Pressure switches are used to control pressure equipment with tanks, keeping medium pressure of an agent within fixed, defined limits. The LCA pressure switch is used for the automatic switching on and off of electric motors (pumps) working in hydrophore systems and compressed air systems, in places free from dust, gases and explosive or chemically active vapours. Manufactured in three type-sizes depending on pressure range (0.4 MPa - 0.8 MPa - 1.1 MPa). LCA pressure switches are manufactured as mechanized three-line or single-line dual-break manoeuvre low-voltage ac switches. An LCA pressure switch is a variety of a normally closed contactor. Its base, body, movable and stationary jaws are made of glass fibre-reinforced plastic. Copper contacts have silver-cadmium oxide tips. The connector casing is made of polycarbonate.
(connector sold separately)
The connector G ¼ "or G ½" to switch with aluminum socket
(connector sold separately)
Advantages of the LCA:
- pressure converting system, toggles and electrical elements remain unchanged in the new version and guarantee reliability and durability proved throughout the decades that the LCA switch has been on the market,
- membranes used in the pressure switches manufactured by Hydro-Vacuum S.A. are resistant to contact with oil pollution in pressure control systems, which allows the application of LCA switches in industry,
- LCA switch is characterised by its stability and setting repeatability thanks to the use of high quality elements,
- transparent cap manufactured from fail-safe plastic – polycarbonate, enables control of technical condition of the elements as well as position of the switch contacts,
- addition of a rotating, hydraulic connection, that will allow the assembly and disassembly of the switch in tight areas, as well as change of the switch location in the installations without switching them off,
- two dimensions of the assembly spouts G1/4 and G1/2 which allows for assembly in the majority of pressure installations,
- production and control process is carried out by qualified staff and complies with quality management system ISO:9001. Each switch undergoes hydraulic and electric trial – with test voltage of 2.5 kV
- 24 month guarantee
- all components as well as the LCA switch are assembled in Hydro-Vacuum S.A. mostly from elements manufactured by Hydro-Vacuum S.A.; remaining materials (screws, nuts etc.), are manufactured locally
Working conditions:
- Switches should be installed in closed compartments free from dust, gases and explosive or chemically active vapours
- Permissible operating altitude should not exceed 2 000 m a.s.l. Maximum ambient temperature is from -5oC to 40oC.
- The lowest relative humidity can be up to 50% at 40oC and 90% at 20oC.
- Protection degree IP 43 (under the condition of assembling the switch cap upwards)
TECHNICAL DATA
| Rated voltage of insulation | 230 V | 400 V |
| Rated continuous current | 16 A | 10 A |
| Rated frequency | 50 Hz | |
| Work category | AC-3 | |
| Rated test voltage of insulation | 2,5 kV | |
| Mechanical durability | 0,25 * 106 cycles | |
| Rated frequency of operation | 120 cycles/h | |
| Power of the direct control engines | 2,2 kW | 4,0 kW |
| Minimum temperature of driving factor | 0oC | |
| Maximum temperature of driving factor | 40oC | |
| Type of driving factor | water, air, machine oil, transformer oil |
|
| Sections of connecting cables | min 1,5 mm2 | max 4,0 mm2 |
| Pressure switches mass - with G1/4” | 0,41kg | |
| Pressure switches mass - with G1/2” | 0,50kg | |
Pressure range
Pressure settings of LCA switches
Switch section
Setting of the required pressures and switching on and off of the switch is carried out by regulating the switch-off regulation nut and switch-on screw (diagram above). Factory settings are shown in the table below. In order to change the settings, the switch has to be connected to the installation and the cover disassembled. The first step during regulation is setting the switch-off pressure with the regulating nut. By turning the regulating nut right we increase the switch-off pressure and by turning it left – we decrease it. The next step is setting the switch-on pressure with the switch-on screw. Before this operation it is absolutely necessary to loosen the regulating nut. By turning the screw (to the right) to its limit we get the maximum switch-on pressure. By unscrewing it (turning to the left) we get a lower switch-on pressure. After the regulation is completed it is necessary to screw on the regulation nut and assemble the switch cover.
Assembly:
The pressure switch is assembled to the pipeline by mounting it to the connector with a G1/2” thread. The assembly has to be sealed with a rubber washer. Before screwing down the switch, the connector has to be thoroughly deburred. No sharp edges on the connector are allowed as they may damage the rubber washer. CAUTION! It is not acceptable to screw down the switch by the cover. The switch has to be placed in the required position and screwed down by the nut with a 27 mm wrench. All work to be carried out after switching off the power.ELECTRICAL INSTALLATION:
The switch can be connected to the power line according to the electrical diagram by persons with proper qualifications and authority. Connection cables must be selected according to the applicable regulations. The switch must be secured against short-circuits. Warning signs are visible and permanently marked on the switch body. It is necessary to connect the guard wire to the guard clamp! Electric wire must be rigidly attached to the installation, so that it does not exert pressure on the switch clamps.Maintenance:
It is necessary to make periodic inspections of the switch. Frequency of the inspections depends on the switch working conditions. CAUTION: Before the inspection turn of the power line! During the inspection, the switch must be cleaned thoroughly from dust. The axis of the moving jaw, the axis of the switching lever and switching spring ends (placed in the holes of the moving jaw) should be oiled with a few drops of machine oil. All worn-out elements (connectors, springs etc.) must be replaced and the fastness of screw connections must be checked and corrected if necessaryStoring and transport:
Switches are packed individually in cardboard boxes. They should be stored in closed areas (temperature +5oC ÷ 35oC relative humidity up to 70%), free from chemically active vapours and gases. Switches should be transported in closed means of transport.Switch sizes
LPA
LPA switches are used for control of pressure equipment with open reservoir, maintaining medium pressure within fixed, defined limits. Manufactured in two type/sizes depending upon switch handle position relative to contacts. LPA switches are manufactured as mechanized three-line dual-break manoeuvre low-voltage ac switches. LPA float switch is a mechanical variety without return force. LPA pressure switch is a variety of a normally closed contactor. Its base, body, movable and stationary jaws are made of glass fibre-reinforced plastic. Copper contacts have silver-cadmium oxide tips. Switch casing is made of polycarbonate.
TECHNICAL DATA
| Rated voltage of insulation | 380 V |
| Rated frequency | 50 Hz i 60 Hz |
| Rated continuous current | 16 A |
| Rated test voltage of insulation | 2,5 kV |
| Rated frequency of operation | 360 cycles/h |
| Mechanical durability | 106 cycles |
| Minimum temperature of driving factor | 0oC |
| Maximum temperature of driving factor | 40oC |
| Type of driving factor | water |
| Maximum velocity of factor level variation in tank | 10 mm/s |
| Minimum velocity of factor level variation in tank | 5 mm/s |
| Pressure switches mass | 3kg |
| Sections of connecting cables | min 1,5 m2 |
| max 4 mm2 |
NOTE! - In case the switch is used in other temperatures and with other driving factor, the above specifications should always be agreed with the manufacturer.
Working conditions:
- Switches should be installed in closed compartments free from dust, gases and explosive or chemically active vapours.
- Permissible operating altitude should not exceed 2 000 m a.s.l. Maximum ambient temperature is 40oC, maximum daily average 35oC, the lowest temperature is -40oC.
- The lowest relative humidity can be 50% at 40oC and 90% at 20oC.
- Switch operating position should be cap upwards. Deflection from the vertical should not exceed 5o.
- Protection degree IP 430.
Switch section
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