
4: From the side with protective cover against falling
solids
5: From the bottom (device must be protected
against shock-type loads)
Ambient temperature range
–20 to 60 °C (–4 to 140 °F)
Medium temperature range
–20 to 80 °C (–4 to 176 °F)

Point level switch Mounting
9
Mechanical load of optional indicator light
The optional indicator light must be protected against mechanical load (impact energy > 1 J).
More information is provided in the "Technical data" section →  25.
4.3 Installation instructions
NOTICE
The device can be damaged if handled incorrectly during installation
‣Do not turn the housing to tighten the process connection. Once the process connection
has been tightened, the housing can be aligned so that the cable entries point downwards.
1
2
3
A0017361
 3 Installation of the standard version
1 Attach sealing ring (1) 60x48x3 mm (2.36x1.89x0.12 in).
2 Insert the rotary paddle into the connecting flange (3). Note: Pay attention to the maximum flange
depth of the connection. With the standard rotary paddle, installation in flange connections is
permitted up to a sleeve length ≤ 40 mm (1.57 in). For sleeve lengths > 40 mm (1.57 in)only the
version with hinged rotary paddle can be used. It must be possible to insert the rotary paddle without
force.
3 Tighten nut with open-ended wrench AF 60 (2).
NOTICE
The device with hinged rotating paddle does not function correctly when the transport
lock is secured.
‣Remove the transport lock (plastic net around the rotating paddle) prior to installation.

Mounting Point level switch
10
1
2
1. 2. 3.
A0017363
 4 Installation of the version with hinged rotary paddle
1 Attach sealing ring (1) 60x48x3 mm (2.36x1.89x0.12 in).
2 Slide the rotary paddle into the connecting flange (3).
3 Tighten nut with open-ended wrench AF 60 (2).
4.3.1 Turning the housing to the right position
A0017364
 5 Correct housing position
4.3.2 Installation of the flange version
The flange version is available as an accessory. The dimensions are provided in the "Technical
data" section →  30.