Ahlborn ALMEMO 2590-2 User manual

____________________________
Operating instructions
Universal measuring instruments and
data loggers
ALMEMO® 2590-2/-3 /-4
V1.3
03.07.2007
www.ahlborn.com

1. Operating controls
1. OPERATING CONTROL
(1) Measuring inputs M0 to M3
(depending on type)
M0 ... M3 S itable for all ALMEMO® sensors
M10 ... M34 p to 16 additional channels
(2) Output sockets A1, A2
A1 V24 interface (ZA 1909-DK5)
Optic fiber (ZA 1909-DKL)
USB (ZA 19019-DKU)
Ethernet (ZA 1945-DK)
RS 422 (ZA 5099-NVL/NVB)
Trigger inp t (ZA 1000-ET/EK)
Relay o tp ts (ZA 1006-EGK)
Analog o tp t 1 (ZA 1601-RK)
A2 Network cable (ZA1999-NK5/NKL)
MMC card c nnect r (ZA1904-MMC)
Trigger inp t (ZA 1000-ET/EK)
Relay o tp ts (ZA 1006-EGK)
Analog o tp t 2 (ZA 1601-RK)
(3) ocket, DC, 12V
Mains adapter (ZA1312-NA1,12V,0.2A)
Cable, electr. isolated (ZA 2690-UK, 10-30V)
(4) leep LED
(5) LCD, graphics display
7 lines for functions
1 line for softkeys F1,◄,▲,►, F2
Sh wn in brackets : <MEM> , <FCT>
(6) Operating keys
ON To switch device ON.
To switch device OFF, press and h ld d wn.
F1 , F2 F nction keys (s ftkeys)
▲, ▼ ... M: To select meas ring point
▲, ▼, ► F: To select men
PROG , ▼... F: F nction selection
◄ ... To ret rn to men selection
< M◄◄ > To go directly to meas. men
PROG Programming
▲, ▼, ►... Data inp t
Rear of device
(7) Battery compartment
3 AA alkaline-manganese batteries
2 ALMEMO® 2590

Contents
2. CONTENT
1. OPERATING CONTROL ......................................................................... 2
3. GENERAL .................................................................................................. 6
3.1 Warranty .............................................................................................. 6
3.2 cope of delivery ................................................................................ 7
3.3 Handling batteries / rechargeable batteries correctly ..................... 7
3.4 pecial notes on use .......................................................................... 7
4. INTRODUCTION ........................................................................................ 8
4.1 Functions............................................................................................. 8
4.1.1 Sensor programming .................................................................. 8
4.1.2 Meas ring operations ............................................................... 10
4.1.3 Process control ......................................................................... 11
5. INITIAL COMMI IONING ...................................................................... 13
6. POWER UPPLY .................................................................................... 14
6.1 Battery operation and supply voltage monitoring ......................... 14
6.2 Mains operation ................................................................................ 14
6.3 External DC voltage supply ............................................................. 14
6.4 ensor supply ................................................................................... 14
6.5 witching ON / OFF, reinitialization ................................................ 15
6.6 Data buffering ................................................................................... 15
7. CONNECTING THE EN OR / TRAN DUCER ................................ 15
7.1 ensors / transducers ...................................................................... 15
7.2 Measuring inputs and additional channels .................................... 16
7.3 Potential separation ......................................................................... 17
8. DI PLAY AND KEYPAD ......................................................................... 18
8.1 Display and menu selection ............................................................ 18
8.2 Measured value display and status symbols ................................. 18
8.3 Function keys ................................................................................... 19
8.4 Function selection ............................................................................ 20
8.5 Data input .......................................................................................... 20
9. MENU ELECTION ................................................................................. 22
10. MEA URING MENU ............................................................................. 22
10.1 Menu ensor display ...................................................................... 22
10.1.1 Selecting a meas ring point ................................................... 23
10.2 Measured value correction and compensation ........................... 23
10.2.1 Set meas red val e to zero .................................................... 23
10.2.2 Sensor adj stment for dynamic press re probes ................... 24
10.2.3 Sensor adj stment for chemical sensors and probes ............. 24
10.2.4 Temperat re compensation .................................................. 25
ALMEMO® 2590 3

2. Contents
10.2.5 Atmospheric press re compensation ..................................... 26
10.2.6 Cold j nction compensation ................................................... 26
10.3 Differential measurement .............................................................. 27
10.4 Menu Measuring points list ........................................................... 27
10.5 User measuring menu U1 data logger .......................................... 28
10.6 User menus ..................................................................................... 29
10.6.1 F nctions ................................................................................ 29
10.6.2 Men config ration ................................................................ 30
11. FUNCTION MENU ................................................................................. 31
11.1 Maximum, minimum, individual values memory ......................... 31
11.2 Averaging ........................................................................................ 32
11.2.1 Smoothing meas val es by means of a sliding average ......... 32
11.2.2 Averaging over individ al man al meas operations ................33
11.2.3 Averaging over time ................................................................ 33
11.2.4 Averaging over the cycle ........................................................ 34
11.2.5 Averaging over meas ring points ........................................... 35
11.2.6 Vol me flow meas rement ..................................................... 35
11.2.7 Array meas ring Option VN..................................................... 36
11.3 Two-point adjustment with setpoint entry ................................... 37
11.4 caling ............................................................................................. 37
11.5 Data logger functions ..................................................................... 38
11.5.1 Internal data memory .............................................................. 38
11.5.2 Memory connector with m ltimedia card................................. 39
11.5.3 Date and time-of-day .............................................................. 39
11.5.4 Once-only o tp t / saving of all meas ring points................... 40
11.5.5 Cyclic o tp t / saving of all meas ring points.......................... 40
11.5.6 N mbering of meas ring operations....................................... 41
11.5.7 Memory space, memory o tp t, clearing the memory............. 41
11.5.8 Scanning config ration ........................................................... 42
11.5.8.1 Cycle with saving to memory activated ............................ 42
11.5.8.2 Scanning mode ............................................................... 42
11.5.8.3 O tp t format................................................................... 44
11.5.8.4 Meas ring rate, contin o s meas ring point scan........... 44
11.5.8.5 Memory time .................................................................... 45
11.5.9 Starting and stopping meas ring operations........................... 45
12. EN OR PROGRAMMING ..................................................................... 46
12.1 electing the input channel ........................................................... 46
12.2 Measuring point designation.......................................................... 47
12.3 Averaging mode.............................................................................. 47
12.4 Locking the sensor programming.................................................. 47
12.5 Limit values...................................................................................... 48
12.6 caling, Decimal point setting....................................................... 48
12.7 Correction values............................................................................ 49
4 ALMEMO® 2590

Contents
12.8 Changing the units.......................................................................... 49
12.9 electing the measuring range...................................................... 50
12.10 Function channels ........................................................................ 53
12.11 pecial meas. ranges ,Linearization ,Multi-point calibration ....54
12.12 pecial functions........................................................................... 55
12.12.1 Print cycle factor.................................................................... 55
12.12.2 Actions in the event of a limit val e being exceeded............. 55
12.12.3 Analog start and analog end ................................................. 56
12.12.4 Minim m sensor s pply voltage ........................................... 57
12.12.5 O tp t f nction...................................................................... 57
12.12.6 Reference channel 1............................................................. 58
12.12.7 Reference channel 2 or m ltiplexer ...................................... 58
12.12.8 Element flags......................................................................... 58
13. DEVICE CONFIGURATION...................................................................... 59
13.1 Device designation.......................................................................... 59
13.2 Language......................................................................................... 59
13.3 Illumination and contrast................................................................ 59
13.4 Interface, device address, and networking .................................. 60
13.5 Baud rate, Data format.................................................................... 60
13.6 Atmospheric pressure compensation and temperature compen-
sation ....................................................................................................... 60
13.7 Hysteresis........................................................................................ 61
13.8 Operating parameters..................................................................... 61
14. OUTPUT MODULE ................................................................................ 61
14.1 Data cables ..................................................................................... 61
14.2 Relay-trigger modules .................................................................... 62
14.3 Analog outputs................................................................................ 63
15. TROUBLE- HOOTING ........................................................................... 65
16. ELECTROMAGNETIC COMPATIBILITY (EMC)...................................... 66
17. APPENDIX................................................................................................ 67
17.1 Technical data ................................................................................ 67
17.2 Product overview ........................................................................... 68
17.3 Index ................................................................................................ 69
17.4 Your contact.................................................................................... 74
ALMEMO® 2590 5

3. General
3. GENERAL
Congrat lations on yo r p rchase of this new and innovative ALMEMO® data
logger. Thanks to the patented ALMEMO® connector the device config res it-
self a tomatically and thanks to the men s and context-sensitive help windows
its operation sho ld be fairly straightforward. The device can, however, be
sed with s ch a wide range of sensors and peripherals and offers many differ-
ent special f nctions. Yo are advised therefore to properly familiarize yo rself
with the way the sensors f nction and with the device's n mero s possibilities
and take the time to caref lly read these operating instr ctions and the appro-
priate sections in the ALMEMO® Man al. This is absol tely necessary to avoid
operating and meas ring errors and to prevent damage to the device. To help
yo find the answers to yo r q estions q ickly and easily there is a compre-
hensive index at the end both of these operating instr ctions and of the Man -
al.
3.1 Warranty
Each and every device, before leaving o r factory, ndergoes n mero s q ali-
ty tests. We provide a g arantee, lasting two years from delivery date, that yo r
device will f nction tro ble-free. Before yo send yo r device to s, please ob-
serve the advisory notes in Chapter 15. Tro ble-shooting In the nlikely event
that the device proves defective and yo need to ret rn it please wherever pos-
sible se the original packaging material for dispatch and enclose a clear and
informative description of the fa lt and of the conditions in which it occ rs.
This g arantee will not apply in the following cases :
The c stomer attempts any form of na thorized tampering and alteration
inside the device.
The device is sed in environments and conditions for which it is not s ited.
The device is sed with ns itable power s pply eq ipment and peripher-
als.
The device is sed for any p rpose other than that for which it is intended.
The device is damaged by electrostatic discharge or lightning.
The ser fails to observe and comply with the operating instr ctions.
The man fact rer reserves the right to change the prod ct's characteristics in
the light of technical progress or to benefit from the introd ction of new compo-
nents.
6 ALMEMO® 2590

Scope of delivery
3.2 cope of delivery
When yo npack the device check caref lly for any signs of transport damage
and ens re that delivery is complete.
Meas ring instr ment ALMEMO® 2590 with 3 AA alkaline batteries
These operating instr ctions
ALMEMO® Man al
CD with the AMR-Control software and vario s sef l accessories
In the event of transport damage please retain the packaging material and in-
form yo r s pplier immediately.
3.3 Handling batteries / rechargeable batteries correctly
When inserting batteries / rechargeable batteries ens re that
these are correctly polarized.
If the device will probably not be needed for a relatively long peri-
od of time or if the batteries are empty remove the batteries; this
will prevent battery acid spilling on and damaging the device.
Rechargeable batteries sho ld be recharged as and when nec-
essary.
Yo sho ld never attempt to recharge an ordinary (non-recharge-
able) battery; it may explode !
Batteries / rechargeable batteries m st never be short-circ ited
or thrown on the fire.
Batteries / rechargeable batteries are special waste and m st not
be discarded together with normal domestic waste.
3.4 pecial notes on use
If the device is bro ght into the work-room from a cold environment there is
a risk that condensation might form on the electronics. In meas ring opera-
tions involving thermoco ples prono nced changes in temperat re may
ca se s bstantial meas ring errors. Yo are advised therefore to wait ntil
the device has adj sted to the ambient temperat re before starting to se
it.
Before sing the mains adapter make s re that the mains voltage is s it-
able.
Be s re to observe the maxim m load capacity of the sensor power s pply.
Sensors with integrated power s pply are not electrically isolated from one
another.
Do not r n sensor lines in the vicinity of high-voltage power cables.
Before yo to ch any sensor lines, ens re that all static electricity has been
discharged.
ALMEMO® 2590 7

4. Introd ction
4. INTRODUCTION
The ALMEMO® 2590 series is a new member in o r family of niq e meas r-
ing devices - all eq ipped with Ahlborn's patented ALMEMO® connector sys-
tem. The intelligent ALMEMO® connector offers decisive advantages when
connecting sensors and peripherals beca se all parameters are stored in an
EEPROM located on the connector itself; repeat programming is th s no
longer necessary.
All sensors and o tp t mod les can be connected to all ALMEMO® meas ring
instr ments in the same way. Programming and f nctioning are identical for all
nits. The following points apply to all devices in the ALMEMO® meas ring
system; these are described in detail in the ALMEMO® Man al which is incl d-
ed in delivery with each device.
Detailed explanation of the ALMEMO® system (Man al Ch 1)
Overview of the device f nctions and meas ring ranges (Man al Ch 2)
Basic principles, operation, and technical data for all sensors (Man al Ch 3)
Options for connecting yo r own existing sensors (Man al Ch 4)
All analog and digital o tp t mod les (Man al Section 5.1)
Interface mod les RS232, USB, Ethernet, optic fiber (Man al Section 5.2)
The whole ALMEMO® networking system (Man al Section 5.3)
All f nctions and their operation via the interface (Man al Ch 6)
Complete list of interface commands with all the printo ts (Man al Ch 7)
The operating instr ctions yo are now reading cover only those feat res and
controls that are specific to this device. Many sections therefore also refer to
the more detailed description in the Man al; (see Man al, Section xxx).
4.1 Functions
The ALMEMO® 2590 series devices have 2, 3, or 4 electrically isolated mea-
s ring inp ts s itable for all ALMEMO® sensors. The meas ring possibilities
are virt ally nlimited; there are 8 to 16 channels in the sensor connectors and
4 device-internal f nction channels - with over 70 meas ring ranges. For oper-
ation p rposes the device incorporates an LCD graphics display and a softkey
keypad with c rsor block. The display can via sensor-specific men s ( ser-
config rable) adapt ideally to all applications. A memory connector (MMC card)
or 64-KB EEPROM can be sed to implement a data logger f nction (types 3
and 4 only). There are two o tp t sockets which can be sed to connect any
ALMEMO® o tp t mod les, e.g. analog o tp t, digital interface, trigger inp t,
or alarm contacts. Several devices can be networked by simply connecting
them with network cables.
4.1.1 ensor programming
The meas ring channels are programmed, completely and a tomatically, by
the ALMEMO® connectors. However, the ser can easily s pplement or modify
this programming via the keypad or via the interface.
8 ALMEMO® 2590

F nctions
Measuring ranges
Appropriate meas ring ranges are available for all sensors with a non-linear
characteristic, e.g. 10 thermoco ple types, NTC and PT100 probes, infrared
sensors, and flow transd cers (rotating vanes, thermoanemometers, Pitot
t bes). For h midity sensors additional f nction channels are available for cal-
c lating h midity variables s ch as dew point, mixt re ratio, vapor press re,
and enthalpy. Even complex chemical sensors are s pported. Meas red val-
es from other sensors can also be acq ired sing the voltage, c rrent, and re-
sistance ranges with individ al scaling in the connector. Existing sensors can
also be sed - so long as the appropriate ALMEMO® connector is connected
via its screw terminals. For digital inp t signals, freq encies, and p lses,
adapter connectors are available with an integrated microcontroller. It is th s
possible to connect virt ally any sensor to any ALMEMO® meas ring instr -
ment and to change sensors witho t the need for any extra settings.
Function channels
Maxim m, minim m, average, and differential val es from certain meas ring
points can be programmed as f nction channels, also internal channels, and
can be processed and printed o t like normal meas ring points. There are also
f nction channels available for special meas ring tasks, e.g. to determine the
temperat re coefficient Q/∆T and wet b lb globe temperat re.
Units
The 2-character nits display can be adapted for each meas ring channel so
that both the display and the printo t always indicate the correct nits, e.g.
when a transmitter is connected. Conversion between °C (Centigrade) and °F
(Fahrenheit) is performed a tomatically.
Measured value designation
Each sensor is identified by means of a 10-character alphan meric name. It is
entered via the keypad or the interface and appears in the display, in the print-
o t, or on the comp ter screen.
Correction of measured values
The meas red val e on each meas ring channel can be corrected both in
terms of zero-point and gain; this means that even sensors s ally req iring
initial adj stment (e.g. expansion, force, pH) can be freely interchanged. Zero-
point correction and, partly at least, gain adj stment can be performed at the
to ch of a b tton. Sensors with m lti-point calibration can also be connected;
(see Man al Section 6.3.13).
caling
The corrected meas red val e on each meas ring channel can also be f rther
scaled in terms of zero-point and gain - sing the base val e and factor. The
decimal point position can be set by means of the exponent f nction. The scaling
val es can be calc lated a tomatically by setting to zero and entering the nomi-
nal setpoint or via the scaling men .
Limit values and alarm
Per meas ring channel two limit val es can be set (1 maxim m and 1 mini-
ALMEMO® 2590 9

4. Introd ction
m m). In the event of one of these limit val es being exceeded an alarm signal
is o tp t and relay o tp t mod les act ate the associated alarm contacts;
these can be allocated individ ally to specific limit val es. Hysteresis is set by
defa lt to 10 digits b t this can be adj sted to any n mber between 0 and 99.
The exceeding of a limit val e can also be sed to a tomatically start or stop
meas red val e recording.
ensor locking
All sensor data stored in the connector EEPROM can be protected by means
of a grad ated locking f nction against ndesired access.
4.1.2 Measuring operations
For each transd cer 4 meas ring channels are available; i.e. it is also possible
to eval ate do ble sensors, individ ally scaled sensors, and sensors with f nc-
tion channels. Yo can move forwards or backwards from one meas ring
channel to the next sing the keypad. The selected meas ring point is by de-
fa lt assigned preferred stat s and is scanned at half the meas ring rate; all
other active channels are also scanned b t in the backgro nd (semi-contin -
o s mode). The data is o tp t on the display and, if available, to an analog o t-
p t. To shorten the response time when there are many meas ring points the
meas ring rate can be set to contin o s and increased accordingly.
Measured values
The meas red val es can be indicated on the display sing a variety of men s,
some ser-config rable, in 2 font sizes, or in the form of a bar chart. Meas red
val es are acq ired a tomatically with a to-zero and self-calibration; however,
they can also be corrected and scaled arbitrarily as req ired. With most sen-
sors a sensor breakage is detected a tomatically.
Analog output and scaling
Each meas ring point can be scaled by means of analog start and analog end
in s ch a way that the meas ring range th s defined covers the f ll range of
the bar chart or of an analog o tp t (2 V, 10 V, or 20 mA). At the analog o t-
p t the device can o tp t the meas red val e from any meas ring point or a
programmed val e.
Measuring functions
With some sensors, to achieve optimal meas red val e acq isition, certain
special meas ring f nctions are req ired. Cold j nction compensation is pro-
vided for thermoco ples; temperat re compensation is provided for dynamic
press re, pH, and cond ctivity probes; and atmospheric press re compensa-
tion is provided for h midity sensors, dynamic press re sensors, and O2 sen-
sors. On infrared sensors the gain correction parameter is sed as emissivity
factor.
Measured value smoothing
Meas red val es of an nstable or strongly fl ct ating nat re can be smoothed
by means of a sliding average over a n mber of val es programmable from 2
to 99.
10 ALMEMO® 2590

F nctions
Maximum and minimum values
For each meas ring operation the maxim m val e and minim m val e are ac-
q ired and saved to memory. These val es can then be displayed, printed o t,
or deleted from memory.
Average value
Man al averaging is available per channel over a certain period or cycle or
over a series of individ al meas ring operations. Networked meas ring (Op-
tion VN)permits a standardized vol me flow meas rement.
Measured value memory
Up to 100 meas red val es can be saved man ally. This data can then be
shown on the display or o tp t via the interface.
4.1.3 Process control
To record the meas red val es from all connected sensors in digital form mea-
s ring point scanning is performed contin o sly with meas red val e o tp t
according to a time-based process control. This may be per o tp t cycle or, if
really rapid res lts are req ired, at the meas ring rate itself. In data logger
mode a meas ring operation can be started and stopped by means of the key-
board, the interface, an external trigger signal, the real-time clock, or by a
specified limit val e being exceeded.
Date and time-of-day
All meas ring operations can be acc rately logged sing the real-time clock
with date f nction or in terms of the p re meas ring time. For the p rposes of
starting / stopping a meas ring operation, the start / stop date and time-of-day
can be programmed.
Cycle
The cycle can be programmed to any val e between 00:00:01 (1 second) and
59:59:59 hh:mm:ss. This f nction permits cyclic o tp t of meas red val es to
the interfaces or to the memory and provides cyclic calc lation of the average
val e.
Print cycle factor
The print cycle factor can be sed to limit data o tp t from partic lar channels;
this may be necessary in order to red ce excessive data flow especially while
data is being saved.
Averaging over measuring point scans
The meas red val es from meas ring point scans can be averaged either over
the whole meas ring d ration or over the specified cycle. These average val-
es can then be o tp t and saved on a cyclic basis to f nction channels pro-
vided for this p rpose.
Measuring rate
The meas ring points are contin o sly scanned at the meas ring rate (2.5 or
10 mops). Recording can be accelerated if all meas red val es are stored to
memory and / or o tp t to the interface at the meas ring rate.
ALMEMO® 2590 11

4. Introd ction
Measured value memory
On data logger 2590-3S or 2590-4S all meas red val es can be saved to an
EEPROM either man ally or a tomatically per cycle. Standard memory capaci-
ty is 64 KB - s fficient for p to 12,000 meas red val es. The memory can be
organized and config red in linear or ring form. O tp t is via the interface. Se-
lection can be specified according to a time interval or n mber.
All devices in the ALMEMO® 2590 series can, by fitting an external memory
connector with a m ltimedia card, be pgraded to a high-capacity data logger.
With an external memory connector, available as an accessory, files can be
read o t very q ickly via any standard card reader.
Numbering of measuring operations
By entering a n mber single scans or entire series of meas ring operations
can be identified and selectively read o t from the memory.
Control ports
A relay trigger analog adapter can be sed to provide p to 10 o tp t relays,
and, as option, p to 4 analog o tp ts and 2 trigger inp ts.
Operation
All meas ring and f nction val es can be displayed in different men s on the
dot matrix LCD screen. User men s can be individ ally config red from a
range of nearly 50 f nctions for yo r specific applications. Yo can se texts,
lines, and blank lines to arrange and format the layo t in a style s ited to yo r
application. Six keys (fo r of them softkeys) can be sed to operate the device.
This system also allows yo to f lly program the sensors, the device and the
process control.
Output
All data logs, men f nctions, saved meas red val es, and stored program pa-
rameters can be o tp t to any peripheral eq ipment. RS232, RS422, USB, and
Ethernet interfaces are available sing the appropriate interface cables. Mea-
s red data can be o tp t in list, col mn, or table format. Files in table format
can be processed directly sing any standard spreadsheet software. The print
header can be programmed to refer specifically to yo r company or to yo r ap-
plication.
Networking
All ALMEMO® devices can be addressed and can be easily networked by sim-
ply linking them together via network cable or for longer distances via RS422
network distrib tors.
oftware
Each ALMEMO® Man al is accompanied by the AMR-Control software pack-
age, which can be sed to config re the meas ring instr ment and ser
men s, to program the sensors, and to read o t from the meas red val e
memory. Using the integrated terminal, meas ring operations can also be per-
formed online. The WINDOWS® software package WIN-Control is provided for
the p rposes of meas red val e acq isition via networked devices, for graphi-
cal presentation, and for more complex data processing.
12 ALMEMO® 2590

Initial commissioning
5. INITIAL COMMI IONING
ensor connection Connect the sensor to any socket M0 to M3 (1); see Ch 7.
Power supply via batteries or mains adapter to DC (3) ; see 6.1, 6.2
To switch ON press the ON / PROG key (6) ; see 6.5
A tomatic display of last meas ring men see Ch 10.
To call up menu selection
press key(s) : <MENU>
To activate / deactivate display ill mination : <ON>
To select meas ring men Sensor display ; see 8.1
press key(s) : <F> : ▲ / ▼ ...
To call p the men press key(s) : ► r PROG
To select a measuring point (see 10.1.1)
press key(s) : <M> : ▲ / ▼ ...
All channels on the connector or those f nctions needed
for meas red val e calc lation are displayed.
To call up the functions menu list : < FCT >
To select the functions menu (see 8.4)
press key(s) : <F> : ▲ / ▼ ...
To call p the men press key(s) : ► r PROG
e.g. Functions menu Data logger functions :
(only possible if storage medi m available)
Once-only saving : see 11.5.4 < MANU >
Cyclic saving : see 11.5.5
To select cycle timer press key(s) : PROG , ▲ / ▼ ...
Entering the cycle (hh:mm:ss) PROG , ▲ , PROG ..
To set the o tp t format : < FORM> ...
To terminate programming mode : < ESC>
To start a meas ring operation <START>
To stop a meas ring operation <STOP>
Memory output via interface to printer or computer :
- Connect peripheral device via data cable to socket A1 (2); see Manual, Secti n 5.2
To select free memory press key(s) : PROG ,  ...
O tp t memory ; see 11.5.7 < PMEM> or command ´P04´ from the comp ter
Clear the memory ; see 11.5.7 < CMEM > or command ´C04´ from the comp ter
Important keys : To ret rn as far back as men selection,
press key(s) : ◄ ..., To go to the meas ring men : < M◄◄ >
ALMEMO® 2590 13


6. Power s pply
6. POWER UPPLY
Power can be s pplied to the meas ring instr ment in any of the following
ways : 3 AA alkaline batteries (included in delivery)
Mains adapter 12V, 0.2A with ALMEMO® c nnect r ZA 1312-NA1
Electrically is lated p wer supply cable (10 t 30 VDC, 0.25 A) ZA 2690-UK
O r prod ct spectr m incl des all the appropriate accessories.
6.1 Battery operation and supply voltage monitoring
Power is s pplied to the meas ring instr ment as delivered by 3 AA batteries.
At a c rrent cons mption of approx. 20 mA the operating time will be approx.
150 ho rs. If the ill mination is constantly switched on, this operating period is
red ced to approx. 75 ho rs. To prolong the operating time for the p rposes of
long-term recording the device can be left in SLEEP mode; (see 11.5.8.2). The
operating voltage can be checked in the Info men (see 9); this gives yo a
basis for estimating the remaining operating time. As soon as the remaining
battery capacity drops to approx. 10% the ´´µµµµµµµµµ¶ symbol in the stat s bar of the
display will start to flash. If the batteries are completely discharged, the device
will switch off at 3.1 V b t meas red data already acq ired and the time-of-day
will be retained; (see 6.6). To replace old batteries first nscrew the battery
compartment cover (7) on the rear of the device.
6.2 Mains operation
To power the device from an external so rce preferably se the mains adapter
(ZA 1312-NA1) (12V/0.2A); connect this to the DC socket (3). Please ens re
that the mains voltage is correct. The sensor voltage rises to approx. 12 V.
6.3 External DC voltage supply
The DC socket (3) can also be sed to connect another DC voltage, 6 to 13 V
(minim m 200 mA). This is connected via an ALMEMO® connector (ZA1012-
FS). If, however, the power s pply has to be electrically isolated from the trans-
d cers or if a larger inp t voltage range (10 to 30 V) is req ired, then electrical-
ly isolated s pply cable ZA 2690-UK m st be sed. It will then be possible to
se the meas ring instr ment in a 12-volt or 24-volt on-board s pply system.
6.4 ensor supply
At the terminals + (pl s) and - (min s) in the ALMEMO® connector a 9-volt sen-
sor s pply voltage is available (self-healing f se, total c rrent 500 mA). In the
case of an external s pply the voltage rises to approx. the applied voltage. Oth-
er voltages (12, 15, or 24 V or references for a potentiometer and strain ga ge)
can also be obtained sing special connectors; (see Man al 4.2.5 and 4.2.6).
14 ALMEMO® 2590

Switching ON / OFF, reinitialization
6.5 witching ON / OFF, reinitialization
To switch ON press key(s) : ON PROGr (6) located in the middle of the c rsor
block. The meas ring men most recently selected always appears first in the
display.
To switch OFF press and hold down the same key(s) ON PROGr. After the de-
vice is switched off the real-time clock contin es to r n and all saved val es
data and settings are retained intact; (see 6.6).
If interference (e.g. electrostatic) or a malf nction (e.g. battery fail re) ca ses
the device to behave abnormally, the device can be reinitialized. To activate
Reset press F1 r when switching on. However, the date and time-of-day set-
tings will be lost. To restore all device programming (incl ding device designa-
tion, ser men s, process control, etc.) to the factory defa lt settings press F2
when switching on. In so doing many parameters will be lost or be restored to
their defa lts : Lang age = German, Ill mination = off, Device address = 00,
Atmospheric press re = 1013 mbar, Temperat re compensation = 25°C, Hys-
teresis =10, Meas ring rate = 2.5 mops semi-contin o s. Only the program-
ming of the sensors in the ALMEMO® connectors remains naffected.
6.6 Data buffering
The sensor's programming is stored in the EEPROM on the sensor connector;
the internal data memory and the device's calibration and programmed param-
eters are stored in the EEPROM on the instr ment itself, all on a fail-safe ba-
sis. Date and time-of-day settings and the individ al val es memory are re-
tained intact if the device is j st switched off b t are lost when the device is re-
set or the batteries are replaced.
7. CONNECTING THE EN OR / TRAN DUCER
An die Any ALMEMO® sensor can be connected to any of the inp t sockets M0
to M1/M2/M3 (1) (depending on device type) on the ALMEMO® meas ring in-
str ment. To connect yo r own existing sensors yo simply need the appropri-
ate ALMEMO® connector.
7.1 ensors / transducers
The ALMEMO® Man al incl des detailed descriptions of the comprehensive
ALMEMO® range of sensors (see Man al Ch 3) and instr ctions for connecting
yo r own existing sensors to ALMEMO® instr ments (see Man al Ch 4). All
standard sensors with an ALMEMO® connector s ally have the meas ring
range and nits already programmed and can th s be connected to any inp t
socket witho t f rther adj stment. A mechanical coding system ens res that
sensors and o tp t mod les can only be connected to the correct sockets. All
ALMEMO® connectors incorporate two snap-lock levers; these snap into posi-
tion as soon as the connector is inserted into the socket, th s preventing nin-
ALMEMO® 2590 15

7. Connecting the sensors / transd cers
tended disconnection if the cable is accidentally p lled. To withdraw the con-
nector, both these levers m st be pressed in at the sides.
Splash-proof variants of devices in the ALMEMO® 2590 series are also avail-
able as options. For this p rpose a n mber of new sensors are now available
with spray-coated ALMEMO® connectors incorporating a do ble sealing lip
specially designed to protect the socket nit against the effects of penetration
by splashing water. For any n sed sockets protective stoppers are available.
7.2 Measuring inputs and additional channels
The ALMEMO® 2590-2/3/4 meas ring instr ments incorporate respectively 2,
3, or 4 inp t sockets (1) to which initially meas ring channels M0 to M1/M2/M3
are allocated. However, ALMEMO® sensors can, if req ired, provide p to 4
channels with 4 inp t sockets each so that altogether 16 channels are avail-
able. The additional channels can be sed in partic lar for h midity sensors
with 4 meas ring variables (temperat re / h midity / dew point / mixt re ratio)
or for f nction channels. Each sensor can if necessary be programmed with
several meas ring ranges or scaling settings; and 2 or 3 sensors, if pin assign-
ment so permits, can be combined in a single connector (e.g. rH / NTC, mV /
V, mA / V, etc.). The additional meas ring channel n mbers per connector go
p in steps of 10 (e.g. the first sensor has channels M0, M10, ... and the second
sensor has channels M1, M11, .... etc.).
Device-internal channels
A f rther innovation on devices in this series is the 4 additional device-internal
channels, these are the next after the last available socket. The first of these is
programmed by defa lt as differential channel M1 – M0. This only applies,
however, if there are two sensors with the same nits and same decimal point
position connected at meas ring points M0 and M1. The fo rth (M32/M33/M34,
depending on type) is sed temporarily for the p rposes of averaging (see
11.2). However, all 4 channels can be programmed with any other f nction
channels (e.g. U-Bat, cold j nction compensation, averages, vol me flow,
etc.); (see 12.10, Man al Section 6.3.4).
The advantage of device-internal channels is that when sing several sensors
for the same application these sensors do not have to be reprogrammed and
can be exchanged witho t losing the f nction channels. However, if the whole
application operates with j st one sensor, then programming on the sensor it-
self makes more sense.
This, depending on device type, gives the following channel assignments :
16 ALMEMO® 2590

Meas ring inp ts and additional channels
7.3 Potential separation
When organizing a properly f nctioning meas ring set p it is very important to
ens re that no eq alizing c rrent can flow between sensors, power s pply, and
peripherals. All points m st therefore lie at the same potential and / or any n-
eq al potentials m st be electrically isolated.
The analog inp ts are electrically isolated by means of photovoltaic relays; the
maxim m potential difference permitted between them is 50 VDC or 60 VAC.
Sensors combined within one connector and sensors with their own power
s pply, however, are electrically interconnected and m st therefore be operat-
ed in isolation. The voltage at the meas ring inp ts themselves m st not ex-
ceed 5 volts (between B, C, D, A and - ).
The power s pply is isolated by the transformer in the mains adapter or by a
DC/DC converter in connecting cable ZA2690-UK. Data and trigger cables are
eq ipped with optoco plers. If analog o tp t cables are not electrically isolated
the recording device or the sensors m st be zero-potential.
ALMEMO® 2590 17
M0 M1 M2 M3 M4
00
10
20
30
03
13
23
33
01
11
21
31
02
12
22
32
1. chan.
2. chan.
3. chan.
4. chan.
04
14
24
34
Device
internal
channels
Difference
M01-M00
sensor channels
2590-2
00
10
20
30
01
11
21
31
02
12
22
32
03
13
23
33
00
10
20
30
01
11
21
31
02
12
22
32
sensor channels
M0 M1 M2 M3M0 M1 M2
2590-3 2590-4
sensor channels
Device
internal
channels
Device
internal
channels
Average
M2
M1
M0
datacable
AC
DC
DC
DC
ADC uC
U-
U+
sensor
power supply
10..30V=
230V≈

8. Display and keypad
8. DI PLAY AND KEYPAD
8.1 Display and menu selection
The display (5) incorporated in the ALMEMO 2590 series consists of a dot ma-
trix LCD display with 128x64 pixels, or 8 rows of 8 pixels each.
Menu selection (see 9) provides the following :
3 meas ring men s for acq iring meas red val es,
Additional f nction men s (see 11), also accessible
from any meas ring men by pressing key <FCT> ,
3 programming men s for programming sensors
(see 12), device parameters (see 13), and o tp t
mod les (see 14),
Info men (see 9) for device information, sensor in-
formation
To call up menu selection, depending on men : ◄ ... r <MENU>
To switch on display illumination (see 13.3) <  ON >
To switch device OFF press and hold down key(s) : ON
To select men s press key(s) :  r  ...
To call p the selected men press key(s) :  r PROG
To view the most important device information: < NFO>
8.2 Measured value display and status symbols
The Sensor display men will show the selected
meas ring point, the meas red val e, and in
some cases the f nctions of importance for this
meas red val e, pl s any f rther meas ring
channels assigned to the connector in q estion.
For the meas. value a row of stat s symbols is available : ymbol :
No sensor, meas ring point deactivated ´- - - - -´
Relative meas ring with respect to a reference val e REL
Meas red val e modified with sensor correction or scaling º
Averaging in progress »
O tp t f nction Diff, Hi, Lo, M(t), Alarm (see 12.12.5) D , H , L , , A
C Compensation T Temperat re,
P Atmospheric press re, . contin o s CT. P. (. flashes)
Limit val e exceeded, maxim m or minim m s or t flashes
Overshoots meas ring range Maxim m val e O flashes
Undershoots meas ring range Minim m val e U flashes
18 ALMEMO® 2590

Meas red val e display and stat s symbols
Sensor breakage / sensor voltage Lo : Display ´-.-.-´ B flashes / L flashes
Battery voltage <3.8 V, remaining capacity <10% ´µµµµµµµµµ¶ flashes
The data logger menus (see below) will also show in the men 's top stat s
row the following symbols for checking the device status :
Contin o s meas ring point scan C
Meas ring operation stopped or started ll or ©
Meas ring point scan started with data saving REC
Meas ring point scan started with data o tp t via interface CO
Start time or end time of meas ring operation programmed l© or ©l
Stat s of the relays (external o tp t mod le) open / closed R-- or R01
Display ill mination activated or on pa se * or *
Battery stat s : f ll / half / empty ´´´´´´´´´¶, ´´´´´µµµµµ¶ , ´µµµµµµµµµ¶ flashes
8.3 Function keys
The way in which the f nction keys (6) F1 , F2 ,
and the c rsor keys ◄ , ► operate may differ
in each men . The f nction is indicated as an ab-
breviation in the bottom line of the display (soft-
keys). In the instr ctions and doc mentation
these softkey abbreviations are shown in angle
brackets, e.g. <START> .
All meas ring men s will initially provide
the following key f nctions :
To select the measuring point press c rsor keys :  or  ...
Help is provided by the softkey symbol which lights p in the middle : <M>
To call up function menu selection < FCT > r F2
Navigation thro gh several f nction men s : < ►F > r < F◄ >
Navigation thro gh several programming men s : < ►P > r < P◄ >
To return to men selection : < MENU > r ◄
To return to the last meas ring men : < M◄◄ >
The following softkeys only appear when the ser selects a f nction men or a
programming men (e.g. sensor programming) :
To ret rn from the meas ring men to the f nction men : < ►►F > r ►
To ret rn from the meas ring men to the last
programming men press key(s) : < P◄◄ > r F1
ALMEMO® 2590 19

8. Display and keypad
8.4 Function selection
Each men comprises a n mber of f nctions;
these may have to be activated or programmed
d ring operation.
In conj nction with certain f nctions a context-
sensitive help window will appear :
e.g.
To select functions press key(s) : PROG
The first changeable parameter is highlighted in inverse font : 25.45
Help is provided by the softkey symbol : <F> f r functi n selecti n
To j mp forward to the next f nction press key(s) :  or  ...
Depending on f nction the keys F1 , F2 or
◄ , ► are assigned the desired meaning, e.g.
Set meas red val e to zero <ZERO>
Meas red val e adj stment (pH, LF, O2) <ADJ>
Clear maxim m val e and minim m val e <CLR>
Clear memory <CMEM>
Set parameter directly <SET>
Cancel f nction <ESC>
8.5 Data input
When a programmable parameter is selected (see 8.4) yo can clear or repro-
gram the c rrent val e directly.
To clear the programmed values press key(s) : < CLR >
To program press key(s) : PROG
Yo are now in programming mode : <P> in the middle f the s ftkey r w
the c rsor flashes below the first inp t position Temp comp :
0025.0
°C
To increment the selected digit press key(s) :  ...
To decrement the selected digit press key(s) :  ...
To change the arithmetic sign of a n meric val e : < +/- >
To select the next position press key(s) : 
the c rsor flashes below the second digit Temp comp :
0025.0
°C
To move back to the previous digit 
Each position is programmed like the first  /  ..., 
To terminate data input : PROG
20 ALMEMO® 2590
13: 25.45 m/s
L840 flow º
Temp. comp. 45.7 °C
Atm. pressure 1027 mbar
03: 21.67 Pa dyn pressure
ZERO ESC F
Sensor adjustment to :
Setpoint 4.00 pH
ESC OK