Ahlborn ALMEMO 204 User manual

____________________________
Operating instructions
english
V7 special measuring instrument
ALMEMO® 204
for digital sensors
V1.0
13.01.2020
www.ahlborn.com

1. Operating controlse
1. OPE ATING CONT OLSE
(1) Measuring sockets M0, M3
M0...M3 for digital ALM MO®
sensors DIGI, D6, D7 only
M0.0...M3.9 for up to 40 meas. chan.
(2) Output socket A1, A2
A1 USB interface (ZA 1919-DKU)
Optic fiber (ZA1909-DKL)
V24 (ZA1909-DK5)
thernet (ZA1945-DK)
Trigger input (ZA1006-ET/EK2)
Relay outputs (ZA1006-EGK)
Analog output 1 (ZA160x-RI/RU)
A2 Network cable (ZA1999-NK5/NKL)
Plug-in memory (ZA1904-SD)
Trigger input (ZA1006-ET/EK2)
Relay outputs (ZA1006-EKG)
Relay t igge adapte (ZA1006-RTA)
Analog output 2 (ZA160x-RI/RU)
(3) Connection socket DC 12V
Mains adapter (ZA1312-NA10, 12V, 2A)
Cable, el. isol. (ZA2690-UK, 10-30V)
(4) LCD graphics display
7 rows for functions
1 row for softkeys F1,◄,▲,►, F2
Shown in b ackets: < MENU > , <FCT>
(5) Operating keys
ON To switch device ON
To switch device OFF: p ess and hold down
F1 , F2 Function keys (Softkeys)
▲, ▼ ... M: To select a measu ing point
▲, ▼, ► F: To select a menu
PROG , ▼... F: To select a function
◄ ... return to menu selection
< M ◄◄ > go di ectly to the meas. menu
< F ►► > go di ectly to the meas. menu
PROG To program
▲, ▼, ►... To enter data
Rear of device:
(6) Battery compartment
3 AA alkaline-manganese batteries
2 ALM MO® 204

Table of contents
2. TABLE OF CONTENTS
1. OPE ATING CONT OLSE.......................................................................2
2. GENE AL................................................................................................... 6
2.1 Warranty..............................................................................................6
2.2 Standard delivery...............................................................................7
2.3 Waste disposal................................................................................... 7
3. SAFETY INST UCTIONS..........................................................................8
3.1 Special notes on use..........................................................................9
3.2 Handling batteries / rechargeable batteries correctly.....................9
4. INT ODUCTION.......................................................................................10
4.1 Functions of the ALMEMO® 204......................................................11
4.1.1 Sensor programming................................................................11
4.1.2 Measuring operation.................................................................12
4.1.3 Process control.........................................................................13
5. PUTTING INTO SE VICE........................................................................16
6. POWE SUPPLY..................................................................................... 17
6.1 Battery operation and supply voltage monitoring.........................17
6.2 Mains operation................................................................................17
6.3 External DC voltage supply.............................................................17
6.4 Sensor supply...................................................................................18
6.5 Switching ON / OFF, reinitialization................................................18
6.6 Data buffering...................................................................................18
7. CONNECTING SENSO S / T ANSDUCE S..........................................18
7.1 Standard sensor (V5).......................................................................19
7.2 D6 sensors........................................................................................19
7.3 D7 sensors........................................................................................19
7.4 Measuring inputs und additional channels....................................20
7.5 Potential separation.........................................................................20
8. DISPLAY AND KEYPAD..........................................................................21
8.1 Display and menu selection............................................................21
8.2 Measured value display and status symbols.................................21
8.3 Function keys...................................................................................22
8.4 Function selection............................................................................23
8.5 To enter data.....................................................................................23
9. MENU SELECTION..................................................................................25
10. MEASU ING MENUS..............................................................................26
10.1 Sensor display menu.....................................................................26
10.1.1 Measuring channel selection..................................................26
10.2 Measured value correction and compensation............................26
10.2.1 Setting measured values to zeron..........................................27
10.2.2 Atmospheric pressure compensation.....................................27
ALM MO® 204 3

2. Table of contents
10.3 Measuring points list menu...........................................................28
10.4 User menu U2 - data logger...........................................................28
11. MEASU ED DATA SCANNING AND OUTPUT......................................29
12. USE MENUS...........................................................................................29
12.1 Functions........................................................................................29
12.2 Configuration of user menus........................................................31
13. FUNCTIONS MENUS...............................................................................32
13.1 Maximum, minimum, individual value memory...........................32
13.2 Averaging........................................................................................33
13.2.1 Smoothing meas. values by means of a sliding average........33
13.2.2 Averaging over manually selected meas. operations..............34
13.2.3 Averaging over time................................................................35
13.2.4 Averaging over a cycle...........................................................35
13.2.5 Averaging over measuring points...........................................36
13.2.6 Volume flow measurement.....................................................36
13.3 Two-point adjustment with Setpoint entry...................................37
13.4 Scaling.............................................................................................37
13.5 Data logger functions.....................................................................38
13.5.1 Internal data memory..............................................................38
13.5.2 xternal plug-in memory incorporating Memory card.............38
13.5.3 Numbering of measuring operations.......................................39
13.5.4 Once-only saving of all measuring points...............................39
13.5.5 Cyclic saving of all measuring points......................................40
13.5.6 Memory capacity, memory output and clearing......................40
13.5.7 Scanning configuration...........................................................41
13.5.8 Scan mode.............................................................................41
13.5.9 Starting and stopping measuring operations..........................43
14. SENSO P OG AMMING.....................................................................45
14.1 Selecting the input channel...........................................................45
14.2 Channel designation......................................................................45
14.3 Averaging mode.............................................................................46
14.4 Locking the sensor programming.................................................46
14.5 Limit values.....................................................................................46
14.6 Correction values...........................................................................47
14.7 Scaling, decimal point setting.......................................................47
14.8 Changing the units.........................................................................48
14.9 Selecting the measuring range.....................................................48
14.10 Sensor configuration...................................................................49
14.11 Multi-point calibration..................................................................50
14.12 Special functions..........................................................................50
14.12.1 Cycle factor..........................................................................50
14.12.2 Actions triggered by limit value infringement.........................51
14.12.3 Analog output start / end......................................................52
4 ALM MO® 204

Table of contents
14.12.4 Minimum sensor supply voltage...........................................52
14.12.5 Output function.....................................................................52
14.12.6 Reference channels..............................................................53
14.12.7 lement flags........................................................................53
15. DEVICE CONFIGU ATION.....................................................................54
15.1 Date and time-of-day......................................................................54
15.2 Device designation.........................................................................54
15.3 Language........................................................................................54
15.4 Illumination and Contrast..............................................................54
15.5 Interface, device address and networking...................................55
15.6 Baud rate, data format...................................................................55
15.7 Process control..............................................................................56
15.7.1 Sampling rate.........................................................................56
15.7.2 Scan cycle..............................................................................56
15.7.3 Output cycle...........................................................................57
15.8 Hysteresis....................................................................................... 57
15.9 Operating parameters....................................................................57
16. OUTPUT MODULES................................................................................58
16.1 Data cable.......................................................................................58
16.2 elay trigger modules....................................................................58
16.3 Analog outputs...............................................................................60
17. T OUBLE-SHOOTING............................................................................62
18. DECLA ATION OF CONFO MITY........................................................63
19. ......................................................................................................... ANNEX
64
19.1 Technical data................................................................................64
19.2 Product overview...........................................................................64
19.3 Index................................................................................................ 66
19.4 Your contact partner......................................................................70
ALM MO® 204 5

3. General
3. GENE AL
Congratulations on your purchase of this special ALM MO® measuring instru-
ment from our latest V7 generation. Please note that this device is designed
exclusively for use with standard digital sensors (DIGI, Freq, Inp) and the new
D6 and D7 series. Thanks to the patented ALM MO® plug the device config-
ures itself automatically and thanks to the menus and context-sensitive help
windows its operation should be fairly straightforward. The device can, how-
ever, be used with a wide range of sensors and peripherals and offers many
different special functions. You are advised to take the time to carefully read
these operating instructions and the relevant sections in the ALM MO® Manual
and to properly familiarize yourself with the way the new D7 sensors function
and with the extended range of features the V7 device can now provide. This
is the best way to avoid operating and measuring errors and prevent damage
to the device. To help you find answers to your questions as quickly and easily
as possible a comprehensive index is provided at the end of these instructions
and at the end of the Manual.
3.1 Warranty
ach and every device, before leaving our factory, undergoes numerous qual-
ity tests. We provide a manufacturer's guarantee, lasting two years from deliv-
ery date, that your device will function trouble-free. Before returning your de-
vice to us, please observe the advisory notes in Chapter 18, 'Trouble shooting'.
In the unlikely event that a device does prove defective and you need to return
it, please wherever possible use the original packaging materials for dispatch
and enclose a clear and informative description of the fault and of the condi-
tions in which it occurs.
This manufacturer's guarantee will not apply in the following circumstances:
Any form of unauthorized tampering or alteration inside the device
Use of the device in environments or conditions for which it is not suited
Use of the device with an unsuitable power supply and / or in conjunction
with unsuitable peripheral equipment
Use of the device for any purpose other than that for which it is intended
Damage caused by electrostatic discharge or lightning
Failure to properly observe these operating instructions
The manufacturer reserves the right to change the product's characteristics in
the light of technical progress or to benefit from the introduction of new compo-
nents.
6 ALM MO® 204

Standard delivery
3.2 Standard delivery
When you unpack the device please check carefully for any signs of transport
damage and ensure that delivery is complete.
- Measuring instrument ALM MO® 204 with three AA alkaline batteries
- These operating instructions
- ALM MO® Manual
- CD with ALM MO® Control software and various useful accessories
In the event of transport damage please retain the packaging material and in-
form your supplier immediately.
3.3 Waste disposal
The pictogram showing a waste bin crossed through
means that the product is subject to uropean Union regu-
lations covering segregated waste disposal. This applies
both to the product itself and to any accessories marked
with the same symbol. Disposal of any such item as un-
sorted domestic waste is strictly forbidden.
•Please dispose of all packaging materials in accordance with the applicable
national waste management regulations.
•Please dispose of cardboard boxes, protective plastic packaging materials,
and all preservative substances separately and in the proper manner.
•The disposal of the device itself (also of device parts, accessories, and con-
sumables) is subject to the applicable national and local waste management
regulations and to the environmental protection legislation in force in the
country of use.
•Please dispose of all waste in the proper manner;
this applies in particular to all parts and substances that constitute a hazard
for the environment. This includes inter alia plastics, batteries, and recharge-
able battery packs.
•For the dispatch of such goods please wherever possible use the original
packaging materials.
ALM MO® 204 7

4. Safety instructions
4. SAFETY INST UCTIONS
DANGE Danger to life and limb, risk of damage to equipment
Before starting to operate the device, please read the in-
structions carefully.
Please ensure that you comply with all general safety ad-
vice and the special safety instructions included in other
chapters
Such risks may occur in the following circumstances:
- Failure to heed the operating instructions and all the safety
notes these contain
- Any form of unauthorized tampering or alteration inside the
device
- Use of the device in environments or conditions for which it is
not suited
- Use of the device with an unsuitable power supply and / or in
conjunction with unsuitable peripheral equipment
- Use of the device for any purpose other than that for which it
is intended
- Damage caused by electrostatic discharge or lightning.
DANGE isk of fatal injury through exposure to dangerously high voltage
Such risks may occur in the following circumstances:
Use of the device with an unsuitable power supply and / or in
conjunction with unsuitable peripheral equipment
- Damage caused by electrostatic discharge or lightning
- Do not run sensor lines in the vicinity of high-voltage power
cables.
- Before you touch any sensor lines, ensure that all static elec-
tricity has been discharged.
DANGE Warning - explosive atmospheres or substances
In the vicinity of various fuels or chemicals there is a risk of ex-
plosion.
Do not use the device in the vicinity of blasting work or filling
stations.
8 ALM MO® 204

Special notes on use
4.1 Special notes on use
•If the device is brought into the work-room from a cold environment
there is a risk that condensation might form on the electronics. In mea-
suring operations involving thermocouples pronounced changes in
temperature may cause substantial measuring errors. You are advised
therefore, before starting to use the device, to wait until it has adjusted
to the ambient temperature.
•Before using the mains adapter make sure that the mains voltage is
suitable.
•Be sure to observe the maximum load capacity of the sensor power
supply.
•Sensors with their own integrated power supply are not electrically iso-
lated from one another.
4.2 Handling batteries / rechargeable batteries correctly
When inserting batteries / rechargeable batteries ensure that the
polarity is correct.
If the device will probably not be needed for a relatively long pe-
riod of time or if the batteries are empty, the batteries should be
removed; this will prevent battery acid leaking onto the device
and damaging it.
Rechargeable batteries should be recharged as and when nec-
essary.
You should never attempt to recharge an ordinary (non-
rechargeable) battery; it may explode.
Batteries / rechargeable batteries must never be short-circuited
or thrown onto the fire.
Batteries and rechargeable batteries are special waste and must
not be discarded as normal domestic waste.
ALM MO® 204 9

5. Introduction
5. INT ODUCTION
The ALM MO
®
204 is a new member in our family of unique measuring devices
- all equipped with Ahlborn's patented ALM MO
®
plug system. The intelligent
ALM MO
®
plug system - successfully tried and tested for over 20 years - offers
decisive advantages when connecting sensors and peripherals; since all param-
eters are stored in an PROM located on the connector itself, there is no need
to repeat programming. Any sensor or output module can be connected to any
ALM MO
®
measuring instrument - all in the same way.
Intelligent digital ALM MO
®
sensors of the new D7 generation operating in con-
junction with our V7 measuring instruments overcome any lingering limitations
that may previously have affected the system - with the one exception that they
will not function on old V6 devices. These sensors, irrespective of the device's
quantities and ranges, operate as an autonomous measuring system with up to
10 channels covering completely new measurable variables, with all relevant
control functions, calculation functions, or compensation values, and ranges up
to 8 digits in size and at speeds of up to 1000 measuring operations per second
(mops). What is so special about this new generation is that, thanks to individ-
ual sampling rates, both quick and slower but high-resolution variables can now
very easily be measured and recorded together. Individual sensor functions can
be parametrized via a menu stored in the plug itself. To facilitate identification
the quantity abbreviations and units have been extended to 6 digits and channel
designation to 20 characters. This device has been specially conceived and de-
signed for digital sensors only. It can only be used therefore with digital stan-
dard sensors (DIGI, Freq, Inp) and with all new D6 and D7 sensors. What is
completely new on V7 devices is the channel numbering system. Sensors and
sockets are counted from 0 to 9; this is followed, after a decimal point, by the
channels, likewise counted from 0 to 9; i.e. the first sensor has channels 0.0 to
0.9, the second has 1.0 to 1.9, etc.
Programming and functioning are virtually identical for all units. The following
points apply to all devices in the ALM MO® measuring system; these are de-
scribed in detail in the ALM MO® Manual which is included in delivery with
each device:
- Detailed explanation of the ALM MO® system (Man., Chapt. 1)
- Overview of the device functions and measuring ranges (Man., Chapt. 2)
- Basic principles, operating instructions, and technical data for all sensors
(Man., Chapt. 3)
- Options for connecting your own existing sensors (Man., Chapt. 4)
- All analog and digital output modules (Man., Section 5.1)
- Interface modules RS232, USB, thernet, optic fiber (Man., Section 5.2)
- The whole ALM MO® networking system (Man., Section 5.3)
- All functions and their operation via the interface (Man., Chapt. 6)
10 ALM MO® 204

Introduction
- Complete list of interface commands with all the printouts (Man., Chapt. 7)
- The new V7 commands are described in a special V7 Manual supplementh.
The operating instructions you are now reading cover only those features and
controls that are specific to this device. Many sections refer to more detailed
descriptions in the Manual. (Manual. Section x.x.x).
5.1 Functions of the ALMEMO® 204
ALM MO® 204 measuring instruments have four measuring inputs - suitable
only - as previously stated - for digital ALM MO® sensors. The measuring
possibilities opened up by the new D6 and D7 series of digital sensors are vir-
tually endless. The device can be operated via its integrated softkey keypad
with cursor block and its LCD graphics display. The display can be adapted
via configurable sensor-specific menus to suit all applications. With the internal
8 megabyte memory or with connected memory plug (SD card) a data logger
function is realized. There are two output sockets which can be used to con-
nect ALM MO® output modules, plug-in memory, analog output, digital inter-
face, trigger input, or alarm contacts. Multiple devices can be networked to-
gether by simply connecting them via network cablen.
5.1.1 Sensor programming
The measuring channels are programmed, completely and automatically, via the
ALM MO® plugs. However, the user can easily supplement or modify this pro-
gramming via the keypad or via the interface.
Measuring ranges
Although this device is limited to use with purely digital sensors it does provide
an elegant solution for numerous applications involving more complex sensors.
Sensors are already available for e.g. temperature (NTC, Pt100), all humidity
functions (dewpoint, mixture ratio, vapor pressure, enthalpy), atmospheric
pressure, flow (rotating vanes, hot-wire thermoanemometers), pressure and
force, current and voltage, also infra-red sensors, CO2 and conductivity probes,
color temperature sensors, GPS receivers, and even a fully functioning
weather station. Adding to the number of suitable digital sensors is not a prob-
lem because it is now no longer necessary (as it was previously) to adapt the
measuring instrument accordingly. ach and every sensor is configured via
its own internal sensor menu.
Function channels
Maximum, minimum, and differential values of certain measuring points can be
programmed as function channels and can be processed and printed out like
normal measuring points.
Units
The units display (V5 two characters, D7 up to six characters) can be adapted
for each measuring channel in such a way that both the display and the print-
out always indicate the correct units, e.g. when a transmitter is connected.
ALM MO® 204 11

5. Introduction
Conversion between °C (Centigrade) and °F (Fahrenheit) is performed auto-
matically.
Measured value designation
To help identify sensors an alphanumeric designation is also provided (V5 10
characters, D7 up to 20 characters). This designation appears in each mea-
sured value display, in the printout, or on the computer screenm.
Correction of measured values
The measured value on each measuring channel can be corrected both in
terms of zero-point and gain; this means that even sensors usually requiring
initial adjustment (e.g. expansion, force, pH) can be interchanged freely. Zero-
point correction and, partly at least, gain adjustment can be performed at the
touch of a button. Sensors with multi-point calibration can also be connected.
(see Manual 6.3.13).
Scaling
The corrected measured value on each measuring channel can also be further
scaled in terms of zero-point and gain based on the base value and factor. The
decimal point position can be set by means of the ' xponent' function. Scaling
values can be calculated automatically by setting to zero and entering the nomi-
nal setpoint or via the scaling menu.
Limit values and alarm
Per measuring channel two limit values can be set (one maximum and one
minimum). In the event of one of these limit values being infringed an alarm
signal is output and relay output modules actuate the associated alarm con-
tacts; these can be allocated individually to specific limit values. Hysteresis is
set by default to 10 digits; however, this can be adjusted to any value between
0 and 99 digits.
Sensor locking
All sensor data stored in the PROM in the plug can be protected - by means
of a graduated locking function - against undesired access.
5.1.2 Measuring operation
For standard sensors up to four measuring channels are available; i.e. it is thus
also possible to evaluate double sensors, individually scaled sensors, and sen-
sors with function channels. All activated standard measuring channels are
scanned continuously at the sampling rate and the data acquired is shown in
the display. A D7 sensor has up to 10 channels and a sampling rate corre-
sponding to its own individual measuring speed; this sampling rate can be ap-
plied individually over the new scan cycle.
Measured values
The display can show measured values either (in various menus, some user-
configurable) in two font sizes - or (in one of the user menus) in the form of a
bar chart. Measured values are acquired automatically with auto-zero and self-
calibration; however, they can also be corrected and scaled as and whenever
required. With most sensors a sensor breakage is detected automatically.
12 ALM MO® 204

Functions of the ALM MO® 204
Analog output and scaling
ach measuring point can be scaled by means of analog start and analog end
in such a way that the measuring range thus defined covers the full range of
the bar chart or of an analog output (2 V, 10 V, or 20 mA). At the analog output
the device can output the measured value from any measuring point or a pro-
grammed value.
Measuring functions
To achieve optimal measured value acquisition some sensors require certain
special measuring functions. The new intelligent sensors perform atmospheric
pressure compensation and temperature compensation internally and automat-
ically. With infra-red sensors the emissivity factor can be configured and set.
Measured value smoothing
Measured values of an unstable, fluctuating nature can be smoothed by taking
a sliding average over a number of values programmable from 2 to 99. The
averaging period will depend on the sampling rate and the number of active
channels. However, most D6 and D7 sensors are assigned their own averag-
ing period for all primary channels; this can be set via the sensor menu.
Maximum and minimum values
For each measuring operation the maximum value and minimum value are ac-
quired and saved to memory. These values can then be displayed, output, or
deleted from memory.
Average value
Manual averaging is available per channel over a particular period or cycle or
over a series of individual measuring operations.
Measured value memory
Up to 10 measured values can be saved manually. This data can then be
shown on the display or output via the interface.
5.1.3 Process control
To record the measured values from the connected sensors in digital form
measuring channel scanning must be performed continuously with measured
value output according to a time-based process control. A measuring opera-
tion can be started and stopped by means of the interface, an external trigger
signal, the real-time clock, or by a specified limit value infringement. The stan-
dard cycle, settable from 1 second up, ensures an even cyclic output. If a
higher speed is required, standard sensor values can be scanned and output
at the sampling rate; however, all sensors can now use the new scan cycle;
this, if set to minimum time, obtains measured values from each channel indi-
vidually according to its own actual measuring duration.
Date and time-of-day
ach measuring operation can be accurately logged using the real-time clock
in terms either of date and time-of-day or purely by actual measuring duration.
For the purposes of starting / stopping a measuring operation, the start / stop
date and time-of-day can be programmed via the interface.
ALM MO® 204 13

5. Introduction
Output cycle
The output cycle can be programmed to any value from 1 second to 24 hours.
This function permits cyclic output of measured values to the interface or to the
memory and provides cyclic calculation of the average value.
Cycle factor
The cycle factor can be used to restrict data output from certain channels; this
may prove necessary in order to reduce excessive data flow especially while
measured data is being saved.
Averaging over measuring point scans
The measured values from measuring point scans can be averaged either over
the whole fixed measuring period or over the specified cycle. These average
values can then be output and saved on a cyclic basis to function channels
provided for this purpose.
Sampling rate
All standard digital channels (DIGI and D6) are scanned continuously at the set
sampling rate of 10 measuring operations per second (mops). This rate can
also be programmed to 2.5 mops.
Scan cycle
With the ALM MO® 204 there is also the superordinate scan cycle, which ac-
quires all standard channels and D7 channels whenever one of these delivers
a new current measured value. Recording can be accelerated if measured val-
ues thus acquired are output via the interface and / or to a plug-in memory im-
mediately.
Measured value memory
With the ALM MO® 204 data logger, all measured values can be stored manu-
ally or automatically in a cycle in an PROM. The standard storage capacity
is 8 Megabyte, sufficient for up to 400,000 measured values. The memory or-
ganization can be set as linear or ring memory. Output is via the interface. A
selection by time section or number is possible.
All devices in the ALM MO® 204 series can, by fitting an external plug-in mem-
ory and micro-SD card, be upgraded to a high-capacity data logger. Using this
external memory (available as an accessory) files can be read out very quickly
via any standard card reader.
Control ports
A relay trigger analog adapter can be used to provide up to ten output relays,
and, as option, up to four analog outputs and two trigger inputs.
14 ALM MO® 204

Functions of the ALM MO® 204
Operation
All measured values and function values can be displayed in different menus
on the dot-matrix LCD screen. User menus can be individually configured for
your specific applications from a range of nearly 50 functions, texts, lines, and
empty lines. There are six keys (four of them softkeys) for operating the de-
vice. These can also be used to fully program the device, sensors, and
process control.
Output
All data logs, menu functions, saved measured values, and stored program pa-
rameters can be output to any peripheral equipment. Using the appropriate in-
terface cable any of interfaces RS232, USB, or thernet can be used. To ac-
commodate the variable data quantities the interface protocol has been
changed so that data is now output in table format only; this can then as re-
quired be processed directly using any standard spreadsheet program.
Networking
All ALM MO® devices can be individually addressed and can be networked to-
gether by simply linking them up via network cable. However, old V5 / V6 de -
vices and the new V7 devices use different protocols and must therefore be
operated via different COM ports.
Software
ach ALM MO® Manual is accompanied by the ALM MO-Control software
package, which can be used to configure the measuring instrument and user
menus, to program the sensors, and to read out from the measured value
memory. Using the integrated terminal, measuring operations can also be per-
formed online. The WINDOWS® software package Win-Control is provided for
measured value acquisition from networked devices, for graphical presenta-
tion, and for more complex data processing.
ALM MO® 204 15

6. Putting into service
6. PUTTING INTO SE VICE
Sensor connection Connect sensors to sockets M0 to M1 (1) s. 8.
Power supply via batteries or mains adapter at socket DC (3) s. 7.1, 7.2
To switch ON Press ON / PROG (5) once and release s. 7.5
Automatic display of last measuring menu s. 11.
For menu selection
press key: <MENU>
On / off display illumination: <ON> / <OFF>
Select sensor list s. 9.1 menu <F> : ▲ / ▼ ...
Call up a menu: ► o . PROG
Select a sensor (s. 10) ▲ / ▼ ...
Display sensor: <M ◄◄ >
Select a measuring channel (s. 11.1.1)
<M> : ▲ / ▼ ...
All channels on the connector or those functions needed
for measured value calculation are displayed.
Data logger functions: (s. 11.4)
Select Menu U2 data logger : <MENU> , ▼.., ►
Select memory cycle PROG , ▲ / ▼ ...
Using the scan cycle:
For V6 set 'scan time': <SCANT>
For D7 set 'minimum time': <MIN>
Return to output cycle (00:01:00): <RESET>
nter the cycle (s. 9.5): PROG , ▲ / ▼ , ► ..
Terminate programming mode: < ESC>
Start / stop measuring: <START> - <STOP>
Output via an interface to a printer or computer:
- Connect peripheral equipment via data cable to socket A1 (2) s. Man. 5.2
Select free memory : PROG , ▼ ...
Output memory s. 14.5.6 < PMEM> o command ´P04´ f om the compute
Delete memory content s. 14.5.6 < CMEM > o command ´C04´ f om the compute
16 ALM MO® 204

Power supply
7. POWE SUPPLY
Power can be supplied to the measuring instrument in any of the following
ways :
Three AA alkaline batteries (included in delivery)
Mains adapter, 12 V, 2 A, with ALM MO® plug ZA1312-NA10
Power supply cable, electr. isolated 10 to 30 VDC, 0.25 A ZA2690-UK
USB data / power cable 9 V, 0.2 A ZA1919-DKU5
Our product spectrum covers all the appropriate accessories.
7.1 Battery operation and supply voltage monitoring
The device is normally powered by three AA alkaline batteries. At a current
consumption of on average 30 mA, these should last for an operating time of
approx. 100 hours. However, if the display illumination is left switched on, this
will be reduced to approx. 50 hours. Since this device operates exclusively
with active sensors, their current consumption must also be considered. The
current operating voltage can be checked in the Info menu; this gives you a
basis for estimating the remaining operating time. (s. 10) As soon as the re-
maining battery capacity drops to approx. 10 %, the battery symbol ´´µµµµµµµµµ¶ will
appear in the status bar or softkey bar of the display and start to flash. If the
batteries discharge completely, the device will switch off automatically as soon
as battery capacity drops to approx. 3 V; any parameters set will be saved. (s.
7.6) To replace used batteries first switch the device off and then unscrew the
cover of the battery compartment located on the rear of the device. (6) When
inserting fresh batteries ensure that their polarity is correct.
7.2 Mains operation
To power this device from an external source preferably use mains adapter
ZA-1312-NA10 (12 V / 2 A); connect this to the DC socket. (3) Please ensure
that the mains voltage is correct. The sensor voltage rises to approx. 12 V.
7.3 External DC voltage supply
The DC socket can also be used to connect another DC voltage, 6 to 13 V
(minimum 200 mA). (3) It can be connected using ALM MO® plug ZA-1312-
FS8. If, however, the power supply has to be electrically isolated from the
transducers or if a larger input voltage range (10 to 30 V) is required, then elec-
trically isolated supply cable ZA-2690-UK must be used. It will then be possi-
ble to use the measuring instrument in a 12-volt or 24-volt on-board supply
system. A practical alternative is USB data / power cable ZA-1919-DKU5; this
provides simultaneously a data interface to the computer and power supply.
(not electrically isolated)
ALM MO® 204 17

7. Power supply
7.4 Sensor supply
At the terminals + (plus) and - (minus) in the ALM MO® plug there is a sensor
supply voltage of 6 / 9 / 12 V (self-healing fuse, total current 500 mA); this is
set automatically depending on the minimum sensor supply. With a 12 V sup-
ply the sensor supply voltage will generally also increase to 12 V.
7.5 Switching ON / OFF, reinitialization
To switch the device ON press and release ON PROGr located in the middle of
the cursor block. (5) The measuring menu most recently selected always ap-
pears in the display first. To switch OFF press and hold down the same key(s)
ON PROGr . After the device is switched off the real-time clock continues to run
and all saved values and settings are retained intact. (s. 7.6) If interference
(e.g. electrostatic, battery failure) causes the device to behave abnormally, it
can be reinitialized. To activate a reset press and hold down key F1 r when
switching on. To return all device programming (including device designation,
user menus, process control, etc.) to the factory default settings press and hold
down key F2 r when switching on. In so doing certain parameters will be lost or
returned to their defaults : Language: German, Illumination: OFF, Device ad-
dress: 00, Hysteresis: 10, Sampling rate: 10 mops.
Sensor programming in the ALM MO® plugs will remain unaffected.
7.6 Data buffering
The sensor's programming is stored in the PROM on the sensor plug; the
device's calibration values and programmed parameters are stored in the P-
ROM on the instrument itself; in the event of failure both will be retained intact.
Date and time-of-day settings and the individual value memory are retained in-
tact if the device is just switched off or when the batteries are changed - so
long as the batteries have a voltage of approx. 2.7 V.
8. CONNECTING SENSO S / T ANSDUCE S
Only digital ALM MO® sensors can be connected at input sockets M0 and M3
(1) on measuring instrument ALM MO® 204, i.e. only standard sensors with
DIGI, Freq, or Inp, and all new D6 and D7 sensors. All standard sensors with
an ALM MO® plug usually have the measuring range and units already pro-
grammed and can thus be connected to any input socket without further adjust-
ment. A mechanical coding system ensures that sensors and output modules
can only be connected to the correct sockets. All ALM MO® plugs incorporate
two snap-lock levers; these snap into position as soon as the plug is inserted
into the socket, thus preventing unintended disconnection if the cable is pulled
accidentally. To withdraw the plug both these levers must first be pressed in at
the sides.
18 ALM MO® 204

Standard sensor (V5)
8.1 Standard sensor (V5)
ALM MO
®
V5 sensors are housed in a light-gray case. The source of their intel-
ligence is an 2-KB PROM integrated in the sensor plug, in which all channel
settings are stored; the device is thus programmed completely as soon as such
a sensor is connected. With the newer V6 version incorporating a 4-KB P-
ROM ( 4) multi-point calibration can be performed on the sensor. Digital sen-
sors used for the quantities - frequency, pulse, or DIGI - incorporate a microcon-
troller, which transfers digital signals to the device via an I2C bus. Measured
values are processed in synchrony with the sampling rate and at a resolution of
maximum ±65000 all in the device.
8.2 D6 sensors
ALM MO® D6 sensors are housed in a partly light-gray, partly dark-gray case;
they are completely autonomous measuring modules not only for digital but also
for analog sensors; they can, independently of the device, handle new measur-
ing ranges with special measured value processing and various forms of com-
pensation. As regards measured value processing D6 sensors are fully compati-
ble with standard sensors - except for multi-point calibration and smoothing;
however, on this V7 device, quantity configuration and parametrization can be
performed via the 'Sensor configuration' menu or using a USB adapter cable di-
rectly on the PC (s. 15.10).
8.3 D7 sensors
ALM MO® D7 sensors are housed in a dark-red case; they too are completely
autonomous measuring modules for digital and for analog sensors - but offer
substantially enhanced properties. The sampling rate can be set from 1 mil-
lisecond up to several minutes with a resolution up to 8 digits. The number of
channels has, thanks to a new numbering scheme, been extended up to 10 per
sensor and up to 10000 per device. Channel designations can be up to 20
characters and units up to six characters in length. With D7 sensors up to four
primary channels can also be smoothed at the same time internally over the
averaging period. For the purpose of setting individual parameters (e.g. quan-
tities, averaging period) a special menu ´Sensor configuration´ is provided by
the sensor itself. (s. 15.10) All measured value processing is performed in the
sensor itself; the resulting data is transferred no longer via an I2C bus but via a
serial interface to the device. For this reason and because of the expanded
data format D7 sensors can only be operated in conjunction with a V7 device
or directly on a PC.
ALM MO® 204 19

8. Connecting sensors / transducers
8.4 Measuring inputs und additional channels
Measuring instrument ALM MO® 204 incorporates four input sockets M0 and
M3; to these, under the new channel numbering scheme, measuring channels
M0.0 to M3.0 are initially assigned. (1) Whereas standard sensors can if nec-
essary provide up to four channels (M0.0 to M0.3, M1.0 to M1.3, etc.), D7 sen-
sors can provide up to 10 (M0.0 to M0.9, M1.0 to M1.9, etc.). The additional
channels can be used in particular for humidity sensors with all the humidity
variables (temperature / humidity / dewpoint / mixture ratio) or for function
channels. ach sensor can if necessary be programmed with several quanti-
ties or scaling settings; and two or three sensors, if pin assignment so permits,
can be combined in a single plug. This device does not incorporate any internal
channels. On the measuring instrument this gives the following channel assign-
ment:
8.5 Potential separation
Since the digital sensors are all operated via the common sensor power sup-
ply, they are all electrically interconnected. So long as the sensors are them-
selves isolated or are operated in isolation, this is not a problem. However, if
two electrical signals (current, voltage) are used, adapter cable ZA-D700-GT
can be connected between them to ensure electrical isolation for power supply
and data lines.
The power supply is isolated by the transformer in the mains adapter or by a
DC/DC converter in connecting cable ZA-2690-UK. Data and trigger cables are
equipped with optocouplers. If analog output cables are not electrically isolated
the recording device or the sensors must be zero-potential.
20 ALM MO® 204
M0 M1
0.0
0.1
0.2
0.3
1.0
1.1
1.2
1.3
1. Chan
2. Chan
3. Chan
4. Chan
Sensor channels
with new channel numbering
V5/D6-sensors D7-sensors
5. Chan.
10. Chan.
... 1.4
1.9
...
M2 M3