Measuring the level of petroleum in the tanks, containers.

IR supplies equipment for the measurement volume of oil and other liquids in tanks and containers.

IR carries out installation of measuring equipment, connectivity and visualization of the measurement process in real time.

IR offers for the supply and installation of a variety of level measurement system, for example -Brand DUU4M.

 Figure. Placing level sensors and valves electrically operated

                                                                                                                                                                                                           

  1 Purpose

The DUU4M float level gauges (hereinafter referred to as the "level gauges") are designed for measuring the level of various fluids and levels of media separation of multiphase fluids (oil – emulsion – service water, etc.), as well as for measuring the temperature and pressure of the medium under monitoring.

The level gauges are used in automation systems employed in production facilities of oil-and-gas, petrochemical, chemical, electric-power, metallurgy, food and other industries, which use apparatuses with an atmospheric or excess pressure (up to 2.0 MPa).

The level gauges are to be installed on objects within zones of classes 1 and 2 in compliance with GOST R 51330.9. These zones are characterized by possible formation of mixtures of combustible gases and vapors with air. The mixtures belong to category IIB according to GOST R 51330.11 of temperature class T5 inclusive in conformity with GOST R 51330.0.

The level gauges are entered in the State Register of Measuring Equipment.

The level gauges are made in the explosion-proof version in compliance with the requirements set forth in GOST R 51330.0 and GOST R 51330.10. Their explosion-proof system is of the "Spark-proof electric circuit" type with the explosion-proof level for explosion-hazardous mixtures of category IIB according to GOST R 51330.11 and of temperature class T5 in compliance with GOST R 51330.0. The transmitters have the 1ExibIIBT5 X marking in conformity with GOST R 51330.0.

The level gauges are intended for formation of automation systems integrally with the GAMMA-11 controller produced by JSC "Albatros". 

 2 Medium to Be Monitored

Oil, oil products, solvents, liquefied gases, acids, alkali and other corrosive and non-corrosive media. The resistance of the transmitters and level gauges to corrosive media is limited by materials used, which are in contact with the medium under monitoring. These materials include the 12Kh18N10T stainless steel, stainless steel 1.4435 (for the DUU4M-05 to DUU4M-08 transmitters), polytetrafluo-rethylene, the spheroplastic of the EDS-7AP type, TU6-05-221-625-82 (in case of employment of floats of the appropriate type).

    

3 Composition of Devices

3.1 The DUU4M level gauge consists of the DUU2M transmitter of version 1 with according model No, providing measurement of current values of parameters under monitoring and issuing the data on results of measurements.

It also incorporates the BTVI3 or BII3 (depending on the set, see Item 3.2 of the present Section) providing power supply to the transmitter connected to it and shaping of data output signals on the basis of results of measurements made by the transmitter.

3.2 Depending of the output signal type, the level gauges are manufactured in the following sets:
– the DUU4M-TV set comprises one of the DUU2M ultrasonic level transmitters of version 1, providing direct measurement of current values of parameters (see Table II.6.1) and the spark-proof current output unit 3(hereinafter referred to as "the BTVI3");
– the DUU4M-RS set comprises one of the DUU2M ultrasonic level transmitters of version 1 and the spark-proof interface unit 3 (hereinafter referred to as "the BII3").

3.3 The transmitter is connected to the BTVI3 or BII3 unit with the aid of the shielded four-wire cable. See characteristics of the cable in Item 4.8.7 of the present Section.

3.4 The DUU4M-TV sets shape current signals of 4.0 to 20 mA. Values of these signals contain the information about values of measured parameters (the number of current signals corresponds to the number of parameters to be measured by the transmitter).

3.5 The DUU4M-RS sets have output signals in the form of the RS-485 serial interface with the transmission of measurement results being organized in the format of the Modbus RTU protocol.

3.6 The assortment of the produced transmitters and level gauges is dictated by the number of parameters to be measured by them and the output signal type. Depending upon the number of parameters under monitoring, both the transmitters and level gauges differ by Nos of models, whose characteristics are given in Table II.6.1.

Table II.6.1 

Transmitter type, model No.

Parameters to be measured

Number of floats

Sensitive element type

1

DUU4М-01

level (media separation level)

1

rigid

2

DUU4М-02,
DUU4М-02T*

level (media separation level), temperature 

1

rigid

3

DUU4М-03

level (media separation level), media separation level

2

rigid

4

DUU4М-04

level (media separation level), media separation level, temperature

2

rigid

5

DUU4М-05

level (media separation level), pressure

1

rigid

6

DUU4М-06

level (media separation level), temperature, pressure

1

rigid

7

DUU4М-07

level (media separation level), media separation level, pressure

2

rigid

8

DUU4М-08

level (media separation level), media separation level, temperature, pressure

2

rigid

9

DUU4М-10,
DUU4М-10T**

level (media separation level), temperature

1

flexible

10

DUU4М-12

level (media separation level), media separation level, temperature

2

flexible

11

DUU4М-14

level (media separation level), media separation level, media separation level, temperature

3

flexible

12

DUU4М-16

level (media separation level), media separation level, media separation level, media separation level, temperature

4

flexible

  
 *The DUU4M-02 and the DUU4M-02T level gauges vary in the temperature range of the medium under monitoring (see Item 2, Table II.6.2)

**The DUU4M-10 and the DUU4M-10T level gauges vary in the temperature range of the medium under monitoring (see Item 2, Table II.6.2)

3.7 The level gauges are equipped with floats of type I, II or IV (level) and III or V (media separation level). Section II.9 of the present Catalogue contains characteristics of the floats.

3.8 The DUU4M-01, -02, -02T, -03, to -08 level gauges comprise rigid sensitive elements (SE), while the DUU4M-10, -10T, -12, -14, -16 level gauges are furnished with flexible sensitive elements.

4 Specifications

4.1 Table II.6.2 shows the basic specifications and operating conditions of the transmitters and units.

Table II.6.2 
 

No.

Parameter

DUU2M transmitter of version 1 of DUU4M level gauge

BTVI3, BII3

1.

Sensitive element length

from1.5 to 4.0 m (rigid SE);
from 1.5 to 25 m (flexible SE)

2.

Temperature of medium under monitoring

from minus 45 to +65 °C 
(for the DUU2M-01 to -08, -10, -12, -14, -16); 
from minus 45 to +120 °C 
(for the DUU2M-02T);
from minus 10 to +100 °C 
(for the DUU2M-10T)

3.

Pressure of medium under monitoring

up to 2.0 MPa (rigid SE); 
up to 0.15 MPa (flexible SE)

4.

Density of medium under monitoring

from 600 to 1500 kg/mі

5.

Explosion-proof system marking

1ExibIIBT5 X

[Exib]IIBT X

6.

Protection level

IP68, GOST 14254

IP50, GOST 14254

7.

Climatic version

OM1.5, GOST 15150

UKhL4, GOST 15150

8.

Ambient temperature

from minus 45 to +75 °С

from +5 to +45 °С

9.

Atmospheric pressure change limits

from 84 to 106.7 kPa

from 84 to 106.7 kPa

10.

Atmosphere type

III and IV (maritime and seaside-industrial)

II (industrial)

11.

Service life

10 years, min. for DUU2M-01, -02, -02T, -03 to –08;
8 years, min. for DUU2M-10, -12, -14, -16

at least 10 years

12.

Mass

13.5 kg, max.

0.4 kg, max.

13.

Overall dimensions

145x215x(130+LSE*), mm, max.

100x75x109.5 mm, max.

 
 * LSE – sensitive element length.

4.2 Viscosity is unlimited when the medium under monitoring fails to get solidified, and there are no deposits on the primary transducer structural elements, which hinder movement of the float.

4.3 The upper immeasurable level does not exceed (0.24 + HF − HIMMER), m, where HF stands for a float height, and HIMMER. stands for a depth of the float immersion The particular value is defined by geometric sizes of the float and the value of the "Insensitivity zone from drive pulse" programming parameter to be preset in the process of adjustment.

4.4 The lower immeasurable level for the DUU4M-01, -02, 02T, -03, -04 level gauges does not exceed (0.1 + HIMMER.) m. This level does not exceed (0.15 + HIMMER.) m for the DUU4M-05 to -08 and (0.2 + HIMMER.) m for the DUU4M-10, -10T, -12, -14, -16 level gauges, where HIMMER stands for a depth of the float immersion in meters

4.5 The zone of immeasurable levels between two floats in multifloat transmitters is not more than 0.312 m.

4.6 Metrological characteristics

4.6.1 The absolute basic error of the level measurement consists of the transmitter primary transducer error and the error of conversion of units.

4.6.2 The absolute basic error in measuring the level of the transmitter level gauges does not exceed ±1 mm for the primary transducer with floats of type I and ±5 mm for the primary transducer with floats of types II, III, IV and V. See characteristics of floats in Secton II.9 of the Catalogue.

4.6.3 The value of errors of conversion of units is determined by the type of their output signal. When the level gauge output signal is essentially a digital code (the RS-485 serial interface incorporated in the DUU4M-RS) the unit does not enter an error as a result of measuring the level by the transmitter. In this case, the unit only transforms codes in the digital format corresponding to the output.

If output signals of the level gauge are essentially current outputs (the DUU4M-TV set), then superimposed on the error of the transmitter level measurement is the error of conversion of the measurement result digital value into the value of output current signals of the BTVI3 units. Limits of the admissible reduced error of the digital-analog conversion in the DUU4M-TV set shall be equal to ±0.1 %. Limits of the admissible absolute basic error in measuring the level of the DUU4M-TV sets shall be equal to value ΔHK, mm, to be determined by the formula:

∆HK = ±[(0.001LDUU2М)² + (ΔDUU2М)²]½,

where: LDUU2М − the length of the transmitter sensitive element, mm;
ΔDUU2М − the absolute basic error of the transmitter primary transducer.

4.6.4 A complementary error of the level measurement is caused by variation of the fluid density within the working temperature range. Its value is dictated by the float type, its geometric dimensions and a difference between densities of the float and product.

4.6.5 The limits of the admissible absolute basic error of the temperature measurement are as follows:
– within the temperature range from minus 45 to minus 10 °C: ±2 °C;
– within the temperature range from minus 10 to +85 °C: ±0.5 °C;
– within the temperature range from +85 to +120 °C: ±2 °C

4.6.6 Limits of the admissible reduced basic error of the pressure measurement constitute ±1.5 %.

4.7 Characteristics of output signals

4.7.1 Characteristics of current signals BTVI3:
– number of output current signals − six;
– range of the scale of current signals − from 4 to 20 mA;
– load maximum resistance − not more than 750 Ω.

4.7.2 Characteristics of BII3:
– interface type − RS-485;
– galvanic isolation of the interface output circuits from the common wire and internal circuits of BII3 (the insulation strength is 1,000 VDC for one minute);
– programmable rate of transmission is up to 19,200 bit/s;
– programmable parity monitoring;
– logic protocol − Modus RTU (programmable address).

4.8 Electrical parameters and characteristics

4.8.1 The transmitters and level gauges are supplied from an external insulated stabilized DC power supply source with a voltage of + 24 V ±10 %.

4.8.2 Current consumed by the transmitters does not exceed 180 mA.

4.8.3 The transmitter primary transducers are supplied from units with an isolated spark-proof DC voltage of +12 V. Current consumed by the transmitter is not more than 36 mA.

4.8.4 As to the level of protection against electric shock, the transmitters are referred to protection class III in compliance with the requirements set forth in GOST 12.2.007.0.

4.8.5 At an ambient temperature from +15 to +35 °C and relative humidity from 30 to 80 %, the electrical insulation withstands the following test voltages without any breakdown and surface flashover for one minute:
– 1,500 VAC, 50 Hz (effective value) between spark-proof circuits and spark-hazardous circuits;
– 500 VAC, 50 Hz (effective value) between output circuits and power supply circuits.

4.8.6 Resistance of the electrical insulation between spark-proof circuits and spark-hazardous circuits, as well as between output circuits and power supply circuits constitutes:
– at least 20 MΩ under normal conditions;
– at least 5.0 MΩ at the upper value of the working condition temperature.

4.8.7 The transmitter primary transducer properly functions provided that the coupling cable between the transmitter and the unit is not longer than 1.5 km. It is permissible to use shielded test cables possessing the following parameters: RCABLE ≤100 Ω, CCABLE ≤0.1 μF and LCABLE ≤2 mH. To enhance the transmitter immunity to industrial noise, it is good practice to use a shielded cable containing two twisted wire pairs.

4.8.8 The data exchange between the transmitter primary transducers and the units is effected by the serial code in the asynchronous half-duplex mode through the internal protocol of the "Albatros" JSC. The rate of transmission is determined by positions of switches on printed circuit boards of the transmitter and units, and constitutes 2,400 bit/s or 4,800 bit/s. The rate of exchange is established to be equal to 4,800 bit/s by default.

5 Overall Dimensions

Figures II.1.1, II.1.2, II.1.3 of Chapter II.1 show overall dimensions of the transmitters. Overall dimensions of the BTVI3 and BII3 units are given on Figures II.6.1, II.6.2, correspondingly

 

Figure II.6.1 − Overall Dimensions of Spark-Proof Current Output Unit 3 (BTVI3) 

 

 

Figure II.6.2 - Overall Dimensions of Spark-Proof Interface Unit 3(BII3)