SKVA-01-1.E Single-Channel System

SKVA-01-1.E Single-Channel System

The SKVA-01-1.E System is a stationary type, single-channel continuous gas detector designed to measure the concentration of the measured substance in the working area air in real time, display current values, signal about exceeding two pre-set thresholds, as well to control secondary devices: executive elements of ventilation systems, sound alarm, and light alarm.

Pdf иконкаSKVA-01-1.E Type Approval Certificate

Pdf иконкаSKVA-01-1.E Certificate of Conformity

Pdf иконкаType Approval Certificate Description

jpeg.jpg Cable Connection

  • Description
  • Specifications

The system consists of two units: a transducer and the Power Alarm Unit (PAU). The transducer generates an analogue signal proportional to the concentration of the measured component (linear or stepwise depending on the transducer type) and transmits it to the PAU via a communication line. The PAU processes the signal from the transducer and converts it into digital indicators of the concentration displayed on the screen.

Fig. 4.jpg

Depending on the measured concentration, the PAU includes a built-in light alarm (a green ‘NORMA’, red ‘THRESHOLD’ LEDs), a buzzer, and control relays according to the pre-set algorithm. The control circuits of the secondary devices are connected to the control relays terminals.

The initial state of the relay (ON or OFF) is determined by jumpers on the board. The PAU is of two versions: an explosion-proof one (E) and general industrial one (O). In the explosion-proof design, the power supply of the transducer is carried out through an intrinsically safe circuit. The PAU has an RS-485 output. The output is designed to transfer data to the upper-level systems. The PAU is assembled based on a single-chip micro-controller. It is designed to operate with transducers manufactured for the SKVA-01, SKVA-01M Gas Detecting Systems. The thresholds and the appearance of the front panel are determined by the transducer type, which is connected to the PAU, and these are shown in the Table. The thresholds are unregulated.

For Projects for the SKVA-01-1.E Systems, see the Typical Solutions

The SKVA-01-1.E operates using a 180VAC to 240VAC, 50±1 Hz mains.

Nominal values of U4 climatic factors according to GOST 15150-69:

Operating conditions:

Alarm and control unit:

Ambient temperature-40 to +40°С
Relative humidityup to 80%
Atmospheric pressure74.8 to 106.7 kPa

Of the transducer:

Ambient temperature–40 to +45°C
Relative humidityup to 95%
Atmospheric pressure74.8 to 106.7 kPa

The supply voltage of the transducers is 24 V.

The output signal is the RS-485, LED alarm, audio alarm, and the enable/disable option of voltage free output relay contacts.

The input resistance of the secondary recording device is NMT 600 Ω.

The factory setting of the “POROG1” and “POROG2” alarm thresholds is presented in the Data Sheet. It corresponds to the values indicated in Table 2.

The alarm response time is NMT 1 second after the setting procedure of the threshold concentration value at the output of the transducer.

The average service lifetime is NLT 10 years.

MTBF: 100,000 hours.

Index of Protection of the housing: For the PAU: IP54; For the transducer: IP54, 65, 67.

Relay load characteristics: 220 V, 1 A.

Overall dimensions, mm, NMT: PAU: 110x170x55; Transducer: the data are indicated in the Data Sheet.

Weight, kg, NMT: PAU: 1.4; Transducer: the data are indicated in the Data Sheet.

Maximum cable length:

  • Shielded electric cable connecting the transducer to the PAU: 1,000 m.

Insulation resistance between the housing and the power supply circuits of the PAU: NLT 20 MΩ under normal conditions.

The insulation between the PAU housing and the network cable must withstand a 1,400 V test voltage for 1 minute.

List of Controlled Substances

Gas Range Threshold 1 Threshold 2 Formula
Hydrogen sulphide 0 to 20 mg/m3 10 19.4 H2S
Hydrogen sulphide 0 to 20 mg/m3 3 10 H2S
Hydrogen sulphide 0 to 50 mg/m3 10 30 H2S
Hydrogen sulphide 0 to 100 mg/m3 10 60 H2S
Ammonia 0 to 100 mg/m3 20 60 NH3
Ammonia 0 to 2000 mg/m3 500 1500 NH3
Ammonia 0 to 600 mg/m3 60 500 NH3
Chlorine 0 to 6 mg/m3 1 5 CL2
Chlorine 0 to 5 mg/m3 1 4,8 CL2
Chlorine 0 to 50 mg/m3 5 20 CL2
Chlorine 0 to 30 mg/m3 1 20 CL2
Hydrogen chloride 0 to 10 mg/m3 5 9,7 HCL
Hydrogen chloride 0 to 30 mg/m3 5 15 HCL
Hydrogen chloride 0 to 30 mg/m3 5 25 HCL
Carbon monoxide 0 to 100 mg/m3 20 95 CO
Carbon monoxide 0 to 500 mg/m3 20 300 CO
Carbon monoxide 0 to 1000 mg/m3 100 950 CO
Nitrogen dioxide 0 to 15 mg/m3 2 10 NO2
Nitrogen dioxide 0 to 30 mg/m3 2 20 NO2
Nitrogen dioxide 0 to 50 mg/m3 6 40 NO2
Sulphur dioxide 0 to 30 mg/m3 10 29 SO2
Sulphur dioxide 0 to 35 mg/m3 10 30 SO2
Sulphur dioxide 0 to 100 mg/m3 10 50 SO2
Hydrocyanic acid 0 to 15 mg/m3 3 10 HCN
Hydrocyanic acid 0 to 40 mg/m3 3 30 HCN
Hydrocyanic acid 0 to 3 mg/m3 0,3 1,5 HCN
Oxygen 0 to 30% (by volume) 18 23 O2
Oxygen 0 to 25% (by volume) 18 23 O2
Hydrogen 0 to 2% (by volume) 0,2 0,8 H2
Hydrogen 0 to 2% (by volume) 0,4 0,8 H2
Flammable gases and vapours 0 to 50% LFL 20 40 CnHm
Flammable gases and vapours 0 to 50% LFL 20 48 CnHm
Flammable gases and vapours 0 to 50% LFL 10 40 CnHm
Flammable gases and vapours 0 to 50% LFL 10 20 CnHm
Flammable gases and vapours 0 to 100% LFL 20 50 CnHm
Flammable gases and vapours 0 to 100% LFL 50 95 CnHm