Ahlborn ALMEMO 2690-8 User manual

____________________________
Operating Instructions
Data Logger
ALMEMO® 2690-8
V1.0
29.06.04
www.ahlborn.com

1. Operating Controls
1. OPERA ING CON ROLS
(1) Meas. inputs M0 to M4
M0 ... M4 for all ALMEMO-Sensors
M10...M34 1 additional channels
(2) Output sockets A1, A2
A1 Interface V24 (ZA 1909-DK5)
Fiber optics V24 (ZA 1909-DKL)
Ethernet (ZA 1945-DK)
Centronics (ZA 1936-DK)
RS 422 (ZA 5099-NVL/NVB)
Analog output 1 (ZA 1601-RK)
A2 Network cable (ZA1999-NK5/NKL)
Trigger input (ZA 1000-ET/EK)
Relay outputs (ZA 1000-EGK)
Analog output 2 (ZA 1601-RK)
(3) Connector socket DC 12V
Mains adapter(ZA 2690-NA, 12V, 0.2A)
Charging adapter (ZA 2690-LA, 12V)
DC-Cable isolat. (ZB 2690-UK, 10-30V)
(4) Sleep-LED
(5) LCD display
Status line:
CCont. measuring point scan
© , ll Measurement Start, Stop
REC Memory record
COM Output of meas. values
l©, ©l Meas. start, end programmed
R01 Alarm relay status
* , * Light on, pause
Battery operation/charge status
13 lines for functions
Function of keys F1, F2, F3, F4
(6) Control keys
ON , <POFF> Switch device on, off
 ,  ,  Function selection
F1 ... F4 Function keys ( oft key )
PROG Programming
 ,  ,  Data input
<ESC> Function abort
 Last measuring menu
(7) Rubber shock absorber
2 ALMEMO 2690-8
4
5
6
7
123
8
Back of unit:
(8) Battery box
3 Mignon Alkaline Batteries
or 3 Mignon NiCd/NiMH Accumulator
(9) Stand for stand and hang up
(for opening out from 90° to 180°
please press the stand together!)

Table of Contents
2. ABLE OF CON EN S
1. OPERA ING CON ROLS...........................................................................2
2. ABLE OF CON EN S
3. GENERAL.....................................................................................................6
3.1 Guarantee..............................................................................................6
3.2 Extent of the Delivery ..........................................................................7
3.3 Handling Batteries or Accumulators.................................................. 7
3.4 Special Operating Instructions............................................................7
4. IN RODUC ION..........................................................................................8
4.1 Function Range of the ALMEMO 2690-8............................................ 8
4.1.1 Sensor Programming.....................................................................8
4.1.2 Measurement...............................................................................10
4.1.3 Process flow control.................................................................... 11
5. INI IAL OPERA ION.................................................................................13
6. POWER SUPPLY.......................................................................................14
6.1 Battery operation and Supply Voltage Control................................14
6.2 Accumulator operation.......................................................................14
6.3 Mains Operation..................................................................................14
6.4 External DC Voltage Supply.............................................................. 15
6.5 Sensor Supply.....................................................................................15
6.6 Switch On/Off, Reinitialisation..........................................................15
6.7 Data buffering.....................................................................................15
7. CONNEC ION OF HE RANSDUCERS.................................................16
7.1 ransducers........................................................................................16
7.2 Measuring inputs and Additional Channels.....................................16
7.3 Isolation...............................................................................................17
8. DISPLAY AND KEYPAD............................................................................18
8.1 Display and Menu Selection..............................................................18
8.2 Function Keys ....................................................................................19
8.3 Control Symbols.................................................................................19
8.4 Function Selection..............................................................................20
8.5 Data Entry............................................................................................20
9. MEASURING USING MEASURING-MENUS............................................21
9.1 Measuring with one Measuring Point...............................................22
9.1.1 Selecting the Measuring Point.....................................................22
9.1.2 Peak Value Memory with Time and Date.................................... 22
9.2 Correction of the Meas. Value and Compensation ........................ 23
9.2.1 Setting the Meas. Value to Zero..................................................23
9.2.2 Zero Point Adjustment ................................................................24
9.2.3 Sensor Adjustment in the case of chemical sensors...................24
9.2.4 Two-point Adjustment with Setpoint Entry...................................2
ALMEMO® 2690-8 3

2. Table of Contents
9.2. Temperature Compensation .......................................................26
9.2.6 Atmospheric Pressure Compensation.........................................26
9.2.7 Cold Junction Compensation.......................................................27
9.3 Measuring point scans and Output.................................................. 28
9.3.1 Single Output / Storage of all Measuring Points..........................28
9.3.2 Cyclic Output / Storage of all Measuring Points.......................... 28
9.3.3 Memory space, Memory Output, Clearing the Memory...............29
9.3.4 Output of Menu Functions...........................................................29
9.3. Displaying Measured Values as a Line Diagram ........................30
9.4 Averaging............................................................................................31
9.4.1 Damping of Meas. values by a Sliding averag. window.............. 32
9.4.2 Averaging Mode...........................................................................32
9.4.3 Averaging over Manual Single Measurements............................32
9.4.4 Net Measurement........................................................................33
9.4. Averaging over the Measuring Time............................................34
9.4.6 Measurement Time......................................................................34
9.4.7 Averaging over the Cycle.............................................................3
9.4.8 Averaging over several Measuring Points...................................36
9.4.9 Volume Flow Measurement.........................................................37
9.5 Display of Several Measuring Points ...............................................38
9. .1 Menu Multi Channel Display and Bar chart................................. 38
9. .2 Differential Measurement............................................................38
9. .3 Menu List of Measuring Points....................................................39
9.6 Assistant-Menus for Special Meas. Operations.............................. 40
9.6.1 Thermal Coefficient.....................................................................40
9.6.2 Wet Bulb Globe Temperature......................................................40
9.7 User Menus.........................................................................................41
9.7.1 Functions.....................................................................................41
9.7.2 Configuration of the menus ........................................................ 42
9.7.3 Function Printouts........................................................................43
9.7.4 Programming via the Serial Interface:.........................................44
10. PROGRAMMING WI H PROGRAMMING-MENUS..................................45
10.1 imes and Cycles.............................................................................45
10.1.1 Time and Date ..........................................................................4
10.1.2 Cycle with Storage Activation and Output Format.....................4
10.1.3 Conversion Rate, Continuous Measuring Point Scan............... 46
10.1.4 Time and Date of Start, Time and Date of End ........................ 47
10.2 Data Memory.....................................................................................48
10.2.1 Data Acquisition.........................................................................48
10.2.2 Numbering of measurements....................................................49
10.2.3 Starting and Stopping of measurements...................................49
10.2.4 Sleepmodus...............................................................................49
10.2. Memory Output.......................................................................... 0
10.3 Sensor Programming.......................................................................52
4 ALMEMO 2690-8

Table of Contents
10.3.1 Selecting the Input Channel....................................................... 2
10.3.2 Measuring Point Designation..................................................... 3
10.3.3 Averaging Mode......................................................................... 3
10.3.4 Locking the Programming of the Sensor................................... 3
10.3. Limit Values............................................................................... 4
10.3.6 Scaling, Decimal Point Setting.................................................. 4
10.3.7 Correction Values......................................................................
10.3.8 Changing the Dimension...........................................................
10.3.9 Selecting the Measuring Range................................................
10.3.10 Function Channels .................................................................. 8
10.4 Special Functions.............................................................................59
10.4.1 Print Cycle Factor...................................................................... 9
10.4.2 Minimum Sensor Supply Voltage.............................................. 9
10.4.3 Limit Value Responses..............................................................60
10.4.4 Analog Output Start and End.....................................................61
10.4. Output Function.........................................................................61
10.4.6 Reference Channel 1.................................................................62
10.4.7 Reference Channel 2 or Multiplexer..........................................62
10.4.8 Element Flags............................................................................62
10.5 Device Configuration........................................................................63
10. .1 Device Designation....................................................................63
10. .2 Device Address and Networking............................................... 63
10. .3 Baud Rate, Data Format............................................................64
10. .4 Language...................................................................................64
10. . Lighting and Contrast.................................................................64
10. .6 Atmospheric Pressure...............................................................64
10. .7 Hysteresis..................................................................................6
10. .8 Operating Parameters...............................................................6
10.6 Output Modules................................................................................65
10.6.1 Data cable..................................................................................66
10.6.2 Relais Trigger Cable..................................................................66
10.6.3 Analog Output............................................................................67
10.7 Menu Power Supply..........................................................................68
11. ROUBLESHOO ING...............................................................................70
12. ELEC ROMAGNE IC COMPA IBILI Y..................................................71
13. APPENDIX..................................................................................................72
13.1 echnical Data ................................................................................. 72
13.2 Product overview .............................................................................72
13.3 Keyword index..................................................................................73
ALMEMO® 2690-8

3. General
3. GENERAL
Congratulations for buying this innovative ALMEMO® data logger. By means of
the patented ALMEMO® connectors the device configures itself and with the
help of menus and help windows the operation should not be too difficult. Ho-
wever, the device allows the connection of a great variety of sensors and peri-
pherals with many special functions. For getting to know the function range of
the sensors and the diverse possibilities of the device, you really should read
these operating instructions and the corresponding chapters of the ALMEMO
®
manual. This is the only way to avoid operating and measuring errors as well
as damages of the device. For a quick answer to all questions, a detailed key-
word index is provided at the end of the instructions and of the manual.
3.1 Guarantee
Every device has to pass through several quality tests before leaving the
works. For a perfect function, a guarantee of two years from the delivery date
is granted. Before sending back the device, please pay attention to the indica-
tions in chapter 11. Troubleshooting. Should there actually be a defect, please
use the original packing material for depatch if possible and enclose an ex-
pressive description of the trouble in connection with the corresponding circum-
stances.
In the following cases a guarantee benefit is excluded:
After forbidden operations and changes in the device by the client
Operating in surrounding conditions that are not valid for this product
Using unsuitable power supply and peripherals
Using the device in a way it is not determined for
Damages through electrostatic discharge or flash of lightning
Not paying attention to the operating instructions
Changes in the product features in favour of technical progress or due to new
components are reserved to the producer.
6 ALMEMO 2690-8

Extent of the Delivery
3.2 Extent of the Delivery
While unwrapping the delivery, pay attention to damages of the device and to
its completeness:
Measuring device ALMEMO® 2690-8 with 3 alkaline-mignon-batteries,
Rubber shock absorber with a stand,
these operating instructions,
ALMEMO® Manual,
CD with Software AMR-Control and useful accessories
In case of a transportation damage, the packing material is to be kept and the
supplier is to be informed immediately.
3.3 Handling Batteries or Accumulators
When putting in the batteries/accumulators the right pole is to be
considered.
Remove the batteries from the device when they are empty or
when the device is not used for a long time in order to avoid
damages through running out cells. Accumulators should corre-
spondingly be charged in time.
Batteries are not to be charged, danger of explosion!
Pay attention to batteries/accumulators not being short-circuited
or thrown into the fire.
Batteries/accumulators are special refuse and must not be
thrown in the dustbin!
3.4 Special Operating Instructions
When the device is brought from cold surroundings into the work room, the-
re can appear some kind of dew on the electronic. At thermocouple measu-
rements and high changes in temperature, greater measuring errors are
additionally possible. Therefore, please wait until the device is adapted to
the ambient temperature before operating with it.
When connecting mains adapters the mains voltage is to be considered
Pay attention to the maximum capacity of the power supply of the sensors
Sensors with supply are not electrically isolated from each other.
Do not lay the sensor cables near power lines.
Mind the diversion of statical electricity before touching the sensor cables.
Opening out the stand (9) at the back of the rubber shock absorber (7) you
can bring the device in a sloping position for a better legibility. When you
press the stand together, it can also be folded up over the stop in order to
hang up the device on corresponding gadgets.
ALMEMO® 2690-8 7

4. Introduction
4. IN RODUC ION
The data logger ALMEMO® 2690-8 is a new instrument from the unique pro-
duct range of measuring devices that are all equipped with the ALMEMO®
connector system, which has been patented by Ahlborn GmbH. The intelligent
ALMEMO® connector provides important advantages with regard to the
connection of sensors and peripherals as all parameters are stored in an EE-
PROM within the connector. As a result, the programming that usually has to
be performed for the connection is not required. All sensors and output modu-
les can be connected to all ALMEMO® measuring devices in the same way.
The operation and programming is identical with all units. Therefore, all of the
ALMEMO® measuring system items listed below are described, in detail, in a
separate ALMEMO® manual that is supplied with every device:
Detailed description of the ALMEMO® system (manual section 1)
Overview of the device functions and measuring ranges (manual section 2)
All sensors with basic principles, operation, technical data (man. section 3)
The options for connecting existing sensors (manual section 4)
All analog and digital output modules (manual section .1)
The interface module RS232, fiber optics, Centronics (manual section .2)
The entire ALMEMO® networking system (manual section .3)
All functions and their control via the interface (manual section 6)
A complete interface command list with all print outputs (manual section 7)
These operating instructions only cover features and controls that are specific
for a certain device. As a result, many sections will often provide a note
referring to the more detailed description within the manual (man. sect. x.x.x).
4.1 Function Range of the ALMEMO 2690-8
The ALMEMO® 2690-8 data logger has electrically isolated measuring inputs
for all ALMEMO® sensors. Over 20 channels in the sensor connectors and 4
device internal function channels with more than 70 measuring ranges are pro-
vided with unlimited measuring possibilities. The device can be operated by
means of the LCD graphic display and a softkey keypad with cursor block.
User menus can be configured to adapt the display for any application. The
data logger function is carried out by a real time clock and a 12kB EEPROM
memory for approximately 100000 measured values. Two output sockets allow
for connecting any ALMEMO® output modules, for example, the analogue out-
put, digital interface, trigger input or alarm contacts. Several devices can be
networked by simply connecting them with network cables.
4.1.1 Sensor Programming
The measuring channels are automatically programmed by the ALMEMO®
8 ALMEMO 2690-8

Function Range of the ALMEMO 2690-8
connectors. However, the user can easily complete or modify the programming
via keyboard or via interface.
Measuring Ranges
There are corresponding measuring ranges for sensors with a non-linear
characteristic such as 10 thermocouple types, Ntc and Pt100 sensors, infrared
sensors, and flow sensors (rotating vanes, thermoanemometers, pitot tubes).
Humidity sensors are available with function channels that also calculate humi-
dity data such as dew point, mixture ratio, vapour pressure and enthalpy. Even
complex chemical sensors can be used. The acquisition of measured data
from other sensors is easily possible by using the voltage, current and resistan-
ce ranges with individual scaling in the connector. Existing sensors can be
used without problems. Only the corresponding ALMEMO® connector has to
be connected using its terminals. Furthermore, there are adapter connectors
with an own microcontroller for digital signals and for measuring frequencies
and pulses. This way, nearly all sensors can be connected to any ALMEMO
®
measuring instrument and are interchangeable without requiring any settings.
Function Channels
Maximum, minimum, average values and differences of certain measuring
junctions can be programmed as function channels, also in device internal
channels, and can be processed and printed like normal measuring junctions.
Furthermore, function channels for special measuring tasks are provided to de-
termine the temperature coefficient Q/DT and wet bulb globe temperature.
Dimension
The 2 digit dimension can be altered for each measuring channel so that the
display and the printout will always indicate the correct dimension, for example
when a transmitter is connected. The conversion from °C to °F is automatically
performed according to the dimension.
Name of Measured Values
For identification of the sensors a 10-digit alphanumeric name is provided. It is
entered via the keypad or the interface and appears on the display, the printout
or the computer display.
Correction of Measured Values
For correcting measured values a zero point and slope correction can be app-
lied to the measured value of each measuring channel. This also allows for
sensors to be interchanged that usually, at first, require an adjustment (expan-
sion, force, pH). The zero point and the slope correction are virtually performed
by the push of a button.
Scaling
The base value and the factor allow for a further scaling of the corrected mea-
ALMEMO® 2690-8 9

4. Introduction
sured value of each measuring channel for zero point and slope. The decimal
point position can be set by the exponent. By setting to zero and entering the
nominal value the scaling values can be automatically calculated.
Limit Values and Alarm
Two limit values (1 max and 1 min) can be set for each meas. channel. If a
limit value is exceeded alarm contacts, that can be individually allocated to limit
values, are provided by means of relay output modules. As a standard, the
hysteresis is set to 10 digits; however, it can also be adjusted between 0 and
99 digits. Furthermore, limit value exceeding can also be used to start or stop a
data logging.
Sensor Locking
All sensor data stored in the EEPROM of the connector can be protected
against undesired access by means of a graded locking function.
4.1.2 Measurement
A total of up to 20 meas. channels are available for transducers, i.e. it is also
possible to evaluate double sensors, individually scaled sensors, or sensors
with function channels. The meas. channels can be successively selected for-
wards or backwards via keypad. Normally, the selected meas. point is favou-
red, but all active meas. channels are also scanned in the background
(halfcontinously) with the conversion rate and output to the display or, if availa-
ble, to the analog output. To increase the response speed at many measuring
points, the conversion rate can be increased and set to continuous scan.
Measured Values
The measured values of 1 to 20 measuring points can be indicated on the dis-
play in different menus (that can also be configured) in three font sizes, as bar
graph or as line chart. They are automatically acquired with auto zero and self
calibration and can also be arbitrarily corrected and scaled as required. A sen-
sor breakage condition is, with most sensors, automatically detected.
Analog Output and Scaling
By means of analog start and analog end any measuring point can be scaled
so that the resulting measuring range covers the full range of the bar graph or
line chart or of an analog output (2V, 10V or 20mA). The measured value of
any measuring point as well as a programmed value can be output to the ana-
log output
Measuring Functions
Special measuring functions are required for some sensors to achieve an
optimal data acquisition. The cold junction compensation is available for
thermocouples, a temperature compensation for dynamic pressure and pH and
conductivity probes, and an atmospheric air pressure compensation for humidi-
ty sensors, dynamic pressure sensors and O2 sensors. With infrared sensors
the parameters zero point and slope correction are used for background tem-
perature and emissivity factor.
10 ALMEMO 2690-8