NIVELCO EasyTREK SCA-300 Series Owner's manual

PROGRAMMING MANUAL
For SCA-3!!-4 models with HART
1st edition
Manufacturer:
NIVELCO Process Control Co.
H-1043 Budapest, Dugonics u. 11.
Tel.: [phone] Fax: [phone]
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)
M
FactorydefaultP04=X
M
Maximumoftheunitrange
FactorydefaultP05=X
B
Closeendblocking(X)
B
Max.measuringdistanceoftheapplication(H)
Programming:P04=H
Programmedrangeoftheapplication
Displayedrange
Factorydefault:P06=0
Farendblocking
Min.measuringdistance(X)
m
Programming:P05=>
XX
Bm

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
12
25
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
mA
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

EasyTREK Compact Ultrasonic Level Transmitters 9
1.3 Relay Output
P13: - - - a Relay function
aRelay function Also set:
0DIFFERENTIAL LEVEL CONTROL
(Hysteresis control)
Relay is energised if the measured or calculated
value exceeds the value set in P14
Relay is de-energised if the measured or calculated
value descends under the value set in P15
Relay
Level
P14
P15
Time
Energised:
De-energised:
P14, P15
There is a need to set
(in level min 20mm)
hysteresis between
P14 and P15
1Relay is energised in case of Echo Loss -
2Relay is de-energised in case of Echo Loss -
3COUNTER
Used for open channel flow metering.
A 140 msec pulse is generated every 1, 10, 100,
1.000 or 10.000 m3according to P16.
P16= 0: 1m3
P16= 1: 10 m3
P16= 2: 100 m3
P16= 3: 1.000 m3
P16= 4: 10.000 m3
FACTORY DEFAULT: 2
P14: … Relay parameter – Setpoint value
P15: … Relay parameter – Setpoint value
P16: … Relay parameter – Pulse rate see P13(3)
FACTORY DEFAULT: P14=0, P15=0, P16=0

10 EasyTREK Compact Ultrasonic Level Transmitters
1.4 Measurement Optimisation
P20: - - - a Damping
Use this parameter to reduce unwanted fluctuation of the display and output.
LIQUIDSaDamping
time
(seconds) None/moderate
fume or waves
Heavy/dense fume or
turbulent waves
0no filter Recommended for testing only
13 applicable not recommended
26 recommended applicable
310 recommended recommended
430 recommended recommended
560 recommended recommended
6100 applicable applicable
7300 applicable applicable
8600 not applicable not applicable
91000 not applicable not applicable
FACTORY DEFAULT: 60 sec
P22: - - - a Dome top tank compensation
To reduce disturbing effect of possible multiple echos.
aCompensation Applied
0OFF In case the EasyTREK is mounted not in the centre of the top and the top is flat.
1ON In case the EasyTREK is mounted in the centre of a tank with dome-shaped top
FACTORY DEFAULT: 0

EasyTREK Compact Ultrasonic Level Transmitters 11
P23: - - - a Angle of repose (repose formation) Will not be used
P24: - - - a Target tracking speed
aTracking speed Remark
0Standard For most applications
1Fast For fast changing level
2Special Only for special applications
(measuring range is reduced to 50% of the nominal value)
The measuring window (P25) is inactive and the EasyTREK will respond practically instantly to any
target. Recommended to fast target tracking, but usually not applicable for level metering.
FACTORY DEFAULT: 0
P25: - - - a Selection of Echo within the measuring window
A so-called measuring window is formed around the echo signal. The position of this measuring window determines the flight time for calculation
of the distance of the target. (the picture below can be seen on the test oscilloscope)
Received
signal
amplitude
Echo 1.
t
"t" ultrasound flight time
Echo 2.
Some applications involve multiple (target + disturbing) echoes even within the measuring window. Basic echo selection will be done by the
Quest + software automatically. This parameter only influences the echo selection within the measuring window.
aEcho in the window to be selected Remark
0With the highest amplitude For most applications (both with liquids)
1First one For liquids applications with multiple echoes within the Measuring Window
2Largest one Recommended if multiple echoes within the Measuring Window
FACTORY DEFAULT: 0

12 EasyTREK Compact Ultrasonic Level Transmitters
P26: (m/h) Level elevation rate (filling speed)
P27: (m/h) Level descent rate (emptying speed)
Use these parameters to provide additional protection against echo loss in applications with very heavy fuming.
These parameters must not be smaller than the fastest possible filling/emptying rate of the actual technology.
For all other applications, use the factory default setting.
FACTORY DEFAULT: 2000

EasyTREK Compact Ultrasonic Level Transmitters 13
P28 - - - a Echo-loss handling
aEcho-loss error
indication
Remark
0Delayed During echo-loss, display and analogue output will hold last value.
If the echo-loss prevails for 10 sec plus the time period set in P20 (damping time), the reading on
the display will change to "no Echo"and the outputs will change according to the "Error Indication
Mode"preset in P12.
1None For the time of echo-loss, display and analogue output will hold last value.
2Advance to full During echo-loss in case of filling, the reading on the display and analogue output will shift towards
the "full"tank/silo state with a level elevation rate (filling speed) preset in P26
3Immediate In case of echo-loss, the display will immediately change to “no Echo” and the outputs will change
according to the "Error Indication Mode"preset in P12.
4No echo-loss indication in
case of empty tank/silo
Echo-loss may occur in completely empty tanks with a spherical bottom due to deflection of the
ultrasonic beam, or in case of silos with an open outlet.
If the echo is lost when the tank/silo is completely empty, the indication will correspond to empty
tank, in all other cases echo-loss indication will function according to the “Delayed”.
FACTORY DEFAULT: 0
P29 Blocking out of object #1
One fix object in the tank/silo that disturb the measurement can be blocked out.
Enter the distance of the object from the transducer. Use the Echo Map to read out the precise distance of disturbing objects.
FACTORY DEFAULT: 0

14 EasyTREK Compact Ultrasonic Level Transmitters
P31: Sound velocity at 20°C (m/sec or ft/sec depending on P00(c) )
Use this parameter if the sound velocity in the gases above the measured surface differs largely from that of in air.
Recommended for applications where the gas is more or less homogeneous. If it is not, the accuracy of the measurement can be improved using
the 32-point linearisation (P48, P49).
For sound velocities in various gases see section “Sound Velocities”.
FACTORY DEFAULT: Metric (P00: “EU”): 343.8 m/s, US (P00: “US”): 1128 ft/s
P32: Specific gravity
If you enter value (other than “0”) of specific gravity in this parameter, the weight will be displayed instead of VOL.
FACTORY DEFAULT: 0[kg/dm3] or [lb/ft3] depending on P00(c)

EasyTREK Compact Ultrasonic Level Transmitters 15
1.5 Volume Calculation
P40: - - ba Tank/silo shape
ba Tank/silo shape Also to be set
b0 Standing cylindrical tank shape: value of “b” as below bottom P40(b), P41
01 Standing cylindrical tank/silo with conical bottom P41, P43, P44
02 Standing rectangular tank/silo (with chute) P41, P42, (P43, P44, P45)
b3 Lying cylindrical tank shape: value of “b” as bellow bottom P40(b), P41, P42
04 Spherical tank P41
FACTORY DEFAULT: 00
P41-45: Tank/silo dimensions
Standing cylindrical tank/silo
with hemispherical bottom
Standing cylindrical tank/silo
with conical bottom
Standing rectangular tank/silo
with or without chute
b=0
P40
b=1
b=2
b=3
If no chute
P43, P44 and P45=0
Lying cylindrical tank Spherical tank
b=0
b=1
b=2
b=3
P40

16 EasyTREK Compact Ultrasonic Level Transmitters
1.6 Volume Flow Measuring
P40: - - ba Appliances, formula, data
ba Appliances, formula, data Also to be set:
Type Calculation formula Qmin [l/s] Qmax [l/s] “P” [cm]
00 GPA-1P1 Q[l/s]= 60.87*h1.552 0.26 5.38 30 P46
01 GPA-1P2 Q[l/s]= 119.7*h1.553 0.52 13.3 34 P46
02 GPA-1P3 Q[l/s]= 178.4*h1.555 0.78 49 39 P46
03 GPA-1P4 Q[l/s]= 353.9*h1.558 1.52 164 53 P46
04 GPA-1P5 Q[l/s]= 521.4*h1.558 2.25 360 75 P46
05 GPA-1P6 Q[l/s]= 674.6*h1.556 2.91 570 120 P46
06 GPA-1P7 Q[l/s]= 1014.9*h1.556 4.4 890 130 P46
07 GPA-1P8 Q[l/s]= 1368*h1.5638 5.8 1208 135 P46
08
Nivelco Parshall flume
GPA-1P9 Q[l/s]= 2080.5*h1.5689 8.7 1850 150 P46
09 General PARSHALL flume P46, P42
10 PALMER-BOWLUS (D/2) P46, P41
11 PALMER-BOWLUS (D/3) P46, P41
12 PALMER-BOWLUS (Rectangular) P46, P41, P42
13 Khafagi Venturi P46, P42
14 Bottom-step weir P46, P42
15 Suppressed rectangular or BAZIN weir P46, P41, P42
16 Trapezoidal weir P46, P41, P42
17 Special trapezoidal (4:1) weir P46, P42
18 V-notch weir P46, P42
19 THOMSON (90°-notch) weir P46
20 Circular weir P46, P41
21 General flow formula: Q[l/s]= 1000*P41*hP42, h [m] P46, P41, P42

EasyTREK Compact Ultrasonic Level Transmitters 17
P41-45: Flume/weir dimensions
See next pages.
FACTORY DEFAULT: 0
P46:Distance between transducer face and level of Q=0
P46 is always the distance between the transducer face and the level, where the volume flow is 0.
FACTORY DEFAULT: 0
Flume / Weir Dimensions
P40= 00
.
.
.
08
Nivelco Parshall flumes (GPA1P1 … GPA-1P9)
For further details see the Manual of the Parshall flume
Sensor
P46
Sensor
P40= 09 General Parshall flume
0.305 < P42(width) <2.44
0.026
Q[m3/s]= 0.372*P42*(h/0.305)1.569*s
2.5 < P42
Q[m3/s]= K*P42*h1.6
P= 2/3*A
A
h
P46
Sensor
Sensor
P42
P
s[m] K
3.05 2.450
4.57 2.400
6.10 2.370
7.62 2.350
9.14 2.340
15.24 2.320

18 EasyTREK Compact Ultrasonic Level Transmitters
P40= 10 Palmer-Bowlus (D/2) flume
Q[m3/s]= f(h1/P41)*P412.5,
where h1[m]= h+(P41/10)
P04
P46
h
P41
D
D/10
P40= 11 Palmer-Bowlus (D/3) flume
Q[m3/s]= f(h1/P41)*P412.5,
where h1[m]= h+(P41/10)
P04
P46
h
P41
D
D/10
P40= 12 Palmer-Bowlus (Rectangular) flume
Q[m3/s]= C*P42*h1.5,
where C= f(P41/P42)
D
P42
P46
P04
h
D/10
P41