Ahlborn ALMEMO 809 User manual

____________________________
Operating instructions
Measured data acquisition module
ALMEMO® 809
V1.2
10.11.15
www.ahlborn.com

1. Operating controls
1. OPERAT NG CONTROLS
(1) Code switches
G: Device address 00 to 99
(2) Key ON / OFF, START / STOP
ON ON
START Start the meas. operation
STOP Stop the meas. operation
OFF O , hold key pressed down
(3) Status LEDs
ON Device is switched ON
START Meas. op. has started
REC Meas. with results saved
COM Measuring with output
ALARM Limit value infringement
Sensor breakage, battery low
(4) Measuring sockets M0 to M8
M0...M8 for V5/V6/D6/D7 sensors
M0.1...M8.9 max. 81 channels
(5) Output sockets A1, A2
A1 USB interface (ZA1919-DKU)
RS232/optic fiber (ZA1909-DK5/DKL)
RS 422 (ZA 5099-NVL/NVB)
Ethernet (ZA 1945-DK)
Bluetooth (ZA 1719-BPVU)
Trigger input (ZA 1000-ET/EK)
Relay outputs (ZA 1000-EGK)
Analog output 1 (ZA 1601-RK)
A2 Network cable (ZA1999-NK5/NKL)
SD card connector (ZA1904-SD)
Trigger input (ZA 1000-ET/EK)
Relay outputs (ZA 1000-EGK)
Analog output 2 (ZA 1601-RK)
(6) Ground socket
(7) DC supply socket 12V
Mains adapter (ZB 1212-NA7, 12V, 1A)
Cable electrically isolated
(ZB 3090-UK, 10-30V)
2 ALMEMO® 809

Table of Contents
2. TABLE OF CONTENTS
1. OPERAT NG CONTROLS..........................................................................2
3. GENERAL................................................................................................... 5
3.1 Warranty...............................................................................................5
3.2 Standard delivery................................................................................6
3.3 Waste disposal....................................................................................6
4. SAFETY NSTRUCT ONS..........................................................................7
4.1 Special notes on use...........................................................................8
5. NTRODUCT ON.........................................................................................8
5.1 Functions of the ALMEMO 809...........................................................9
5.1.1 Sensor programming..................................................................10
5.1.2 Measuring operation...................................................................11
5.1.3 Process control...........................................................................12
6. PUTT NG NTO SERV CE........................................................................15
7. POWER SUPPLY.....................................................................................16
7.1 Mains operation.................................................................................16
7.2 External DC voltage supply..............................................................16
7.3 Sensor supply....................................................................................16
7.4 Switching ON / OFF, reinitialization.................................................16
7.5 Data buffering....................................................................................17
8. CONNECT NG SENSORS / TRANSDUCERS..........................................17
8.1 Standard sensors (V5,V6).................................................................17
8.2 D6 sensors.........................................................................................18
8.3 D7 sensors.........................................................................................18
8.4 Measuring inputs , additional channels..........................................19
8.5 Potential separation..........................................................................19
9. OPERAT ON AND CONF GURAT ON.....................................................21
9.1 Combination key...............................................................................21
9.2 Status LEDs....................................................................................... 21
9.3 Device address and networking.......................................................21
9.4 Configuration, new V7 functions.....................................................22
10. MEASURED DATA ACQU S T ON..........................................................23
10.1 Online measurement with PC.........................................................23
10.2 Offline measurement.......................................................................24
10.2.1 Sleep mode..............................................................................24
10.2.2 Measured value memory, internal............................................25
10.2.3 Memory connector with SD memory card.................................25
11. SPEC AL MEASURED QUANT T ES, L NEAR ZAT ON, MULT -PO NT
CAL BRAT ON................................................................................................26
12. TROUBLE-SHOOT NG.............................................................................27
13. ELECTROMAGNET C COMPAT B L TY.................................................28
ALMEMO® 809 3

2. Table of Contents
14. ANNEX...................................................................................................... 29
14.1 Technical data.................................................................................29
14.2 ndex.................................................................................................30
14.3 Your contact partner.......................................................................32
4 ALMEMO® 809

General
3. GENERAL
Congratulations on your purchase of this latest V7-generation ALMEMO® mea-
sured data acquisition module. Thanks to the patented ALMEMO® connector
and the new digital D7 sensors the device configures itself automatically and
thanks to the supplied ALMEMO® Control software its operation should be fairly
straightforward. The device can, however, be used with a wide range of sen-
sors and peripherals and offers many different special functions. You are advi-
sed to take the time to carefully read these operating instructions and the rele-
vant sections in the ALMEMO® Manual and to properly familiarize yourself with
the way these new sensors function and with the range of features the V7 de-
vice now provides. This is the best way to avoid operating and measuring er-
rors 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
Each and every device, before leaving our factory, undergoes numerous quali-
ty tests. We provide a guarantee, lasting two years from delivery date, that
your device will function trouble-free. Before returning your device to us, please
observe the advisory notes in Chapter 12, 'Trouble shooting'. In the unlikely
event that a device does prove defective and you need to return it, please whe-
rever possible use the original packaging materials for dispatch and enclose a
clear and informative description of the fault and of the conditions in which it
occurs.
This 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
● ailure 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 com-
ponents.
ALMEMO® 809 5

3. General
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 ALMEMO® 809
Mains adapter
These operating instructions
ALMEMO® Manual
CD with ALMEMO® 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 European 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 unsor-
ted 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.
•or the dispatch of such goods please wherever possible use the original pa-
ckaging materials.
6 ALMEMO® 809

Safety instructions
4. SAFETY NSTRUCT ONS
DANGER 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 advi-
ce and the special safety instructions included in other
chapters.
Such risks may occur in the following circumstances:
•ailure 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.
DANGER Risk 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
electricity has been discharged.
DANGER 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.
ALMEMO® 809 7

4. Safety instructions
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 measuring opera-
tions involving thermocouples pronounced changes in temperature may
cause substantial measuring errors. You are advised therefore, before star-
ting to use the device, to wait until it has adjusted to the ambient tempera-
ture.
● Before using the mains adapter make sure that the mains voltage is suita-
ble.
● Be sure to observe the maximum load capacity of the sensor power supply.
● Sensors with their own integrated power supply are not electrically isolated
from one another.
● Do not run sensor lines in the vicinity of high-voltage power cables.
● Before you touch any sensor lines, ensure that all static electricity has been
discharged.
5. NTRODUCT ON
The V7 measured data acquisition module ALMEMO® 809 is a brand new
member in our family of unique measuring instruments - all equipped with Ahl-
born's patented ALMEMO® plug system. The ALMEMO® plug offers - and has
offered for the last 20 years - decisive advantages when connecting sensors
and peripherals because all parameters are stored in an EEPROM located on
the connector itself; repeated programming is thus no longer necessary. Any
sensor or output module can be connected to any ALMEMO® measuring instru-
ment - all in the same way.
However, the new generation of intelligent digital ALMEMO® D7 sensors, ope-
rating in conjunction with our V7 measuring instruments, overcomes all limitati-
ons to which the system was previously subject. Each such sensor, irrespecti-
ve of the device's measuring quantities and ranges, can operate as an autono-
mous measuring system with up to 10 channels and provide completely new
measurable variables with all necessary control functions, calculating functi-
ons, or compensation values, with a range of values up to 8 digits and at
speeds up to 1 kHz. What is so special about this new generation is that,
thanks to the individual sampling rates used, high-resolution variables, both
quick and slow, can now very easily be measured and recorded together. Indi-
vidual 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 the measuring point comments to 20 characters. All sensors
belonging to the preceding V6 generations can be used on V7 devices but the
new D7 sensors are not backwardly compatible with V6 devices. However,
they can be operated directly on the PC via the serial interface and an adapter
8 ALMEMO® 809

Introduction
cable. What is completely new with the V7 generation is the channel numbe-
ring system. Sensors and sockets are counted from 0 to 9; this is followed by
the channels counted as decimals also 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 ALMEMO® measuring system;
these are described in detail in the ALMEMO® Manual which is included in deli-
very with each device.
De ailed explana ion of he ALMEMO® sys em (Manual, Chap er 1)
Overview of he device func ions and measuring quan i ies and ranges (Manual, Chap er 2)
Basic principles, opera ing ins ruc ions, and echnical da a for all sensors
(Manual, Chap er 3)
Op ions for connec ing your own exis ing sensors (Manual, Chap er 4)
All analog and digi al ou pu modules (Manual, Sec ion 5.1)
In erface modules RS232, op ic fiber, USB, E herne (Manual, Sec ion 5.2)
The whole ALMEMO® ne working sys em (Manual, Sec ion 5.3)
All func ions and heir opera ion via he in erface (Manual, Chap er 6)
Comple e lis of in erface commands wi h all he prin ou s (Manual, Chap er 7)
he 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 809
Measured data acquisition module ALMEMO® 809 is housed in a compact 8-
DU case; it has 9 electrically isolated measuring inputs suitable for all ALME-
MO® sensors. Given the large portfolio of V6 sensors and now the new, inno-
vative D7 sensors measuring possibilities are nowadays virtually limitless.
Thanks to the external memory connector with a micro SD card and the real-
time clock, all incorporated as standard on the ALMEMO® 809, the amount of
data you can record is virtually endless. The ALMEMO® 809 also incorporates
a high-speed 8-MB flash memory sufficient for up to 1.5 million measured valu-
es . There are two output sockets which can be used to connect any of the AL-
MEMO® output modules, e.g. analog output, digital interface, memory connec-
tor, trigger input, or alarm contacts. Multiple V7 devices can be networked to-
gether by simply connecting them via network cable.
5.1.1 Sensor programming
The measuring channels are programmed, completely and automatically, via
the ALMEMO® plugs. However, the user can easily supplement or modify this
programming via the interface.
ALMEMO® 809 9

5. Introduction
Measuring quantities and ranges
Appropriate measuring quantities and ranges are available for all V6 sensors
with a non-linear characteristic, e.g. 10 thermocouple types, NTC and Pt100 pro-
bes, and flow transducers (rotating vanes, hot-wire thermoanemometers, Pitot
tubes). or humidity sensors there are additional function channels available for
calculating humidity variables such as dewpoint, mixture ratio, absolute humidity,
vapor pressure, and enthalpy - now on the basis of the latest formulae as per Dr.
Sonntag. Even complex chemical sensors are supported. Measured values from
other sensors can also be acquired using the voltage, current, and resistance
quantities with individual scaling in the plug itself. Existing sensors can still be
used - so long as the appropriate ALMEMO® plug is connected via its screw ter-
minals. or digital input signals, frequencies, and pulses there are adapter plugs
available with an integrated microcontroller. The new autonomous D7 sensors
already provide this wide range of features but also in the future they herald as
yet unimagined possibilities in data acquisition from both digital and analog sen-
sors and in all manner of data formats. It will even be possible to control the
measuring system itself. It is for example possible to connect an increasing ran-
ge of sensors to the ALMEMO® V7 measuring instrument and to change sensors
without needing to reset.
Function channels
Maximum, minimum, average, and differential values of certain measuring
points can be programmed as function channels and can be processed and
printed out like normal measuring points. There are also function channels
available for special measuring tasks, e.g. to determine thermal coefficient Q/
ΔT and the wet-bulb globe temperature.
Units
The units display (V6 two characters, D7 up to six characters) can be adapted
for each measuring channel in such a way that both the display and the prin-
tout always indicate the correct units, e.g. when a transmitter is connected.
Conversion between °C (Centigrade) and ° ( ahrenheit) is performed auto-
matically.
Measured value designation
To help identify sensors an alphanumeric designation is also provided (V6 10
characters, D7 up to 20 characters). This name is entered via the interface
and will appear in the printout or on the computer display.
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 in-
itial 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.
There is also the possibility of performing multi-point adjustment or user-defi-
ned linearization.
10 ALMEMO® 809

unctions of the ALMEMO 809
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 'Exponent' function. Scaling
values can be calculated automatically by setting to zero and entering the no-
minal setpoint.
Limit values and alarm
Per measuring channel two limit values can be set (one maximum and one mi-
nimum). In the event of one of these limit values being infringed relay output
modules actuate the associated alarm contacts; these can be allocated indivi-
dually 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. A limit value infrin-
gement can also be used to automatically start or stop measured value recor-
ding or via macros to control device functions in any way required.
Sensor locking
All sensor data stored in the EEPROM in the plug can be protected - by means
of a graduated locking function - against undesired access.
5.1.2 Measuring operation
or nine V6 sensors up to 36 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 V6 measuring channels are conti-
nuously scanned at a rate of 10 MOPS (measuring operations per second).
When there are numerous measuring points to consider, the overall response
time can be shortened by increasing the measuring rate up to 100 MOPS. A
D7 sensor has up to 10 channels and a sampling rate corresponding to its own
individual measuring speed.
Measured values
Measured values are acquired automatically with auto-zero and self-calibrati-
on; however, they can also be corrected and scaled individually as required.
With most sensors a sensor breakage is detected automatically.
Analog output and scaling
Each 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 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 programmed value.
Measuring functions
To achieve optimal measured value acquisition some sensors require certain
special measuring functions. Cold junction compensation is provided for ther-
mocouples; temperature compensation is provided for dynamic pressure, pH,
and conductivity probes; and atmospheric pressure compensation is provided
for humidity, dynamic pressure, and O2 sensors.
ALMEMO® 809 11

5. Introduction
Measured value smoothing
With V6 sensors measured values of an unstable, fluctuating nature can be
smoothed by taking a sliding average over a number of values programmable
between 2 and 99. The averaging period will depend on the sampling rate and
the number of active channels. However, D7 sensors are assigned their own
fixed averaging period for all primary channels; this can be set via the sensor
menu.
Maximum and minimum values
Each measuring operation acquires and stores the maximum and minimum
values with date and time-of-day. Each of these values can be output, used as
function channel, or deleted.
Average value
Manual averaging is available per channel over a particular period or cycle or
over a series of individual measuring operations.
5.1.3 Process control
To record the measured values from all connected sensors in digital form mea-
suring point scanning must be performed continuously with measured value
output according to a process scheduling system. This may be per output cycle
or, if rapid results are required, at the measuring rate itself. Data from each D7
sensor is acquired individually per scan cycle; this can be adjusted to suit the
fastest acting sensors, slower acting ones being omitted until new updated
values appear.
A measuring operation can be started and stopped by means of a key, the in-
terface, an external trigger signal, the real-time clock, or by a specified limit va-
lue infringement.
Date and time-of-day
Each 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.
or the purposes of starting / stopping a measuring operation the start / stop
date and time-of-day and / or the actual measuring duration can be program-
med.
Cycle
The output cycle can be programmed to any value between 1 second and 24
hours. This function permits cyclic output of measured values to the interfaces
or to the memory and provides cyclic calculation of the average value.
Cycle factor
The cycle factor can be used to restrict data being output from certain channels
at the output cycle; this may prove necessary in order to reduce excessive
data flow while measured data is being saved. With D7 sensors the individual
scan time already set can be changed to a longer preferred scan time.
Averaging over measuring point scans
The measured values from measuring point scans can be averaged either over
12 ALMEMO® 809

unctions of the ALMEMO 809
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.
Conversion rate
The conversion rates available for V5 / V6 sensors are 2.5 / 10 / 50 / 100
MOPS (measuring operations per second). Recording can be accelerated if all
measured values are stored to memory and / or output via the interface at the
conversion rate. Among D7 sensors there are especially fast models with a
scan time of just 1 millisecond, which permits a sampling rate of 1000 MOPS.
Measured value memory
To save measured values there are two alternative methods. The ALMEMO®
809 incorporates a non-volatile 8-MB flash memory sufficient for up to 1.5 milli-
on measured values . This memory can be organized and configured in either
linear or ring form. Output is via the interface. Selection can be specified accor-
ding to date or number.
Or alternatively an external memory connector fitted with a memory card can
simply be connected at socket A2. This solution, depending on the size of the
card, offers a virtually limitless memory capacity. With an external memory
connector, available as an accessory, files can be read out very quickly via any
standard card reader.
Numbering of measuring operations
By entering a number single scans or entire series of measuring operations
can be identified and selectively read out from memory.
Control outputs
Via the keypad and interface up to ten output relays and up to four analog out-
puts can be individually addressed.
Output
All data logs, all saved measured values, and all programming parameters can
be output to any peripheral equipment. RS232, RS422, USB, and Ethernet in-
terfaces are available via the appropriate interface cables. Wireless communi-
cation is also possible via Bluetooth. To accommodate the variable data quanti-
ties provided by D7 sensors the interface protocol has been changed so that
data is now output in table format only; this can then if so required be proces-
sed directly using any standard spreadsheet program.
Networking
All ALMEMO® 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
Each ALMEMO® Manual is accompanied by the ALMEMO® Control software
package, which can be used to configure the measuring instrument, to pro-
ALMEMO® 809 13

5. Introduction
gram the V6 and D7 sensors, and to read out from the measured value memo-
ry. Using the integrated terminal, measuring operations can also be performed
online. The WINDOWS® software package WinControl is provided for measu-
red value acquisition from networked devices, for graphical presentation, and
for more complex data processing.
14 ALMEMO® 809

Putting into service
6. PUTT NG NTO SERV CE
1. Sensor connection Connect sensors to sockets M0 to M8 (4). see Sec ion 8.
2. Power supply Connect mains adapter to socket DC (7). see Sec ion 7.1
3. Switching ON Press the ON key (2). see Sec ion 7.4
4. Register device on the PC
Connect the computer via interface cable to socket A1. see Man. 5.2
Activate the software, e.g. the supplied ALMEMO® Control. Via <Interface>
set the COM port and transmission rate to 9600 baud. see Man. 6.1.1
Register device via < ind connected devices>.
5. Check sensors and, if necessary, program.
In main menu <Measuring points> select and check <List>.
If so required select channel and <Program measuring point>.
6. Program the device in device list via <Program device>
or automatic measuring point scan enter 'cycle'. see Man. 6.5.2
or quick measuring operation use sampling rate or scan cycle (D7). see 9.4
To save activate 'With memory'.
If so required 'Accept date and time-of-day from PC'. see Man. 6.2.8
7. Measured data acquisition from PC without saving in device
In main menu activate < ile - terminal>. see Man. 6.1.3
Select < ile> - <Terminal> - <Open log> and then enter file name, 'Save'.
Start measuring operation by actuating the 'Start' button or pressing the
START/ STOP key. see Man. 6.6
Stop measuring operation by actuating the 'Stop' button or pressing the
START/ STOP key. Select < ile> - <Terminal> - <Close log>. Call up file e.g.
from MS-Excel and import using ';' as separator. see Man. 6.1.4
8. Saving measured values in the device
In main menu <Devices> activate <Measured value memory>.
If so required click on 'Clear memory' and 'Execute'. see Man. 6.9.3
or long-term recording set scan mode 'Sleep' (cycle > 2 minutes). see 10.2.1
Activate 'Start saving to memory' immediately
or Start measuring operation on site by pressing START/ STOP key
or Enter 'Start date', 'Start time', and 'End date', 'End time'. see Man. 6.6.2
At the end of the measuring operation stop recording by pressing the START/
STOP key.
Transferring data from memory to the computer
If the memory connector is being used withdraw the memory card and using a
USB reading device copy to the PC see Man. 6.9.4.2 or Reconnect the computer
via interface cable to socket A1. see above In ALMEMO® Control call up <De-
vices - Measured value memory>. Click on 'Read out whole memory'.
Read out, 'Execute', enter file name, 'Save'. see Man. 6.9.3
Call up file e.g. from MS-Excel and import using ';' as separator. see Man. 6.1.4.
ALMEMO® 809 15

7. Power supply
7. POWER SUPPLY
Power can be supplied to the measuring instrument in any of the following
ways : Mains adapter 12 V / 1.0 A ZB 1212-NA7
Power supply cable, electr. Isol. (10 to 30 VDC, 0.25 A) ZB 3090-UK
Power supply cable, electr. Isol. (10 to 30 VDC, 1.25 A) ZB 3090-UK2
See product overview, Annex 14 and the following chapters.
7.1 Mains operation
To power these devices from the mains preferably use the mains adapter pro-
vided (for type see above); connect it to the socket DC (7).
7.2 External DC voltage supply
The DC socket (7) can also be used to connect another DC voltage, 9 to 13 V
(minimum 200 mA). or this connection use a cable with 2 banana plugs (ZB
5090-EK). 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
an electrically isolated supply cable must be used (ZB 3090-UK). It will then be
possible to use the measuring instrument in a 12-volt or 24-volt on-board sup-
ply system.
7.3 Sensor supply
An den Klemmen – und + im ALMEMO®-Stecker steht bei Netzbetrieb eine
ühlerversorgungsspannung von 12V (400mA) zur Verfügung (selbstheilende
Sicherung 500 mA). Andere Spannungen (12V, 15V, 24V oder Referenzen für
Potentiometer und Dehnungsmessstreifen) sind mit speziellen Steckern er-
reichbar (s. Hb. 4.2.5/6).
7.4 Switching ON / OFF, reinitialization
To switch the device ON / O press the ON / O key (2).
To switch the device O press the ON / O key and hold down for approx. 1
second. After the device is switched off the real-time clock continues to run
and all saved values and settings are retained intact.
If interference (e.g. electrostatic or mains failure) causes the device to behave
abnormally, you are advised first of all to try clearing the problem by simply rei-
nitializing, i.e. switching off and then on again.
If this does not help then you are advised to restore all device programming to the
factory default settings. The device can be reset by setting the code switch G (1) ,
before switching on, to address 99. The device name, device programming with all
settings, memory and macros are deleted and the baud rate setting in the data ca-
ble is reset to 9600 baud. Only the time, device calibration and programming of the
sensors in the ALMEMO
®
connectors remain unaffected.
16 ALMEMO® 809

Data buffering
7.5 Data buffering
The sensor's programming is stored in the EEPROM on the sensor plug; the
device's calibration and programmed parameters are stored in the EEPROM
on the device itself; both are fail-safe. The memory data is also saved in non-
volatile EEPROMs. Date and time-of-day are buffered by a dedicated lithium
battery; this data is retained intact for years - even when the device is switched
off and without batteries.
8. CONNECT NG SENSORS / TRANSDUCERS
Virtually any ALMEMO® sensor can be connected to any of the input sockets
M0 to M8 on the ALMEMO® measuring instrument (1); (this includes all stan-
dard V5 and V6 sensors and newer D6 and D7 digital sensors). The ALME-
MO® Manual includes detailed descriptions of the comprehensive ALMEMO®
range of sensors (see Manual Ch. 3) and instructions for connecting your own
existing sensors to ALMEMO® instruments (see Manual Ch. 4). To connect
your own existing sensors you simply need the appropriate ALMEMO® plug.
All standard sensors with an ALMEMO® plug usually have the measuring quan-
tity, range, and units already programmed and can thus be connected to any
input socket without further adjustment. A mechanical coding system ensures
that sensors and output modules can only be connected to the correct sockets.
All ALMEMO® plugs incorporate two snap-lock levers; these snap into position
as soon as the plug is inserted into the socket, thus preventing unintended dis-
connection if the cable is pulled accidentally. To withdraw the plug these two
levers must first be pressed in at the sides.
8.1 Standard sensors (V5,V6)
Standard ALMEMO® V6 sensors are housed in a light-gray case. The exclusi-
ve source of their intelligence is a 4-KB EEPROM (E4) integrated in the sensor
plug, in which all channel settings are stored; the device is thus programmed
completely as soon as any such sensor is connected. These sensors also
support multi-point calibration. Older sensors (V5) with an EEPROM of only 2
KB do not yet support this feature. Passive analog sensors are electrically iso-
lated from one another by means of photovoltaic relays; all signals in the de-
vice are converted analog-to-digital.
Digital sensors used for the quantities - frequency, pulse, or DIGI - incorporate
a microcontroller, which transfers digital signals to the device via an I2C bus.
Measured values are processed in synchrony with the conversion rate (maxi-
mum 100 MOPS) and at a resolution of maximum ±65000 all in the device in-
cluding linearization and various forms of compensation.
ALMEMO® 809 17

8. Connecting sensors / transducers
8.2 D6 sensors
ALMEMO® 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
measuring quantities and ranges with special measured value processing and
various forms of compensation. As regards measured value processing D6
sensors are fully compatible with standard sensors - except for multi-point cali-
bration and smoothing; however, quantity and range configuration and parame-
trization must be performed via the special 'Sensor configuration' menu in the
ALMEMO® Control software either on the V7 device itself or, using a USB ad-
apter cable, directly on the PC.
(see additional instructions 'Digital ALMEMO® D6 sensors').
8.3 D7 sensors
ALMEMO® 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 conversion rate can be set from 1 milli-
second 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. or the purpose of setting individual parameters (e.g. quan-
tities and ranges, averaging period) special menu 'Sensor configuration' is pro-
vided by the sensor itself. (see additional instructions 'Digital ALMEMO® D7
sensors') All measured value processing is performed in the sensor itself; the
resulting data is transferred no longer via an I2C bus but via the serial interface
alone. or 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. or
D7 sensors dedicated extension cables and an adapter cable for electrical iso-
lation are available.
18 ALMEMO® 809

Measuring inputs , additional channels
8.4 Measuring inputs , additional channels
Measuring instrument ALMEMO® 809 incorporates nine input sockets M0 to
M8 (1); to these, under the new channel numbering scheme, measuring chan-
nels M0.0 to M8.0 are initially assigned. Whereas standard sensors can if ne-
cessary provide up to four channels (M0.0 to M0.3, M1.0 to M1.3, etc.), D7
sensors can provide up to 10 (M0.0 to M0.9, M1.0 to M1.9, etc.). The additio-
nal channels can be used in particular for humidity sensors with numerous
measurable variables (temperature / humidity / dewpoint / mixture ratio) or for
function channels. Each sensor can if necessary be programmed with several
quantities or scaling settings; and two or three sensors, if pin assignment so al-
lows, can be combined in a single plug (e.g. RH / NTC, mV / V, mA / V, etc.).
This device does not incorporate any internal channels.
On the measuring instrument this gives the following channel assignment:
8.5 Potential separation
When organizing a properly functioning measuring setup it is very important to
ensure that no equalizing current can flow between sensors, power supply, and
peripherals. All measuring points must therefore either be insulated (e.g. by air
spacing) or lie at the same potential - and any unequal potentials that do exist
must be electrically isolated.
The nine analog inputs on this device are electrically isolated from one another
by means of photovoltaic relays. A new feature is the additional separation of
the measuring inputs from the CPU and power supply. However, for some ana-
log sensors this electrical isolation may have to be disabled again by means of
relay S (see above) or a wire jumper; some inputs would otherwise be left wi-
thout reference potential. The first time any such sensor is connected this re-
lay is set automatically by means of element flag 5 'ISO OFF'. (see Man. 6.10.3)
However, with certain connectors (e.g. divider connectors without power sup-
ply) element flag 5 should be checked and if necessary corrected. Between all
inputs and outputs (even those analog output cables not electrically isolated)
the maximum potential difference permitted is 50 V. The voltage at the measu-
ALMEMO® 809 19
M0 M1 M2 M3 M4
0.0
0.1
0.2
0.3
3.0
3.1
3.2
3.3
4.0
4.1
4.2
4.3
1.0
1.1
1.2
1.3
2.0
2.1
2.2
2.3
1. chann.
2. chann.
3. chann.
4. chann.
Sensor channels with
new channel numbering
5.0
5.1
5.2
5.3
6.0
6.1
6.2
6.3
7.0
7.1
7.2
7.3
8.0
8.1
8.2
8.3
M5 M6 M7 M8
V5/6 sensors D7 sensors
4.4 5.4 6.4 7.4 8.4
4.9 5.9 6.9 7.9 8.9
5. chann.
10. chann.
... ... ... ... ... ...

8. Connecting sensors / transducers
ring inputs themselves (between B, C, D, and A) must not exceed 12 V.
However, some components are not electrically isolated, namely all sen-
sors connected to the common internal power supply ±U and sensors combi-
ned within one connector. This also includes all D7 sensors; each such sensor
(in particular electrical measuring connectors) must therefore be used with a
small adapter cable ZA D700-GT; this provides electrical isolation for the pow-
er supply and data lines. Such problems do not affect sensors without a con-
ductive connection. Non-insulated sensors can be sufficiently protected by
electrically isolating the power supply (battery, mains adapter, or connecting
cable with DC/DC converter).
Data and trigger cables are also insulated by means of optocouplers.
20 ALMEMO® 809
M0
M1
M2
Datenkabel
AC
DC
DC
DC
ADC uC
U-
U+
V5-Fühler
Versorgung
10..30V=
230V≈
Galv. getrennt S
DC DC
A
B
M3
D7-Fühler
Galv. getrennt
ZAD700-GT