NIVELCO EasyTREK SCA-300 Series Manuale del proprietario

PROGRAMMING MANUAL

For SCA-3!!-4 models with HART

1st edition

Manufacturer:

NIVELCO Process Control Co.

H-1043 Budapest, Dugonics u. 11.

Tel.: (36-1)-369-7575 Fax: (36-1)-369-8585

E-mail:[email protected] http://www.nivelco.hu

Basic conception and elements of the ultrasonic measurement

LEV= level (calculated: H-DIST)

VOL= volume (calculated from LEV)

DIST=distance measured

Maximummeasuringdistanceofmtheunit(X)

FactorydefaultP04=X

Maximumoftheunitrange

FactorydefaultP05=X

Closeendblocking(X)

Max.measuringdistanceoftheapplication(H)

Programming:P04=H

Programmedrangeoftheapplication

Displayedrange

Factorydefault:P06=0

Farendblocking

Min.measuringdistance(X)

Programming:P05=>

CONTENTS

1. PARAMETERS – DESCRIPTIONS AND PROGRAMMING..........................................................................................................2

1.1 Measurement Configuration .........................................................................................................................................................................2

1.2 Current Output ..............................................................................................................................................................................................8

1.3 Relay Output.................................................................................................................................................................................................9

1.4 Measurement Optimisation.........................................................................................................................................................................10

1.5 Volume Calculation.....................................................................................................................................................................................15

1.6 Volume Flow Measuring .............................................................................................................................................................................16

1.7 32-Point Linearisation Curve ......................................................................................................................................................................21

1.8 Service Parameters ....................................................................................................................................................................................21

1.9 Additional Parameters of Flow Metering.....................................................................................................................................................22

2. ERROR CODES ...........................................................................................................................................................................23

3. TABLE OF PARAMETERS

4. SOUND VELOCITIES IN DIFFERENT GASES ...........................................................................................................................26

2 EasyTREK Compact Ultrasonic Level Transmitters

Thank you for choosing a NIVELCO instrument.

We are sure that you will be satisfied throughout its use.

1. PARAMETERS – DESCRIPTIONS AND PROGRAMMING

1.1 Measurement Configuration

P00: - cba Application/Engineering Units

Programming of this parameter will result in loading the factory default with the corresponding

engineering units.

aOperating (measurement) mode

0Liquid level measurement

bEngineering units (according to “c”)

Metric ft

0minch

1cm inch

cCalculation system

0Metric

1US

FACTORY DEFAULT: 000

EasyTREK Compact Ultrasonic Level Transmitters 3

P01: - - ba Measurement Mode

Displayed value on the PC, current output and the switching points of the relays will be interpreted in the engineering units of the (measured or

calculated) process value corresponding to the programmed measurement mode. On the other hand the higher the “a” of the programmed

parameter value the more (measured or calculated) process values can be displayed on the PC by the EVIEW software. (e.g. if P01=b0 only the

Distance, if P01=b5 the Distance the Level, the Volume and the Flow can be displayed. Exception if P01=b2 or b4.)

aMeasurement Mode Display symbol

0Distance DIST

1Level LEV

2Level in percentage LEV%

3Volume VOL

4Volume in percentage VOL%

5Flow FLOW

FACTORY DEFAULT: 11

P02: - cba Calculation units

aTemperature

0°C

1°F

This table is interpreted according to P00(c), P01(a) and P02(c) and is irrelevant in case of percentage measurement ( P01(a)= 2 or 4)

bVolume Weight (set also P32) Volume flow

Metric US Metric US Metric US

0m3ft3- lb (pound) m3/time ft3/time

1liter gallons tons tons liter/time gallons/time

cTime

0Sec

1Min

2Hour

3Day FACTORY DEFAULT: 000

4 EasyTREK Compact Ultrasonic Level Transmitters

P03: - - - a Values Displayed-Rounding

It is important to keep in mind that the instrument is measuring distance as basic quantity.

Measured distance Resolution

Xmin – 2m 1mm

2m – 5m 2mm

5m – 10m 5mm

The resolution depending on the distance can be considered as

a kind of rounding that will be contained in all further value (of

level, volume or volume flow) calculated. Therefore if

programmed for DIST or LEV measurement the setting of P03

is irrelevant.

Displayed VOL or FLOW

Displayed value Displayed form

0.000 – 9.999 x.xxx

10.000 – 99.999 xx.xx

100.000 – 999.999 xxxx.

1000.000 – 9999.999 xxxxx.

100000.000 – 99999.999 xxxxxx.

1 million – 9.99999*109x.xxxx : e

(exponential form)

over 1*1010 (overflow) Err4

Obviously the decimal position will be shifted with increasing

value displayed. (See table at the left).

Values over one million will be displayed in exponential format

whereas the value (e) represents the exponent. Over the value

of 1x1010 Err4 (overflow) will be displayed.

Rounding

Parameter value “a” Steps in the displayed

value

01 no rounding

310

420

550

A couple of millimetres of fluctuation of the basic DIST value (e.g. due to waves)

will be enlarged by the mathematical operations. This enlarged fluctuation in

displaying VOL or FLOW can (if disturbing) be avoided by rounding to be set in

P03. Rounding value 2, 5, 10 etc represents the steps by which the calculated

value will be changed in its (one or two) last digit(s).

Examples:

P03=1 steps by 2: 1,000; 1,002; 1,004

P03=5 steps by 50: 1,000; 1,050; 1,100 or 10,00; 10,05(0); 10,10(0); 10,15(0)

(the 0 from the steps 50, 100, 150 etc will not be displayed)

FACTORY DEFAULT: 0

EasyTREK Compact Ultrasonic Level Transmitters 5

P04: Maximum measuring distance (H)

The maximum measuring distance is the only one parameter that has to be programmed for each application other than distance

measurement mode. The DEFAULT value of P04 see table below:

EasyTREK Maximum measuring distance (XM)

Level transmitters (m/ft)

SCA-38_ 6 / 20

SCA-36_ 10 / 33

Keep in mind that

LEVEL (as the result of the measurement) = P04 (H value, programmed) – DISTANCE (measured by the device)

Since the accuracy of level (and all further calculated) value depends on the accuracy of the max measuring distance of the application which is

the distance between the sensor face and the tank / silo bottom.

To obtain the best accuracy for a liquid level measurement, measure this distance in the empty tank with the EasyTREK.

FACTORY DEFAULT: according to the table

6 EasyTREK Compact Ultrasonic Level Transmitters

P05: Minimum measuring distance (Close-end blocking)

The EasyTREK will not accept any echo within the blocking distance set here.

Automatic Close-end-blocking (Automatic Dead Band control) (P05= Xm)

By using the factory default value, the unit will automatically set the smallest possible close-end-blocking distance i.e. the dead band.

Manual close-end-blocking (P05> Xm)

Manual close-end-blocking would be used for example to block out the echo originating from the bottom rim of a stand-off pipe or from any object

protruding into the ultrasonic cone near to the transmitter.

By entering a value, higher than the factory default, the minimum measuring range will be extended and fixed to the specified value.

EasyTREK Minimum measuring distance (dead band)

Level transmitters (m/ft)

SCA-38_ 0,25 / 0,82

SCA-36_ 0,35 / 1,2

FACTORY DEFAULT: automatic dead band control

EasyTREK Compact Ultrasonic Level Transmitters 7

P06: Far-end blocking

A). Level measurement

Far end blocking is used to neglect incorrect

level/volume readings and output actions below a pre-

set level. In the far-end of the measuring range, for

example tanks with heaters or other interfering objects

(sludge, cone of silo etc.) may cause faulty readings.

If the level of the medium sinks below the blocked

out range:

-”Sub 0” will be indicated for the level and volume

below 1/8 value of P06

- Distance value is not interpretable

- Current output will hold value corresponding to

the far end blocking level

4mA

20mA

P06

Far end blocking

Level

Volume

"SUB 0" indication

below this level

If the medium level is above the blocked out range:

The calculation of level and volume will be based on the programmed tank dimensions, therefore the measured or calculated process values

will not be influenced in any way, by the far end blocking value.

B). Open channel flow metering

Far end blocking will be used to neglect incorrect volume flow readings and output actions

below a pre-set level, where accurate volume flow calculation is not possible any more.

If the liquid level in the flume/weir falls below the blocked out range:

The EasyTREK will act as follows:

-Indicate ”No Flow” on the Display (Q=0)

-Hold current value corresponding to Q=0

If the level in the flume/weir is above the blocked out range:

The calculation of volume flow will be based on the programmed flume/weir data, therefore

the measurement values will not be influenced in any way, by the far end blocking value.

FACTORY DEFAULT: 0

P04

P46

hP06

8 EasyTREK Compact Ultrasonic Level Transmitters

1.2 Current Output

P10: Value (of distance, level, volume or flow) assigned to 4 mA current output

P11: Value (of distance, level, volume or flow) assigned to 20 mA current output

Values are interpreted according to P01(a). Please note that in case of programming for (LEV or VOL) % measurement the min and max value

has to be entered in the relevant engineering units of LEV (m, ft) or VOL (m3, ft3).

Assignment can be made so that the proportion between the change of the (measured or calculated) process value and the change of the current

output be either direct or inverse. E.g. lev 1m assigned to 4mA and lev 10m assigned to 20mA represents direct proportion and lev 1m assigned

to 20mA and lev 10 m assigned to 4mA represents the inverse proportion.

FACTORY DEFAULT:

P10 (4mA); 0

P11 (20mA)

P12: - - - a Error indication by the current output

In case of error the EasyTREK will provide one of the current outputs below. (For errors and their indications see Chapter 7).

aError indication (according to NAMUR)

0Hold last value

13.6 mA

222 mA

FACTORY DEFAULT: 0

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