Model FR20 & OLV-20 - Magnetic Float Level Sensor

General Description

The FR20 and OLV-20 custom level sensors are engineered and manufactured to meet demanding customer applications for liquid level sensing. Available in a wide range materials and mounting types, these sensors are appropriate in most liquids. The FR20 series is available in lengths up to 3900mm with a variety of mounting configurations. The OLV-20 series is physically smaller and has a maximum total length of 500mm. Interface of two immiscible liquids can be detected by FA series. The difference of SG is required more than 0.1 for SS float, 0.2 for plastic float.

Operational Description

These level sensors contain hermetically sealed reed switches in the stem and a permanent magnet in the float. As a float rises or falls with the level of liquid, the reed switch activates by the magnet in the float.

Applications

The FR20 and OLV-20 have numerous industrial, machinery and process control applications that include some of the following:

• Control: In processing petrochemicals, iron, steels,chemicals and food
• Original Equipment Manufacturing: As a reliable component in boilers, hydraulic equipment, air conditioners, etc
• Semiconductor Manufacturing: As a non-contaminating pump control for pure water.
• Automatic Planting Machinery: As a level control in corrosive plated environments

Selecting the Correct Series

The FR20 series offer a wide range of choices in floats, mounting configurations, materials, and number of switch points, while the OLV-20 series offer smaller dimensions, shorter maximum length and lower cost.

1. Determine whether an FR20 or OLV-20 series are required.
2. Select the required material for the stem and floats.
3. Select the required mounting type.
4. Determine the number of actuation levels required.
5. Determine where the actuating levels should be. Distances are measured from the inner surface of the mounting to the end of the stem.
6. Determine switch operation - normally opened (up ON, down OFF) or normally closed (up OFF. down ON).

Conformity and Approval

CE (Low Voltage Directive): The FR20 and OLV-20 series without housing is in conformity of EN6101 Q-1: 2nd edition (2001 ).

RoHS Directive: The FR20 and OLV-20 series with material of 304SS, 316SS, and 316LSS, but without housing, can be in conformity of RoHS Directive.

NK (Marine Approval): The FR20 and OLV-20 series are approved to suite ship building regulation by Nippon Kaiji Kyokai who is a ship classification foundation in Japan, but limited application.

Switch Rating 15VA Reed Switch

• Max Capacity: 15VA / 15W
• Max Current: 1A AC / 1A DC
• Max Voltage: AC 264V / DC 200V

Switch Rating 220VA Reed Switch

• Max Capacity: 220VA / 55W
• Max Current: 1A AC / 0.5A DC
• Max Voltage: AC 220V / DC 110V

Click on the buttons for full Nohken Specification catalog Sheet and User Manual

Catalog User Manual FR20 User Manual OLV20