Table of Contents
Related Manuals for NIVELCO EasyTREK SCA-300 Series
Summary of Contents for NIVELCO EasyTREK SCA-300 Series
- Page 1 PROGRAMMING MANUAL For SCA-3!!-4 models with HART edition Manufacturer: NIVELCO Process Control Co. H-1043 Budapest, Dugonics u. 11. Tel.: (36-1)-369-7575 Fax: (36-1)-369-8585 E-mail:sales@nivelco.hu http://www.nivelco.hu...
- Page 2 Basic conception and elements of the ultrasonic measurement DIST=distance measured LEV= level (calculated: H-DIST) VOL= volume (calculated from LEV)
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Page 3: Table Of Contents
C O N T E N T S PARAMETERS – DESCRIPTIONS AND PROGRAMMING......................2 Measurement Configuration ..................................2 Current Output ......................................8 Relay Output.........................................9 Measurement Optimisation..................................10 Volume Calculation.....................................15 Volume Flow Measuring .....................................16 32-Point Linearisation Curve ..................................21 Service Parameters ....................................21 Additional Parameters of Flow Metering..............................22 ERROR CODES ...................................23 TABLE OF PARAMETERS SOUND VELOCITIES IN DIFFERENT GASES ...........................26... -
Page 4: Parameters - Descriptions And Programming
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. - Page 5 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.
- Page 6 P03: - - - a Values Displayed-Rounding It is important to keep in mind that the instrument is measuring distance as basic quantity. Measured distance Resolution The resolution depending on the distance can be considered as a kind of rounding that will be contained in all further value (of –...
- Page 7 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 (X Level transmitters (m/ft) SCA-38_...
- Page 8 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= X 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>...
- Page 9 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.
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Page 10: Current Output
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 (m , ft Assignment can be made so that the proportion between the change of the (measured or calculated) process value and the change of the current... -
Page 11: Relay Output
1.3 Relay Output P13: - - - a Relay function Relay function Also set: DIFFERENTIAL LEVEL CONTROL P14, P15 Level (Hysteresis control) There is a need to set Relay is energised if the measured or calculated (in level min 20mm) value exceeds the value set in P14 hysteresis between Time... -
Page 12: Measurement Optimisation
1.4 Measurement Optimisation P20: - - - a Damping Use this parameter to reduce unwanted fluctuation of the display and output. Damping LIQUIDS time None/moderate Heavy/dense fume or (seconds) fume or waves turbulent waves no filter Recommended for testing only applicable not recommended recommended... - Page 13 P23: - - - a Angle of repose (repose formation) Will not be used P24: - - - a Target tracking speed Tracking speed Remark Standard For most applications Fast For fast changing level Special 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.
- Page 14 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.
- Page 15 P28 - - - a Echo-loss handling Echo-loss error Remark indication Delayed 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"...
- Page 16 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).
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Page 17: Volume Calculation
1.5 Volume Calculation P40: - - ba Tank/silo shape Tank/silo shape Also to be set Standing cylindrical tank shape: value of “b” as below bottom P40(b), P41 Standing cylindrical tank/silo with conical bottom P41, P43, P44 Standing rectangular tank/silo (with chute) P41, P42, (P43, P44, P45) Lying cylindrical tank shape: value of “b”... -
Page 18: Volume Flow Measuring
1.6 Volume Flow Measuring P40: - - ba Appliances, formula, data Appliances, formula, data Also to be set: Type Calculation formula Qmin [l/s] Qmax [l/s] “P” [cm] GPA-1P1 Q[l/s]= 60.87*h 0.26 5.38 1.552 GPA-1P2 Q[l/s]= 119.7*h 1.553 0.52 13.3 GPA-1P3 Q[l/s]= 178.4*h 0.78 1.555... - Page 19 P46 is always the distance between the transducer face and the level, where the volume flow is 0. FACTORY DEFAULT: Flume / Weir Dimensions P40= 00 Nivelco Parshall flumes (GPA1P1 … GPA-1P9) For further details see the Manual of the Parshall flume Sensor Sensor...
- Page 20 P40= 10 Palmer-Bowlus (D/2) flume /s]= f(h1/P41)*P41 where h1[m]= h+(P41/10) D/10 P40= 11 Palmer-Bowlus (D/3) flume /s]= f(h1/P41)*P41 where h1[m]= h+(P41/10) D/10 P40= 12 Palmer-Bowlus (Rectangular) flume /s]= C*P42*h where C= f(P41/P42) D/10 EasyTREK Compact Ultrasonic Level Transmitters...
- Page 21 15cm P40= 13 Khafagi Venturi flume /s]= P42*1.744*h + 0.091*h Sensor Sensor P40= 14 Bottom step weir 0.0005 < Q[m /s] < 1 0.3 < P42[m] < 15 0.1 < h[m] < 10 /s]= 5.073*P42*h Accuracy: ± P40= 15 Suppressed rectangular or BAZIN weir 0.001 <...
- Page 22 P40= 17 Special Trapezoidal (4:1) weir 0.0018 < Q[m /s] < 50 0.3 < P42[m] < 10 0.1 < h[m] < 2 /s]= 1.866*P42*h Accuracy: ± P40= 18 V-notch weir 0.0002 < Q[m /s] < 1 20 < P42[°] < 100 0.05 <...
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Page 23: 32-Point Linearisation Curve
1.7 32-Point Linearisation Curve P47: - - - a Linearisation Linearisation is the method of assigning requested (calibrated or calculated) level, volume or flow to values measured by the transmitter. It can be used for instance if the sound velocity is not known (LEVEL⇒LEVEL) or in the case of vertical cylindrical tank (LEVEL ⇒ VOLUME) etc. -
Page 24: Additional Parameters Of Flow Metering
P71: Distance of the of Measuring Window (read-out parameter) P72 Amplitude of the Echo in the Measuring (read-out parameter) P73:(msec) Echo Position (time) (read out parameter) P74: Signal To Noise Ratio (read out parameter) Ratio Measurement conditions Over 70 Excellent Between 70 and 30 Good Under 30... -
Page 25: Error Codes
2. ERROR CODES Error Error description Causes and actions to be done Code Memory error Contact local agent No Echo Echo loss No echo received (no reflection) Hardware error Contact local agent Overflow Check settings Code referring to sensor error or improper Verify sensor for correct operation and check for installation/mounting, level in the dead band correct mounting according to Users Manual... -
Page 26: 3. Table Of Parameters
3. TABLE OF PARAMETERS Par. Page Description Code Par. Page Description Code Application/Engineering Units Echo-loss handling Measurement Mode Blocking sout of object #1 Calculation units N.A. Values Displayed-Rounding Sound velocity at 20°C Maximum measuring distance Specific gravity Minimum measuring dist. (Close-end blocking) N.A. - Page 27 Par. Page Description Code Par. Page Description Code N.A. TOT2 volume flow totaliser (non-resetable) N.A. N.A. N.A. N.A. N.A. N.A. Overall operating hours of the unit N.A. Time elapsed after last switch-on N.A. Operating hours of the relay N.A. Number of switching cycle of the relay N.A.
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Page 28: Sound Velocities In Different Gases
4. SOUND VELOCITIES IN DIFFERENT GASES The following table contains the sound velocity of various gases measured on 20°C. Gases Sound Velocity (m/s) Acetaldehyde 252.8 Acetylene 340.8 Ammonia 429.9 Argon 319.1 Bensol 183.4 Carbon dioxide 268.3 Carbon monoxide 349.2 Carbon tetrachloride 150.2 Chlorine 212.7...