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Sensing and Control
Honeywell Inc.
11 West Spring Street
Freeport, Illinois 61032
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Proximity Sensors 4/6FR Series
One-Piece Ferromagnetic Actuated Reed Proximity Switches
B70 Honeywell 1MICRO SWITCH Sensing and Control 11-800-537-6945 USA 1F1-815-235-6847 International 11-800-737-3360 Canada
FEATURES
1Internal dry reed switch, ferrous metals
sensitive
1One piece construction aluminum
housing
1Single pole, single throw, normally open
circuitry
1May be used to directly drive low energy
circuits
1Long mechanical life
1Completely potted enclosure
1Hermetically sealed contacts
1No-touch detection of ferrous metals
1Standard 1/2 inch conduit outlet
1Can detect ferrous metal through
non-ferrous metal. Example: Steel
through stainless steel.
FR ORDER GUIDE
Catalog Listing
Heavy Duty Sensitivity* MUST Lead Length
Wires Cable in. (mm) Operate Pt. Feet/mm
4FR1-6 4FR2-25 0.50/12,7 0.35/8,9 6.0/1,83
6FR1-6 6FR2-6 0.75/19,1 0.60/15,2 6.0/1,83
*Nominal for low carbon steel, 1 x 3 x 0.25 in. (25,4 x 76,2 x 6,35 mm).
Note: 25 and 50 ft. (7,6 and 15,2m) lead lengths can be supplied, but longer lead lengths are not necessarily
stock items.
6FR1-6: 589,5g (20.8 oz)
CHARACTERISTICS
Circuitry Single pole, normally open
Response Time 1 millisecond
Repeatability (constant actuator 0.005 inch (0,13mm)
path, at stabilized temperature)
Power rating
AC (maximum) 15 VA, 500 mA, 280 V RMS
DC (maximum)* 15 watts, 500 mA, 400 V
Initial Contact Resistance
(closed circuit) 0.060 ohm max.
Switching Frequency Dependent on size and speed of
target. Has been tested to 100 Hz,
but should be operated at less than
700-800 Hz resonant frequency.
Reed Bounce Time 0.5 millisecond max.
Operating Life
Max. Load 100,000 operations min.
With 5FD1 relay load 50 million operations
Temperature Range –20°to +83°C (–4°to +181°F)
*DC rating with contact protection diode [N2071,
International Rect. 10D6, 600V. 1 amp or
equivalent] for increased life.
MOUNTING DIMENSIONS (For reference only)
Proximity Sensors 4/6FR Series
One-Piece Ferromagnetic Actuated Reed Proximity Switches
Honeywell 1MICRO SWITCH Sensing and Control 11-800-537-6945 USA 1F1-815-235-6847 International 11-800-737-3360 Canada B71
EFFECTS OF TEMPERATURE ON SENSITIVITY
For proper operation over the total temper-
ature range [with typical actuator (#4)], use
a minimum overtravel of 0.150 in. (3,8mm)
and minimum release travel of 0.250 in.
(6,35mm). Overtravel and release travel will
differ for smaller actuators.
MASS OR ACTUATOR SIZE VS SENSITIVITY
MAGNETIC ATTRACTION
The switch exerts a magnetic force on the
actuator. The actuator should be secured to
prevent its being drawn to the sensing face.
1. Do not subject the switch to the influence
of strong magnetic fields. External per-
manent magnets should be a minimum
of 6 inches (152mm) from the switch.
2. Ferromagnetic materials (other than the
actuator) should be at least 3 inches
(76,2mm) from the sensing face.
3. Arc suppresion networks must be used
in inductive circuits.
4. These switches should not be subjected
to severe shock.
5. Mount on solid support and protect from
vibration.
6. The switch may fail to release if adjacent
steel parts are too close, or if quantities of
metallic chips are attracted to the sens-
ing face.
7. Do not subject reed switches to high in-
rush currents.
8. Each 4/6FR contains a glass reed switch
and a magnet, and should be handled
and applied accordingly.
Proximity