Ahlborn ALMEMO 2290-2/3 Скачать руководство пользователя страница 30 | Manualshive

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7.1.5 Averaging

The

average value

of the measured value is required for various applications:

e.g.

- the average flow velocity in a ventilating channel
- smoothing of a largely varying measured value (wind, pressure etc.)
- hourly or daily average values of weather data (temp., wind etc.)
- as above, of consumption values (current, water, gas etc.)

The average value of a measured value results when a number of measured
values M

i

are added together and then divided by the number N of the

measured values:

Average Value M =

i

(

Σ

M

i

)

/N

For using the average value

three functions are available,

AVERAGING MODE

´

AM

´,

AVERAGE VALUE

´

AV

´ and

COUNT

´

C

´ (function activation, see 5.2).

The type of averaging

is set via the averaging mode ´

MM

´ and can be recalled

with using the key

F2

.

Function AVERAGING MODE

´

AM

´

Select by using the key

F2...

...

F2

1:S t S t P

AM

The following modes can be set with using the keys

long

,

,

ENTER

if a sensor with an ALMEMO

®

connector is plugged in:

ENTER

Function

Display

No averaging:

- - - -

Averaging over Measuring Point Scans:
Continuous averaging over all cycles:

C o n t

Averaging over all measuring cycles of a print cycle:

C Y C L

Manual Averaging over Measured Values of a Channel:
Continuous average value from start to stop via keyboard

S t S t P

Aver. val. over single measurements that are captured via 'hold'

S i n G L

Manual Averaging

In this section manual averaging over measured values of the selected channel
will be described. The averaging over measuring point scans can be found in
the manual section 6.7.4.

Averaging over Time

To obtain the average value of all measured values of a measuring channel
over a specified time period, the averaging mode

´StStP´

must be set for the

selected measuring channel. For example, by uniformly scanning an area, this
mode also allows to determine the average flow velocity in an air vent (see
manual 3.5.5). For distinguishing between the manual and the cyclic averaging
the following requirements must be met:

30

ALMEMO



2290-2/3

Continuous Measurement of a Measuring Point

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Содержание ALMEMO 2290-2/3

Страница 1: ...ing Instructions Multifunctional Measuring Instruments ALMEMO 2290 2 3 V1 1 17 08 1999 AHLBORN Mess und Regelungstechnik GmbH Eichenfeldstraße 1 3 D 83607 Holzkirchen Tel 49 0 8024 30070 Fax 49 0 8024 300710 ...

Страница 2: ...IAL OPERATION 11 3 POWER SUPPLY 12 3 1 Battery Operation Rechargeable Battery Operation 12 3 2 External Power 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 KEYBOARD 17 5 1 Display 17 5 2 Selecting and Activating Functions 18 5 3 Keyboard 19 5 4 Data Input 20 2 ALMEMO 2290 2 3 Table...

Страница 3: ...ory for Peak Values 29 7 1 5 Averaging 30 7 1 6 Volume Flow Measurement 32 7 1 7 Setting the Measured Value to Zero Zero Point Correction 33 7 1 8 Atmospheric Pressure Compensation 34 7 1 9 Temperature Compensation 34 7 2 Single Measuring Point Scan 35 7 3 Cyclic Measuring Point Scan 35 7 3 1 Print Cycle 36 7 3 2 Measuring Cycle 36 7 3 3 Time and Date 36 8 ANALOGUE OUTPUT 37 8 1 Scaling 37 9 DIGIT...

Страница 4: ... 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...

Страница 5: ...o 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 function channels for special measuring tasks are provided to determine temperature coefficient Q t...

Страница 6: ... 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...

Страница 7: ...area or diameter of air vents and calculating the volume flow The average flow velocity can be roughly determined by measuring the whole cross section area or by accurate net measurements according to DIN For dynamic pressure probes a temperature and an atmospheric pressure compensation is available With corresponding environmental conditions these values can be entered manually or automatically m...

Страница 8: ...iggered individually 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 ...

Страница 9: ...ZB 2290 NA 12V 200mA Connector cable ZB 5090 EK 7 13V DC 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 for spare battery 5 LCD Display a Symbols for operating modes U battery 7 V BAT CORR Correction of meas val AVERAGE Averaging START Measuring point scan HOLD Memory for moment val RS232 Output of meas val F1 Meas...

Страница 10: ...ing Functions Range R Limit value Max Hi LH Limit value Min Lo LL Zero point correction ZC Slope correction gain SC Ambient temperature AT Emissivity factor EF Base value BA Factor FA Exponent EX Averaging mode AM Cross section area CS Diameter normalised DN Atmospheric pressure mb Temperature compensation TC Analogue output start AS Analogue output end AE Baud rate BR Device address A Locking mod...

Страница 11: ...7 3 3 Use key F1 to select function PRINT CYCLE PC and program the print cycle see 7 3 1 Use key START STOP to start and stop the cyclic meas point scan see 7 3 6 Monitoring of limit values Enter limit values see 6 4 Use key F1 to select function MEAS CYCLE MC and program the measuring cycle see 7 3 2 Connect alarm device with alarm module to socket OUT2 see manual 5 1 2 5 1 3 If required use an i...

Страница 12: ...tteries 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 illumin...

Страница 13: ...e not charged when delivered If NiCD cells are only partly discharged the full capacity cannot be reached by a normal recharging Therefore use the instrument until the rechargeable batteries are completely discharged Completely recharge the rechargeable batteries afterwards As a result the life of the rechargeable batteries is significantly increased Completely recharged batteries will slowly disc...

Страница 14: ...viour due to interference influences e g electrostatical charging or wrong connection of peripheral devices or if incorrect programming must be avoided the device can be completely reinitialised The reset can be achieved if the key CLEAR is pressed during switch on Apart from the measuring data the time and date and all internal data such as cycles conversion rate and atmospheric pressure and the ...

Страница 15: ...ed 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 2 has 1 input socket 2 the ALMEMO 2290 3 has 2 input sockets CH1 and CH2 and additionally a differential channel CH3 CH1 CH2 However ALMEMO sensors can if required provide up to 4 channels The additional channels can be e...

Страница 16: ...ithin 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 CH1 of the device 16 ALMEMO 2290 2 3 Connection of the Transducers ...

Страница 17: ... or scaling arrow CORR illuminated Measuring point scan in progress arrow START illuminated Memory for momentary values arrow HOLD illuminated Measuring point scan with output arrow V24 illuminated Measuring function selected arrow F1 illuminated Programming function selected arrow F2 illuminated Alarm Conditions are displayed as follows and cause an alarm see manual 6 3 9 Sensor breakage abbr fla...

Страница 18: ...vate all functions by switching on with key held pressed ENTER The functions can be selected by repeatedly pressing the keys F1 and F2 If the key is pressed for longer than one second the previous function can be recalled The functions can be identified by a two digit abbreviation that is displayed in place of the dimension as given in the table below MEAS VALUE F1 Meas Functions F2 Programm Value...

Страница 19: ... by the formerly required programming modules The additionally activated functions can be cleared by pressing the key CLEAR when switching the device on 5 3 Keyboard The keyboard 6 has the following functions that are displayed above the keys Function Normal Enter Start and stop of meas point scans START STOP ENTER Selecting the measuring points CH CLEAR Meas value MEAS VAL Selecting the measuring...

Страница 20: ...ycle restarts from zero The digit can be decreased using the key After falling below zero the maximum value follows 9 or 5 The sign can be changed using the key A switch the next digit is performed using the key ENTER ENTER To switch back to the previous digit by long pressing ENTER 1s ENTER The programming process is complete after setting the last digit and again operating the key ENTER Programm...

Страница 21: ...ng channel i e the measurement is not being interrupted Increase the input channel by programmed channels only CH Decrease the input channel by press and hold approx 1 sec CH 1s 6 2 Selecting the Measuring Range If users want to program the connectors on their own or frequently change the measuring range it is necessary that the locking is cleared see 6 7 and special connectors may be required for...

Страница 22: ...UFE Ntc type N ZA 9000 FS 30 00 125 00 C Ntc Millivolt 1 ZA 9000 FS 26 000 26 000 mV U 26 Millivolt ZA 9000 FS 10 000 55 000 mV U 55 Millivolt 2 ZA 9000 FS 260 00 260 00 mV U260 Volt ZA 9000 FS 2 6000 2 6000 V U2 60 Differential Millivolt 1 ZA 9050 FS 26 000 26 000 mV d 26 Differential Millivolt ZA 9050 FS 10 000 55 000 mV d 55 Differential Millivolt 2 ZA 9050 FS 260 00 260 00 mV d260 Differential...

Страница 23: ...erature FN A846 30 00 125 00 C P Ht Rel humidity psychr w PC FN A846 0 0 100 0 H P RH Mixture ratio w PC FN A846 0 0 500 0 g kg P AH Dew point temperature w PC FN A846 25 0 100 0 C P dt Partial vapour pressure w PC FN A846 0 0 1050 0 mbar P UP Enthalpy w PC FN A846 0 0 400 0 kJ kg P En Conductivity probe w TC FY A641 LF 0 0 20 000 mS LF CO2 sensor FY A600 CO2 0 0 2 500 CO2 O2 saturation w TC a PC ...

Страница 24: ...l letters the characters Ω and spaces _ are available The dimension is indicated by two 16 segment characters that are indicated following the measuring and programming values The change of the dimension can be performed within the function MEAS VALUE by pressing the key The first character of the dimension ENTER will flash in the display It can then be changed by using the keys and When the first...

Страница 25: ...cted Meas Value Meas Value ZERO POINT x SLOPE Function ZERO POINT CORRECTION ZC Select by using the key F2 F2 1 0 0 3 2 ZC Programming Input according to 5 4 Clearing with the keys long CLEAR ENTER 1 ZC Function SLOPE CORRECTION SC Select by using the key F2 Input according to 5 4 1 1 5 0 0 0 SC If correction values are programmed and as a result the measured value is corrected the arrow CORR will...

Страница 26: ...O2 6 6 Scaling Decimal Point Setting For indicating the electrical signal of a sensor as a measured value of a physical variable it is in most cases necessary to set a zero point shift and to perform a multiplication with a certain factor The functions BASE BA FACTOR FA and EXPONENT EX are available for this A detailed description of the scaling including an example can be found in the manual sect...

Страница 27: ...e BA and factor FA must be activated and unlocked see 6 7 6 7 Locking the Programming of the Sensor man 6 3 12 The function parameters of each measuring point are protected by the locking mode up to an adjustable locking level Before any programming is performed the locking mode must be correspondingly lowered If a dot is indicated following the locking mode on the display then a modification is n...

Страница 28: ...cified conversion rate see 6 5 4 This is the best operating mode for a registration with the analogue output 7 1 1 Selecting the Measured Value and Measuring Point After switch on the function MEAS VALUE is automatically set and the measuring point CH1 of the first sensor is selected i e the measured value M1 is indicated on the display After activating other functions by operating the keys F1 and...

Страница 29: ...an be activated In this ENTER function the measured values of both sensors involved are determined and the arithmetic difference is indicated on the display and provided as output to the analogue output The difference is only available if both sensors have the same measuring range e g NiCr Ni 7 1 4 Memory for Peak Values From the measured values that are obtained from each measuring point the maxi...

Страница 30: ...n ALMEMO connector is plugged in ENTER Function Display No averaging Averaging over Measuring Point Scans Continuous averaging over all cycles C o n t Averaging over all measuring cycles of a print cycle C Y C L Manual Averaging over Measured Values of a Channel Continuous average value from start to stop via keyboard S t S t P Aver val over single measurements that are captured via hold S i n G L...

Страница 31: ...tinuous measuring point scan no C in conversion rate 1 Before each measurement the average value must be cleared in the function AVERAGE VALUE by using the keys long CLEAR ENTER 2 In the function MEAS VALUE the single values are captured in the memory for instant values by pressing the key MEAS VAL The arrow HOLD appears in the display 3 If the value is correct it can be transferred into the memor...

Страница 32: ...nd man 3 5 5 e g 13 24 m s Function AVERAGE VALUE AV Select by using the key F1 Display m s v Entering the Cross Section Area The cross section area CS can either be directly entered within the function CS with 32000cm2 at maximum or within the function DN via the diameter with 2000mm at maximum see 5 4 Function CROSS SECTION AREA CS Select by using the key F2 Input cm2 see 5 4 Function DIAMETER D...

Страница 33: ...stem see above is sufficient However if the function BA is available is selected with using the key F2 and the base value is cleared by using the keys long CLEAR ENTER Function BASE BA with key Clear base F2 ENTER 1s CLEAR Zero Point Adjustment Many sensors must be adjusted at least once or at regular intervals to compensate for instabilities For this purpose a specific zero point adjustment is av...

Страница 34: ...mb It can be set to the actual value by the usual data entry see 5 4 7 1 9 Temperature Compensation Sensors with measured values that are strongly depending on the temperature of the measuring medium are in most cases equipped with a specific temperature sensor and the instrument will automatically perform a temperature compensation see measuring range list 6 2 w TC However dynamic pressure probes...

Страница 35: ... in addition the arrow RS232 is indicated print output see manual 6 6 1 With each press of the key the measured values are correspondingly processed If the true daytime has to be indicated as the measuring time it must first be set see 7 3 3 Single Measuring Point Scan Key cycles 00 00 00 START STOP 7 3 Cyclic Measuring Point Scan see manual 6 5 1 2 For cyclic measuring point scans the measuring o...

Страница 36: ...on rate can be switched on or off by using the key CH s man 6 5 1 3 For control a dot is indicated following the measuring cycle The measuring cycle can be cleared or stopped using the keys long CLEAR ENTER 7 3 3 Time and Date The ALMEMO 2290 2 3 is equipped with a clock with date function As it is not battery backed time and date are cleared when the device is switched off Function TIME TM Select...

Страница 37: ...the initial value is zero it will remain cleared For activating the functions AS and AE see 5 2 Analogue Output Start Select by using the key F2 Input see 5 4 Analogue Output End Select by using the key F2 Input see 5 4 Example meas range 10 0 to 50 0 C These two parameters analogue output start and analogue output end are also stored in the EEPROM of the sensor and can therefore be individually p...

Страница 38: ... within the function BAUD RATE BR via keyboard The input is started with long pressing the key The display will ENTER start to flash and can be modified by using the keys and When the desired transmission rate has been selected the programming can be terminated by operating the key once again The baud rate setting ENTER will be stored in the EEPROM of the interface module and will then be valid fo...

Страница 39: ...umbers This can be performed by using the function DEVICE ADDRESS A It can be selected with the key F2 and the currently set device number is displayed which is usually factory set to 00 It can then be modified by normal data entry see 5 4 Function DEVICE ADDRESS A Select by using the key F2 Input see 5 4 F2 0 1 A Example address 01 Only successive numbers between 01 and 99 should be entered for n...

Страница 40: ...F2 FACTOR 01 1 0350E 1 EXPONENT EX F2 FACTOR 01 1 0350E 1 AVG MODE AM F2 01 NiCr 0123 4 0012 0 0000 0 C 1 0000 E 0 STSTOP CROSS SECTION CS F2 CROSS SECT 01 00078 cm2 DIAMETER 00100 mm DIAMETER DN F2 CROSS SECT 01 00078 cm2 DIAMETER 00100 mm ANALOG START AS F2 ANALOG START 01 0000 0 C ANALOG END AE F2 ANALOG END 01 0100 0 C ATM PRESSURE DEVICE ADDR Dev Programming mb A F2 F2 DEVICE G00 M11 A01 P03 ...

Страница 41: ... blockage during operation Remedy Check cabling for inadmissible electrical connection Disconnect external power supply and output modules Disconnect all suspicious sensors and replace them by hand held sensors operated in air or by dummies short circuit AB at thermocouples 100Ω at Pt100 sensors If the error is corrected by this check the wiring isolate the sensor if necessary prevent influences f...

Страница 42: ...n Holzkirchen Germany including a short report and possibly control printouts The software AMR Control allows to print the monitor pages including the programming and also to save the terminal operation and to print it out 11 ELECTROMAGNETIC COMPATIBILITY The data loggers ALMEMO 2290 2 3 meet the electromagnetic compatibility EMC safety requirements specified in the relevant CE directive issued by...

Страница 43: ...dules 2290 3 ca 7 mA see above Housing 180x85x33mm ABS high impact strength 70 C max Operating temperature 10 to 60 C Storage temperature 30 to 60 C Humidity of ambient air 10 to 90 rH non condensing Extent of the delivery Measuring Instrument ALMEMO 2290 2 3 Operating Instructions ALMEMO 2290 2 3 ALMEMO Manual incl software AMR Control Product Overview Order No Multifunctional Measuring Instrumen...

Страница 44: ...44 ALMEMO 2290 2 3 Appendix ...

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