Instrument cables are used in data processing and process control systems and can be installed outdoors or buried in the ground.. For digital systems and for communication between solenoids (Solenoid valves) Type with its overall slide (Overall screen) And for analog systems of even and general shielded type (Individual & Overall screen) Is used.
- The overall shield of the cable is able to protect it from external noise.
- Kabul pair shield weakens the harmony between the pair strings.
- Its armed type can withstand external mechanical forces.
- The lead type is stable in environments containing hydrocarbons, solvents and corrosives..
Types of instrumentation cables in terms of application
- Cables used in the building: In the internal construction of these cables, copper conductor and V.C insulation and sheath are often used.
- Ground cables:For cabling inside the soil, a cable with copper conductor and insulation and E.T sheath is often used. If necessary, the above cable is reinforced with wire with steel tape..
- Overhead cables:Aerial cables with steel restraint wires in places where it is necessary to hang the cable on power poles. Aerial cables in the form of (۸) Used. In these cables, a galvanized steel wire is placed parallel to the cable and a sheath of polyethylene material is pulled on them.. (The above cable is installed by special clamps to the beams).
Types of instrument cables and its application in terms of internal construction
- Protodor cable:This type of cable is used in transmission and distribution of electricity to factories and networks up to one kilovolt..
- Paper insulated cable :It is used in buildings and networks and..
- Plastic insulated cable : It is used in tensions and is no longer produced and used.
- Cable with lead sheath (Paper cable with lead sheath) : It is used in gas stations and oil storage areas and refineries.
- Cable with aluminum cover : It is used to transfer energy to the earth.
- Offshore cable : As the name implies, this cable, which is a kind of protodor, is often used to transmit electricity up to 10 kV from rivers and seas..
Types of instrument cables
- Shielded instrumentation cables
- Foil instrumentation cables
- Analog instrumentation cables
Definition of instrument cable
Family Control cables and instrumentation One of the largest, most original, most widely used and most important cables in the electricity industry is electronics. Due to its multiplicity in structure, this cable has various capabilities such as resistance to noise from endogenous and exogenous waves and resistance to interference and impact from adjacent cables or sources of electromagnetic waves. We will examine the type of cables more.
Control cables and instrumentation are very different from power cables, because power cables carry high currents at high voltage levels, but Instrument cable Or control low current carriers or signals at low voltage levels.
Of course, power cables also have a difference in appearance with instrumentation and control cables, which are as follows:
- Power cables have few strands, but instrumentation and control cables have more strands.
- Power cords are usually larger than 4mm ،, while control cable and instrumentation are smaller than 4mm..
- The number of strings of control cables is more than instrumentation cables.
A huge difference between instrument and control cables:
Instrument cables are usually twisted in pairs, triples, triples, or quadruples, and have EMI control layers..
- Two interconnected cables are called TWISTED PAIR.
- Intertwined three-stranded cables are called TRIPLE.
- Intertwined four-stranded cables are also called QUAD.
