AHLBORN ALMEMO 2450-1L Universal measuring instrument Operating instructions

____________________________

Operating instructions

Universal measuring instrument

ALMEMO

®

2450-1L

V2.3

06.11.2013

www.ahlborn.com

1. Operating controls

1. OPERATING CONTROLS

(1) Measuring inputs M0

M0 for a wide range of sensors

M10 to M30 3 additional channels

(2) LCD

Function field

(a) Function

(b) Measuring point, 2nd meas. value

(c) Units for 2nd measured value

Main field

(c) Units for 1st measured value

(e) 1st measured value

(f) Operating states :

LOBAT

REL

Battery voltage <3.8 V

Relative measuring

(3) Operating keys

ON OFF

Switch the device on

To switch device OFF, press and hold down

M▲

,

M▼

Meas. point selection

MAX , MIN

MEM

CLR

Max. / min. value cancel: press and hold down

Measured value memory

Relative measuring

Adjust sensor, cancel: press and hold down

To switch ON with press keys :

CLR

MEM

M▲

Reinitialization

Device configuration

Softwareversion

Rear of device

(4) Battery compartment

3 AA alkaline-manganese batteries

2 ALMEMO ® 2450-1L

Contents

2. CONTENTS

1. OPERATING CONTROLS..........................................................................2

3. GENERAL...................................................................................................5

3.1 Warranty...............................................................................................5

3.2 Scope of delivery.................................................................................6

3.3 Waste disposal....................................................................................6

4. SAFETY INSTRUCTIONS..........................................................................7

4.1 Special notes on use...........................................................................8

4.2 Handling batteries / rechargeable batteries correctly......................8

5. INTRODUCTION.........................................................................................9

5.1 Functions.............................................................................................9

5.1.1 Sensor programming....................................................................9

5.1.2 Measuring operations.................................................................10

6. INITIAL COMMISSIONING.......................................................................11

7. POWER SUPPLY.....................................................................................11

7.1 Battery operation and supply voltage monitoring..........................11

7.2 Sensor supply....................................................................................11

7.3 Switching ON / OFF, reinitialization.................................................12

7.4 Data buffering....................................................................................12

8. CONNECTING THE TRANSDUCERS......................................................12

8.1 Transducers.......................................................................................12

8.2 Measuring inputs and additional channels.....................................13

9. DISPLAY AND KEYPAD..........................................................................14

9.1 Display................................................................................................14

9.2 Keypad...............................................................................................15

10. MEASURING OPERATIONS....................................................................16

10.1 Measured value...............................................................................16

10.1.1 Selecting a measuring point.....................................................16

10.1.2 Measuring ranges.....................................................................17

10.1.3 Double display..........................................................................18

10.2 Peak value memory.........................................................................18

10.3 Measured value memory.................................................................18

10.4 Relative measuring.........................................................................19

11. DEVICE CONFIGURATION......................................................................19

11.1 Automatic switch OFF.....................................................................20

11.2 Device locking.................................................................................20

12. TROUBLE-SHOOTING............................................................................20

13. DECLARATION OF CONFORMITY.........................................................21

ALMEMO ® 2450-1L 3

2. Contents

14. APPENDIX................................................................................................22

14.1 Technical data.................................................................................22

14.2 Product overview................................................................................

.................................................................................................................. 22

14.3 Index.................................................................................................23

14.4 Your contact....................................................................................24

4 ALMEMO ® 2450-1L

General

3. GENERAL

Congratulations on your purchase of this new and innovative ALMEMO measuring instrument. Thanks to the patented ALMEMO

®

® connector the device configures itself automatically; its operation should be fairly straightforward. The device can, however, be used with such a wide range of sensors and peripherals and offers many different special functions. You are advised therefore to properly familiarize yourself with the way the sensors function and with the device's numerous possibilities and take the time to carefully read these operating instructions and the appropriate sections in the

ALMEMO ® Manual. This is absolutely necessary to avoid operating and measuring errors and to prevent damage to the device. To help you find the answers to your questions quickly and easily there is a comprehensive index at the end both of these instructions and of the Manual.

3.1 Warranty

Each and every device, before leaving our factory, undergoes numerous quality tests. We provide a guarantee, lasting two years from delivery date, that your device will function trouble-free. Before you send your device to us, please

observe the advisory notes in Chapter 12. Trouble-shooting In the unlikely

event that the device proves defective and you need to return it please wherever possible use the original packaging material for dispatch and enclose a clear and informative description of the fault and of the conditions in which it occurs.

This guarantee will not apply in the following cases :

 The customer attempts any form of unauthorized tampering or alteration inside the device.

 The device is used in environments and conditions for which it is not suited.



The device is used with unsuitable power supply equipment and / or peripherals.

 The device is used for any purpose other than that for which it is intended.

 The device is damaged by electrostatic discharge or lightning.

 The user fails to observe and comply with the operating instructions.

The manufacturer reserves the right to change the product's characteristics in the light of technical progress or to benefit from the introduction of new components.

ALMEMO ® 2450-1L 5

3. General

3.2 Scope of delivery

When you unpack the device check carefully for any signs of transport damage and ensure that delivery is complete.

Measuring instrument ALMEMO

These operating instructions

ALMEMO ® Manual

® 2450-1L with 3 AA alkaline batteries

CD with the AMR-Control software and various useful accessories

In the event of transport damage please retain the packaging material and inform your supplier immediately.

3.3 Waste disposal

The pictogram showing a waste bin crossed through means that the product is subject to European Union regulations on segregated waste disposal. This applies both to the product itself and to any accessories marked with the same symbol. Disposal of any such item as unsorted domestic waste is strictly forbidden

•

•

•

•

•

Please dispose of all packaging materials according to the applicable national waste management regulations.

Please dispose of cardboard boxes, protective plastic packaging materials, and all preservative substances separately and in the proper manner.

The disposal of the device itself (also of device parts, accessories, and consumables) is subject to the applicable national and local waste management regulations and to the environmental protection legislation in force in the country of use.

Please dispose of all waste in the proper manner; this applies in particular to all parts and substances that constitute a hazard for the environment. This includes inter alia plastics, batteries, and rechargeable battery packs .

When disposing of goods, please wherever possible use the original packaging materials.

6 ALMEMO ® 2450-1L

Safety instructions

4. SAFETY INSTRUCTIONS

DANGER Danger to life and limb, risk of damage to equipment

Read the instructions carefully before starting to operate the device.

Please ensure that you comply with all general safety advice and the special safety instructions included in other chapters.

Such risks may occur in the following circumstances :

•

•

•

•

•

•

Failure to heed the operating instructions and all the safety notes these contain

Any form of unauthorized tampering or alteration inside the device

Use of the device in environments or conditions for which it is not suited

Use of the device with an unsuitable power supply and / or in conjunction with unsuitable peripheral equipment

Use of the device for any purpose other than that for which it is intended

Damage caused by electrostatic discharge or lightning.

DANGER Risk of fatal injury caused by dangerously high voltage

Such risks may occur in the following circumstances :

•

•

•

•

Use of the device with an unsuitable power supply and

/ or in conjunction with unsuitable peripheral equipment

Damage caused by electrostatic discharge or lightning

Do not run sensor lines in the vicinity of high-voltage power cables.

Before you touch any sensor lines, ensure that all static electricity has been discharged.

ALMEMO ® 2450-1L 7

4. Safety instructions

DANGER Warning - explosive atmospheres or substances

In the vicinity of various fuels or chemicals there is a risk of explosion.

Do not use the device in the close vicinity of blasting work or filling stations!

4.1 Special notes on use

•

•

If the device is brought into the work-room from a cold environment there is a risk that condensation might form on the electronics. In measuring operations involving thermocouples pronounced changes in temperature may cause substantial measuring errors. You are advised therefore to wait until the device has adjusted to the ambient temperature before starting to use it.

Before using the mains adapter make sure that the mains voltage is suitable.

•

•

Be sure to observe the maximum load capacity of the sensor power supply.

Sensors with their own integrated power supply are not electrically isolated from one another

4.2 Handling batteries / rechargeable batteries correctly

When inserting batteries / rechargeable batteries ensure that these are correctly polarized.

If the device will probably not be needed for a relatively long period of time or if the batteries are empty, remove the batteries; this will prevent battery acid leaking onto the device and damaging it.

Rechargeable batteries should be recharged as and when necessary.

You should never attempt to recharge an ordinary (nonrechargeable) battery; it may explode !

Batteries / rechargeable batteries must never be short-circuited or thrown onto the fire.

Batteries / rechargeable batteries are special waste and must not be discarded together with normal domestic waste.

8 ALMEMO ® 2450-1L

Introduction

5. INTRODUCTION

The ALMEMO

®

2450-1L is a new member in our family of unique measuring devices - all equipped with Ahlborn's patented ALMEMO

The intelligent ALMEMO

®

®

connector system.

connector offers decisive advantages when connecting sensors and peripherals because all parameters are stored in an EEPROM located on the connector itself; repeat programming is thus no longer necessary.

All sensors can be connected to all ALMEMO ing points apply to all devices in the ALMEMO described in detail in the ALMEMO each device.

®

measuring instruments in the same way. Programming and functioning are identical for all units. The follow-

®

measuring system; these are

®

Manual which is included in delivery with

Detailed explanation of the ALMEMO

®

system (Manual Ch 1)

Overview of the device functions and measuring ranges (Manual Ch 2)

Basic principles, operation, and technical data for all sensors (Manual Ch 3)

Options for connecting your own existing sensors (Manual Ch 4)

The operating instructions you are now reading cover only those features and controls that are specific to this device. Many sections therefore also refer to the more detailed description in the Manual; (see Manual, Section xxx).

5.1 Functions

The ALMEMO

®

2450-1L measuring instrument has just one measuring input suitable for most ALMEMO

®

sensors - with the single exception of resistance sensors. The measuring possibilities are numerous; there are 4 channels in the sensor connectors with over 40 measuring ranges. For operation purposes the device incorporates a large LCD display and a keypad.

5.1.1 Sensor programming

The measuring channels are programmed, completely and automatically, by the ALMEMO

®

connectors. The user can supplement or modify this programming; this applies to the other devices only. However, this device also behave according to all the programmed parameters.

Measuring ranges

Appropriate measuring ranges are available for all sensors with a non-linear characteristic, e.g. 7 thermocouple types, NTC probes, and flow transducers

(rotating vanes, thermoanemometers). For humidity sensors additional function channels are available for calculating humidity variables such as dew point, mixture ratio, vapor pressure, and enthalpy. Measured values from other sensors can also be acquired using the voltage and current ranges with individual scaling in the connector. Existing sensors can also be used - so long as the appropriate ALMEMO

®

connector is connected via its screw terminals. For digital input signals, frequencies, and pulses, adapter connectors are available with an integrated microcontroller. It is thus possible to connect numerous sensor

ALMEMO ® 2450-1L 9

5. Introduction types to any ALMEMO

®

measuring instrument and to change sensors without the need for any extra settings.

Units

The 2-character units display can be adapted for each measuring channel so that both the display and the printout always indicate the correct units, e.g.

when a transmitter is connected. Conversion between °C (Centigrade) and °F

(Fahrenheit) is performed automatically.

Measured value designation

Each sensor is identified by means of a 10-character alphanumeric name. This name is entered via the interface and will appear in the printout or on the computer display.

Correction of measured values

The measured value on each measuring channel can be corrected both in terms of zero-point and gain; this means that even sensors usually requiring initial adjustment (e.g. expansion, force) can be freely interchanged. Sensors with multi-point calibration can also be connected; (see Manual Section

6.3.13).

Scaling

The corrected measured value on each measuring channel can also be further scaled in terms of zero-point and gain - using the base value and factor. The decimal point position can be set by means of the exponent function.

Sensor locking

All sensor data stored in the connector EEPROM can be protected by means of a graduated locking function against undesired access.

5.1.2 Measuring operations

A total of up to 4 measuring channels are available for 1 transducer; i.e. it is also possible to evaluate double sensors, individually scaled sensors, and sensors with function channels. You can move forwards or backwards from one measuring channel to the next using the keypad. The selected measuring point is by default assigned preferred status and is scanned at half the measuring rate; all other active channels are also scanned but in the background (semicontinuous mode). The data is output on the display.

Measured values

The measured value for the selected measuring point is shown continuously with autozero and, as and when necessary, with measured value correction.

With most sensors, sensor breakage is detected automatically (except for connectors with shunt, dividers, or additional electronics).

Measuring functions

With some sensors, to achieve optimal measured value acquisition, certain special measuring functions are required. These include e.g. cold junction compensation for thermocouples and temperature and atmospheric pressure compensation for certain humidity variables.

10 ALMEMO ® 2450-1L

Functions

Maximum and minimum values

For each measuring operation the maximum value and minimum value are acquired and saved to memory. These values can then be displayed, output, or deleted from memory.

Measured value memory

A measured value in the display can be saved by simply pressing a key.

6. INITIAL COMMISSIONING

1. Connect sensor to socket M0 (1); see 8.

2. Ensure that the power supply is provided by 3 AA batteries;

3. To switch ON press key ON

(3); see 7.3

4. Select measuring channels by pressing key M▲ (3), read out measured

values (5e); see 10.1.1

5. Save the measured value by pressing key MEM

(3); see 10.3

6. Relative measuring to a reference value by pressing key CLR (3)

Revert to normal measured value by pressing and holding down key CLR

7. Evaluating a measuring operation

Call up maximum / minimum values by pressing keys MAX / MIN (3)

To delete max. / min. value(s) press and hold down key MAX or MIN see

10.2

7. POWER SUPPLY

Power can be supplied to the measuring instrument with 3 AA alkaline batteries (included in delivery)

7.1 Battery operation and supply voltage monitoring

Power is supplied to the measuring instrument as delivered by 3 AA batteries.

At a current consumption of approx. 10 mA the operating time will be approx.

250 hours. The current operating voltage is displayed each time the the device is switched on; this gives you a basis for estimating the remaining operating time. When the remaining battery capacity drops to approx. 10 percent, the LO-

BAT arrow will appear in the display. If the batteries are completely discharged the device will switch off. To replace old batteries first unscrew the battery compartment cover (7) on the rear of the device.

7.2 Sensor supply

At the terminals + (plus) and – (minus) in the ALMEMO ® connector there is a 9volt sensor supply voltage available (maximum 150 mA) (self-healing fuse, 500 mA). Other voltages (12, 15, or 24 V or references for a potentiometer and strain gauge) can be obtained using special connectors; (see Manual 4.2.5 and

4.2.6).

ALMEMO ® 2450-1L 11

7. Power supply

7.3 Switching ON / OFF, reinitialization

To switch the device ON briefly press and release the key

ON OFF r

(3) in the middle of the keypad; to switch the device, OFF press and hold down the key

ON OFF r

. After the device is switched off all saved values and settings are re-

tained intact; (see 7.4).

If interference (e.g. electrostatic) or a malfunction (e.g. battery failure) causes the device to behave abnormally, the device can be reinitialized. To activate

RESET press and hold down the key CLR r when switching on. This will restore all settings to the factory default status. Only the programming of the sensors in the ALMEMO

®

connectors remains unaffected.

7.4 Data buffering

The sensor's programming is stored in the EEPROM on the sensor connector and the device's calibration and programmed parameters are stored in the

EEPROM on the instrument itself, both on a fail-safe basis.

8. CONNECTING THE TRANSDUCERS

Only certain ALMEMO

®

sensors can be connected to ALMEMO

®

input socket

M0 (1), namely those programmed with measuring ranges as per Ch 10.1.2.

Attempting to connect any other sensor here will trigger an error message. To connect your own existing sensors you simply need the appropriate

ALMEMO

®

connector.

8.1 Transducers

The ALMEMO

®

Manual includes detailed descriptions of the ALMEMO

®

range of sensors (see Manual Ch 3) and instructions for connecting your own existing sensors to ALMEMO

®

instruments (see Manual Ch 4). All suitable sensors with an ALMEMO

®

connector (see above) have the measuring range and units already programmed and can thus be connected to the input socket without further adjustment. A mechanical coding system ensures that sensors and output modules can only be connected to the correct sockets. All ALMEMO

®

connectors incorporate two snap-lock levers; these snap into position as soon as the connector is inserted into the socket, thus preventing unintended disconnection if the cable is accidentally pulled. To withdraw the connector, both these levers must be pressed in at the sides.

For the ALMEMO

®

2450-1L version with the optional seal new specially designed sensors are available with spray-coated ALMEMO

®

connectors incorporating a double sealing lip to protect the socket unit against the effects of splashing water. For any unused sockets protective stoppers are available.

12 ALMEMO ® 2450-1L

Measuring inputs and additional channels

8.2 Measuring inputs and additional channels

The ALMEMO

®

2450-1L measuring instrument has one input socket (1) to which initially measuring channel M0 is assigned. ALMEMO

®

sensors can, however, if necessary, provide up to four channels. The additional channels can be used in particular for humidity sensors with four measuring variables

(temperature / humidity / dew point / mixture ratio) or for function channels.

Each sensor can if necessary be programmed with several measuring ranges or scaling settings; and two or three sensors, if pin assignment so permits, can be combined in a single connector (e.g. rH / NTC, mV / V, mA / V, etc.). The additional measuring channel numbers per connector go up in steps of 10 (e.g.

the first sensor has channels M0, M10, M20, M30).



Double connectors with 2 x differential voltage / differential current

(input D - B) are not possible.

On the measuring instrument this gives the following channel assignment : sensor channels

4. chan.

3. chan.

2. chan.

1. chan.

30

20

10

00

M0

P0

A2 A1 DC

Sensors combined within one connector and sensors with their own power supply are electrically interconnected and must therefore be operated in isolation. The voltage at the measuring inputs themselves must not exceed 5 volts

(between B, C, D, A and - ).

ALMEMO ® 2450-1L 13

9. Display and keypad

9. DISPLAY AND KEYPAD

9.1 Display

The display (2) on the ALMEMO ® 2450-1L measuring instrument is a 2-row

LCD arrangement; the main field comprises 5x 7-segment digits (e) plus 2x 16segment digits (d) for depicting the measured value;,the function field comprises 41/2x 7-segment digits (b) for depicting various measuring functions (a); there are also 2 arrows (f) for depicting the operating status.

Function field

Main field

Display of measuring functions in

Measuring point

Maximum value

Minimum value

Saved value

M

O

MAX

36

.

5

MIN

17

.

3

M

36

.

2

Temperature value from double sensors

Configuration of locking

Configuration of automatic OFF

26

.

5

°C

Loc

AOFF the

function field

14 ALMEMO ® 2450-1L

Display

Special operating states and faults

Display segment test :

Supply voltage runs automatically after switch ON

Display after segment test

Under 3.8 V : LOBAT arrow lights up

Relative measuring with respect to a reference value : REL arrow lights up

Checksum error in device calibration :

CALEr

Non-connected sensors, deactivated measuring points :

-----

Measuring range / function not permitted :

Multiplexer M5 (D-B) is not allowed:

Err

ErrI

Sensor breakage :

NiCr

flashes

Outside of measuring range, undershoots cold junction compensation or cold junction compensation breakage :

CJ

flashes

Overshoots values range (>65000) :

Overshoots measuring range :

Undershoots measuring range :

9.2 Keypad

To operate the device a keypad with 7 keys is provided :

65OOO

flashes

Maximum value flashes

Minimum value flashes

Function :

To switch ON the device : (see Section 7.3)

Key

ON OFF

To switch OFF the device : must be pressed and held down

Function :

ON OFF

Key

Selection of measuring points (see Section 10.1.1)

M

or

M

ALMEMO ® 2450-1L 15

9. Display and keypad

Displaying the maximum value : (see Section 10.2)

MAX

To delete press and hold down

Displaying the minimum value : (see Section 10.2)

MIN

To delete press and hold down

Zero-setting the measured value : (see Section 10.4)

CLR

To delete press and hold down

Saving the measured value : (see Section 10.3)

MEM

Displaying the battery voltage :

ON OFF

10. MEASURING OPERATIONS

On the ALMEMO

®

2450-1L all measuring channels, whenever available, are scanned semi-continuously at 2.5 mops; (see Manual 6.5).

Up to 4 measuring points can be displayed; (see Section 8.2)

10.1 Measured value

After switching ON first of all a segment test is performed; then the battery voltage appears and if the batteries are almost empty

(<3.8 V) the LOBAT arrow also appears.

The measured value is then displayed with the appropriate units in the main field and the measuring point is displayed in the function field. All special operating states possible for the measured value are explained in Section

.

10.1.1 Selecting a measuring point

By pressing key

M

you can select one after the other all active measuring points and have the current measured value displayed for each. By pressing key

M

you can return to the previous channel.

To increment the measuring channel press key :

M

To decrement the measuring channel press :

When switching between channels the abbreviation for the measuring range is

briefly displayed; (see 10.1.2).

16 ALMEMO ® 2450-1L

Measured value

10.1.2 Measuring ranges

With each channel switchover or sensor breakage the abbreviation for the measuring range appears in the display. For identification purposes the following table lists all possible measuring ranges supported by this device.

Transducer Sensor / conMeasuring range Units Abbre-

NiCr-Ni (K)

NiCroSil-NiSil (N)

Fe-CuNi (L)

Fe-CuNi (J)

Cu-CuNi (U)

Cu-CuNi (T)

PtRh10-Pt (S)

Ntc Typ N

Millivolt

Millivolt 1

Millivolt 2

Volt

Difference millivolt

Difference millivolt 1

Difference millivolt 2

Difference volt*

Sensor voltage

Milliampere

Percent (4-20mA)

Frequency

Digital input

nector

FT Axxx

ZA 9020-FSN

ZA 9000-FSL

ZA 9000-FSJ -200.0... +950.0

°C IrCo

ZA 9000-FSU -200.0... +600.0

°C CUCO

ZA 9000-FST

FS Axxx

-200.0... +400.0

°C CoCo

°C Pt10

FN Axxx

viation

-200.0...+1370.0

°C NiCr

-200.0...+1300.0

°C NiSi

-200.0... +900.0

°C FECO

ZA 9000-FS0

ZA 9000-FS1

ZA 9000-FS2

ZA 9000-FS3

0.0...+1760.0

-20.00...+100.00

°C Ntc

-10.000...+55.000

mV U 55

-26.000...+26.000

mV U 26

-260.00...+260.00

mV U260

-0.2600...+2.6000

V U2.60

ZA 9000-FS0D -10.000...+55.000

mV d 55

ZA 9000-FS1D -26.000...+26.000

mV d 26

ZA 9000-FS2D -260.00...+260.00

mV d260

ZA 9000-FS3D -0.2600...+2.6000

any 0.00...20.00

V d2.60

V UbAt

ZA 9601-FS1

ZA 9601-FS2

ZA 9909-AK1

ZA 9000-EK2

0.000...+26.000

0.00... 100.00

mA I032

% P420

0... 32000

Hz FrEq

0.0... 100.0

% Inp

Digitale interface

Snap-on head normal 20

Snap-on head normal 40

Snap-on head micro 20

Snap-on head micro 40

Macro

Water-Micro

ZA 9919-AKxx

FV A915-S120

-65000... +65000 diGi

0.30... 20.00

m/s S120

FV A915-S140

FV A915-S220

FV A915-S240

FV A915-MA1

FV A915-WM1

Relative air humidity, capacitive FH A646

Rel. air humidity, capacitive TC FH A646-C

Rel. air humidity, capacitive TC FH A646-R

Mixture ratio, capacitive

Dew-point temperature, cap.

Partial vapor pressure, cap.

Enthalpy, capacitive

FH A646

FH A646

FH A646

FH A646

0.40... 40.00

m/s S140

0.50... 20.00

m/s S220

0.60... 40.00

m/s S240

0.10... 20.00

m/s L420

0.00... 5.00

m/s L605

0.0... 100.0

%H °orH

0.0... 100.0

%H HcrH

0.0... 100.0

%H H rH

0.0 ... 500.0

g/k H AH

-25.0... 100.0

°C H dt

0.0 ...1050.0

mb H UP

0.0 ... 400.0

kJ H En

* Double connectors with differential voltage / differential current (D-B) cannot be used

ALMEMO ® 2450-1L 17

10. Measuring operations

Transducer Sensor / connector

Functions channels:

Maximum value of channel Mb1 any

Minimum value of channel Mb1 any

Alarm value of channel Mb1 any

Measured value of Mb1

Cold junction temperature any any

TC=Temperature compensation

Measuring range Units Abbreviation

Hi

Lo

Alrn

MESS

°C

CJ

10.1.3 Double display

On all double sensors incorporating a temperature sensor on the 1st channel the temperature value can at the same time be displayed in the function field.

Select 2 nd channel

Activate temperature display

Press and hold dow M▲

Return to channel display

Press and hold down M▲

10.2 Peak value memory

From the measured values acquired for each measuring point the highest and the lowest values are continuously recorded. To display these high/low peak values first the desired channel must be set (see Section 7.1) and then the

MAX

or

MIN

key must be pressed. As a check the display also includes the associated symbol.

To display the maximum value press key :

To display the minimum value press key :

To delete the maximum value press and hold down key :

To delete the minimum value press and hold down key :

MAX

MIN

MAX

MIN

.

.

.

.

To return to the measuring point display press key : .

As soon as you clear the memory, the current measured value will appear (because measuring is continuous).

10.3 Measured value memory

On the ALMEMO

®

2450-1L any measured value can be saved. To save the measured value press key :

MEM

.

The value most recently saved then appears in the function field preceded by the symbol

´M´. To return to the channel display press key :

M

.

18 ALMEMO ® 2450-1L

Relative measuring

10.4 Relative measuring

One very useful function is to zero the measured value at certain locations or at certain times as a reference value in order then to observe only the subsequent deviations. This function is independent of the locking status and does not modify the programming parameters in the connector.

To zero-set the measured value press key :

To display relative measuring press arrow :

CLR

.

REL

.

To return to normal measured value press and hold down key :

CLR

.

 Setting to zero automatically deletes the maximum and minimum values for this channel. The MAX, MIN, and MEM functions are thus also available for relative measurement.

11. DEVICE CONFIGURATION

On the ALMEMO

®

2450 measuring instrument a number of parameters can be configured. To do so when switching ON press and hold down key

MEM

. The function field should then show an abbreviation for the parameter and the main field should show the value currently set.

To select from all possible parameters,

if any are available, press keys : or

M

.

Locking the CLR key: see 11.2

Automatic switch OFF time in minutes: see 11.1

Loc

AOFF

To enter a value first press : starts flashing.

To modify the value press keys :

To delete parameters press :

Entry is completed by again pressing key :

ON

or

CLR

ON

To terminate configuration at any time press key:

MEM

and the value

M

ALMEMO ® 2450-1L 19

11. Device configuration

11.1 Automatic switch OFF

In menu item ´

AOFF´ an automatic device switch OFF time can be programmed in minutes; this will help save the batteries. This automatic device switch OFF will not take effect if the setting is ´- -´ or if a mains adapter or an interface cable is connected.

11.2 Device locking

The measured value in the main field of the display can be manipulated by pressing key

CLR

and setting it to zero. This function can be evaluated in different ways or even switched off in cases where there is a risk of accidentally activating relative measuring by zero-setting the measured value.

Loc parameter :

0 The offset is saved in RAM, base or zero-point - depending on locking

1 The offset is saved in RAM only.

2 Relative measuring is locked

12. TROUBLE-SHOOTING

The ALMEMO ® 2450-1L measuring instrument can be configured and programmed in many versatile ways. It is suitable for connecting a wide variety of different sensors. 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 invalid setting, or unsuitable cabling. In such event try to pinpoint and clear the problem with the aid of the following tests.

Error:

No display, display malfunction, keys do not react

Remedy: Check the power supply; replace the batteries; switch off and then

on again; if necessary re-initialize (see 7.3).

Error:

Measured values are incorrect.

Remedy: Switch Device OFF / ON, press key and hold CLR . Check all the sensor programming very carefully, especially the base value and zero-point.

Error:

Fluctuating measured values or the system hangs in mid-operation.

Remedy: Check the cabling for any inadmissible electrical connections,

Unplug any suspicious sensors.

Connect hand-held sensors in air or phantoms (for thermocouples short-circuit AB) and check.

Connect the sensors again one at a time and check successively.

If a fault persists for any one connection, then check all wiring; if necessary, insulate the sensor and eliminate interference by using shielded or twisted wiring.

Error: ´

CALEr´is displayed when the device is switched on.

Remedy: The calibration of a measuring range may have become misad-

20 ALMEMO ® 2450-1L

Trouble-shooting justed. 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 operating instructions, it must be returned to our factory in Holzkirchen with error description.

13. DECLARATION OF CONFORMITY

Ahlborn Mess- und Regelungstechnik GmbH declares herewith that measuring instrument ALMEMO ® 2590 carries the CE label and complies in full with the requirements of EU directives relating to low voltage and to electromagnetic compatibility (EMC) (89/336/EWG).

The following standards have been applied in evaluating the product.

Safety / security: EN 61010-1:2001

EMC: EN 61326: 2006

If a product is modified in any manner not agreed with us in advance, this declaration becomes void.

When using the sensor with an extension care must be taken to ensure that wiring is not laid alongside or close to high-voltage power cables and that it is, if necessary, properly shielded so as to prevent spurious interference being induced in the system.

The following advisory notes must be observed when operating the device :

Using the device in strong electromagnetic fields may aggravate measuring errors (<50 µV at 3 V/m and 1.5 meters thermocouple sensor). After exposure to such irradiation ceases, the device will again operate within its technical specifications

.

ALMEMO ® 2450-1L 21

14. Appendix

14. APPENDIX

14.1 Technical data

Measuring inputs :

Measuring channels:

A/D converter :

Measuring ranges:

(see Manual 2.3)

1 ALMEMO ® socket suitable for ALMEMO ® connectors maximum 3 additional channels for double sensors and function channels

Delta - sigma, 16-bit, 2.5 mops, adjustable 1 to 100 see Measuring range list Chap. 10.1.2 on page 20

Some measuring ranges differ from the standard

ALMEMO® ranges

9 volts, maximum 150 mA Sensor power supply :

Standard equipment :

LCD : Measured value : 5x 7-segment 15 mm,

2x 16-segment 9 mm

Function 4½ x 7-segment 9 mm, 9 symbols

7 silicone keys

1 Measured value on the RAM

Operation :

Memory :

Power supply :

Batteries :

Current consumption

Housing :

3 AA alkaline batteries approx. 10 mA (without input modules)

(LxWxH) 127 x 83 x 42 mm

ABS (acrylonitrile butadiene styrene), weight : approx. 260 g

Suitable conditions

Operating temperature

(storage temperature

Ambient relative humidity :

-10 to +50 °C

-20 to +60 °C)

10 to 90 % rH (non-condensing)

14.2 Product overview

Universal measuring instrument ALMEMO 2450-1L

1 measuring input , 2-row LCD, 7 keys, battery supply

Options

Measuring ranges for temperature display of 10 refrigerants

Top hat rail mounting

Order no.

MA 2450-1L

SB 0000-R

ZB 2450-HS

22 ALMEMO ® 2450-1L

14.3 Index

additional channels

AOFF

Automatic switch OFF

Battery operation

Connecting the transducers

Data buffering

Declaration of conformity

Device configuration

Device locking

Display

Double display faults

Function field

Functions

Functions channels

Housing

Initial commissioning

Introduction keypad

Keypad

Main field maximum value

Measured value

Measured value memory

Measuring inputs

Measuring inputs

Measuring operations

Measuring ranges minimum value

ON OFF operating states

Options

Order no.

Peak value memory

Power supply

Product overview reference value reinitialization

Relative measuring

Safety instructions

Scope of delivery

Selecting a measuring point

Index

16

17

18

15f.

15

22

22

18

11, 22

22

14

18

16

18

11

9

14

15

13

22

19

12

19

7

6

16

18

15

14

9

21

19

20

14

18

22

13

20

20

11

12

12

23

10

10.1.2

10.2

9.2

9.1

14.2

14.2

10.2

14.1

14.2

6

5

9

9.2

9.1

10.2

10.1

10.3

8.2

14.1

8.2

11.1

11.1

7.1

8

7.4

13

11

11.2

9

10.1.3

9.1

9.1

5.1

10.1.2

14.1

10.4

7.3

10.4

4

3.2

10.1.1

ALMEMO ® 2450-1L

14. Appendix

Sensor programming

Sensor supply

Standard equipment

Suitable conditions supply voltage monitoring

Switching ON / OFF

Technical data

Temperature compensation the measured value

To switch OFF

To switch ON

Transducers

Trouble-shooting

Warranty

Waste disposal

14.4 Your contact

AHLBORN Mess- und Regelungstechnik GmbH

Eichenfeldstraße 1

83607 Holzkirchen

Germany internet : http://www.ahlborn.com

e-mail : [email protected]

5.1.1

7.2

14.1

14.1

7.1

7.3

14.1

10.1.2

10.4

9.2

9.2

8.1

12

3.1

3.3

12

20

5

6

18

19

15

15

9

11

22

22

11

12

22

Even the greatest possible care cannot exclude the possibility of inaccuracies.

We reserve the right to make technical changes without advance notice.

24 ALMEMO ® 2450-1L