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Level Switches (intrinsically safe)
Back to OverviewBS 70*/71*
Product Description and Application
- They act as level monitors and also as dry running or overflow indicators and they are used, in conjunction with a coupling switch, for controlling pump motors or solenoid valves in intrinsically safe circuits
- Applicable in water, sewage, mildly corrosive liquids, oil (without aromatic additives) and fuel oil
- Applicable as contact makers and signal transmitters (FULL/EMPTY)
- Installation position: suspended on cable
- Switching function: switching over when passing through the horizontal
- Tubular plastic enclosure, completely sealed
- Type BS 70 floats on the surface of the medium
- Type BS 71 in standard form preset to sink to a depth of 1.5 metres, variable immersion depth
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Type of explosion protection: mining
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 I M2 Ex d I |
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Type of explosion protection: industry
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II 2G Ex ia IIC T6 |
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Degree of enclosure protection
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IP 68
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EC type examination certificate
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IBExU 99 ATEX 1093
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Model and Performance Variants
| Typ | Kontaktgebung | |
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BS 70
BS 71
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With optical
signal (LED)
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By 2 series-connected LED
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BS 70/o
BS 71/o
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Supply voltage
230 Volt
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With an electronic switch (mercury tube switch),
being designed as changeover switch
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BS 70/os
BS 71o/s
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Supply voltage
230 Volt
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By a changeover switch (mercury tube switch),
connected in series with 2 anti-parallel diodes
|
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BS 71/2-3
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With optical
signal (LED)
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By 2 parallel working NO-switches,
connected in series with one LED each
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BS 71/2-4
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With optical
signal (LED)
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By 2 parallel working CO-switches,
connected in series with anti-parallel diodes
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BS 70 MS
BS 71 MS
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With optical
signal (LED)
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By a changeover switch (snap-action contact switch),
connected in series with 2 LED
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BS 70 NS
BS 71NS
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With optical
signal (LED)
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With 2 separate inclination switches, consisting of one
NC- and one NO-contact, connected in series
with one LED each |
Design – Technical Specifications
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Installation position
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Suspended on cable |
| Switching function | Switching over when passing through the horizontal |
| Floating body material | Polypropylene, flame-resistant |
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Floating body dimensions
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BS 70* = 163.5 x 32 mm
BS 71* = 163.5 x 55 mm
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| Immersion depth |
BS 70* - floats on the surface |
| Cable | Oil resistant and ultraflexible 3 x 0.75 mm² blue, optionally HO5VV-F 3 x 1 mm², blue |
| Length of connecting lead | As required, up to 75 m max. |
| Temperature stability | Max. + 60° C (higher temperatures on request) |
| Pressure resistance | Max. 6 bar |
| Contact | Depends on selected item, specific information see catalogue data sheet (pdf) |
| Switching angle | Depends on selected item, specific information see catalogue data sheet (pdf) |
| Voltage | Depends on selected item, specific information see catalogue data sheet (pdf) |
| Amperage | Depends on selected item, specific information see catalogue data sheet (pdf) |
| Electrical connection | To intrinsically safe circuits Ex i, e. g. via coupling switch |
Subject to technical modifications!
Downloads
| Download "Mining" | Download "Industry" |
| Product data sheet Level Switches (pdf) | Product data sheet Level Switches (pdf) |
| Operating instructions Level Switches (pdf) | |
| ATEX certificate Level Switches(pdf German) | |
