Ahlborn ALMEMO 4490-2 User manual

Operating Instructions

Switchboard Instrument

ALMEMO®4490-2

V1.2

04.12.2003

ALMEMO4490-2 1

Operating Instructions

Switchboard Instrument

ALMEMO®4490-2

For Reference with the ALMEMO®Manual

Table of Contents

Page

1. INTRODUCTION 4

1.1 Function Range 4

1.2 Front Operating Controls 9

1.3 Rear Operating Controls 10

2. INITIAL OPERATION 11

3. POWER SUPPLY 11

3.1 Mains Operation 11

3.2 DC Voltage Supply 11

3.3 Data Storage, Reinitialisation 11

4. CONNECTION OF THE TRANSDUCERS 12

4.1 Transducers 12

4.2 Measuring Inputs and Additional Channels 13

5. DISPLAY AND KEYPAD 14

5.1 Display 14

5.2 Selection and Activation of Functions 15

5.3 Keypad 16

5.4 Data Input 16

2 ALMEMO4490-2

Table of Contents

6. SENSOR PROGRAMMING 17

6.1 Selecting the Measuring Channel 17

6.2 Selecting the Measuring Range 17

6.3 Changing the Dimension 20

6.4 Limit Values 21

6.5 Correction Values 22

6.6 Scaling, Decimal Point Setting 23

6.7 Locking of the Sensor Programming 24

7. MEASUREMENT 25

7.1 Continuous Measurement of a Measuring Point 25

7.1.1 Selecting the Measured Value and Measuring Point 25

7.1.2 Conversion Rate, Continuous Measuring Point Scan 26

7.1.3 Memory for Peak Values 26

7.1.4 Setting Measured Values to Zero, Zero Point Correction 27

7.1.5 Atmospheric Pressure Compensation 29

7.1.6 Temperature Compensation 29

7.2 Measuring Point Scans 30

8. ANALOGUE OUTPUT 30

8.1 Scaling 31

9. DIGITAL DATA OUTPUT 31

9.1 Baud Rate, Data Format 31

9.2 Device Address and Networking 32

9.3 Manual Data Output 33

10. TROUBLESHOOTING 34

11. ELECTROMAGNETIC COMPATIBILITY 35

APPENDIX 36

Technical Data 36

Product Overview 36

ALMEMO4490-2 3

Table of Contents

1. INTRODUCTION

The switchboard instruments ALMEMO®4490-2

Version 5

are instruments

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®instruments

in the same way. The operation and programming is identical with all units.

Therefore, all 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 keypad 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 switchboard instrument ALMEMO®4490-2 has an ALMEMO®measuring

input with 4 channels or a measuring channel for a direct connection of

sensors. Two output sockets allow for connecting any ALMEMO®output

modules, for example, the analogue output, digital interface, trigger input or

alarm contacts. As an option, an electrically isolated analogue output and

relays can also be integrated into the instrument. Several devices can be

networked by simply connecting them with network cables.

For an easy operation a keypad and a 6-digit LED display are integrated. The

instruments have many functions for an optimal evaluation of all sensors. To

avoid a difficult operation resulting from functions that are not required, the

functions can be activated and deactivated automatically or by selecting the

display mode or individually via the interface. A range of special functions can

only be accessed via the interface.

4 ALMEMO4490-2

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 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 additional 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 two measuring

channels can be programmed as function channels and can be processed and

printed like normal measuring points.

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 can be

performed by the push of a button.

ALMEMO4490-2 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.

Limit Values and Alarm

Two limit values (optionally Max and/or 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 the limit value relay option, alarm contacts are available that

can be individually allocated to limit values. As a standard, the hysteresis is set

to 10 digits, however, it can also be set between 0 and 99 digits. Furthermore,

limit value exceeding can also be used to start or stop a measuring point scan.

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 keypad. 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. Standard sensors without an ALMEMO®

connector can be directly connected by means of a special multipoint

connector. The programming of the corresponding channel must be performed

each time the sensor is changed.

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 O2

sensors. With infrared sensors the parameters zero point and slope correction

are used for background temperature and emissivity factor.

6 ALMEMO4490-2

Functions

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 (0-2V, 0-10V or 0/4-20mA).

Max and Min Value

Each measurement involves an acquisition and storing of the maximum and

minimum value. These values can be displayed, printed and cleared.

PROCESS FLOW PROGRAMMING

A cyclic measuring point scan with a time-based process flow control is

required to register measuring data of all measuring channels via the interface.

For this purpose, a 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 interface, an external

trigger signal or an exceeding of limit values.

Time and Date

Time and date 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 allows a

cyclic output of measured values to the interfaces as well as a cyclic averaging.

Measuring Cycle

The measuring cycle, also programmable between 1s and 59h/59min/59s, is

for a cyclic scanning with limit value monitoring, alarm message and output of

alarm values and averaging.

Average Value over Measuring Point Scans

The measured values that result from measuring point scans can be averaged

as desired either over the total measuring time or over the print cycle. Function

channels are provided for a cyclic output of average values.

Conversion Rate

With ALMEMO®

devices, all measuring points can be continuously

scanned with the conversion rate (2.5 or 10 meas./s). It is also possible to

provide all measured values as an output via the interface.

Control Outputs

The interface allows to individually trigger the 2 internal or up to 4 external

output relays and one analogue output.

ALMEMO4490-2 7

Functions

Output

All measuring and programming data is, firstly, accessible via keypad and LED

display. RS232, RS422 and a Centronics interface are available by using

different interface cables. All data logs, stored 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 and the configuration of the measuring instrument, is supplied with

each ALMEMO®manual. The integrated terminal also allows for online

measurements. 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4490-2

Functions

1.2 Front Operating Controls

(1) LED DISPLAY 4-digit 7-segment and minus f. meas. and progr. values

2-digit 14-segment for dimension or function

(2) MEAS. CHAN. M1, M2, M3 (M0 clamp. conn. or ALMEMO®without display)

(3) ALARM LAMPS A1 and A2 for limit value 1 and limit value 2

(4) FUNCTION KEYS

ENTER, ▲▼, entering programming values

▲

ENTER, CLR clear data, set measured value to zero

MEAS.VAL. ▲ selection of meas. value and meas. point

F1 selection of measuring functions

max value (Hi) MH

min value (Lo) ML

conversion rate CR

~for humidity, dyn. press. a. O2sensors atmospheric pressure mb ~

" for pH and dyn. pressure probes temperature compensation TC "

F2 selection of programming functions

range R

limit value 1 max/min (Hi/Lo) H1/L1

limit value 2 min/max (Lo/Hi) L2/H2

hysteresis HY

base value BA

factor FA

exponent EX

zero point correction ZC

slope (gain) correction SC

^ for IR sensors ambient temperature AT ^

emissivity factor EF ^

locking mode LM

* with interface module baud rate BR *

device address A*

analogue output - start AS

analogue output - end AE

analogue output type 0/4-20 mA

ALMEMO4490-2 9

Operating Controls

1.4 Rear Operating Controls

(5) Power Supply N-L 230 V AC, 50/60 Hz

Option U -+ 10..36 V DC

(6) Relay Contacts S1-C1-Ö1 lim. value 1 (make and break)

S2-C2-Ö2 lim. value 2 (make and break)

(7) Analogue Output Out -+ electrically isolated

Option R1 -1.25 V to 2 V (0.1mV/digit)

Option R2 -6.00 V to 10 V (0.5mV/digit)

Option R3 0/4 mA to 20mA (1µA/digit)

Meas. Inputs

(8) Clamp. Connector A-B-C-D meas. chan. M0, internal for exist. sensors

Sensor Volt. Supply -+ ca. 7V DC, 50 mA not electrically isolated

Option V1 12V DC, 30 mA electrically isolated

Option V2 12V AC, 50 mA electrically isolated

(9) ALMEMO®socket M meas. chan. M0 to M3 for all ALMEMO®sensors

Output Sockets

(10) ALMEMO®socket A2 network cable ZA1999-NK5

trigger input with cable ZA 1000-ET

relay outputs ZA 1000-EGK

analogue output 2 ZA 1601-RK

(11) ALMEMO®socket A1 V24 interface with cable ZA 1909-DK5

V24 interface with fiber optics ZA1909-DKL

RS 422 (ZA 5099-NVB / L)

analogue output 1 with cable ZA 1601-RK

AHLBORN

C1 C2S2S1 O1 O2

ABCD

OUT

20mA

-+-+

AMR

230V~

A1A2

91011

10 ALMEMO4490-2

Operating Controls

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