fafnir UM Series Guide

FAFNIR GmbH • Schnackenburgallee 149 c • 22525 Hamburg • Germany • T.: +49 / 40 / 39 82 07 – 0 • F: +49 / 40 / 390 63 39
Technical Documentation
UM-X
Measurement evaluation unit in field housing
Version: 7
Edition:
2021-02
Art. no.: 207119

I Table of Contents
Table of Contents
1Characteristics of the measurement evaluation unit UM-X....................... 1
2Safety Instructions ................................................................................................2
2.1 Password ...............................................................................................................................................2
3Design and Function ............................................................................................3
3.1 Name plate...........................................................................................................................................3
3.2 Buttons...................................................................................................................................................3
3.3 Display Window ..................................................................................................................................3
3.4 Alarm Light ...........................................................................................................................................4
3.5 Buzzer .....................................................................................................................................................4
4Installation ..............................................................................................................5
4.1 Assembly and Connections ............................................................................................................5
4.2 Pin Assignment ...................................................................................................................................6
4.2.1 Sensor Connection.............................................................................................................................6
4.2.2 Output Circuits ....................................................................................................................................7
4.2.3 Power Supply .......................................................................................................................................7
4.2.4 External Acknowledge Button .......................................................................................................7
5Commissioning......................................................................................................7
6Operation................................................................................................................9
6.1 Layout of the display.........................................................................................................................9
6.1.1 Digital display ......................................................................................................................................9
6.1.2 Multi-function field............................................................................................................................9
6.1.3 Button function field .........................................................................................................................9
6.2 Column Display (Analogue Display)..........................................................................................10
6.3 Relay Status Display ........................................................................................................................10
6.4 Main Menu .........................................................................................................................................11
6.4.1 Navigation...........................................................................................................................................11
6.4.2 Password .............................................................................................................................................12
6.4.3 Switch-on the Backlight .................................................................................................................12
6.5 Unit Menu ...........................................................................................................................................13
6.6 Height Menu......................................................................................................................................14

Table of contents II
6.7 Offset Menu (Zero-Point Displacement) .................................................................................15
6.8 Span menu (measuring range)....................................................................................................16
6.8.1 Span - Change...................................................................................................................................16
6.8.2 Span - Reset.......................................................................................................................................17
6.9 Relays Menu.......................................................................................................................................18
6.9.1 Relays - K1 ... K5................................................................................................................................18
6.9.2 S-P On (Switching Point On)........................................................................................................19
6.9.3 S-P Off (Switching Point Off) .......................................................................................................20
6.9.4 On Delay (switching on delay) ....................................................................................................20
6.9.5 Off Delay (switching off delay)....................................................................................................21
6.9.6 Alarm ....................................................................................................................................................21
6.9.7 Acknowledge Menu ........................................................................................................................22
6.10 Test Menu ...........................................................................................................................................23
6.11 Display Menu.....................................................................................................................................24
6.11.1 Brightness ...........................................................................................................................................24
6.11.2 Off Delay..............................................................................................................................................25
6.11.3 On Delay..............................................................................................................................................25
6.12 Reset Menu ........................................................................................................................................26
6.13 Info Display.........................................................................................................................................26
6.14 Menu structure with factory setting..........................................................................................27
6.15 Alarms ..................................................................................................................................................29
6.15.1 Relay alarm.........................................................................................................................................29
6.15.2 Error.......................................................................................................................................................29
6.15.3 Meaning of the error codes .........................................................................................................29
7Maintenance........................................................................................................30
7.1 Servicing ..............................................................................................................................................30
7.2 Return shipment...............................................................................................................................30
8Technical Data.....................................................................................................30
9List of Figures .......................................................................................................31
10 Annex ....................................................................................................................32
10.1 EU Declaration of Conformity .....................................................................................................32
10.2 EC-Type Examination Certificate ................................................................................................33
10.2.1 Supplement........................................................................................................................................35
10.2.2 Instructions.........................................................................................................................................38

III Table of Contents
© Copyright:
Reproduction and translation are permitted only with the written consent of the FAFNIR GmbH. The FAFNIR GmbH
reserves the right to carry out product alterations without prior notice.

Characteristics of the measurement evaluation unit UM-X
Page 1/2
1Characteristics of the measurement evaluation unit UM-X
The measurement evaluation unit UM-X is a stand-alone filling level display for continuous
level sensors. It is directly driven from the power supply and serves at the same time as a
power supply for the level sensor. The filling level can be presented in both analogue and
digital form on the graphic display.
The measurement evaluation unit UM-X also provides five potential-free changeover contacts.
The switching points for the five relays are set via 4 display buttons and the state of the relays
is shown on the display.
The measurement evaluation unit UM-X
•can be used for any level sensors with a 4-20 mA interface
•can be supplied with ATEX approval (intrinsically safe electrical circuit)
•can be supplied as an approved overfill protection device (see manual Overfill Pro-
tection, German, art. no. 207124)
•displays the filling level in digital and analogue form
•has five potential-free changeover contacts as binary outputs
•offers an easy menu-based operation via a graphic display
•is installed in a splash-proof housing
There are 4 versions of the measurement evaluation unit UM-X:
UM-S
Standard version: Evaluation unit with 5 relay outputs and connector for a continuous level
sensor and for an external acknowledge button.
UM-O
Evaluation unit with 5 relay outputs and connector for a continuous level sensor and for an
external acknowledge button.
Approved as an overfill protection device.
UM-Ex
Evaluation unit with 5 relay outputs and connector for a continuous level sensor and for an
external acknowledge button.
Approved for the connection of an explosion-proof sensor (intrinsically safe sensor circuit).
UM-O Ex
Evaluation unit with 5 relay outputs and connector for a continuous level sensor and for an
external acknowledge button.
Approved as an overfill protection device and for the connection of an explosion-proof sensor
(intrinsically safe sensor circuit).

Page 2/3 Safety Instructions
2Safety Instructions
The measurement evaluation unit UM-X is a stand-alone filling level display for continuous
level sensors. Use the system exclusively for this purpose. The manufacturer accepts no liability
for any form of damage resulting from improper use.
The measurement evaluation unit UM-X has been developed, manufactured and tested in ac-
cordance with the state-of-the art technology and the generally accepted safety standards.
Nevertheless, hazards may still arise. For this reason, the following safety instructions must be
observed:
•Do not change or modify the system or add any equipment without the prior con-
sent of the manufacturer.
•All installation and maintenance work, with the exception of functional testing,
must be carried out with the power disconnected.
•The measurement evaluation unit UM-X must be installed outside the potentially
explosive area.
•The installation, operation and maintenance of the measurement evaluation unit
UM-X must be carried out only by expert personnel. Specialised knowledge must
be acquired by regular training.
•Operators, installers and service technicians must comply with all applicable safety
regulations. This also applies to any local safety and accident prevention regula-
tions which are not stated in this guide.
The safety instructions in this user guide are marked as follows:
If these safety instructions are not observed, it may result in the risk of accident or
damages to the system.
Useful information which ensures continued and correct operation of equip-
ment and makes your work easier.
2.1 Password
You will need a password for certain menu options in order to be able to ac-
cess or amend the points in question.
The password will be advised on an attached sheet and may only be used by
trained personnel!

Design and Function Page 3/4
3Design and Function
3.1 Name plate
The name plate contains e.g. the version of your measurement evaluation unit:
•Device type UM-S, UM-O, UM-Ex or UM-O Ex
•Approvals
Figure 1: Design of the measurement evaluation unit UM-X, view from above
3.2 Buttons
With the four buttons you can navigate through the menu structure and configure the meas-
urement evaluation unit.
The function of these buttons is shown in the function-button field of the display and changes
partly in the individual menus (see Section 6.1 „Layout of the display“).
3.3 Display Window
The display shows the filling level information and is used to adjust the parameters for the
measurement evaluation unit.
Display Window
Alarm light
Buttons
Name plate

Page 4/5 Design and Function
3.4 Alarm Light
The measurement evaluation unit is equipped with a red LED “Alarm” to display alarms and
system faults.
The red LED indicates if the alarm thresholds have been exceeded or fallen below or if faults
have occurred (see Section 6.15 „Alarms“).
3.5 Buzzer
The buzzer provides acoustic alarm messages. The alarm sound is interrupted as soon as the
acknowledge button has been pressed, the cause of the alarm or the fault have been eliminat-
ed. The loudness of the buzzer cannot be adjusted.

Installation Page 5/6
4Installation
The installation must be carried out only by expert personnel and in accordance
with all applicable safety regulations. This also applies to any local safety and ac-
cident prevention regulations which are not stated in this guide.
4.1 Assembly and Connections
The measurement evaluation unit UM-X is designed to be wall-mounted. It can only be
mounted and connected in opened condition:
(1) Loosen the four cover screws.
(2) Carefully remove the cover. It is still connected with the circuit board by means of
two ribbon cables.
(3) Remove the plugs in order to enable the cover to be completely removed.
(4) Now you can mount the measurement evaluation unit.
The measurement evaluation unit must be installed outside the potentially explo-
sive area.
(5) After mounting, connect the cables for the power supply and the level sensor to
the measurement evaluation unit. You can optionally connect an external
acknowledge button and external control devices (see Section 4.2 „Pin Assign-
ment“).
After mounting and connecting all electrical lines, close the measurement evaluation unit
again:
(6) First, carefully plug the wide ribbon cable back into its holder, which is protected
against polarity reversal.
(7) Now reconnect the membrane keyboard with the narrow ribbon cable. Pay
particular attention here to the correct seating of the socket as this does not
have reverse polarity protection.
(8) Close the measurement evaluation unit with the four cover screws.

Page 6/7 Installation
4.2 Pin Assignment
The wiring must be carried out only with the power disconnected. Special local
rules and regulations of relevant Professional Associations and Authorities must
be observed (e.g. VDE in Germany).
Observe the maximum values of the operating parameters that are stated in the
Technical Specifications.
Figure 2: Evaluation unit UM-X, pin assignment
4.2.1 Sensor Connection
The sensor is connected to the terminals 1 (-) and 2 (+).
Display connection
Sensor
Acknowledge
button
Power Supply
Membrane
keyboard
Ack.

Commissioning Page 7/8
4.2.2 Output Circuits
The relays K1 to K5 (terminals 3 to 17) serve as limit signal indicators. There are 5 potential-
free changeover contacts.
Special features of the UM-O and UM-O Ex versions of the device:
–Non-acknowledgeable overfill protection relays:
Relays K1 (terminals 3,4 and 5)
–Acknowledgeable overfill protection relays:
Relays K2 (terminals 6, 7 and 8)
4.2.3 Power Supply
The power supply is connected to the terminals PE, N and L of the circuit board. In the 24 VDC
version + must be connected to L and - to N.
4.2.4 External Acknowledge Button
An external acknowledge button (potential-free NO) can be used. This is connected to the
terminals “Ack.” (18 and 19).
CAUTION MAINS VOLTAGE!
5Commissioning
The measurement evaluation unit is supplied with a factory setting (default) and must be
adapted to the local conditions.
Detailed information for the setting of the measurement evaluation unit can
be found in Section 6 „Operation“.
The values of the factory settings are listed in Section 6.14 „Menu structure
with factory setting“.
For commissioning of the system proceed as follows:
(1) Attach the measurement evaluation unit UM-X to its intended location and insert
the filling-level sensor into the container (see also Section 4).
(2) Connect at least the power supply and the sensor.
(3) During the assembly, ensure that the ribbon cables from the display and from the
membrane keyboard are correctly connected before the measurement evaluation
unit is closed.

Page 8/9 Commissioning
(4) Now switch on the power supply.
(5) Set the 4-mA-point (bottom) and the 20-mA-point (top, container height) on the
level sensor.
(6) Now go to the measurement evaluation unit menu. Select the "Height" item and
enter the container height.
(7) If the 4-mA-point is not at the height of the tank bottom, then set the correct level
in the "Offset" menu.
(8) If the 20-mA-point does not correspond to the container height
−fill your container as full as possible (the 20-mA-point must be above the contain-
er height!),
−then measure the filling height with a dipstick,
−and enter the value in the "Span - Change" menu point.
The 20-mA-point must not be below the container height.
With the device variants UM-O and UM-O Ex (overfill protection devices),
the 20-mA-point must correspond to the container height.
(9) Now you can set the relay switching points.
Changing the offset or the span factor can cause a switching point below 4 mA or
above 20 mA. In that case the relays do not switch as desired and malfunctions
can occur.
Check the current values in the menu items "Relays -> K1…K5 -> S-P On and S-P
Off“ . If the current values are outside of the desired range, "< 4.00 mA“ or ">
20.00 mA“ is displayed under the milliampere unit.

Operation Page 9/10
6Operation
The message "Info” appears for 5 seconds on display after switching on the measurement
evaluation unit. The display then changes automatically to the filling level display in column
form. An overview of the menu structure and the factory-set default values can be found in
Section 6.14 „Menu structure with factory setting“.
Figure 3: Display after switching
on the measurement evaluation unit
Figure 4: Layout of the display
Column display
6.1 Layout of the display
The display is divided into 3 areas (see Figure 4):
6.1.1 Digital display
The current filling level is digitally displayed in the top line.
6.1.2 Multi-function field
The information field has the following functions:
•Analogue display of the filling level or of the relay status.
•Navigation via the menu:
Navigating through the menu structure using buttons.
6.1.3 Button function field
The right column of the display serves as the button function field. The functions of the adja-
cent buttons are displayed here. The functions are matched with the respective menu options.
Digital display
Multi-function field
Button function field
2.1.1.255

Page 10/11 Operation
6.2 Column Display (Analogue Display)
The column shows the filling level graphically. The scaling is in percent and cannot be
changed. The filling level is also displayed digitally (see Figure 4).
There are two possible ways of navigating in the column display:
•Symbol [R] - shows the status of all relays
•Symbol [M] - returns to the main menu
6.3 Relay Status Display
The relay status display gives an overview of the current status
of all relays:
A filled point indicates the status "relay activated”.
An open point indicates the status "relay deactivated".
At the same time, you have an overview of the switching points
of the relays which you set in the "S-P On" and "S-P Off" menu
points.
The symbol
[B] - leads to the column display ("bar graph").
[M] - returns to the main menu.
Figure 5: Relay Status Display

Operation Page 11/12
6.4 Main Menu
The main menu is called up from the "Column display" or "Relay status" display with the but-
ton next to the symbol [M].
You may select the following menu items:
•Unit - Setting the unit
•Height - Setting the container height
•Offset - Setting the distance from the container bottom to the 4-mA-point of the
level sensor
•Span - Selection menu for sensor adjustments, e.g. pressure sensors
•Relays - Selection menu for configuring the relays
•Test - Selection menu for manual control of the relays
•Display - Selection menu for adjusting the display backlight
•Reset - Selection menu for resetting of all values to the factory setting
•Info - Display of device information
If you are in a menu for more than 3 minutes without making any further inputs, the display
automatically returns to the last view - column presentation or relay status. Changes to pa-
rameters, which have not been confirmed are not saved.
6.4.1 Navigation
There are four functions available for scrolling through the different menu items, for calling up
the selected menu item and for saving changed parameters.
Figure 6: Main menu with navigation functions
UP
RETURN
DOWN
BACK

Page 12/13 Operation
Cursor UP [] and Cursor DOWN []
The cursor is moved through the menus with the functions UP [] or DOWN [] shown on
the display. This is how to select the menu items.
RETURN []
The RETURN symbol [] has two functions:
•"Confirm"
In the menu selection, you confirm your selection with RETURN [] and call up a
submenu.
•"Save and Return"
If you have changed parameters in a menu, you save your entries with RETURN [
]. After saving, the next higher-level menu is automatically displayed.
BACK []
The BACK symbol [] has two functions:
•"Back without selecting"
In the menu selection you can jump back one level up with BACK [].
•"Back without saving"
If you have changed parameters in a menu, you can quit the menu item with BACK
[] without saving the new settings.
6.4.2 Password
In the case of menu items, in which the password must be entered, a key is dis-
played instead of the Enter button.
6.4.3 Switch-on the Backlight
If the backlight is reduced to the set minimum, the lamp button is displayed in
the button function field.
When you press the lamp button, the backlight is switched on again and you can
continue to operate the device.

Operation Page 13/14
6.5 Unit Menu
When the menu "Unit” is called up, the cursor automatically lies on the currently set unit. The
following units are available for selection
% - Percent
mm - Millimetre
Inch - Inch (unit specification on the display with <‘’>)
mA– Milliampere
Select with the Functions
UP [] and
DOWN []
the desired unit.
Confirm your selection with RETURN [].
The selected unit is used for the values in the data field and in
the "Relay status" display.
Figure 7: "Unit" display

Page 14/15 Operation
6.6 Height Menu
Enter the container height in the "Height" menu.
The height can be up to 25000 mm and is set in 1-millimetre
steps. The units inches, percent and milliamperes are calculat-
ed and displayed for information.
Enter with the functions
[+] PLUS and
[–] MINUS
the corresponding value.
Confirm your entry with RETURN [].
Figure 8: "Height" display
With the device variants UM-O and UM-O Ex (overfill protection devices) you
need a password to change the container height.
The 20-mA-point of the level sensor must be set to the container height. If this
is not be possible, an adjustment can be made with the "Span" menu item.

Operation Page 15/16
6.7 Offset Menu (Zero-Point Displacement)
The distance from container bottom up to the 4-mA-point of
the level sensor is called the “Offset".
The distance is set in 1-millimetre steps. The units inches, per-
cent and milliamperes are calculated and displayed for infor-
mation.
Enter with the functions
[+] PLUS and
[–] MINUS
the desired value.
Confirm your entry with RETURN [].
Figure 9: "Offset" display
Changing the offset can cause a switching point below 4 mA or above 20 mA. In
that case the relays do not switch as desired and malfunctions can occur.
Check the current values in the menu items "Relays -> K1…K5 -> S-P On and
S-P Off“. They must not be below 4 mA and not above 20 mA.
Example:
The container height is set to 3000 mm and the offset is set to 300 mm - which corresponds
to 10%. Since the relay switching points are set in percentage, these points can also be below
10% and therefore less than 4 mA.
With the device variants UM-O and UM-O Ex (overfill protection devices) you
need a password to change the container height.

Page 16/17 Operation
6.8 Span menu (measuring range)
If you use a sensor for the fill level measurement with a 20-mA-
point which does not match the container height (for example
pressure sensors), adjust the sensor in the "Span" menu. In this
menu you have two options:
• Change and
• Reset.
Select with the functions
UP [] and
DOWN []
the desired option.
Confirm your selection with RETURN [].
Figure 10: "Span" display
With the device variants UM-O and UM-O Ex (overfill protection devices) you
need a password to change the container height.
6.8.1 Span - Change
With the "Change" option, the level of the 20-mA-point can be
changed.
The filling level is set in 1-millimetre steps. The units inches, per-
cent and milliamperes are calculated and displayed for infor-
mation.
Enter with the functions
[+] PLUS and [-] MINUS
the previously measured level.
The change can only be made during operation. The container
must correctly be filled and the correct container height must be
entered, so that deviations remain small. You will find detailed in-
structions in Section 5,„Commissioning“.
Figure 11: "Change" display
Changing the Span can cause a switching point below 4 mA or above 20 mA. In
that case the relays do not switch as desired and malfunctions can occur.
Check the current values in the menu items "Relays -> K1…K5 -> S-P On and
S-P Off“. These must not be below 4 mA and not above 20 mA.