Labom CI4 Series User manual

Pressure transmitter PASCAL Ci4
Type series CI4xxx
LABOM Mess- und Regeltechnik GmbH Im Gewerbepark 13 27798 Hude Germany
BA_072_2020-02_10.00
Hotline: [phone] Fax: [phone] e-mail: [e-mail] www.labom.com
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Operating Instructions
1General Information....................................................................................................... 2
1.1 General Safety Notes .............................................................................................. 2
1.2 Intended Use ........................................................................................................... 2
1.3 Conformity with EU Regulations .............................................................................. 2
1.4 ATEX Approval ........................................................................................................ 2
2Transportation and Storage .......................................................................................... 2
3Installation and Commissioning .................................................................................. 2
3.1 Mechanical Installation ............................................................................................ 2
3.2 Electrical Connection .............................................................................................. 3
3.3 Devices with Diaphragm Seal ................................................................................. 3
3.4 Mounting the Remote Display ................................................................................. 4
4Operation ........................................................................................................................ 5
4.1 Test Terminals ........................................................................................................ 5
4.2 Remove Display / Activate Write Protection ............................................................ 5
4.3 Adjustment of the display contrast .......................................................................... 6
4.4 Maintenance / Service ............................................................................................. 6
5Disassembly ................................................................................................................... 7
6User Manual ................................................................................................................... 8
6.1 Basics of the Operating Concept ............................................................................. 8
6.2 Display Mode / Measured Value Display ................................................................. 9
6.3 Menue Mode / Operating Menue ........................................................................... 12
6.4 The Menue Tree .................................................................................................... 15

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1 General Information
This document contains necessary information for the proper installation and use of this
device. In addition to this instruction, be sure to observe all statutory requirements, appli-
cable standards, the additional technical specifications on the accompanying data sheet
(see www.labom.com) as well as the specifications indicated on the type plate.
1.1 General Safety Notes
The installation, set up, service or disassembly of this device must only be done by
trained, qualified personnel using suitable equipment and authorized to do so.
Warning
Media can escape if unsuitable devices are used or if the installation is not
correct.
Danger of severe injury or damage
 Ensure that the device is suitable for the process and undamaged.
1.2 Intended Use
The device is intended to measure pressure of gases, vapors and liquids as specified in
the data sheet.
1.3 Conformity with EU Regulations
The CE-marking on the device certifies its compliance with the applicable EU Directives for
placing products on the market within the European Union.
You find the complete EU Declaration of Conformity (document no. KE_042) at
www.labom.com.
1.4 ATEX Approval
If you purchased a device with ATEX approval, please refer to the accompanying docu-
ment XA_010, XA_011 resp. XA_022 for ATEX-relevant information.
2 Transportation and Storage
Store and transport the device only under clean and dry conditions preferably in the origi-
nal packaging. Avoid exposure to shocks and excessive vibrations.
Permissible storage temperature: -40…80 °C
3 Installation and Commissioning
Ensure that the device is suitable for the intended application with respect to pressure
range, overpressure limit, media compatibility, temperature range and process connection.
After the mechanical installation and electrical connection is completed, the device is
ready for operation as soon as the power supply is switched on.
3.1 Mechanical Installation
Use gaskets, if required, that are suitable for the process connection and resistant to the
media.
Before starting operation, check the process connection carefully for leaks under pressure.

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You can use the device in any mounting position. Normally the transmitter is adjusted for a
vertical mounting position. A different mounting position in combination with a small nomi-
nal range might cause a zero point offset. In this case a zero point adjustment might be
necessary.
3.2 Electrical Connection
Complete the mechanical installation before you connect the device electrically.
Set up all electrical connections while the voltage supply is switched off.
Output (2-wire) 4...20 mA (20...4 mA)
Permissible supply voltage UV = 12…30 VDC
Permissible load RB ≤ (UV - 12 V) / 22 mA
Circular connector M12
Cable gland
Figure 1: Options for the electrical connection
Pay attention to the following points regarding electrical connections via cable gland and
terminal block:
 Do not forget to tighten the cable gland after the electrical connection is finalised.
 Press down the spring of spring-operated terminals as far as possible, e.g. with a
screwdriver, before you insert the cable. Otherwise a safe electrical connection
cannot be ensured.
3.3 Devices with Diaphragm Seal
Remove the protective cap or protective wrapping from the diaphragm only just before in-
stallation to prevent contamination or damage.
The diaphragm must not be touched. Do not place the device on its diaphragm. Even
small scratches or deformations may negatively influence the zero point or other charac-
teristics of the device.
Pressure transmitter and diaphragm seal are a closed system that must not be separated.
You can find further information about diaphragm seals in the document TA_031 on
www.labom.com.

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3.4 Mounting the Remote Display
Optionally you can mount the display and control unit away from the measuring point in an
additional housing. The back plate of the housing is universally suitable for wall mounting
or pipe mounting for pipe diameters from 30 – 64 mm. For pipe mounting, you can order
the corresponding U-bolts from LABOM.
For best EMC protection, only use the included cable.
If you ordered the remote display together with the device, the assembly has been com-
pleted in the factory. You only need to route the cable and mount the housing with the re-
mote display.
If you have received the remote display as a retrofit kit, proceed as follows:
1. Unmount the front cover and the display unit from the PASCAL Ci4 (see 4.2).
2. Replace them with the adapter piece (round part with M12 socket) and front cover,
which were screwed onto the remote display housing for shipment. Do not forget to
connect the cable on the back with the display connector on the CPU module.
3. The cable may be shortened to on-site requirements. Colour codes on the terminals
indicate which wire should be connected to which terminal (see Figure 2).
4. Mount the remote display housing using the mounting holes to a wall, a pipe or another
suitable location.
5. Plug the M12 connector of the cable into the socket of the adapter piece.
6. Now connect the cable on the display module with the corresponding connector on the
terminal board in the remote housing and insert the display module in the same man-
ner as for the device itself (see 4.2).
7. The last step is to close the remote housing with the display cover that was previously
on the device.
Colour codes
BN/BR: Brown
WH/WS: White
BU/BL: Blue
BK/SW: Black
Figure 2: Connection of the remote display housing
This modification can be performed during operation. We do recommend, however, to
switch off the device during the modification.

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Figure 3: Remote display and control unit after installation
4 Operation
During operation, take care that the device remains within its intended pressure and tem-
perature ranges. No other monitoring is necessary.
Permissible ambient temperature: -40…80 °C
4.1 Test Terminals
You can check the output current without interrupting the current loop, using the test ter-
minals on the terminal board. When you connect a current meter to the "+Test" and "-Test"
terminals, the current is automatically routed through it.
Figure 4: Current measurement during operation using test terminals
4.2 Remove Display / Activate Write Protection
Using the DIP switch in the device, you can disable changes to the configuration via the
display or via HART (not for type series CI4xx3 with a process connection on the back).
To activate the write protection, you must first remove the display module. Proceed as fol-
lows:
 Unscrew the front cover
 Turn the display module 20° counterclockwise
 Lift off the display module carefully

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Figure 5: Removing the display
After removing the display module you can reach the DIP switch on the CPU module. The
write protection is active when the DIP switch is in the "ON" position.
Figure 6: Write protection via slide switch in the device
Re-mount the display module in the reverse order.
4.3 Adjustment of the display contrast
The display contrast can be adjusted (display software version 2.0.5 and above).
Press and hold the ESC key and use the arrow keys to adapt the contrast.
The setting is saved and the contrast screen closes as soon as the ESC key is released.
4.4 Maintenance / Service
When properly installed in accordance with applicable specifications, this device is
maintenance-free. However, we recommend an annual recalibration of the device.
In case of damage or defects, the customer can replace the following elements:
 Display module
 Cable glands (if applicable)
For defects to other components, repairs must be performed in the factory.

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5 Disassembly
When measuring hot media, make sure that the device has cooled down prior to any dis-
mounting or wear appropriate protective clothing to avoid burns.
Switch off the power supply to the device before disconnecting the electrical connections.
Once this is done, the device may be mechanically removed.
Warning
Opening pressurized lines might cause severe injuries.
Danger of severe injuries or damage
 Relieve the process pressure before attempting to remove the device.
Shut off the pressure supply for all feed lines to the device and relieve the
pressure in them.
Warning
Hazardous deposits and residues might remain on opened process connec-
tions and removed devices.
Danger of injury
 After the device has been removed, seal off the measuring point and
mark the open process connection accordingly. Consider a possible dan-
ger due to residues when handling the removed device.

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6 User Manual
The device can be configured via the display module as well as the HART protocol. The
following pages describe operation and configuration of the device using the display mod-
ule. (valid from display module software version 2.0.0).
An overview of the menue structure can be found on the last page of this document.
6.1 Basics of the Operating Concept
The display module consists of a dot-matrix
display with 80x128 pixels as well as a
4-button control panel.
The four buttons below the display allow an
intuitive operation of the device. The gen-
eral functionality of the buttons is identical in
all operating modes.
Figure 7: Control elements
If you press and hold the up or down button, it will automatically be triggered multiple
times. This allows to easily navigate through longer selection lists. If you press and hold
the ESC button, you always return to the measured value display.
Button Function
/ Select function, increase/decrease value
OK Confirm selected function or selected value
ESC Cancel action
ESC long Return to measured value display
Table 1: General button functions
The structure of the display is the same in every operating mode. The display area is di-
vided into four zones:
Header
Icon indicating device status
Data area
Bar graph related to the currently measured value
Figure 8: Display structure

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The icon for the device status (see 6.2.3) as well as the bar graph is displayed in each op-
erating mode. The bar graph always shows the state of the current output (4 mA = 0%, 20
mA = 100%). The contents of the header and the data area depend on the operating
mode:
Display of measured value
 Header: Icon description, if applicable. Otherwise "Value"
 Data area: Measured values and parameters according to the selected display
mode (see 6.2.4)
Display of device data (see 6.2.1)
 Header: Title for the displayed device data
 Data area: Device data
Operating menue
 Header: Selected menue item
 Data area: Submenue or dialogue during setting procedure
6.2 Display Mode / Measured Value Display
After applying the supply voltage and completion of the initialisation, the device switches to
the display mode. In the display, the currently measured value is shown.
If the measured value is larger than the displayable number due to setting a fixed decimal
point or an inappropriate unit, the largest displayable number is shown flashing. In this
case please select a different setting of the decimal point or a different unit.
In display mode you can review the device data, enter the menue or lock/unlock the
menue.
Button
Function
/
Scroll through the pages with device data
ESC
Return to measured value display
OK
Go to the operating menue
ESC+OK long
Activate / deactivate menue lock (see 6.3.2)
Table 2: Button functions in display mode
6.2.1 Quick Access to Device Data
You can access a number of device parameters directly from the measured value display
using the / -buttons. This allows a quick overview of the device configuration.
With the -button you can display variable data (trailing pointers and counters), with the
-button static information such as configuration data.
From any screen of the device data, you can enter the operating menue with OK and go
back to the measured value display by pressing ESC.

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The sequence of the screens with device data is as follows:
 Counter (operating hour counter, maintenance timer)
 Trailing pointer (pressure and sensor temperature)
 ----- Measured value display (starting point) ---
 Pressure measurement (rel/abs, nominal range, measuring range, damping)
 Current output (characteristic curve, alarm current, limits)
 HART data (address, tag, descriptor, date)
 Device identification (device ID, order number, serial number)
 Module information (hardware and software versions, serial numbers)
6.2.2 Locking the Menue
You can lock the menue with a key combination at the device. Press and hold the ESC-
key and press then OK to activate the menue lock. Hold down both keys until the display
confirms that the menue lock has been activated. You can still access the device data but
the menue is now locked.
An active menue lock is indicated by the header text „Write protection“ in combination with
the lock icon.
Use the same key combination to unlock the menue again. The menue cannot be un-
locked with the key combination if the hardware DIP-switch is activated.
6.2.3 Icons indicating device status
In the top right corner of the display, depending on the device status an NE107-conform
icon is displayed. The following icons are defined:
Error/failure
Critical error, alarm current is activated
The error description is indicated in the display. Nach
dem Quittieren des Fehlers erfolgt ein Neustart.
Warning
Temperature or pressure limits are exceeded.
Saturation
The output current has reached the pre-set upper or lower
current limit.
Function control
The output current corresponds to the measured value or
current simulation, but not to the applied pressure value.
Maintenance
The device indicates necessary maintenance due to
maintenance timer settings (see 6.4.6.2).
Write protection
The write protection of the device was activated via the
DIP switch, HART or with the key combination in the dis-
play.
Table 3: Icons for device state
The list of icons is sorted in descending priority. Only the icon with the highest priority is
shown. The two most important icons for fault and/or warning are flashing when displayed.

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6.2.4 Display layouts
You can configure the layout of the measured value display as well as the displayed infor-
mation individually. There are five different layouts available:
Designation
Layout
Description
Example
Five values
Under the main value, four additional
values are shown.
Four values
Under the main value, three additional
values are shown. One of these can
use the entire display width.
Three val-
ues
Under the main value, two additional
values are shown. Both of them can
use the entire display width.
Two values
Two values are shown in the same
size, one under the other.
Large dis-
play
The main value is shown at the maxi-
mum size (best readability from a dis-
tance). One additional value can also
be shown.
Table 4: Display layouts
You can define what information shall be shown in the layout’s placeholders.
You can select the 1st value (main value) from the following data:
1. Pressure with the selected unit
2. Pressure in per cent of the measuring range
3. Pressure in milliampere
For all further values, you can additionally choose from the following data:
 Sensor temperature
 Static pressure on minus-side (for devices with differential pressure cell, type
Ci4x4x)
 ATC temperature (for devices with the ATC option)
 Device ID (see 6.4.9.1)
 HART tag
 HART descriptor
When information (such as the device ID) cannot be displayed in a short layout placehold-
er, "###" appears on the screen. Then select another layout or assign the value to a longer
layout placeholder.
You can configure the display mode in the operating menue (see 6.4.4.2).

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6.3 Menue Mode / Operating Menue
Press OK in the measured value display to go to the operating menue. Then the main
menue appears in the display.
In the operating menue you can navigate in the menues by using the arrow buttons. The
selected menue item is indicated by triangles on the left and right. The OK button selects
the menue item or switches to the corresponding submenue. You can return to the higher-
level menue by pressing ESC. From the main menue, pressing ESC returns to the meas-
ured value display.
From every position in the operating menue, you can return to the measured value display
by pressing and holding the ESC button (for at least one second).
Figure 9: The Operating menue
In long menues and selection lists, a scroll bar on the left side shows the position of the
currently selected item.
Menue items that open a setting dialogue differ from submenues by three trailing points,
e.g. "Lower range …" (setting dialogue) and "System" (submenue).
If no button is pressed in menue mode for five minutes, the device automatically returns to
the display mode without saving any values.
Button Function
Scroll up in the menue, increase value/position in list
Scroll down in the menue, decrease value/position in list
OK Select menue, confirm value/list entry
ESC Cancel the data entry or menue selection, return to the next higher
menue
ESC long Cancel menue mode, return to display mode
Table 5: Button functions in the operating menue

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6.3.1 Displaying and entering parameters
When entering parameters, either numerical inputs or a selection lists with fixed options is
available.
In general, the actual selection will be displayed first (view mode). Press OK to switch to
edit mode to change the parameter. After this is done, the display will then switch back to
view mode so that you can check the new setting.
6.3.1.1 Selection of a value from a selection list
Up to three options are shown at the same time in one selection list. When the selection
list is longer, a scroll bar on the left side of the display indicates the position of the selected
item in the selection list.
When you press the ESC button, you cancel the entry and go back to view mode. The se-
lected value is not saved.
With the OK button, the selected value is saved. Saving the value is confirmed with an in-
formation window and the new value is shown in view mode.
With ESC, you leave the view mode and return to the menue.
Figure 10: Procedure for value selection (e.g. changing language from english to german)
6.3.2 Setting a numeric value
When setting numeric values, the screen shows the following elements (from top to bot-
tom):
Designation of the parameter that can be set
Help text (if applicable)
Numeric value and unit
Function of buttons
Bar graph
After selecting a menue item for numerical entry (e.g. damping), at first the value is dis-
played only. The numeric value itself is shown in square brackets and its unit behind it.
Unused leading digits are marked with bottom lines. You need to press OK again to enter
the edit mode.
Numeric values are entered digit by digit. First, always the leftmost digit is selected (visible
with a triangle above and below the number). By pressing OK, you go to the next digit.

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Figure 11: Elements when setting a numeric value
You change the selected digit by pressing the or button. The higher value digit is
also increased or decreased when passing zero. For instance, you can easily go from 19
to 20 without having to edit two digits.
Lower value digits are not influenced, unless the parameter limit is reached. The value is
then set to the parameter limit.
You can set negative numbers by decreasing the value below zero.
When you press the ESC button, you can cancel the entry at any time and return to the
display of the set value. Any change of the value is not saved.
With the OK button you confirm the set digit value and jump to the next digit.
When you confirm the rightmost digit, the entire value is saved. You can save the new val-
ue from any digit by pressing and holding the OK button.
Figure 12: Procedure for setting a numeric value (e.g. from 1.0 to 0.9)

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6.4 The Menue Tree
In the following, the display and adjustment options are described by their position in the
menue tree. An overview of the menue tree can be found on the last page of this docu-
ment.
6.4.1 Main menue
The main menue has the following entries:
Menue entry
Description
Quick setup
Selection of the most important settings
Adjustment
Adjustment functions for pressure measurement and current out-
put
Display
Functions for configuring the display
Measurement/output
Configuration of the pressure measurement and current output
Diagnosis
Diagnostic information such as min/max values
Simulation
Simulation of pressure and current for function check of the
measurement chain
Communication
Information and settings regarding HART communication
System
Device data and function such as factory reset
Tabelle 6: The main menue
6.4.2 "Quick Setup" menue
In Quick Setup, basic configuration options are combined to make it possible to quickly
configure key functions. All functions of the quick setup can also be found at another posi-
tion in the menue tree.
The following functions are available in the Quick Setup menue:
Menue entry
Description
Sprache/Language
Select menue language
Unit Pressure
Select unit for measured pressure (see 6.4.4.1)
Unit Temperature
Select unit for sensor temperature and for ATC-temperature (if
applicable) (see 6.4.4.1)
Lower Range Value
Setting of the pressure value that should correspond to 4 mA
(start of range) (see 6.4.5.4)
Upper Range Value
Setting of the pressure value that should correspond to 20 mA
(end of range) (see 6.4.5.4)
Damping
Setting the damping of the output signal (see 6.4.5.1)
Device ID
Setting the device ID (see 6.4.9.1)
Config.-memory
Configuration memory: reading, writing and status (see 6.4.9.3)
Table 7: "Quick Setup" menue

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6.4.3 "Adjustment" menue
The following functions are available for the adjustment:
Menue entry
Description
Zero point
Set device at ambient pressure to zero (0 bar rel) (not with abso-
lute pressure devices)
Position correction
Correct zero point error due to installation position (not with abso-
lute pressure devices)
Lower adjustment
Offset correction with applied reference pressure
Upper adjustment
Span correction with applied reference pressure
Table 8: "Pressure Adjustment" menue
For devices with differential pressure cell (type CI4x4x) you can also correct the zero point
of the static pressure measurement. For these devices there is an additional menue entry
called "Zero point pst".
6.4.3.1 Zero-point correction
The zero-point correction requires a non-pressurized pressure port e.g. during calibration
in the lab. When executing this function the applied pressure will be interpreted as zero bar
relative pressure.
The zero point correction results in an offset of the whole characteristic curve. Therefore it
is a special case of the lower adjustment (see below).
6.4.3.2 Position correction
Using the function "Position correction", you can correct the offset error due to the installa-
tion position independent of the zero-point offset.
In the corresponding submenue, you will find the following entries:
Menue entry
Description
Pos.corr. on/off
Activate/deactivate position correction
Set pos. corr.
Correct position error at ambient pressure
Table 9: "Position Correction" submenue
When you set the position correction, it will be activated automatically. You can deactivate
the position correction, for instance for a subsequent calibration to check the zero point
independently from the installation position.

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6.4.3.3 Upper and lower adjustment
The lower adjustment results in an offset of the characteristic curve. It thus affects zero
and span of the measuring range.
The upper adjustment changes the slope of the characteristic curve by correcting the span
of the measuring range.
Execute the lower adjustment prior to the upper adjustment for a correct full adjustment.
Figure 13: Effect of the upper and lower adjustment on the characteristic curve
You can perform the upper and lower adjustment at any reference pressure level. For in-
stance, you can perform the lower adjustment of a -1…4 bar device at -900 mbar rel. The
reference pressure level for the upper offset can also be freely chosen. To ensure that the
adjustment is as precise as possible, the upper and lower adjustment should be performed
as close as possible to the lower range value and upper range value of the measurement
ranges.
6.4.3.4 Current adjustment
You can use the current adjustment, if the reading at the end of the measurement chain
(re-converted current value) does not correspond to the measured pressure. With this
function you can compensate deviations in the output stage as well as the downstream
measurement chain.
Proceed as follows (example for 4 mA):
 Select function "Current adjustment" –> "4mA"
 Use "OK" to activate constant current mode (4 mA). CAUTION! The output current
value now no longer corresponds with the measured pressure! This is indicated by
the icon "Function check" (see 6.2.3).
 Read the displayed current value at the end of the measurement chain.
 Enter this current value (e.g. 3.996) at the device. The device now corrects the cur-
rent output so that 4 mA are shown at the end of the measurement chain.
When leaving the function, the constant current mode is disabled and the current value
corresponds again to the measured pressure.

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6.4.4 "Display" menue
In the "Display" menue, you find all the settings that affect the display on the screen.
Menue entry
Description
Language
Select menue language
Units
Setting units for the different measured and displayed values
Screen mode
Configuration of the screen layout and content (see 6.2.4)
Decimal point
Select setting of decimal point to determine number of decimal
places
Backlight
Switch backlight on/off
Table 10: "Display" menue
6.4.4.1 Submenue "Units"
You can select the unit of every value shown on the display. These settings do not affect
the internal calculations of the device or HART communication.
The shown conversions are only meant for your orientation. The device uses conversion
values with ten decimal places.

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Pressure unit
The unit in which the measured pressure is to be shown can be selected from the following
list:
Unit
Description
mbar
Millibar (1 mbar = 0,001 bar)
bar
Bar (1 bar = 1000 mbar = 105 Pa)
Pa
Pascal (1 Pa = 1 kg/(m*s2) = 10-5 bar = 0,01 mbar)
hPa
Hectopascal (1 hPa = 100 Pa = 1 mbar)
kPa
Kilopascal (1 kPa = 1.000 Pa = 10 mbar)
MPa
Megapascal (1 MPa = 1.000.000 Pa = 10 bar)
g/cm2
Gramme per square centimetre (1 g/cm2 = 0,981 mbar)
kg/cm2
Kilogramme per square centimetre (1 kg/cm2 = 0,981 bar)
psi
Pound force per square inch (1 psi = 68,9 mbar)
atm
Atmospheric pressure (1 atm = 1013 mbar)
mmH2O
Millimetre water column (1 mmH2O = 0,0981 mbar)
mH2O
Metre water column (1 mH2O = 98,1 mbar)
inH2O
Inch water column (1 inH2O = 2,49 mbar)
ftH2O
Foot water column (1 ftH2O = 29,84 mbar)
Torr
Torr (1 Torr = 1 mmHg = 1,33 mbar)
mmHg
Millimetre mercury column (1 mmHg = 1,33 mbar)
inHg
Inch mercury column (1 inHg = 33,86 mbar)
Table 11: Possible units for pressure
Temperature unit
The unit in which the temperature is to be shown can be selected from the following list:
Unit
Description
°C
Degree Celsius
°F
Degree Fahrenheit ( TFahrenheit = TCelsius*1,8 + 32 )
°R
Degree Rankine ( TRankine = TKelvin*1,8 )
K
Kelvin ( TKelvin = TCelsius + 273,15 )
Table 12: Possible units for temperature

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6.4.4.2 “Display mode” submenue
In the "Display mode" submenue, you configure the representation of the measured values
and additional information on the display.
With the menue item “Screen layout” you configure the information that is displayed and its
layout. Up to five values can be displayed at the same time. In the additional menue en-
tries "1st value" to "5th value" you define the contents of the placeholders in the layout.
The various layouts as well as the possible content of the values are described in Chapter
6.2.4.
6.4.5 "Measurement/Output" menue
Configure the measured value as well as the current output in the "Measurement/output"
menue.
Menue entry
Description
Damping
Setting the damping of the output signal
Measuring rate
Setting the measuring rate (20 or 100 Hz), except for devices with
differential pressure cell, type CI4x4x
Output function
Setting the output function (linear, inverse, square root, table)
Lower Range Value
Setting the pressure value that shall correspond to 4 mA (start of
range)
Upper Range Value
Setting the pressure value that shall correspond to 20 mA (end of
range)
Output table
Specifying the points for the table function
Alarm current
Select the alarm current: High (>21 mA) or low (<3.6 mA)
Lower current limit
Limit of the lower output current (3.8…4.0 mA)
Upper current limit
Limit of the upper output current (20…21 mA)
Table13: "Measurement/Output" menue
Independent from the setting of the upper and lower current limit, the set measuring range
always corresponds to a current range of 4…20 mA.