Ahlborn ALMEMO 2390-1 User manual

Operating instructions
Universal measuring instrument
ALMEMO®2390-1
V1.1
07.01.2004
ALMEMO2390-1 1

Operating instruction
Universal Measuring Instrument
ALMEMO®2390-1
With supplementary reference to the ALMEMO®-Manual
Table of contents
Page
1. INTRODUCTION 3
1.1 Functions 4
1.2 Operating controls 6
2. PUTTING INTO SERVICE 7
3. POWER SUPPLY 7
3.1 Battery / rechargeable battery operation 7
3.2 External voltage supply 9
3.3 Switching ON and OFF 9
4. CONNECTING THE SENSORS 9
4.1 Sensors 9
4.2 Measuring inputs and additional channels 10
5. DISPLAY 11
6. SENSOR PROGRAMMING 12
6.1 Measuring range 12
6.2 Dimensions 14
7. MEASURING OPERATIONS 14
7.1 Measured values and selection of measuring point 14
8. TROUBLE-SHOOTING 15
9. ELECTROMAGNETIC COMPATIBILITY 16
APPENDICES 17
Technical data 17
Product overview 17
2 ALMEMO2390-1
Table of contents

1. INTRODUCTION
The universal measuring instrument ALMEMO®2390-1 is member of a truly
unique product family
- all equipped with the ALMEMO®connector system, patented by Ahlborn
Mess- und Regelungstechnik GmbH. The intelligent ALMEMO®connector of-
fers decisive advantages when connecting sensors and peripherals because
all parameters are stored in an EEPROM on the connector itself; repeat pro-
gramming is thus no longer necessary.
All sensors and output modules can be connected to all ALMEMO®measuring
devices - all in the same way. Programming and functioning are identical for
all units. The following points apply to all devices in the ALMEMO®measuring
system;
they are described in detail in the ALMEMO®Manual supplied with each device
:
Detailed description of the ALMEMO®system (Manual, Section 1)
Overview of the device functions and measuring ranges (Manual, Section 2)
Basic principles, operating instructions, technical data for all sensors
(Manual, Section 3)
Options for connecting your own existing sensors (Manual, Section 4)
All analog and digital output modules (Manual, Section 5.1)
Universal measuring instrument ALMEMO®2390-1, unlike the other family
members, does not incorporate an interface;
i.e. those sections of the Manual listed below concerning connection to and use
of the interface do not apply. However, the sensor functions themselves, provi-
ding the sensor connectors have been suitably programmed, do apply.
Interface modules RS232, optic fiber, Centronics (Manual, Section 5.2)
The entire ALMEMO
®
networking system (Manual, Section 5.3)
All functions and their operation via the interface (Manual, Section 6)
Complete list of interface commands with all the print outputs
(Manual, Section 7)
These operating instructions only cover features and controls that are specific
to this device.
ALMEMO2390-1 3
Introduction

1.1 Functions
Universal measuring instrument ALMEMO®2390-1 is a simple measuring in-
strument with just one measuring input (maximum 2 channels); it does not ha-
ve its own integrated programming facility. However, any programmed ALME-
MO®sensor can easily be connected to it and the measured values plus units
can be read out on the LCD.
It is also possible, as and when required, to connect an analog output module
to the output socket and evaluate measured values using e.g. a chart recorder
or plotter.
SENSOR PROGRAMMING
The measuring channels are automatically and completely programmed by the
ALMEMO®sensor connectors. The ALMEMO®2390-1 cannot be used to mo-
dify the programming but it is possible to do so using one of the many other
ALMEMO®devices incorporating an input facility. The ALMEMO®2390-1 does,
however, support all sensors programmed in this way without restriction.
Measuring ranges
For all sensors with a non-linear characteristic, e.g. 10 thermocouple types, Ntc
and Pt100 sensors, infrared sensors, and flow sensors (rotating vanes, ther-
moanemometers, Pitot tubes), the appropriate measuring ranges are available.
For humidity sensors, additional function channels are available that also
calculate humidity variables such as dew point, mixture ratio, vapor pressure,
and enthalpy. Even complex chemical sensors are supported. Measured valu-
es from other sensors can also be acquired using the voltage, current, and re-
sistance ranges with individual scaling in the connector. Existing sensors can
also be used without difficulty - so long as the appropriate ALMEMO®connec-
tor is connected via its screw terminals. For digital input signals and frequen-
cies, adapters are available with an integrated microcontroller. It is thus pos-
sible to connect virtually any sensor to any ALMEMO®measuring instrument
and to interchange these without the need for any extra settings.
Units
There are two 16-segment displays; these always indicate the physically cor-
rect units for the ALMEMO®sensor in question. Conversion between °C and
°F is performed automatically.
MEASUREMENT
For each transducer up to two measuring channels are available; i.e. it is also
possible to evaluate double sensors, individually scaled sensors, and sensors
with function channels. The selected measuring point is scanned at a conver-
sion rate of 2.5 measuring operations per second; the measured value is
calculated and output to the display and, if available, to an analog output.
4 ALMEMO2390-1
Functions

Measured value
The measured value for the selected measuring point is shown continuously
with auto zero and, as and when necessary, with measured value correction.
With most sensors, sensor breakage is detected automatically (except for con-
nectors with shunt, divider, or additional electronics).
Measuring functions
With some sensors, to achieve optimal data acquisition, special measuring
functions are required. Cold junction compensation is available for thermocou-
ples; temperature compensation is available for dynamic pressure, pH, and
conductivity probes. With infrared sensors the parameters for zero point and
slope correction are used as the background temperature and emissivity fac-
tor.
External sensor programming
All sensor programming is supported so long as the sensors have been pro-
grammed at the factory or using some other suitable ALMEMO®device.
Units
The 2-character units display can be changed for each measuring channel so
that the display always indicates the correct units, e.g. when a transmitter is
connected.
Correction of measured values
The measured value on each measuring channel can be corrected in terms
both of zero point correction and slope (gain) correction; this means that even
sensors usually requiring initial adjustment (expansion, force, pH) can be freely
interchanged.
Scaling
The corrected measured value on each measuring channel can also be further
scaled in terms of zero point and slope (gain) - using the base value and factor.
The decimal point position can be set with the exponent.
Analog output and scaling
The displayed measured value can, by means of analog start and analog end,
be scaled in such a way that the associated measuring range covers the full
analog output range (2 V, 10 V, or 20 mA).
ALMEMO2390-1 5
Functions

1.2 Operating controls
(1) ON/OFF switch
up : ON, measuring point M10
middle : ON, measuring point M00
down : OFF
(2) Measuring input M0
for all ALMEMO®sensors
M0 1st measuring point
M10 2nd measuring point
(3) Output socket A1
Analog output (ZA 1601-RK)
(4) Socket DC
Mains adapter (ZB 2290-NA, 12 V, 200 mA)
Connecting cable (ZB 5090-EK, 7-13 V DC)
Cable, electrically isolated
(ZB 2290-UK, 10-30 V)
(5) LCD display
(6) Battery compartment
(rear of device)
9-volt alkaline-manganese battery (6F22)
Space for reserve battery
(5) LCD display
(a) Symbols for operating states
Battery voltage <7 V
BAT
▲ CORR Correction of measured
values
(b) 6x7 segment display for :
measuring point, measured value
(c) 2x16 segment display for :
units for measured value
6 ALMEMO2390-1
Operating controls
(1) (2) (3)
(4)
(5)
(6)
CORR
a
bc

2. PUTTING INTO SERVICE
1. Connect transducer to socket M0 (2); (see Section 4).
2. Provide power supply via 9-volt battery or mains adapter;
(see Section 3.1, 3.2).
3. To switch on, push the slide switch (1) located on the left side of the de-
vice one position upwards; (see Section 3.3); then read the measured value;
(see Section 7.1).
4. To select the 2nd measuring channel M10, push the slide switch (1) to its
uppermost position, then read the measured value; (see Section 7.1).
3. POWER SUPPLY
As power supply for the measuring instrument there are the following possibili-
ties :
9V Batterien IEC 6 F22 ZB 2000-B9
9-volt batteries IEC 6 F22 ZB 2000-B9
9-volt rechargeable battery pack, same
with charger integrated in the connector ZB 2000-A9, ZB 2000-LS
mains adapter 12 V / 200 mA ZB 2290-NA
external power supply, connecting cable ZB 2290-UK
Our product spectrum includes all the appropriate accessories.
3.1Battery / rechargeable battery operation
Use only alkaline-manganese batteries, type IEC 6 F22. At a current consump-
tion of around 4.5 mA, these last for an operating time of approx. 80 hours. If
sensors or modules also requiring power are connected, the operating time will
be accordingly shorter.
Inserting the batteries :
The battery compartment (6) is located under-
neath the device.
1. Press on the spot marked with the arrow and
at the same time pull in the direction shown by the
arrow (as shown in the illustrations).
2. Connect the battery using the clip. Accidental
reverse polarity is prevented by the shape of the
connections.
3. Use the second battery compartment to store
a reserve battery.
ALMEMO2390-1 7
Putting into service

Battery check :
If the battery symbol in the display lights up, this me-
ans that the battery will last for approximately another
5 hours. (Supply voltage <7 V)
In the event of the battery voltage falling below 6 volts,
the display shows the message ‘LobAt’.
In this event the battery must be removed immediately.
This prevents the battery from leaking and thus dama-
ging the device.
The current battery voltage can be checked by removing the
sensor or by releasing the 2nd measuring channel.
Tips on the correct handling of batteries:
Never leave used dead batteries in the device !
If the device is likely to be unused for a relatively long time,
remove the batteries !
A leaking battery represents a health hazard and may also
destroy the device. Use only leak-proof batteries !
Spent batteries are special waste and must be disposed of in an envi-
ronmentally acceptable way. Take spent batteries back to your dealer or
dispose of them in your local battery collection container !.
Rechargeable battery operation:
Instead of the standard batteries you can use rechargeable battery packs.
Rechargeable batteries are of lower capacity, and provide an lower operating
time. If sensors or modules also requiring power are connected, the operating
time will be accordingly shorter. From our range of accessories we recom-
mend the 9-volt rechargeable battery with a charger integrated in the connec-
tor, ZB 2000 LS.
Tips on the correct handling of rechargeable batteries:
The rechargeable batteries supplied are not usually charged
when delivered.
If NiCd cells are only partly discharged, normal recharging
will not restore them to full capacity.
Use the device until the batteries are nearly totally discharged.
Then recharge the batteries completely.
This will significantly prolong the life of your rechargeable batteries.
Even fully charged batteries discharge in storage without being used.
8 ALMEMO2390-1
Power supply

3.2 External voltage supply
On the right side of the device there is a socket (4) for connecting an external
power supply. In our range of accessories we offer a mains adapter ZB
2290-NA (12 V / 200 mA). Or, alternatively, you can use some other DC power
source (7 to 13 V). The power source is connected by means of a low-voltage
connector (NES1 as per DIN 42323), center pin to minus.
If, however, the power supply has to be electrically isolated from the transdu-
cers or if a larger input voltage range (10 to 36 V DC) is required, electrically
isolated supply cable ZB 2290-UK must be used. It will then be possible to
operate the measuring instrument using a 12- or 24-volt on-board supply sy-
stem.
If a battery is connected, this will, in the event of a voltage drop
below 9 volts, take over as power supply.
3.3 Switching ON and OFF
The slide switch (1) on the left side of the device has three switch positions :
up : ON - measuring channel M10
middle : ON - measuring channel M0
down : OFF
To switch on, push the slide switch (1) located on the left side of the device up-
wards.
To switch off, push the slide switch down as far as it will go.
4. CONNECTING THE SENSORS
Virtually any ALMEMO®sensor can be connected to the ALMEMO® input sok-
ket M0 (2). To connect your own existing sensors you simply need the appro-
priate ALMEMO®connector.
4.1 Sensors
The ALMEMO®Manual includes detailed descriptions of the comprehensive
ALMEMO®sensor range (see Manual, Section 3) and of how to connect your
own existing sensors to ALMEMO®instruments (see Manual, Section 4). All
standard sensors with an ALMEMO®connector usually have the measuring
range and units already programmed and can thus be immediately connected
to any input socket. A mechanical code system ensures that sensors and out-
put modules can only be connected to the correct sockets. Each ALMEMO®
connector also incorporates two locking levers; these snap into position as
soon as the connector is inserted into the socket, thus preventing disconnecti-
on if the cable is pulled. To withdraw the connector, both these levers must be
pressed in at the sides.
ALMEMO2390-1 9
Connecting the sensors

4.2 Measuring inputs and additional channels
Measuring instrument ALMEMO®2390-1 incorporates one input socket M0 (2).
Of the maximum four channels that an ALMEMO®sensor may have this device
can use only two. Additional channels are available primarily for
humidity sensors (temperature / humidity / dew point / mixture ratio) or
flow probes and chemical probes incorporating a temperature sensor. A single
sensor can be programmed, if necessary, with several ranges or scaling
processes; similarly, if pin assignment permits, two sensors can be combined
on one connector (e.g. rH/Ntc, mV/V, mA/V, etc.). If the 2nd channel is not
programmed, the battery voltage is displayed. The additional measuring chan-
nel is located in the connector on the next level, number 10.
On the measuring instrument this gives the following channel assignment :
Sensors combined within one connector are electrically inter-
connected and must therefore be operated in isolation. The
voltage applied to the measuring inputs themselves must not
exceed ±5 volts (between B, C, D, and A or - ).
The cold junction compensation for thermocouple measurement is integrated
in socket M0 on the device.
0
10
20
30
channel 1
channel 2
channel 3
channel 4
M0 A1
2390-1
disabled
disabled
10 ALMEMO2390-1
Connecting the sensors

5. DISPLAY
The display (5) on measuring instrument ALMEMO®2390-1 comprises an LCD
with six 7-segment digits, two 16-segment characters, a battery symbol, and
arrows to indicate the operating status.
BAT CORR ALRM
M DIM
Special operating states and faults
Segment test for display : automatic - each time the device is
switched on Voltage supply : below 7 V : - symbol lights up
BAT
below 6 V: LobAt!!
Checksum error during
device calibration
Non-connected sensors,
deactivated measuring points
Non-permitted measuring range
Sensor correction or scaling CORR arrow lights up
Limit value exceeded ALRM arrow lights up
Sensor breakage: abbreviation
0:`NiCr´°C
flashes
Measuring range overshot : Maximum value flashes
Measuring range undershot : Minimum value flashes
Measuring range undershot for
cold junction compensation (Cold junction)
or breakage: flashes
Values range overshot (>65000): flashes
0:`65000´XX
CALErr!
0:----!
0:Err!!
0:`CJ´°C
ALMEMO2390-1 11
Display

6. SENSOR PROGRAMMING
Since on ALMEMO®devices all sensor programming is stored in the ALME-
MO®connector, you can connect any ALMEMO®sensor without needing to re-
program. Measuring instrument ALMEMO®2390-1 does not have its own inte-
grated programming facility. To connect certain sensors you must order AL-
MEMO®connectors that have already been appropriately programmed. If,
however, you wish to scale your own sensors or if sensor errors have to be
continually corrected, you can do the programming using one of the many
other ALMEMO®devices incorporating an integrated input facility; (see Manual,
Section 6.3).
6.1 Measuring ranges
With each channel switchover or sensor breakage the abbreviation for the
measuring range appears in the display. The following table lists all possible
measuring ranges for identification purposes.
Sensors Sensor/connector Meas. range Units Display
Pt100-1 FP Axxx -200.0... +850.0 °C P104
Pt100-2 FP Axxx -200.00...+300.00 °C P204
Ni100 ZA 9030-FS3 -60.0... +240.0 °C N104
NiCr-Ni (K) FT Axxx -200.0...+1370.0 °C NiCr
NiCroSil-NiSil (N) ZA 9020-FSN -200.0...+1300.0 °C NiSi
Fe-CuNi (L) ZA 9000-FSL -200.0... +900.0 °C FECO
Fe-CuNi (J) ZA 9000-FSJ -200.0...+1000.0 °C IrCo
Cu-CuNi (U) ZA 9000-FSU -200.0... +600.0 °C CUCO
Cu-CuNi (T) ZA 9000-FST -200.0... +400.0 °C CoCo
PtRh10-Pt (S) FS Axxx 0.0...+1760.0 °C Pt10
PtRh13-Pt (R) ZA 9000-FSR 0.0...+1760.0 °C Pt13
PtRh30-PtRh6 (B) ZA 9000-FSB +400.0...+1800.0 °C EL18
Au-FeCr ZA 9000-FSA -270.0... +60.0 °C AUFE
Ntc type N FN Axxx -30.00...+125.00 °C Ntc
Millivolt ZA 9000-FS0 -10.000...+55.000 mV U 55
Millivolt 1 ZA 9000-FS1 -26.000...+26.000 mV U 26
Millivolt 2 ZA 9000-FS2 -260.0...+260.0 mV U260
Volt ZA 9000-FS3 -2.0000...+2.6000 V U2.60
Difference millivolt ZA 9050-FS0 -10.000...+55.000 mV d 55
Difference millivolt 1 ZA 9050-FS1 -26.000...+26.000 mV d 26
Difference millivolt 2 ZA 9050-FS2 -260.0...+260.0 mV d260
Difference volt ZA 9050-FS3 -2.0000...+2.6000 V d2.60
Sensor voltage any 0.00...20.00 V UbAt
Milliampere ZA 9601-FS1 -26.000...+26.000 mA I032
Percent (4-20mA) ZA 9601-FS2 0.00... 100.00 % P420
Ohms ZA 9003-FS 0.0... 500.0 ΩOhn
Frequency ZA 9909-AK1 0... 32000 Hz FrEq
12 ALMEMO2390-1
Sensor programming

Sensors Sensor/connector Meas. range Units Display
Digital input ZA 9000-EK2 0.0... 100.0 % Inp
Digitale interface ZA 9919-AKxx -65000... +65000 diGi
Infrared 1 FI A628-1/5 0.0... +200.0 °C Ir 1
Infrared 4 FI A628-4 -30.0... +100.0 °C Ir 4
Infrared 6 FI A628-6 0.0... +500.0 °C Ir 6
Snap-on head, normal FV A915-S120 0.30... 20.00 m/s S120
Snap-on head, normal 40 FV A915-S140 0.40... 40.00 m/s S140
Snap-on head, micro 20 FV A915-S220 0.50... 20.00 m/s S220
Snap-on head, micro 40 FV A915-S240 0.60... 40.00 m/s S240
Macro FV A915-MA1 0.10... 20.00 m/s L420
Water-micro FV A915-WM1 0.00... 5.00 m/s L605
Dyn.pressure 40m/s w. TC FD A612-M1 0.50... 40.00 m/s L840
Dyn.pressure 90m/s w. TC FD A612-M6 1.00... 90.00 m/s L890
Relative air humidity, cap FH A646 0.0... 100.0 %H °orH
Relative air humidity, w. TC FH A646-R 0.0... 100.0 %H H rH
Humid temperature FN A846 -30.00 ... +125.00 °C P Ht
Rel. air humidity psychr. FN A846 0.0 ... 100.0 %H P RH
Mixture ratio pschr. FN A846 0.0 ... 500.0 g/k P AH
Dew-point temp. pschr. FN A846 -25.0 ... +100.0 °C P dt
Partial vapor press. psychr FN A846 0.0 ...1050.0 mb P UP
Enthalpy, psychr FN A846 0.0 ... 400.0 kJ P En
Conductivity probe, with TC FY A641-LF 0.0 ... 20.000 mS LF
CO2-sensor FY A600-CO2 0.0 ... 2.500 % CO2
O2saturation, with TC FY A640-O2 0 ... 260 % O2-S
Function channels
Maximum value any Hi
Minimum value any Lo
Alarm value of any % Alrm
Given its limited operating functions, the ALMEMO®2390-1 cannot be used to mea-
sure the following values
Pulses ZA 9909-AK2 0... 65000 PULS
Mixture ratio, cap FH A646 0.0 ... 500.0 g/k H AH
Dew-point temp. cap FH A646 -25.0... 100.0 °C H dt
Partial vapor pressure, cap FH A646 0.0 ...1050.0 mb H UP
Enthalpy, cap FH A646 0.0 ... 400.0 kJ H En
O2concentration, with TC FY A640-O2 0 ... 40.0 mg O2-C
Average value over time any A[t]
Av. value of meas. points any A[n]
Sum of measuring points any S[n]
Total number of pulses ZA 9909-AK2 0... 65000 S[t]
Pulses / print cycle ZA 9909-AK2 0... 65000 S[P]
Wet bulb globe temp. meas. ZA 9000-FS °C UbGt
TC = Temperature compensation
ALMEMO2390-1 13
Sensor programming

6.2 Dimension
The units are shown after the measured value as two 16-segment characters.
Depending on the programming (see Manual, Sec. 6.3.5) units other than the
standard units can be stipulated per measuring range; (see Manual, Sec. 6.1).
For degrees Fahrenheit (ºF) the temperature value is converted
from degrees Celsius
With the character Cor Fcold junction compensation is dis-
abled. The units ms are displayed as m/sand mh as m3/h.
7. MEASURING OPERATIONS
With measuring instrument ALMEMO®2390-1 both measuring channels are
scanned continuously; this ensures continuous temperature compensation for
dynamic pressure probes or chemical probes; (see Manual, Section 6.5.1.3).
Two measuring points can be displayed; (see Section 7.1). A measured value
can be sent to an analog output; (see Manual, Section 5.1.1).
7.1 Measured values and selection of measuring point
When the device is switched on (1st position) the display first of all shows the
current measured value for measuring point M0.
Measure - measuring point M0.
COR
R
MDIM
If the connected sensor is programmed for more than one measuring point
(e.g. a humidity sensor), you can select the second measuring point M10 by
means of the slide switch (1).
To select the 2nd measuring point by means of the slide switch:
COR
R
M
DIM
If, when switching measuring points, the measuring range changes, the abbre-
viation for the measuring range is displayed for a moment first; (see Section
6.1). This abbreviation also flashes in the event of sensor breakage - instead
of the measured value:
Display of the measuring range:
COR
R
MDIM
If the actual measured value changes as a result of programmed scaling or
correction values (see Manual, Sec. 6.3.10/11), then the ‘CORR’ arrow lights
up in the display
14 ALMEMO2390-1
Measuring operations

8. TROUBLE-SHOOTING
Measuring instrument ALMEMO®2390-1 can have a great many different sen-
sors and peripherals connected to it. Given these numerous possibilities the
device may in certain circumstances not behave quite as expected. The cause
of such unexpected behavior is only very rarely a device defect; more usually it
is incorrect operation by the user, an incorrect setting, or incorrect cabling. In
such event try to pinpoint and clear the problem with the aid of the following
tests.
Error: Either no display or all display segments light up continuously
Remedy: Check the power supply, switch off and then on again
Error: Measured values are incorrect
Remedy: Check the position of the slide switch (used for switching on and se-
lecting measuring channels). If the 'CORR' arrow lights up, this may
indicate that the measured value has been falsified by correction va-
lues; in this event have the programming checked at the factory or
try in conjunction with another ALMEMO®device.
Error: Fluctuating measured values or segment test or the system hangs in
mid-operation,
Remedy: Check the cabling for inadmissible electrical connections, disconnect
the external power supply and the analog output, unplug the sensor
and replace with a hand-held sensor and operate them in air or
dummies (for thermocouples short-circuit A-B, for Pt100 sensors,
100-Ωresistor); if these steps succeed in clearing the error, then
check all wiring, if necessary, insulate the sensor, use an electrically
isolated power supply, eliminate interference by using shielded or
twisted wiring
Error: ´CALErr´ is displayed when device is switched on
Remedy: The calibration of a measuring range may have become misadju-
sted; the device must be recalibrated at the factory
If, after performing the above-listed checks and remedial steps, the device still
fails to behave as described in the instructions, it must be returned to our facto-
ry in Holzkirchen, accompanied by a explanatory note and error description.
Complaints not accompanied by explanation and error description cannot be
processed.
ALMEMO2390-1 15
Trouble-shooting

9. ELECTROMAGNETIC COMPATIBILITY
ALMEMO®measuring instrument 2390-1 complies in full with the safety requi-
rements specified in the EU directive on the approximation of Member States’
laws relating to electromagnetic compatibility (EMC) (89/336/EEC).
The following standards have been applied in evaluating the product :
IEC 61326:1997+A1:1998+A2:2000
IEC 61000-6-1:1997 IEC 61000-6-3:1996
IEC 61000-4-2: 1995+A1:1998+A2:2000 8kV IEC 61000-4-4: 1995+A1:2000 2kV
IEC 61000-4-3: 1995+A1:1998+A2:2000 3V/m
The following advisory notes must be observed when operating the device :
1. If the standard sensor is extended (1.5 meters) care must be taken to ensu-
re that the measuring lines are not laid together with high-voltage power
cables or that they are properly shielded so as to prevent spurious interfe-
rence from being induced in the system.
2. Using the device in strong electromagnetic fields may aggravate measuring
errors (<50 uV at 3 V/m and 1.5 meters thermocouple sensor). After expo-
sure to such irradiation ceases, the device will again operate within its
technical specifications
16 ALMEMO2390-1
Electromagnetic compatibility

Technical data (see also Manual, Section 2.2)
Measuring inputs: one ALMEMO®socket for ALMEMO®sensors
Channels : 2 measuring or function channels, depending on
sensor type-
Sensor power supply : Battery : 7 to 9 V, max. 100 mA
Mains adapter : approx. 12 V, max. 100 mA
Measuring rate : 2.5 measuring operations per second
System accuracy : ±0.05% of measured value ±3 digits
Temperature drift : 0.01% / K
Cold junction compens. : ± 0.2 K ± 0.01 K /ºC (-30 to +80 ºC)
Outputs : 1 ALMEMO®socket for analog output module
Equipment :
Display : 6-digit 7-segment, 2-digit 16-segment, 12 mm
A/D converter : delta-Sigma ± 16 bit
Microprocessor : NEC 78F0078
Power supply : 7 to 13 V DC, not electrically isolated
Mains adapter : ZB 2290-NA, 230 V AC to 12 V DC, 200 mA,
electrically isolated
Adapter cable, el. isol. : ZB 2290-UK, 10 - 30 V DC. to 12 V DC, 250 mA
Current consumption : approx. 5 mA (without input and output modules)
Housing : 180 x 85 x 33 mm,
ABS (acrylonitrile butadiene styrene)
high impact resistance (max. 70 °C)
Operating temperature : -10 ... +60 ºC
Storage temperature : -30 ... +60 ºC
Ambient rel. humidity : 10 to 90 % (non-condensing)
Delivery includes : Measuring instrument ALMEMO®2390-1
Operating instructions ALMEMO®2390-1
ALMEMO®Manual
Product overview Order no.
Universal measuring instrument ALMEMO®2390-1
1 input, 2 channels, connection for analog output MA 2390-1
Mains adapter, 12 V DC, 200 mA ZB 2290-NA
DC adapter cable, 10 to 30 V DC, 12 V / 250 mA,
electrically isolated ZB 2290-UK
ALMEMO®analog output module
- 1.25 to 2.00 V, 0.1 mV / digit ZA 1601-RK
ALMEMO2390-1 17
Appendix

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ALMEMO2390-1 19
Appendix

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