Kofloc Model RK1812/RK1814 Flowmeters with Photosensor (for Alarm Switches)

Description

The Kofloc Model RK1812/RK1814 Flowmeters with Photosensor utilize a highly reliable optical detection system. A photosensor is clamped to the outside of the glass tube; when the float passes the sensor’s infrared beam, it triggers a switch signal (Open/Closed). Because the sensor is located outside the fluid path, there is no risk of contamination, corrosion, or mechanical interference with the float.

The series is split into two primary configurations:

RK1812: Typically features a standard valve at the bottom for general pressure applications.
RK1814: Often utilized in configurations requiring more specialized control or vacuum compatibility.

These meters are essential for “unmanned” operations. While a technician can check the flow visually at any time, the photosensor acts as a 24/7 watchdog. If the flow drops below a critical threshold (e.g., cooling water for a laser) or exceeds a limit, the signal can be used to trigger an audible alarm, light an LED, or shut down a process automatically via a PLC.

Brand

Kofloc

The natural environment is preserved through the balance of solids, liquids and gases that exist on the earth. However, human civilization has caused pollution that has greatly damaged our environment. The task of the present generation is to restore our environment to its natural healthy state. And this is also the greatest challenge for 21st century science and technology.

KOFLOC's corporate motto is "A Scientific Approach for Fluids." In other words, we create products that scientifically measure and control the balance of liquids and gases. We trust that through our work we are making a contribution to the regeneration of the environment and to the establishment of a prosperous society.

Features

Non-Contact Alarm Switching: Photosensor detects float position through the glass without touching the fluid.
Dual Monitoring: Provides both visual flow indication and electronic alarm output.
Adjustable Set-Points: The sensor can be easily moved up or down the tube to change the alarm threshold.
Enhanced Safety: Ideal for fail-safe monitoring of cooling water and carrier gases.
Low Pressure Drop: The optical sensor does not obstruct the flow path.
High Reliability: No moving electrical parts within the fluid ensures a long service life.

Specification

Models: RK1812 (Inlet Valve) / RK1814 (Outlet Valve)
Measurement Principle: Variable Area with Optical Float Detection.
Alarm Type: High-limit or Low-limit (User adjustable).
Sensor Type: Infrared Photosensor (requires DC power supply).
Output Signal: NPN/PNP Open Collector or Reed Switch (depending on spec).
Applicable Fluids: Air, Nitrogen (N2), Argon (Ar), Water, and other clear fluids.
Accuracy: Within ±5% F.S.
Max Pressure: 0.5 MPa to 0.7 MPa.
Wetted Materials: SUS316, Glass, Viton, and Brass options.

Applications

The Kofloc Model RK1812/RK1814 Flowmeters with Photosensor are the standard choice for:

Laser Cooling Systems: Triggering an emergency stop if cooling water flow fails.
Semiconductor Gas Cabinets: Alarming when purge gas levels fall below safe limits.
Chemical Dosing: Ensuring constant reagent flow in automated batching.
Vacuum Furnace Protection: Monitoring inert gas flow to prevent oxidation during cooling.
Laboratory Safety Hoods: Visual and electronic confirmation of exhaust airflow.

Additional Information

Operating power supply	24 VDC±10%
Power consumption	Light projector: 15 mA or less; Light receiver: 22 mA or less
Output mode	NPN open collector, sink current: 80 mA (30 VDC) max.
Running mode	Light on
Response time	0.5 msec or less
Cord	Light projector: 0.15 mm2 two-core cable (2 m); Light receiver: 0.15 mm2 three-core cable (2 m)
Manufacturer	Takenaka electronic industrial co., Ltd.
Type	UM-T15TV (24 VDC) photoelectric switch containing amplifier with repeater dial on the receiver side