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Float-Type Level Switches

Riko’s float-type level switch flexibly accommodates
the movement of specific liquids.

Features of the level switch

  1. The simple mechanism is relatively trouble-free.
  2. The compact design requires little space.
  3. The highly reliable reed switch contacts have a high repeated
    accuracy and long service life.
  4. No adjustment after installation is required,
    and little maintenance is needed.
  5. The float-type configuration accommodates non-conductive liquids.
  6. The stable design exhibits little irregularity of movement.
  7. It is lower-priced than other types.

Appearance and structure

As outlined in the figure below, as the float falls, it has the status of “switched ON.” Likewise, as the float rises, it has the status of “switched OFF.”

Model nomenclature

Base material of product
(such as stem and float) is plastic.

Base material of product
(such as stem and float) is stainless steel.

Examples of model names

MFS17-A MFS (base material: plastic), 17 (model, development no.), A (float number).
The MFS series includes a float number because in many cases only the float material differs from that of the stem of the same model. In some cases, different materials can have the same shape.
RFS-2 RFS (base material: stainless steel), 2 (model, development no.)
With the RFS series, a model without a stainless steel float is indicated as RFS-2; a model provided with a “B float” is indicated as RFS-2B.
PVC-2C Essentially the same as the RFS Series but designed with PVC (polyvinyl chloride) as the base material.

Essentially the same as the RFS Series but with some titanium parts (those in contact with liquid, including the main body, float, and stopper). The “T” indicates titanium.

HFS-2 The HFS Series is unique in indicating “H” for hysteresis.

“Hysteresis” refers to models with a level switch requiring a large measurement difference to cause
switching between the ON and OFF states (large distance required to switch “ON → OFF” or “OFF → ON”).
RFS-12H The meaning of the “H” suffix in models RFS-11H and RFS-12H is not the same as the “H” prefix in HFS-2, which indicates a heat-shock-resistant type.
Previously, a “-1” or “-2” suffix was appended to model numbers, such as “MFS17-A-1.”
The suffix “-1” indicated a model with a maximum switching voltage of 100 V; “-2”
indicated a model with a maximum switching voltage of 200 V.
In 2007, maximum switching voltage was unified at 200 V for all such standard models,
eliminating the need for the “-1” and “-2” suffixes.