FISCHER ER76 User manual
Operating manual
ER76
Control relay for level probes
DNV-GL version
09015289 • BA_EN_ER76 • Rev. ST4-D • 10/23
*09015289*
| Masthead FISCHER Mess- und Regeltechnik GmbH
2/20 BA_EN_ER76
Masthead
Manufacturer: FISCHER Mess- und Regeltechnik GmbH
Bielefelderstr. 37a
D-32107 Bad Salzuflen
Telephone: +49 5222 974 0
Telefax: +49 5222 7170
eMail: [email protected]
web: www.fischermesstechnik.de
Technical editorial team: Documentation representative: T. Malischewski
Technical editor: R. Kleemann
All rights, also those to the translation, reserved. No part of this document may
be reproduced or processed, duplicated or distributed using electronic systems
or any other form (print, photocopy, microfilm or another process) without the
written consent of the company FISCHER Mess- und Regeltechnik GmbH, Bad
Salzuflen.
Reproduction for internal use is expressly allowed.
Brand names and procedures are used for information purposes only and do
not take the respective patent situation into account. Great care was taken
when compiling the texts and illustrations; Nevertheless, errors cannot be ruled
out. The company FISCHER Mess- und Regeltechnik GmbH will not accept any
legal responsibility or liability for this.
Subject to technical amendments.
© FISCHER Mess- und Regeltechnik 2020
Version history
Rev. ST4-A 10/20 Version 1 (first edition)
Rev. ST4-B 04/21 Version 2 (new housing)
Rev. ST4-C 07/21 Version 3 (CE declaration updated)
Rev. ST4-D 10/23 Version 4 (DNV certificate updated)
FISCHER Mess- und Regeltechnik GmbH Table of contents
BA_EN_ER76 3/20
Table of contents
1 Safety instructions.......................................................................................................... 4
1.1 General................................................................................................................................... 4
1.2 Personnel Qualification .......................................................................................................... 4
1.3 Risks due to Non-Observance of Safety Instructions............................................................. 4
1.4 Safety Instructions for the Operating Company and the Operator ......................................... 4
1.5 Unauthorised Modification...................................................................................................... 4
1.6 Inadmissible Modes of Operation........................................................................................... 4
1.7 Safe working practices for maintenance and installation work............................................... 5
1.8 Pictogram explanation............................................................................................................ 5
2 Product and functional description............................................................................... 6
2.1 Delivery scope........................................................................................................................ 6
2.2 Device versions ...................................................................................................................... 6
2.3 Intended use........................................................................................................................... 7
2.4 Function diagram.................................................................................................................... 7
2.5 Design and mode of operation ............................................................................................... 8
3 Assembly ......................................................................................................................... 9
3.1 General................................................................................................................................... 9
3.2 Electrical connection .............................................................................................................. 9
4 Start-up ............................................................................................................................ 11
5 Servicing .......................................................................................................................... 12
5.1 Maintenance........................................................................................................................... 12
5.2 Transport ................................................................................................................................ 12
5.3 Service ................................................................................................................................... 12
5.4 Disposal.................................................................................................................................. 12
6 Technical data ................................................................................................................. 13
6.1 General................................................................................................................................... 13
6.2 Input variables ........................................................................................................................ 13
6.3 Output sizes ........................................................................................................................... 13
6.4 Auxiliary energy...................................................................................................................... 13
6.5 Operating conditions .............................................................................................................. 13
6.6 Construction design................................................................................................................ 14
7 Order codes ..................................................................................................................... 15
7.1 Accessories ............................................................................................................................ 15
8 Attachment ...................................................................................................................... 16
1 | Safety instructions FISCHER Mess- und Regeltechnik GmbH
4/20 BA_EN_ER76
1 Safety instructions
1.1 General
This operating manual contains basic instructions for the installation, operation
and maintenance of the device that must be followed without fail. It must be
read by the installer, the operator and the responsible specialist personnel be-
fore installing and commissioning the device.
This operating manual is an integral part of the product and therefore needs to
be kept close to the instrument in a place that is accessible at all times to the re-
sponsible personnel.
The following sections, in particular instructions about the assembly, commis-
sioning and maintenance, contain important information, non-observance of
which could pose a threat to humans, animals, the environment and property.
The instrument described in these operating instructions is designed and manu-
factured in line with the state of the art and good engineering practice.
1.2 Personnel Qualification
The instrument may only be installed and commissioned by specialized person-
nel familiar with the installation, commissioning and operation of this product.
Specialized personnel are persons who can assess the work they have been
assigned and recognize potential dangers by virtue of their specialized training,
their skills and experience and their knowledge of the pertinent standards.
1.3 Risks due to Non-Observance of Safety Instructions
Non-observance of these safety instructions, the intended use of the device or
the limit values given in the technical specifications can be hazardous or cause
harm to persons, the environment or the plant itself.
The supplier of the equipment will not be liable for damage claims if this should
happen.
1.4 Safety Instructions for the Operating Company and the
Operator
The safety instructions governing correct operation of theinstrument must be
observed. The operating company must make them available to the installation,
maintenance, inspection and operating personnel.
Dangers arising from electrical components, energy discharged by the medium,
escaping medium and incorrect installation of the device must be eliminated.
See the information in the applicable national and international regulations.
Please observe the information about certification and approvals in the Tech-
nical Data section.
1.5 Unauthorised Modification
Modifications of or other technical alterations to the instrument by the customer
are not permitted. This also applies to replacement parts. Only the manufacturer
is authorised to make any modifications or changes.
1.6 Inadmissible Modes of Operation
The operational safety of this instrument can only be guaranteed if it is used as
intended. The instrument model must be suitable for the medium used in the
system. The limit values given in the technical data may not be exceeded.
The manufacturer is not liable for damage resulting from improper or incorrect
use.
FISCHER Mess- und Regeltechnik GmbH Safety instructions | 1
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1.7 Safe working practices for maintenance and installation work
The safety instructions given in this operating manual, any nationally applicable
regulations on accident prevention and any of the operating company's internal
work, operating and safety guidelines must be observed.
The operating company is responsible for ensuring that all required mainten-
ance, inspection and installation work is carried out by qualified specialized per-
sonnel.
1.8 Pictogram explanation
DANGER
Type and source of danger
This indicates a direct dangerous situation that could lead to death or serious
injury (highest danger level).
1. Avoid danger by observing the valid safety regulations.
WARNING
Type and source of danger
This indicates a potentially dangerous situation that could lead to death or ser-
ious injury (medium danger level).
1. Avoid danger by observing the valid safety regulations.
CAUTION
Type and source of danger
This indicates a potentially dangerous situation that could lead to slight or seri-
ous injury, damage or environmental pollution (low danger level).
1. Avoid danger by observing the valid safety regulations.
NOTICE
Note / advice
This indicates useful information of advice for efficient and smooth operation.
2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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2 Product and functional description
2.1 Delivery scope
• ER76 according to specification (see order code)
• Operating Manual
2.2 Device versions
Probe connection Probe connection 1+2
Status LED 1+2
1 Channel 2 Channel
Status LED
Supply
Switching output
Supply
Switching output 1+2
Fig.1: Device versions
Bestellnummer Switch output Supply Ub
ER76 1 000000 1 1 relay contact 230 V AC
ER76 1 000000 4 1 relay contact 24 V AC
ER76 2 000000 1 2 relay contacts 230 V AC
ER76 2 000000 4 2 relay contacts 24 V AC
2.2.1 Type plate
This type plate serves as an example of the information that is stated. The data
shown is purely fictive, but does correspond to the actual conditions. For more
information, please see the order code at the end of these instructions.
Art. No.
Supply
Power
Input
Function
Load data
Temp. range
Prod.-Nr.
ER7610000001
230 VAC 50/60 Hz
max. 5 VA
0 ... 200 kOhm
interval
250 VA
-10 .... +70 °C
2106821.00.002
FISCHER Mess- und Regeltechnik GmbH Bielefelder Str. 37a D32107-Bad Salzuflen
Order codes
Serial number
Technical data
Fig.2: Type plate
FISCHER Mess- und Regeltechnik GmbH Product and functional description | 2
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2.3 Intended use
Control relay ER76 can be used in connection with type NK06 level probes for
the automatically controlling and regulating conductive liquid filling levels in tank
systems.
2.4 Function diagram
min
max
NK06
com
max
min 230 V AC
24 V AC
2
3
1
ER76 1 ...
L
N
-K1
K1
Rest position Working contact
ER76 2 ...
com1
L
N
max1
min1
230 V AC
24 V AC
K1 K2
com2
max2
min2
NK06
-K1 -K2
Container 1
Container 2
Fig.3: Function diagram
2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
8/20 BA_EN_ER76
2.5 Design and mode of operation
ER76 is controlled by the medium using a type NK06 probe. Input sensitivity is
factory-adjusted to 70 kΩ. In order for the relay to switch properly, the medium-
conductivity must not fall below a value of 14µS/cm.
When contact is made, an alternating voltage without a direct voltage compon-
ent flows through the medium, preventing galvanic erosion of the probe mater-
ial.
Depending on the application, location or national regulations, the control elec-
trodes' reference potential can be represented by a common electrode as well
as by the container itself.
After the level probe has been installed and the control relay has been electric-
ally connected, the contact switches to the working position. LED is on.
If the maximum level is reached, the output relay switches to the rest position.
LED is off. This state remains until the level falls below the minimum level and
the contact switches to the working position again.
If the supply voltage fails, there is a defect in the control circuit or an interruption
in the measuring line, the system goes into the safe state (normally closed con-
tact) and thus prevents the container from being overfilled.
FISCHER Mess- und Regeltechnik GmbH Assembly | 3
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3 Assembly
3.1 General
CAUTION
Risks connected to medium or system
The builder or operator of the tank system must take suitable protective meas-
ures for installation and maintenance.
3.2 Electrical connection
• By authorized and qualified specialized personnel only.
• When connecting the unit, the national and international electro-technical
regulations must be observed.
• Disconnect the system from the mains, before electrically connecting the
device.
• Install the consumer-adapted fuses.
• Do not connect the connector if strained.
3.2.1 ER76 with one relay
L1
N
PE
F
M
24 V AC
230 V AC
F
NK06 NK06
M
Pump Pump
230 V AC 24 V AC
24 V AC
Fig.4: Automatic level control with a relay (example)
3 | Assembly FISCHER Mess- und Regeltechnik GmbH
10/20 BA_EN_ER76
ER76 switch output does not necessarily have to be used for direct pump con-
trol. It can also be used as a monitoring signal for an electronic control system.
3.2.2 ER76 with two relays
L1
N
PE
F
M1
24 V AC
230 V AC
F
NK06
Pumps
230 V AC 24 V AC
24 V AC
NK06
Tank 2Tank 1
NK06 NK06
Tank 2Tank 1
M2
M1
Pumps
M2
Fig.5: Automatic level control with two relays (example)
With the ER762… two containers can be monitored with one relay. One pos-
sible application would be, for example, controlling a tank for crude oil dewater-
ing and a storage tank for separated water at the same time.
Here, too, switch outputs can be used as monitoring signals for an electronic
control system.
FISCHER Mess- und Regeltechnik GmbH Start-up | 4
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4 Start-up
Proper installation of all electrical supply and signal lines is a prerequisite for
commissioning. All connections are arranged so that there are no mechanical
forces acting on the device.
ER76 is a control relay for NK06 conductive level probes. Please check the tank
system for leaks before commissioning.
The function test for the ER76 with one relay is described below. For devices
with two relays, the second channel works the same as the first channel.
Function test:
1. Switch on the ER76 supply.
ÊRelay K1 switches and the associated LED lights up.
2. Fill the tank until the maximum filling level is reached.
ÊRelay K1 drops out and the associated LED goes out.
3. Empty the tank until it falls below the minimum level.
ÊRelay K1 switches and the associated LED lights up.
uThis ends the function test.
Malfunctions
ER76 control relay is a very reliable device. If an error occurs during commis-
sioning, first check the electrical connections. A cable may be mixed up or there
is an interruption.
5 | Servicing FISCHER Mess- und Regeltechnik GmbH
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5 Servicing
5.1 Maintenance
The instrument is maintenance-free. We recommend the following regular in-
spection to guarantee reliable operation and a long service life:
• Check the function in combination with downstream components.
• Check the electrical connections.
The exact test cycles need to be adapted to the operating and environmental
conditions. In combination with other devices, the operating instructions for the
other devices also need to be observed.
5.2 Transport
The measuring device must be protected against impacts. It should be transpor-
ted in the original packaging or a suitable transport container.
5.3 Service
All defective or faulty devices should be sent directly to our repair department.
Please coordinate all shipments with our sales department.
WARNING
Process media residues
Process media residues in and ondismantled devices can be a hazard to
people, animals and the environment. Take adequate preventive measures. If
required, the devices must be cleaned thoroughly.
Return the device in the original packaging or a suitable transport container.
5.4 Disposal
Please help to protect the environment by always disposing of the work pieces
and packaging materials in compliance with the valid national waste and recyc-
ling guidelines or reuse them.
FISCHER Mess- und Regeltechnik GmbH Technical data | 6
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6 Technical data
6.1 General
Type designation ER76
Inputs for conductive probes 1 or 2
Switch outputs 1 or 2
Measurement principle Conductive
6.2 Input variables
Measuring range The measuring range (fill level) is de-
termined by the connected conductive
probe.
Input signal
COM, MIN, MAX
Probe rods covered: A current flows
between the rods.
Probe rods uncovered: No current
flows between the rods.
Adjustment range Set
Input sensitivity 0 … 200 kΩ 70 kΩ
Medium conductivity --- ≥ 14 µS/cm
Input sensitivity is preset at the factory and cannot be changed on site.
6.3 Output sizes
Switching function 2-point controller
Switch output 1 or 2 potential-free changeover con-
tacts
Max. switching voltage 250 V AC
Max. switching current 2 A
Max. switching output 250 VA
Switching status display LED
6.4 Auxiliary energy
Nominal voltage 230 V AC
24 V AC
Absorbed power Max. 5 VA
6.5 Operating conditions
Ambient temperature range -10 °C … +70 °C
Storage temperature range -10 °C … +70 °C
Housing protection class
Terminal protection class
IP40
IP20
NSR EN 61010-1:2010 + A1:2019 +
A1:2019/AC:2019
EMC EN 61326-1:2013
EN 61326-2-3:2013
RoHS EN IEC 63000:2018
DNV-GL On all vessels in accordance with the
provisions of the DNVGL (class
guideline: DNVGL-CG-339)
Certificate No. TAA00001ZU
6 | Technical data FISCHER Mess- und Regeltechnik GmbH
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6.6 Construction design
Electrical connection Screw terminals
Installation position User-defined
Assembly *) Assembly of the mounting rails
Dimensions 68 x 75 x 110 mm
Weight (max.) 280 g
380 g
ER76 1-Channel
ER76 2-Channel
*) A cut-to-size mounting rail and end clamps are available as accessories for
wall mounting.
6.6.1 Materials
Housing Polycarbonate / acrylonitrile butadiene
styrene (ABS-PC)
Terminals Polyamide (PA), Cu alloy
6.6.2 Dimension drawing
All dimensions in mm unless otherwise stated
68
75
110
Fig.6: Dimension drawing ER76 1 channel
The 2-channel version has the same dimensions.
FISCHER Mess- und Regeltechnik GmbH Order codes | 7
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7 Order codes
0 0E R 7 6 0 0 00
12 567834
Version
Operating voltage
Type
Identification No.
Design:
[1] (Code no.)
11-way relay
22-way relay
Operating voltage:
[8] (Code no.)
1230 V AC
424 V AC
7.1 Accessories
Order no. Discription
NK06 Conductive level probe
09001380 35 mm mounting rail perforated; 122 mm long
09001479 End clamp 6mm wide
8 | Attachment FISCHER Mess- und Regeltechnik GmbH
16/20 BA_EN_ER76
8 Attachment
Fig.7: CE_DE_ER76
FISCHER Mess- und Regeltechnik GmbH Attachment | 8
BA_EN_ER76 17/20
Fig.8: TAA00001ZU-page_1
8 | Attachment FISCHER Mess- und Regeltechnik GmbH
18/20 BA_EN_ER76
Fig.9: TAA00001ZU-page_2
FISCHER Mess- und Regeltechnik GmbH
BA_EN_ER76 19/20
Notes
Mess- und Regeltechnik GmbH
Bielefelder Str. 37a
D-32107 Bad Salzuflen
Tel. +49 5222 974-0
Fax +49 5222 7170
www.fischermesstechnik.de
Technische Änderungen vorbehalten. Subject to technical changes. Sous réserve de modifications techniques.
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