Ahlborn ALMEMO 2290-4 V5 User manual

Operating Instructions
Multifunctional
Measuring Instruments
ALMEMO®2290-4
with Option Data Logger
V1.3
04.12.2003
ALMEMO2290-4 1

Operating Instructions
Multimeter
ALMEMO®2290-4
with Option Data Logger
For reference with the ALMEMO®Manual
Table of Contents Page
1. INTRODUCTION 4
1.1 Function Range 4
1.2 Operating Controls 9
2. INITIAL OPERATION 11
3. POWER SUPPLY 12
3.1 Operation with Battery and Rechargeable Battery 12
3.2 External Voltage Supply 13
3.3 Switch On/Off, Reinitialisation 14
4. CONNECTION OF THE TRANSDUCERS 15
4.1 Transducers 15
4.2 Measuring Inputs and Additional Channels 15
5. DISPLAY AND KEYPAD 16
5.1 Display 16
5.2 Function Selection and Activation 18
5.3 Keypad 20
5.4 Data Entry 21
6. SENSOR PROGRAMMING 22
6.1 Selecting the Input Channel 22
6.2 Selecting the Measuring Range 22
6.3 Changing the Dimension 25
6.4 Limit Values 26
6.5 Correction Values 26
6.6 Scaling, Decimal Point Setting 27
6.7 Locking the Programming of the Sensor 28
2 ALMEMO2290-4
Table of Contents

Page
7. MEASUREMENT 29
7.1 Continuous Measurement of a Measuring Point 29
7.1.1 Selecting the Measured Value and Measuring Point 29
7.1.2 Memory for Momentary Values 30
7.1.3 Memory for Peak Values 30
7.1.4 Smoothing by Sliding Averaging 30
7.1.5 Averaging 31
7.1.6 Volume Flow Measurement 33
7.1.7 Setting the Meas. Val. to Zero, Zero Pt Corr., Sensor Adjustment 34
7.1.8 Atmospheric Pressure Compensation 35
7.1.9 Temperature Compensation 36
7.2 Single Measuring Point Scan 36
7.3 Cyclic Measuring Point Scan 37
7.3.1 Print Cycle, Continuous Measuring Point Scan 37
7.3.2 Time and Date 38
7.4 Data Memory (Option S Data Logger) 38
7.4.1 Memory Connector 39
7.4.2 Data Acquisition 40
7.4.3 Output of Measuring Data 40
8. ANALOGUE OUTPUT 41
8.1 Scaling 41
9. DIGITAL DATA OUTPUT 42
9.1 Baud Rate, Data Format 42
9.2 Output Formats for Lists of Measuring Data 42
9.3 Manual Data Output 43
9.4 Device Address and Networking 44
10. TROUBLESHOOTING 45
11. ELECTROMAGNETIC COMPATIBILITY 46
APPENDIX 47
Technical Data
Product Overview
ALMEMO2290-4 3
Table of Contents

1. INTRODUCTION
The multimeter ALMEMO®2290-4 V5 is an instrument from the unique product
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 EEPROM within the
connector. As a result, the programming that usually has to be performed for
the connection is not required.
All sensors and output modules 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 analogue and digital output modules (manual section 5.1)
The interface module RS232, fiber optics, Centronics (manual section 5.2)
The entire ALMEMO®networking system (manual section 5.3)
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, the sections dealing with the system control via
keyboard will only often provide a note referring to a more detailed description
within the manual (manual section x.x.x).
1.1 Function Range
The multimeter ALMEMO®2290-4 has two electrically isolated measuring
inputs with 8 channels for more than 65 measuring ranges. Two output sockets
allow for connecting any ALMEMO®output modules, for example, the analogue
output, digital interface, trigger input or alarm contacts. By simply connecting
devices using network cables, several devices can be networked. For easy
operation a keypad and an 8½-digit LCD display has been integrated. A data
logger function with an internal 30kB memory or with external connectors up to
256kB (50,000 measured values) is available.
The measuring instruments have many functions for an optimal evaluation of all
sensors, flexible process control and universal data output. To avoid a difficult
operation resulting from functions that are not required, it is possible to
automatically or individually activate functions, as required. A range of special
functions can only be accessed via the interface.
4 ALMEMO2290-4
Functions

SENSOR PROGRAMMING
The measuring channels are automatically programmed by the ALMEMO®
connectors of the sensors. However, the user can easily complete or modify the
programming via keypad 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
humidity 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 voltage, current and
resistance 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 and can be processed and
printed like normal measuring junctions. Furthermore, a function channel for
special measuring tasks is provided to determine the 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
Sensors can be identified by a 10 digit alphanumeric designation. It is entered
via the interface and appears on the printout or display if the evaluation is done
via PC.
Correction of Measured Values
For correcting measured values a zero point and slope (gain) correction can be
applied to the measured value of each measuring channel. This also allows for
sensors to be interchanged that usually, at first, require an adjustment
(expansion, force, pH). The zero point and the slope (gain) correction are
virtually performed by the push of a button.
ALMEMO2290-4 5
Functions

Scaling
The base value and the factor allow for a further scaling of the corrected
measured value of each measuring channel for zero point and slope (gain). 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 measuring channel. An
alarm value printout can be performed if a limit value is exceeded and, by
means of relay output modules, alarm contacts are provided that can be
individually allocated to limit values. As a standard, the hysteresis is set to 10
digits, however, it can also be adjusted. 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.
MEASUREMENT
A total of up to 4 measuring channels are available for each transducer, i.e. it is
also possible to evaluate double sensors, individually scaled sensors, or
sensors with function channels. The measuring channels can be successively
selected forwards or backwards via keyboard. The selected measuring point
can be scanned with a conversion rate of 2.5 or 10 measurements/second. The
measured value is calculated and indicated on the display or, if available,
provided on the analogue output.
Measured Value
A continuous presentation of measuring data from the selected measuring point
is provided and also includes automatic zero point correction and optional
correction of the measured value or new scaling.
A sensor breakage condition is, with most sensors, automatically detected
(exception: connectors with shunts, dividers or additional electronics).
Measuring Functions
Special measuring functions are required for some sensors in order to achieve
an optimal acquisition of measuring data. 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 humidity sensors, dynamic pressure sensors and O2sensors.
With infrared sensors the parameters zero point and slope correction are used
for background temperature and emissivity factor.
Analogue Output and Scaling
By means of analogue start and analogue end the indicated measured value
can be scaled so that the resulting measuring range covers the full analogue
output range (2V, 10V or 20mA).
6 ALMEMO2290-4
Functions

Memory for Momentary Values
The measured value can be frozen by the push of a button (hold function).
Maximum and Minimum Value
Each measurement involves an acquisition and storing of the maximum and
minimum value. These values can be displayed, printed or cleared.
Average Value of a Channel
A manual averaging over a particular period or over single measurements is
available for the selected channel.
Volume Flow Measurement
Apart from the averaging functions all flow sensors also provide functions for
the input of the cross-sectional area or diameter of ventilating ducts and for
calculating the volume flow. The average flow velocity can be roughly
determined by proceeding uniformly over the whole cross-sectional area or by
exact net measurements according to DIN. Both, a temperature and
atmospheric pressure compensation are available for dynamic pressure
probes. In case of corresponding environmental conditions the values can be
manually entered or automatically measured.
PROCESS FLOW PROGRAMMING
A cyclic measuring point scan with a time-based process flow control is
required to digitally register measuring data of all connected sensors. For this
purpose, a real time clock, the print cycle and the measuring cycle are available
and, if fast processing is required, the conversion rate is available. The
measurement can be started and stopped by using the keyboard, the interface,
an external trigger signal, the real time clock or an exceeding of limit values.
Time and Date
The real time clock with date function or the pure measuring time is used for
the recording of any measurement.
Print Cycle
The print cycle is programmable between 1s and 59h/59min/59s. It provides a
cyclic storing and output of measured values to the interfaces as well as a
cyclic averaging.
Print Cycle Factor
If necessary, the print cycle factor allows for limiting the data output of particular
channels so that an excessive data flow can be limited.
Average Value over Measuring Point Scans
The measured values that result from scanning the measuring junctions can be
averaged as desired either over the total measuring time or over the print cycle
time. Function channels are provided for a cyclic output of average values.
ALMEMO2290-4 7
Functions

Conversion Rate
With ALMEMO®
V5 devices, all measuring points can be continuously scanned
with the conversion rate (2.5 or 10 meas./s). It is also possible to store all
measured values in the memory and/or to perform an output via the interface.
Data Memory (Option S)
All measured values or alarm values only can manually, cyclic or by using the
conversion rate be stored in a 30kB internal, buffered RAM, which is sufficient
for 6000 measured values. The memory organisation can be configured as
linear or ring memory. External ALMEMO®connectors with 128kB (25,000
meas. values) or 256kB (50,000 meas. values) EEPROM memory are available
as alternative storage options. The measurement can be automatically stopped
and started with time and date. The individual connectors allow for an easy
management of different records and, if required, for readout from a computer
when using a separate readout interface. A selection referring to a time interval
or alarm value is possible when data is output via interface.
Control Outputs
The interface allows to individually trigger up to four external output relays and
one analogue output.
Output
All measuring and programming data is accessible by means of the LCD
display. RS232, RS422, RS485 and a Centronics interface are available by
using different interface cables. All data logs, measured values and
programmed parameters can be provided as output to any peripheral
equipment. The output of measuring data can be selected in list format,
columns or spreadsheet format. Files in spreadsheet format can be processed
by each spreadsheet software. The print header can be programmed
specifically to the company or application.
Networking
All ALMEMO®devices can be addressed and can be easily networked by a
simple connection with network cables or network junctions for longer
distances.
Software
The AMR-Control software, which allows for the entire programming of the
sensors, the configuration of the measuring instrument and the read-out of the
data memory is supplied with each ALMEMO®manual. The integrated terminal
also allows for online measurements with data storage in the computer. The
WINDOWS®software packages, Win-Control and DATA-Control, are available
for data acquisition of networked devices, graphical presentation and complex
data processing.
8 ALMEMO2290-4
Functions

1.2 Operating Controls
(1) ON/OFF Switch
up ON
down OFF
(2) Measuring Inputs M0, M1
M0, M1 for all ALMEMO®sensors
M2 to M7 additional channels
(3) Output Sockets A1, A2
A1 V24 Interface (ZA 1909-DK5)
V24 Fiber Optics (ZA 1909-DKL)
Ethernet (ZA 1945-DK)
Centronics (ZA 1936-DK)
RS 422 (ZA 5099-NVB)
Relay Trigger Cable (ZA 1000-EAK)
Analogue Output 1 (ZA 1601-RK)
A2 Memory Connector (ZA 1904-SS)
Network Cable (ZA1999-NK5)
Trigger Input (ZA 1000-ET)
Relay Outputs (ZA 1000-EGK)
Analogue Output 2 (ZA 1601-RK)
(4) DC Socket
Mains Adapter (ZB 2290-NA, 12V, 200mA)
Cable, electr. isol. (ZB 2290-UK, 10-30V)
(5) LCD Display
(6) Function Keys
(7) Battery Box (back of unit)
Alkaline mangan. battery 9V (6F22)
Space or spare battery
(5) LCD Display
(a) Symbols for operating conditions
U battery < 7 V
BAT
▲ CORR Correction of meas. value
▲ Averaging
M
▲ START Measuring point scan
▲ MEM Data Memory
▲ COM Output of meas. value
▲ ALARM Exceeding of limit value
▲ FFunction
(b) 6½ x 7 segment display for:
Meas. point, meas. value, meas.
range, meas. and progr. values,
cycles, time, date
(c) 2 x 16 segment display for:
Dimension of the measured value,
abbreviation for functions
ALMEMO2290-4 9
CORR M START COM
MEM ALARM F
a
bc
Operating Controls
(1) (3)
(4)
(5)
(6)
(7)
(2)

(2) FUNCTION KEYS
START/ M M/
▲F1
CLEAR ▲▼
F2
PROGR
▼ +/-
STOP HOLD
PROGR, +/-,▲▼, for entering programming values
▲
PROGR, CLEAR clear data, set meas. value to zero
PROGR, +/- calibrate measured value
START/STOP cyclic measuring point scan
M ▲select measuring point
M/HOLD select measuring point, hold
F1 select measuring functions
max value (Hi) MH
min value (Lo) ML
free memory MF #
print cycle PC *
average value AV +
number of averaged values C+
time constant s+
volume flow V+
time TM *
date DA *
start time ST #
start date SD #
end time ET #
end date ED #
F2 selecting programming functions
display mode DM
range R
averaging mode AM +
cross-sectional area CS +
diameter, normalized DN +
atmospheric pressure mb ~
temperature compensation TC "
locking mode LM
limit value Max (Hi) LH
limit value Min (Lo) LL
Functions are activated by: zero point correction ZC "
All by switch-on with key PROGR slope (gain) correction SC "
Groups via display mode ambient temperature AT ^
Individually by interface command emissivity factor EF ^
Switch-on with key CLEAR base value BA
#Option S Data Logger factor FA
* Interface module exponent EX
+Flow sensors (Dim=m/s) analogue output start AS
^ Infrared sensors (IR-Flag) analogue output end AE
" pH probes (Dim=pH) baud rate, output format BR *
~Humidity, dynam. pressure, O2sensors device address A*
10 ALMEMO2290-4
Operating Controls

2. INITIAL OPERATION
1. Connect transducers to the sockets M0 and M1 (2), see 4.
2. Ensure power supply with 9V battery or mains adapter, see 3.1, 3.2.
3. For switching on move the slide switch (1) on the left side of the unit to the
upper position, see 3.3.
4. For displaying the measured values:
select function MEAS. VALUE with key M/HOLD (6),
select the measuring channels with key M▲, read the meas. values, s. 7.1.1.
5. For cyclic output of measured values to printer or computer:
connect peripheral device via interface cable to socket A1, see man. 5.2,
set 9600 bd, 8 data bits, 1 stop bit, no parity at peripheral device, see 9.1,
enter correct time and date, as required, see 7.3.2,
use the key F1 to select the function PRINT CYCLE ´PC´ and program the
print cycle, see 7.3.1,
use key M▲ to select the output format in function BAUDRATE ´BR´, s. 9.2,
use key START/STOP to start and stop the cyclic measuring point scan, s. 7.3.
6. For storing the measured values (only with option S):
use the key F1 to select the function PRINT CYCLE ´PC´ and program the
print cycle, see 7.3.1,
enter correct time and date, as required, see 7.3.2,
use key START/STOP to start and stop the recording of measuring data, s. 7.3.
For output of memory data to printer or computer:
connect peripheral device via interface cable to socket A1, see man. 5.2,
set 9600 bd, 8 data bits, 1 stop bit, no parity at peripheral device, see 8.1,
use key M▲ to select the output format in function BAUDRATE ´BR´, s. 9.2,
use key START/STOP to output measured values in function ´MF´, see 7.4.3.
7. For evaluating the measurement:
use key F1 to select the function MAX VAL ´MH´ or MIN VAL ´ML´ and recall
the max and min values, s. 7.1.3.
ALMEMO2290-4 11
Initial Operation

3. POWER SUPPLY
The following options are available for the power supply of the instrument:
9V battery IEC 6 F22 ZB 2000-B9
9V rechargeable battery,
as above with charger unit integrated in plug ZB 2000-A9, ZB 2000-LS
Mains adapter 12V/200mA ZB 2290-NA
External power supply, connecting cable ZB 2290-UK
Our product line includes corresponding accessories.
3.1 Operation with Battery and Rechargeable Battery
Only use type IEC 6 F22 alkaline manganese batteries. At a current
consumption of approximately 7mA, they last for an operating time of 50 hours.
The operating time will be shortened if sensors or modules are connected that
consume additional current.
Inserting Batteries:
The battery box (7) is located at the underside of
the instrument.
1. Press the area that is marked with the arrow and,
at the same time, pull as marked by the arrow, as
illustrated left.
2. Use the connector clip to connect the battery. The
connector shape prevents from confusing the
poles.
3. Use the second battery box to store a spare
battery.
Battery Control:
If the battery warning symbol is illuminated in the
display the battery will still operate for approx. 5 hours
(supply voltage <7V)
If the battery voltage drops below 6 volts ´ LobAt ´ will
be indicated on the display.
The battery should be immediately removed. Leakage
of the battery and damage to the instrument can then
be avoided.
The actual battery voltage can be accurately monitored with an own
measuring channel Ubat and the remaining battery life can be
estimated accordingly.
12 ALMEMO2290-4
Power Supply

Tips regarding correct handling of batteries:
Do not leave used batteries in the instrument!
Remove batteries from the instrument if it is not used for a long period.
Risk to health and instrument failure can result from leaking batteries!
Therefore, only use leak-proof batteries.
Used batteries are hazardous waste and must be disposed in an
environmentally friendly way! Return them to the dealer or dispose of
them in a battery storage container.
Operation with rechargeable batteries:
Rechargeable batteries can be used instead of normal batteries. Due to their
smaller capacity of 110mAh they only reach an operating time of 16 hours. The
operating time will be shortened if sensors or modules are connected that
consume additional current. It is recommended to use the 9V rechargeable
battery with plug-integrated charger unit ZB 2000 LS, which is included in the
range of accessories.
Tips regarding correct handling of rechargeable batteries:
The rechargeable batteries supplied are not charged when delivered!
Therefore, they must at first be charged.
If NiCd cells are only partly discharged, the full capacity cannot be
reached by a normal recharging. Therefore, use the instrument until the
rechargeable battery is almost completely discharged and then
completely re-charge the battery again. As a result, the life of the
rechargeable batteries is significantly increased.
Completely recharged batteries will slowly discharge when they are not
being used and during storage. Therefore, they should be checked at
least once per month so they cannot suffer damage from deep
discharge.
3.2 External Voltage Supply
For an external voltage supply the connector socket (4) is located at the right
side of the device. The range of accessories includes the mains adapter ZB
2290-NA (12V/200mA). However, any other DC voltage source (7 to 13V) can
also be used. The connection is performed by a low-voltage connector (NES1
according to DIN 42323, centre pin to negative).
The electrically isolated supply cable ZB 2290-UK must be used if an electrical
isolation between power supply and transducers is required or if a larger input
voltage range is required. It allows to operate the measuring instrument with
12V or 24V mains supply.
If a battery is used in addition it will take over the power supply
if the voltage drops under 9V.
ALMEMO2290-4 13
Power Supply

3.3 Switch On/Off, Data Storage, Reinitialisation
The ON/OFF switch (1) on the left side of the device has three positions:
up: ON
down: OFF
For switch-on the slide switch (1) on the left side must be moved upwards.
The device is switched off when the slide switch s moved to the lower position.
Data Storage
When the instrument is switched off the real time clock continues its operation
and the stored data is maintained as long as the available voltage of the 9V
battery is above 6V. When changing the battery the residual voltage is sufficient
for at least one minute. If the new battery is connected within that period no
data will be lost. Otherwise, a reinitialisation must be performed.
Reinitialisation
If the battery supply has been interrupted or if the device is not functioning
properly due to disturbances (e.g. electrostatic charging or wrong connection of
peripherals) or if incorrect programming must be avoided, the instrument can
be reinitialised.
The reset can be achieved if the key CLEAR is pressed during switch-on. During
this process the measuring data, time and date, as well as all internal data such
as cycles, conversion rate, atmospheric pressure and function key assignment,
will be deleted or set to their default values. However, the device configuration
and the sensor programming within the ALMEMO®connectors will not be
affected by the reset.
14 ALMEMO2290-4
Power Supply

4. CONNECTION OF THE TRANSDUCERS
Any ALMEMO®sensors can be connected to the ALMEMO®input sockets (2)
M0 and M1. For connecting existing sensors it is only necessary to connect a
corresponding ALMEMO®connector.
4.1 Transducers
A detailed description of the comprehensive ALMEMO®sensor range (see
manual section 3) and the connection of existing sensors (see manual section
4) to the ALMEMO®instruments are provided in the ALMEMO®manual. All
standard sensors with ALMEMO®connector usually have the measuring range
and dimension already programmed and can be immediately connected to any
input socket. A mechanical coding ensures that sensor and output modules can
only be connected to the correct sockets. Furthermore, each ALMEMO®
connector has two locking levers that snap in when the insertion into the socket
is established and that prevent a disconnection caused by pulling the cable.
Both levers must be pressed on the sides for disconnecting the connector.
4.2 Measuring Inputs and Additional Channels
The measuring instrument ALMEMO®2290-4 has 2 input sockets (2), M0 and
M1 that the measuring channels M0 and M1 are initially allocated to. However,
ALMEMO®sensors can, if required, provide up to 4 channels so that 20
channels are available with 5 input sockets. The additional channels can be
especially used with humidity sensors with 4 measuring variables
(temperature/humidity/dew point/mixture ratio) or used for function channels. If
required, the sensor can also be programmed with several ranges or scalings
or, depending on the pin assignment, 2 or 3 sensors can be combined in one
connector (e.g. rH/Ntc, mV/V, mA/V etc.). The additional measuring channels of
a connector are located one level higher each. As a result, the following
channel assignment is available.
01
23
45
67
chann.1
chann.2
chann.3
chann.4
M0 M1 A2 A1
2290-4
ALMEMO2290-4 15
Connection of the Transducers

Both analogue inputs of the ALMEMO®2290-4 are electrically
isolated by using photovoltaic relays and a potential difference
of 50V DC or 60V AC, at maximum, is permissible between
them. However, sensors combined within one connector and
sensors with an own power supply are electrically connected to
each other and must, therefore, be operated in isolation. The
voltage applied to the measuring inputs must not exceed ±5V
(between B,C,D and A or - respectively).
The cold junction compensation for thermocouple measurement is integrated in
socket M0 of the device.
5. DISPLAY AND KEYPAD
5.1 Display
The display (5) of the instrument ALMEMO®2290-4 consists of an LCD module
with six and a half 7-segment digits, two 16-segment digits, and a battery
symbol and seven arrows for indicating the operating status.
CORR START MEM COM ALARM F
M
M MIN SEC DIM/F
Measuring Data Display
After switching on, the measured value is indicated with the measuring point M
and the dimension DIM of the previously selected channel.
Meas. point, meas. value and dimension: 0: 23.4° C
Function Display
The keys F1 and F2, depending on their activation, can be used to select
various function parameters (see 5.2).
Channel, function value, function: 0: 29.7M H
16 ALMEMO2290-4
Display and Keypad

Double Display for Temperature and Humidity
If a double sensor for temperature and humidity is connected to socket M0 the
display can be switched to display both variables. To achieve this, the channel
M2 for humidity must be selected and key M/HOLD must be pressed longer
than one second. The same keys are also used to undo the function again.
Select humidity channel:
M▲
2: 34.5% H
Double display with key:
M/HOLD
1s 23.4°C 34.5%
The double display will be maintained when returning to channel 2 and also
when other channels or function parameters are selected in standard format.
Special Operating Conditions
Segment test of the display automatically after switch-on.
Supply voltage: lower than 7 V: symbol is illuminated
BAT
lower than 6 V: 1:L o b A t
Sensor that are not connected,
deactivated measuring points,
cleared programming values.
Sensor correction or scaling arrow CORR illuminated
Measuring point scan in progress arrow START illuminated
Averaging in progress arrow illuminated
M
Data memory active arrow MEM illuminated
Measuring point scan with output arrow COM illuminated
Function selected arrow Filluminated
Alarm Conditions
are displayed as follows and cause an alarm (see man. 6.3.9):
Sensor breakage: abbr. flashes
1: N i C r °C
Exceeding of limit value: arrow ALARM is illuminated
Overshooting of measuring range: maximum value flashes
Undershooting of measuring range: minimum value flashes
Undershoot. of meas. range CJ compens. (cold junction)
Meas. without ext. CJC or CJC breakage: flashes
Exceeding of range of values (>65000): flashes
1:6 5 0 0 0
1: - - - -XX
1: C J
ALMEMO2290-4 17
Display and Keypad

5.2 Function Selection and Activation
After a reinitialisation (see 3.3) the function group 1 is selected (see below) and,
at first, the functions max value and min value are available with key F1, and the
measuring range is available with key F2. However, in addition to these basic
functions the instrument ALMEMO®2290-4 also provides a large number of
further functions for scaling and correcting sensors, implementing automatic
measuring point scans, averaging, monitoring, storing and also providing
outputs of measured values to peripheral devices.
However, as it is usually not necessary to have all functions available but some
with certain sensors and others only for data outputs etc., the functions can be
activated for specific applications by different methods. They can be
automatically activated via sensors or output modules (see below) or activated
individually by selecting a function group in display mode or via interface. This
ensures a quick access by using the keys F1 and F2 and it reduces the risk of
incorrect inputs.
The active functions are selected by repeatedly operating the keys F1 or F2. If
the key is pressed for longer than one second it is possible to switch back to
the previous function. The functions can be identified by a 2-digit abbreviation in
place of the dimension, as follows:
F1 Meas.Functions Function Access F2 Programming Values Function Access
Function Group: 0123456789 0123456789
Max Value (Hi) MH Display Mode DM 0 1 2 3 4 5 6 7 8 9
Min Value (Lo) ML Range R
Memory Free MF # # # # # # Averaging Mode AM ++
Print Cycle PC *
#* #* #Cross-Sectional Area CS +++++
Average Value AV + + Diameter, Normalized DN +++++
Count of Avg. Val. C+ + Atmospheric Pressure mb ~~~~~
Time Constant s+ + + + Temp. Compensation TC °°°°° °
Volume Flow V+ + + + + Locking Mode LM
Time TM * Limit Value Max (Hi) LH
Date DA * Limit Value Min (Lo) LL
Start Time ST ## # Zero Point Correction ZC """
Start Date SD ## # Slope (Gain) Correction SC """
End Time ET ## # Ambient Temperature AT ^^ ^ ^
End Date ED ## # Emissivity Factor EF ^ ^ ^ ^
Automatic Activation by:
#Option S Data Logger
* Interface Modules
^ Infrared Sensors (Elementflag = Ir)
+Flow Sensors (Dim = m/s)
" pH Probes (Dim = pH)
° Probes for Dyn. Pressure and pH
~Humidity, Dyn.Press., O2Sensors
Base Value BA
Factor FA
Exponent EX
Analog Output-Start AS
Analog Output-End AE
Baud Rate,Output Format BR *****
#* #* #
Device Address A
18 ALMEMO2290-4
Display and Keypad

Activation of Function Groups
As shown in the previous table it is possible to set 10 different function groups
that release the corresponding functions (grey background). The applications
range from an almost entirely locked instrument to the release of all functions.
F Group Application MEASUREMENT:
0 Locked: no input, only single measuring point scan,
Meas. value without hold, max/min without clear, range indication
1Basic
Setting:
Start/stop, meas.val./hold, max/min, range usually locked
Option S: memory, print cycle
2 Man. meas., as above, with zero-setting and sensor adjustment
3 Man. averaging (for sensors without dimension m/s)
4 Cyclic measurement with averaging, limit value monitoring
5 as above, with sensor adjustment
Option S: start/stop with start/end time/date
6 only functions that have been defined by the user via interface
Application PROGRAMMING:
7 Sensor/connector programming
8 Device programming
9 All functions
After a reinitialisation (key CLEAR must be pressed when switching on) the
function group 1 is selected. The selection of another function group can be
performed in the function display mode. The (slightly difficult to access)
DISPLAYMODE ´DM´ can be accessed by using the key F2 to select the function
RANGE ´R´ and once again by pressing the key F2 for a longer period.
Function DISPLAYMODE ´DM´
,Key
F2
1: N i C r R
F2
1s d - 1 DM
Input, see 5.4
Example: German - Function Gr.1
The letter that precedes the function group indicates the language setting:
d = German, E = English, F = French
Activation via Interface
In function group 6, it is possible to use the interface (e.g. AMR-Control) for
allocating the required functions, as required, and without an automatic
activation to the keys F1 and F2. As a result, the key assignment can be
completely configured (see man. 6.10.13.3).
Furthermore, it is also possible to temporarily activate all functions by pressing
the key PROGR during switch-on.
ALMEMO2290-4 19
Display and Keypad

In the display the function value is indicated next to the function abbreviation. If
sensor parameters are indicated the channel number will also be included:
Meas. Functions F1 Abbr. Programm. Functions F2 Abbr.
Display Mode d-1 DM
Max Value (Hi) 1:127.3MH Range 1: NiCr R
Min Value (Lo) 1:023.4ML Averaging Mode 1:StStP AM
Memory (Option S) 01:113.2MF Cross-Sectional Area 1:0175.CS
Print Cycle 00:15:00 PC Diameter, normalized 1: 0150.DN
Average Value 1:13.24 AV Atmospheric Pressure 1013 mb
Count of Avg. Val. 1:1234 C Temperature Compens. 1: 023.4TC
Time Constant 00 ZC Locking Mode 1: 0005 LM
Volume Flow 1:0834.V Limit Value Max (Hi) 1: 123.0LH
Time 12:34:56 TM Limit Value Min (Lo) 1: -010.0LL
Date 01.12.99 DA Zero-Point Correction 1:---- ZC
Start Time 10:00:00 ST Ambient Temperature 1: 250.0AT
Start Date 01.12.99 SD Slope (Gain) Correction 1: ---- SC
End Time 17:00:00 ET Emissivity Factor 1: 0.950 EF
End Date 02.12.99 ED Base Value 1:---- BA
Factor 1:---- FA
Exponent 1:0 EX
Analogue End 1:123.4AE
Analogue Start 1:000.0AS
Baud Rate Un 9600 BR
Device Address 00 A
5.3 Keypad
The keyboard (6) has the following functions that are displayed above the keys:
Function Normal Input
Start and stop of meas. point scans START / STOP
▲
PROGR
Selection of measuring points M ▲CLEAR
Measured value M / HOLD +/-
Selection of the measuring functions F1 ▲
Selection of the programming functions F2 ▼
20 ALMEMO2290-4
Display and Keypad