Safety Precautions
• Assembly, commissioning and servicing may only be performed by specialist personnel!
Applicable European and national regulations for erection of electric systems must be complied with.
• Connect the device only to voltage indicated in the technical data and on the nameplate.
• In case of assembly or maintenance work, the device must be disconnected from all currents!
• Operate the device only under the conditions defined in the operating instructions!
1 - PRINCIPLE
The magnetic floats or counter-weights drive a lever arm to establish a dry contact, operating on a micro-switch. When the actuator
passes in front the switch it changes the status and stay on until the float passes again.
The level switch BSM 501 is working with all our floats and counter-weights designed for standard tube of diameter 32, 35 or 63
mm. The model BSM 515 is specifically designed for use with our by pass level indicator MAGTOP in stainless steel; not
convenient for plastic or carbon steel MAGTOP
2 - MOUNTING
- The level switch BSM 501 fits directly the guiding tube of a level indicator with a collar or in stainless steel or in plastic.
- Take care of its position on the tube to allow the easiest electrical wiring operation.
- The cable plug must always point down. The BSM 501 could be fixed all along the float operating way.
- Open the Din plug to connect the cable.
- Terminals are 3; the status NO or NC of the contact depends of
the wiring, please see the drawing and consult the notes below.
- Let the cable passes through the pressure gland.
- Remount the Din plug, screwing tightly to assure the waterproof
protection.
Notes
- To have a contact when the level is increasing, connect the
terminals 1 and 2 (Normally Open).
- To have a contact when the level is decreasing, connect the
terminals 2 and 3 (Normally Close).
- When using a SFA, cable and pulley operated level indicator, use
the reverse logic as the counterweight is going down when the
level is increasing.
- Always install the float with "TOP" sign upside.
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585 M1 01 G
03-01-2008
3 - TECHNICAL FEATURES
Rated voltage:
4 V...250 V AC, 4 V...30 V DC
Rated current:
1 mA ... 3 A (AC or DC)
Switching principle:
Magnetic actuated micro switch
with change over contact
Minimal distance:
40 mm between two switching points
Max. cable cross section: 1.5 mm
2
Connector:
3 poles cable plug acc. DIN
EN 175301 with Pg terminal
Ambient temperature:
-20°C ... +90°C
Material: Transparent
polycarbonate
Fitting:
Stainless steel or plastic collar
Housing:
IP 65 acc. EN 60 529
CE labels:
In accordance with low Voltage
Guidelines 72/73/EEC,
EMV Guidelines 89/336/EEC
2
3
1
Set magnet rocker to correct position before service
by moving the float or counter weight inside its guiding tube.
Connection:
Contact position while float is in lower position
PVC tube Ø 32 x 27
or
Glass tube Ø 35 x 29
Float
Counter weight
PVC tube Ø 63 x 57