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1 Purpose

The SUR-5 ultrasonic level alarm (hereinafter referred to as the "device") is designed for monitoring the level of various fluids in one point of process reservoirs, as well as for carrying out control over process units and plants installed on objects in zones of classes 1 and 2 according to GOST R 51330.9, where formation of mixtures of combustible gases and vapours with air is possible, which belong to category IIB, GOST R 51330.11, and temperature class T5 inclusive in conformity with GOST R 51330.0.

The device is 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 4.0 MPa, up to 10 MPa in case of special configuration).

Level transmitters incorporated in the device composition are made in the explosion-proof version in compliance with the requirements of 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 explosion-proof system has the 1ExibIIBT5 X marking in conformity with GOST R 51330.0.

2 Medium to Be Monitored

Oil, oil products, solvents, liquefied gases, acids, alkali and other corrosive and non-corrosive media, including heavily foamy, boiling and high-adhesive ones. Resistance to corrosive media is provided by materials being in contact with a corrosive medium, such as the 12Kh18N10T stainless steel.

3 Composition of Device

The device consists of:
– the DPU5 level transmitter;
– the PVS4 secondary transducer.
The DPU5 level transmitter is connected to the PVS4 secondary transducer through a two-wire shielded cable. Characteristics of the cable are given in Item 4.6.6 of this Section.

4 Specifications

4.1 The basic specifications and operating conditions of the level transmitter and secondary transducer are given in Table I.3.1.

Table I.3.1

№	Parameter	DPU5	PVS4
1.	Sensitive zone extension	from 0.25 to 4.0 m	–
2.	Temperature of medium under monitoring	from minus 45 to +100 °C	–
3.	Pressure of medium under monitoring	up to 4.0 Mpa (in case of special order)	–
4.	Explosion-proof system marking	1ExibIIBT5X	[Exib]IIB
5.	Protection level	IP68, GOST 14254	IP50, GOST 14254
6.	Climatic version	OM1.5, GOST 15150	UKhL4, GOST 15150
7.	Ambient temperature	from minus 45 to +75 °C	from +5 to +45 °C
8.	Atmospheric pressure change limits	from 84 to 106.7 kPa	from 84 to 106.7 kPa
9.	Atmosphere type	III and IV (maritime and seaside-industrial)	II (industrial)
10.	Service life	10 years, min.	10 years, min.
11.	Mass	3.6 kg, max.	0.4 kg, max.
12.	Overall dimensions	145x215x(130+L*), mm, max.	55x75x109.5, mm, max.

* L – extension of the sensitive zone.

4.2 The rated extension of the transmitter (Ref. Figure I.3.1, size L) is from 0.25 to 4.0 m (dictated by the length of the rod connecting a receiving-transmitting assembly to the primary transducer case and is to be preset when making an order).

4.3  Operation of the level transmitter is ensured when the level is within limits of the receiving-transmitting assembly. The manufacturing company adjusts the operating level within ±10 mm far from center line D (Ref. Figure I.3.1).

4.4  The device actuation time constitutes not longer than 5 s.

4.5  Limits of the admissible absolute basic error of defining the level position constitute ±10 mm.

4.6  Electrical parameters and characteristics

4.6.1  The device is supplied from an external power source with a voltage of 24 V ±10 %.

4.6.2  Current consumed by the device fails to exceed 30 mA.

4.6.3  As to the degree of protection against electric shock, the device is referred to protection class I in compliance with the requirements set forth in GOST 12.2.007.0.

4.6.4  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:
– at least ~1,500 V, 50 Hz (effective value) between spark-proof circuits and spark-hazardous circuits;
– at least ~250 V, 50 Hz (effective value) between output circuits and power supply circuits.

4.6.5  Under normal application conditions, the electrical insulation between spark-proof circuits and spark-hazardous circuits constitutes at least 20 megohms.
Under normal application conditions, the electrical insulation between output circuits and power supply circuits constitutes at least 20 megohms.

4.6.6  The device properly functions provided that the coupling cable between the level transmitter and the PVS4 secondary transducer is not longer than 1.5 km. It is permissible to use shielded coupling cables possessing the following parameters: R_CABLE ≤200 ohms, C_CABLE ≤0.1 μF and L_CABLE ≤2 mH. To enhance the transmitter immunity to industrial noise, it is good practice to use a shielded cable containing two twisted wire pairs.

4.6.7  The time of establishing the operating condition is not longer than 15 s.

4.6.8  The device is designed for continuous operation.

4.6.9  There are the following limit parameters of the device keys under an active load:
– DC or AC switched voltage is not higher than 250 V;
– permissible current to change over a key does not exceed 1.0 A;
– resistance of a key in the closed state is not more than 1.2 Ω.
A consumer sets up initial states of the keys.

10  Overall Dimensions

Overall dimensions of the DPU5 level transmitter and the PVS4 secondary transducer are given in Figures I.3.1, I.3.2, correspondingly.

Figure I.3.1 − Overall Dimensions of DPU5 Level Transmitter

Figure I.3.2 − Overall Dimensions of PVS4 Secondary Transducer