montwill M3 Series User manual

Technical features:
red display from -19999…99999 digits (optional green, orange, blue or tricolour display)
installation depth: 120 mm without plug-in screw terminal
multi voltage power supply unit 100-240 VAC, alternatively 10-40 VDC galvanic isolated
adjustment via factory setting or directly on the sensor signal
min/max-memory with adjustable permanent display
30 additional adjustable support points
display flashing at threshold value exceedance / undercut
simplified adjustment U/min (turns/minute) with only 3 parameters
Schmitt-Trigger-Input
digital frequency filter for contact bounce suppression and interference suppression
frequency filter with different pulse-duty factor
navigation keys for the triggering of Hold, Tara, display change, setpoint setting, alarm actuation
flexible alarm system with adjustable delay times
volume measurement (Totaliser) for frequencies up to 1 kHz (pulse exact)
mathematical functions like reciprocal value, square root, square and rounding
constant setting / setpoint setting
sliding averaging
brightness control via parameter or front keys
programming interlock via access code
protection class IP65 at the front
plug-in screw terminal
sensor supply incl. galv. isolated digital input
optional: 1 or 2 relay outputs
optional: 1 independently scalable analog output
optional: interface RS232 or RS485
accessories: pc-based configuration-kit PM-TOOL with CD & USB adapter for devices without a
keypad and a simple adjustment of standard devices
User manual M3
Frequency input: 0.01 Hz to 999.99 kHz / 0.01 Hz to 9.999 kHz / 0-2.5000 kHz
Connection for Namur, 3-wire NPN/PNP or for position survey via incremental
encoder (HTL- or TTL-output)
96x24
M3_3FGB.pdf update: 28.05.2020

Identification
STANDARD TYPES ORDER NUMBER
Frequency
Housing size: 96x24 mm
M3-3FR5B.0307.S70xD
M3-3FR5B.0307.W70xD
Please state physical unit by order, e.g. m/min.
Options – breakdown of order code:
M 3- 3 F R 5 B. 0 3 0 7. W 7 2 x D
Standard type M-Line Dimension
D physical unit
Installation depth
145 mm 3 Version
incl. plug-in terminal x internal version
Housing size Switching points
B96xH24xD120 mm 3 0 no switching point
1 1 relay output
Display type 2 2 relay outputs
Frequency F
Protection class
Display colour 1 no keypad,
Blue B operation via PM-TOOL
Green G 7 IP65 / plug-in terminal
Red R
Yellow Y Voltage supply
S 100-240 VAC
Number of digits W 10-40 VDC galv. isolated
5-digit 5
Measuring input
Digit height 7 0.01 Hz - 999.99 kHz
14 mm B
Analog output
Interface 0 none
without 0 X 0-10 VDC, 0/4-20 mA
RS232 3
RS485 4 Sensor supply
2 10 VDC / 50 mA
3 24 VDC / 50 mA
K 24 VDC / 50 mA
incl. digital input
incl. digital input
incl. digital input
and pulse output (10 kHz)

Contents
1
1. Brief description 2
2. Assembly 2
3. Electrical connection 3
4. Function description and operation 5
4.1. Programming software PM-TOOL 6
5. Setting up the device 7
5.1. Switching on 7
5.2. Standard parameterisation (flat operation level) 7
Value assignment for the triggering of the signal input
5.3. Programming interlock 11
Activation/Deactivation of the programming interlock or change into professional
or flat operation level
5.4. Extended parametersation (professional operation level) 12
5.4.1. Signal input parameters „ “ 12
Value assignment for the triggering of the signal input incl. linearisation
5.4.2. General device parameters „ “ 16
Superior device functions like Hold, Tara, min/max permanent, setpoint value function /
nominal value function, averaging, brightness control, as well as the control of the digital input and
keyboard layout
5.4.3. Safety parameters „ “ 20
Assignment of user and master code to lock or to receive access to defined parameter such as
analog output and alarms, etc.
5.4.4. Serial parameters „ “ 21
Parameter for interface definition
5.4.5. Analog output parameters „ “ 22
Analog output functions
5.4.6. Relay functions „ “ 24
Parameter for setpoint definition
5.4.7. Alarm parameters „ “ 26
Actuator and dependencies of the alarms
5.4.8. Totaliser (Volume metering) „ “ 28
Parameter for calculation of the sum function
6. Reset to factory settings 29
Reset parameters onto the delivery state
7. Alarms / Relays 30
Functional principle of the switching outputs
8. Interfaces 31
Connection RS232 and RS485
9. Programmer examples 32
Sample applications such as e.g. calculation of the input frequency or the adjustment at unknown rotation speed
10. Technical data 35
11. Safety advices 37
12. Error elimination 38

1. Brief description
2
1. Brief description
2. Assembly
Please read the Safety advices on page 37 before installation and keep this user manual for future reference.
Sealing
Installation depth including plug-in terminal
(depth depends on options)
145,0 (154,0)
96,0
24,0
Gap for physical unit
3,0
1. After removing the fixing elements, insert the device.
2. Check the seal to make sure it fits securely.
3. Click the fixing elements back into place and tighten the clamping screws by hand. Then use a
screwdriver to tighten them another half a turn.
CAUTION! The torque should not exceed 0.1 Nm!
The dimension symbols can be exchanged before installation via a channel on the side!
2. Assembly
The panel meter M3-3F can evaluate pulses in many different ways and show the result in the 5-digit LED-
display. Available options are: frequency coverage with optional filters, summate of pulses or display values via
time, detection of a rotational speed or collection of a position via an incremental encoder. The results can be
monitored via alarm conditions and can be displayed onto the optional switching point. Furthermore the results
can be freely scaled on an optional analog output and relayed to a control system. The device can be operated
directly by Namur sensors, 3-wire sensors, switching/slider contacts, incremental encoders (HTL-/TTL-output)
or TTL-signals.
Via the 3 navigation keys on the front, the device can be adjusted onto different kind of applications and later on
different functions of the device can be controlled. The adjustment is also possible via the PC-Software PM-
TOOL with a special connecting cable. With an individual code, the created parameterisation can be protected
against changes of the user.
Numerous applications can be realised with this device, like e.g. tachometer, revolution counter, flowmeter,
dosing equipment, filling capacity meter, baking time meter of a baking oven, flying knife, position evaluation,
position surveillance, flow rate surveillance, acoustic discharge measurements and so on. By use of the
integrated, configurable functions like permanent min/max-recording, averaging, frequency filter, setpoint
setting, threshold value recording via alarm system, 30-points-linearisation, mathematic charging and many
more, you receive an universal applicable modern instrument for your demands in measuring and control
technique.

3
3. Electrical connection
3. Electrical connection
Type M3-3FR5B.0307.S70xD supply 100-240 VAC 50/60Hz, DC ±10%
Type M3-3FR5B.0307.W70xD supply 10-40 VDC galv. isolated, 18-30 VAC 50/60Hz
Connection examples:
Advice:
If Namur sensors with a nominal voltage of approx. 8 V are used, then a sensor supply of 12 VDC is needed.
TT L
or
Namur
Pulse input 1
_+
Sensor
supply
24 VDC
24 V
3-wire
sensor
N L
+
_
10-40VDC
or
100-240VAC
8 9 10 11 12 13 14 157654321
Digital input
Options:
11 12 13 8 9 10
S2
11 12 13 11 12 13
S1
Relay 2 Relay 1
14 15
10 V
0/4 - 20 mA
Analog output
0 V
168 9 10 8 9 10
Interface RS232
(Modbus protocol)
GND
TxD
RxD
8 9 10
Interface RS485
(Modbus protocol)
GND
Data B+
Data B-
or
Alternatively to analog output
or
TTL
or
Namur
Pulse input 2
24 V
3-wire
sensor
alternatively to
pulse input 2
5
Pulse output
max. 10 kHz
or
Voltage
supply

4
3. Electrical connection
Connection examples:

4. Function and operation description
5
4. Function and operation description
Level Key Description
Menu level
Change to parameterisation level and deposited values.
Keys for up and down navigation in the menu level.
Change into operation mode by pushing both navigation keys
at the same time.
Parameterisation
level
To confirm the changes made at the parameterization level.
Adjustment of the value / the setting.
Change into menu level or stop of the value input, by pushing
both navigation keys at the same time.
Menu group level
Change to menu level.
Keys for up and down navigation in the menu group level.
Change into operation mode or return into menu level, by
pushing both navigation keys at the same time.
Operation
The operation is divided into three different levels.
Menu level (delivery status)
The menu level is designed for the standard settings of the device. Only menu items which are sufficient to set
the device into operation are displayed. To get into the professional level, run through the menu level and
parameterise ““ under menu item .
Menu group level (complete function volume)
Suited for complex applications as e.g. linkage of alarms, setpoint treatment, totaliser function etc. In this level,
function groups which allow an extended parameterisation of the standard settings are availabe. To leave the
menu group level, run through this level and parameterise „ „ under menu item .
Parameterisation level:
Parameter deposited in the menu item can here be parameterised. Functions, that can be changed or
adjusted, are always signalised by a flashing of the display. Settings that are made in the parameterisation
level are confirmed with [P] and thus saved. Pressing the [O]-key („zero-key“) leads to a break-off of the value
input and to a change into the menu level. All adjustments are saved automatically by the device and it
changes into operating mode, if no further key operation is done within the next 10 seconds.

6
4. Function and operation description
4.1 Parameterisation software PM-TOOL:
Included in the delivery of the PM-TOOL are the software on CD and an USB-cable with device adapter.
The connection happens via a 4-pole micromatch-plug on the back side of the device, to the PC-side the
connection happens via an USB plug.
System requirements: PC incl. USB interface
Software: Windows XP, Windows VISTA
With this tool the device configuration can be generated, omitted and saved on the PC. The parameters can
be changed via the easy to handle program surface, whereat the operating mode and the possible selection
options can be preset by the program.
Function chart:

7
Menu level Parameterisation level
Selection of the input signal,
Default:
If the scaling of the device is done via (Sensor calibration), the frequency range needs to
be preset under and is adjusted by application of the final value/initial value. If
(Factory calibration) is preferred, the final value needs to be entered under and the final
frequency needs to be entered under . Under the initial value needs to be entered and
under the initial frequency. There is no application of the measuring signal. Confirm the
selection with [P] and the display switches back to menu level.
Adjustment of pulses per rotation, :
Default:
This parameter is only important if = or = have been selected. Generally it
shows the number of pulses per rotation.
Setting end value of the measuring range, :
Default:
Choose between six different frequency ranges. Confirm the selection with [P] and the display
switches back to menu level.
5.1. Switching-on
Once the installation is complete, start the device by applying the voltage supply. Before, check once again
that all electrical connections are correct.
Starting sequence
For 1 second during the switching-on process, the segment test ( ) is displayed, followed by an
indication of the software type and, after that, also for 1 second, the software version. After the starting
sequence, the device switches to operation/display mode.
5.2. Standard parameterisation: (flat operation level)
To parameterize the display, press the [P]-key in operating mode for 1 second. The display then changes to
the menu level with the first menu item .
5. Setting up the device
5. Setting up the device
9.9999 Hz 99.999 Hz 999.99 Hz 9.9999 kHz
99.999 kHz 999.99 kHz

8
5. Setting up the device
Menu level Parameterisation level
Setting the final value of the measuring range, :
Default:
Set the final value from the smallest to the highest digit with [▲] [▼] and confirm each digit
with [P]. A minus sign can only be parameterized on the leftmost digit. After the last digit, the
display switches back to the menu level. If was selected as input option, you can only
select between and With , only the previously set display value is taken over, and
with , the device takes over both the display value and the analogue input value.
Setting the start/offset value of the measuring range, :
Default:
Enter the start/offset value from the smallest to the highest digit [▲] [▼] and confirm each digit
with [P]. After the last digit the display switches back to the menu level. If was selected
as the input option, you can only select between and With , only the previously set
display value is taken over, and with , the device takes over both the display value and the
analogue input value.
Setting the decimal point, :
Default:
The decimal point on the display can be moved with [▲] [▼] and confirmed with [P]. The
display then switches back to the menu level again.
Setting up the display time, :
Default:
The display time is set with [▲] [▼]. The display moves up in increments of 0.1 up to 1 second
and in increments of 1.0 up to 10.0 seconds. Confirm the selection by pressing the [P] button.
The display then switches back to the menu level again.
Rescaling the measuring input values,
Default:
With this function, you can rescale the input value of e.g. 8.000 Hz (works setting) without
applying a measuring signal. If sensor calibration has been selected, these parameters are not
available.
then

9
5. Setting up the device
Menu level Parameterisation level
Rescaling the measuring input values,
Default:
With this function, you can rescale the input value of e.g. 100 Hz (works setting) without
applying a measuring signal. If sensor calibration has been selected, these parameters are not
available.
Setting of the pulse delay,
Default:
With the pulse delay of 0–250 seconds (maximum), frequencies can be collected, which are
even smaller than by the predetermined measuring time of the device. If e.g. a delay of 250
seconds is set, this means that the device waits up to 250 seconds for an edge, before it
assumes a 0 Hz frequency. Thus frequencies up to 0.004 Hz can be collected.
Adjustment of the optimum digital frequency filter,
Default:
If the optional filter is not activated by the adjustment „ “, frequences are ignored by the
adjusted frequency filter. Act on the assumption that the pulse-duty factor is 1:1. Accordingly
the minimal pulse duration is derived from the half of the time of oscillation. Use a filter of 10 Hz
or 20 Hz for contact bounce suppression.
Selection of analog output,
Default:
Three output signals are available: 0-10 VDC, 0-20 mA and 4-20 mA, with this function, the
demanded signal is selected.
Setting up the final value of the analog output,
Default:
The final value is adjusted from the smallest digit to the highest digit with [▲] [▼] and digit by
digit confirmed with [P]. A minus sign can only be parameterised on the leftmost digit. After the
last digit, the device changes back into menu level.

10
5. Setting up the device
Menu level Parameterisation level
Setting up the initial value of the analog output,
Default:
The final value is adjusted from the smallest digit to the highest digit with [▲] [▼] and digit by
digit confirmed with [P]. A minus sign can only be parametrised on the leftmost digit. After the
last digit, the device changes back into menu level.
Threshold values / limit values,
Default:
For both limit values, two different values can be parameterized. With this, the parameters for
each limit value are called up one after another.
Hysteresis for limit values,
Default:
For all limit values exists a hysteresis function, that reacts according to the settings (threshold
exceedance / threshold undercut).
Function if display falls below / exceeds limit value,
Default:
The limit value undercut can be selected with (LOW = lower limit value) and limit value
exceedance can be selected with (HIGH = upper limit value). If e.g. limit value 1 is on a
switching threshold of 100 and occupied with function „ “, the alarm will be activated by
reaching the threshold. If the limit value is allocated to „ “, an alarm will be activated by
undercut of the threshold. See page 29.
Threshold values / Limits,
Default:
This value defines the threshold, that activates/deactivates an alarm.
Hysteresis for limit values,
Default:
The delayed reaction of the alarm is the difference to the threshold value, which is defined by
the hysteresis.

11
5. Setting up the device
Menu level Parameterisation level
Function for threshold value undercut /exceedance,
Default:
A limit value undercut is selected with (for LOW = lower limit value), a limit value
exceedance with (for HIGH = higher limit value). If e.g. limit value 1 is on a threshold level
of 100 and allocated with function , an alarm is activated by reaching of the threshold level.
If the threshold value was allocated to an alarm will be activated by undercutting the
threshold value, as long as the hysteresis is zero.
User code (4-digit number-combination, free available), :
Default:
If this code is set (>0000), all parameters are locked, if has been selected before under
menu item . By pushing [P] during operation mode for approx. 3 seconds, appears in
the display. To get to the unlocked reduced parameter, the user needs to enter the preset
. This code has to be entered before each parameterisation, until the (Master code)
unlocks all parameters again.
Master code (4-digit number-combination free available), :
Default:
With this code, all parameters can be released, if has been activated before under menu
item . By pushing [P] during operation mode for approx. 3 seconds, appears in the
display. The user can now reach all parameters by entering . Leaving the para-
meterisation, under menu item , the user can unlock them permanently by choosing or
. So, there is no need for anew code entering, even by pushing [P] during operation mode
again.
5.3. Programming interlock „ “
Activation / deactivation of the programming lock or completion of the standard
parameterisation with change into menu group level (complete function range),
Default:
With the navigation keys [▲] [▼], choose between the deactivated key lock (works
setting) and the activated key lock , or the menu group level . Confirm the selection with
[P]. After this, the display confirms the settings with ", and automatically switches to
operating mode. If was selected, the keyboard is locked. To get back into the menu level,
press [P] for 3 seconds in operating mode. Now enter the (works setting ) that
appears using [▲] [▼] plus [P] to unlock the keyboard. appears if the input is wrong.
To parameterise further functions needs to be set. The device confirms this setting with
„ „ and changes automatically in operation mode. By pressing [P] for approx. 3 seconds
in operation mode, the first menu group is shown in the display and thus confirms the
change into the extended parameterisation. It stays activated as long as is entered in
menu group , thus the display is set back in standard parameterisation again.

5. Setting up the device
12
5.4. Extended parametrisation (Professional operation level)
Menu level Parameterisation level
Selection of the input signal,
Default:
If the scaling of the device is done via (Sensor calibration), the frequency range needs to
be preset under and is adjusted by application of the final value/initial value. If
(Factory calibration) is preferred, the final value needs to be entered under and the final
frequency needs to be entered under . Under the initial value needs to be entered and
under the initial frequency. There is no application of the measuring signal. Confirm the
selection with [P] and the display switches back to menu level.
Adjustment of pulses per rotation, :
Default:
This parameter is important if = or = have been selected. Generally it shows
the number of pulses per rotation.
Setting the end value of the measuring range, :
Default:
Choose between six different frequency ranges. Confirm the selection with [P] and the display
switches back to menu level.
Setting the final value of the measuring range, :
Default:
Set the final value from the smallest to the highest digit with [▲] [▼] and confirm each digit
with [P]. A minus sign can only be parameterized on the leftmost digit. After the last digit, the
display switches back to the menu level. If was selected as input option, you can only
select between and With , only the previously set display value is taken over, and
with , the device takes over both the display value and the analogue input value.
Menu group level
Menu level
5.4.1. Signal input parameters
9.9999 Hz 99.999 Hz 999.99 Hz 9.9999 kHz
99.999 kHz 999.99 kHz

13
5. Setting up the device
Menu level Parameterisation level
Setting the start/offset value of the measuring range,
Default:
Enter the start/offset value from the smallest to the highest digit [▲] [▼] and confirm each digit
with [P]. After the last digit the display switches back to the menu level. If was selected
as the input option, you can only select between and With , only the previously set
display value is taken over, and with , the device takes over both the display value and the
analogue input value.
Setting the decimal point,
Default:
The decimal point on the display can be moved with [▲] [▼] and confirmed with [P]. The
display then switches back to the menu level again.
Setting up the display time,
Default:
The display time is set with [▲] [▼] . The display moves up in increments of 0.1 to 1 second
and in increments of 1.0 to 10.0 seconds. Confirm the selection by pressing the [P] button. The
display then switches back to the menu level again.
Rescaling the measuring input values,
Default:
With this function, you can rescale the input value of e.g. 8.000 Hz (works setting) without
applying a measuring signal. If sensor calibration has been selected, these parameters are not
available.
Rescaling the measuring input values,
Default:
With this function, you can rescale the input value of e.g. 100 Hz (works setting) without
applying a measuring signal. If sensor calibration has been selected, these parameters are not
available.
then

14
5. Setting up the device
Menu level Parameterisation level
Setting up the pulse delay, :
Default:
With the pulse delay of 0–250 seconds (max), frequencies can be collected, which are even
smaller than by the predetermined measuring time of the device. If e.g. a delay of 250 seconds
is set, this means that the device waits up to 250 seconds for an edge, before it assumes a
0 Hz frequency. Thus frequencies up to 0.004 Hz can be collected.
Adjustment of the optimum digital frequency filter,
Default:
If the optional filter is not activated by the adjustment „ “, frequences are ignored by the
adjusted frequency filter. Act on the assumption that the pulse-duty factor is 1:1. Accordingly
the minimal pulse duration is derived from the half of the time of oscillation. Use a filter of 10 Hz
or 20 Hz for contact bounce suppression.
Adjustment of the pulse-duty factor at activated digital filter,
Default:
Adjustment of the desired pulse-duty factor for pulse duration and pulse interruption. Like this, a
special pulse behaviour can be adjusted.
Setting up the tare/offset value,
Default:
The given value is added to the linerarized value. In this way, the characteristic line can be
shifted by the selected amount.
Number of additional switching points,
Default:
30 additional switching points can be defined to the initial value and final value, so linear sensor
values are not linearised. Only activated setpoint parameters are displayed.

5. Setting up the device
15
Menu level Parameterisation level
Display values for switching points,
Under this parameter switching points are defined according to their value. At the sensor
calibration, like at final value/offset, one is asked at the end if a calibration shall be activated.
Analog values for switching points,
These switching points are displayed at works setting (4-20 mA) only. Here, demanded analog
values can be choosen freely. The input of steadily rising analog values needs to be done self-
contained.
Display underflow,
Default:
With this function the device undercut ( ) can be defined on a definite value.
Display overflow,
Default:
With this function the display overflow ( ) can be defined on a definite value.
Input variable of process value, :
Default:
This parameter controls the device via the analog input signals = repectively
or via the digital signals of the interface = RS232/RS485 (Modbus protocol). Confirm the
selction with [P] and the device changes back into menu level.
Back to menu group level,
With [P] the selection is confirmed and the device changes into menu group level .

5. Setting up the device
16
5.4.2. General device parameters
Menu level Parameterisation level
Display time,
Default:
The display is set up with [▲] [▼]. Thereby on switches until 1 second in steps of 0.1 and until
10.0 seconds in steps of 1.0. With [P] the selection is confirmed and the device changes into
menu level.
Rounding of display values,
Default:
This function is for instable display values, where the display value is changed in increments of
1, 5, 10 or 50. This does not affect the resolution of the optional outputs. With [P] the selection
is confirmed and the device changes into menu level.
Arithmetic,
Default:
With this function the calculated value, not the measuring value, is shown in the display. With
, no calulation is deposited. With [P] the selection is confirmed and the device changes into
menu level.
Sliding average determination,
Default:
Here, the number of the meterings that need to be averaged is preset. The time of averaging
results of the product of measuring time and the averaged metering . With the selection
of in the menu level the result will be shown in the display and evaluated via the
alarms.
Menu group level
Menu level
then
Reciprocal Root extraction Square

5. Setting up the device
17
Menu level Parameterisation level
Dynamic for the sliding average determination,
Default:
With the sliding average determination can be adjusted dynamically. If or was
selected, a frequency value with a variance of 6% or 12% of the current display value is taken
over directly for the sliding averaging. The display appears to be more dynamic at a fast
frequency change, without appearing disturbed by a slightly unsteady frequency.
Zero point slowdown,
Default:
At the zero point slowdown, a value range around the zero point can be preset, so the display
shows a zero. If e.g. a 10 is set, the display would show a zero in the value range from -10 to
+10; below continue with -11 and beyond with +11.
Definite contstant value, :
Default:
The constant value can be evaluated via the alarms or via the analog output, like the current
measurand. The decimal place cannot be changed for this value and is taken over by the
current measurand. Like this a setpoint generator can be realised via the analog output by this
value. Furthermore it can be used for calculating the difference. At this the constant value is
substracted from the current measurand and the difference is evaluated in the alerting or by the
analog output. Thus regulations can be displayed quite easily.
Minimum constant value, :
Default:
The minimum constant value is adjusted from the smallest to the highest digit with the
navigation keys [▲] [▼]and confirmed digit per digit with [P]. A minus sign can only be
adjusted on the leftmost digit. After the last digit the display changes back into menu level.
Maximum constant value, :
Default:
The maximum constant value is adjusted from the smallest to the highest digit with the
navigation keys [▲] [▼]and confirmed digit per digit with [P]. A minus sign can only be
adjusted on the leftmost digit. After the last digit the display changes back into menu level.

5. Setting up the device
18
Menu level Parameterisation level
Display,
Default:
With this function the current measurand, min/max value, totaliser value, the process-controlled
Hold-value, the sliding average value, the constant value or the difference between constant
value and current value can be allocated to the display. With [P] the selection is confirmed and
the device changes into menu level.
Brightness control, :
Default:
The brightness of the display can be adjusted in 16 levels from 00 = very dark to 15 = very
bright via this parameter or alternatively via the navigation keys from the outside. During the
start of the device the level that is deposited under this parameter will always be used, even
though the brightness has been changed via the navigation keys in the meantime.
Display flashing,
Default:
A display flashing can be added as additional alarm function either to single or to a combination
of off-limit condition. With , no flashing is allocated.
Assignment (deposit) of key functions,
Default:
For the operation mode, special functions can be deposited on the navigation keys [▲] [▼], in
particular this function is made for devices in housing size 48x24mm which do not have a 4th
key ([O]-key). If the min/max-memory is activated with , all measured min/max-values are
safed during operation and can be recalled via the navigation keys. The values get lost by
restart of the device. If the threshold value correction or is choosen, the values of the
threshold can be changed during operation without disturbing the operating procedure. With
the device is tared to zero and saved permanently as offset. The device confirms the
correct taring by showing in the display. switches into the offset value and can be
changed via the navigation keys [▲] [▼].