A flow relay is a flow switch used to detect fluid flow within a pipeline.

It detects and sends a signal when the flow rate of liquid flowing through a pipeline increases or decreases beyond a set value. It is used to detect the flow rates of various liquids, not only water, but also seawater, fuel, oil, and others.

<Examples of Use> ・Management of shaft cooling in power equipment (pumps, electric motors, generators, etc.). The relay sends a signal when the cooling water for the power equipment falls below a certain flow rate, preventing potential equipment failure. (Main places of use) Pump stations, water and sewage departments, hydroelectric power stations, thermal power stations, reducers, etc.

・Management of liquid transportation. When a certain flow rate of cooling water flows into the pipeline leading to a stopped power device, a signal is sent to start the power device. (Main places of use) Fuel delivery lines at airports, fuel delivery lines at combined facilities, etc.

Please contact us with the manufacturing number (MFG No.) and the date of manufacture, which are stamped on the upper part of the model's nameplate. We will provide a quote accordingly.

If you are replacing from another company's model, please inform us about:
・Connection diameter (A)
・Fluid and liquid temperature
・Flow direction (horizontal, upward, downward)
・Flow rate values (maximum, usual, operating flow rate (reduced or increased flow rate))
・Material
・Other special notes.

We have prepared an Inquiry Checksheet that neatly summarizes the above. Please use it.

Please inform us of the manufacturing number (MFG No.) and the manufacturing date. We will provide the procedure for models that can be overhauled by the customer. Also, we can perform overhaul and flow rate calibration work at our company, so please inquire.

The accuracy of the flow relay is as follows:

If liquid remains in the pipeline during storage, there is a risk that the sight glass or body could be damaged by freezing in winter. In addition, please be aware that scale or rust that develops inside the pipeline may block the nozzle when operation begins.

Yes, it is possible. Please inform us at the time of order or inquiry. Please note that in the case of special painting, it may take longer to deliver.

Our flow relay operates on the proximity relationship between the 'magnet' and 'reed switch'. This relationship is delicate and can cause the device to not operate correctly if the balance of either one is disturbed. We request that you replace the entire internal mechanism.

Due to the differences in body material, size, paint specifications, etc. depending on the liquid quality (water, seawater, oil, etc.), flow rate, and other conditions, the price can vary greatly. We provide quotations each time, so please contact us.

It can be replaced. Those made until 1996 were manufactured by Nikkiso Industries, and those made after 1997 were made by Aromanicki. We also have back data for Nikkiso Industries' flow relays, so we can manufacture with the same specifications. We manage by the manufacturing number (MFG No.), so please inform us at the time of your inquiry.

The standard material for the cover is Noryl, but it can be manufactured with other materials according to your specifications. (Examples: C3604Cr plating, made of SUS304, etc.)

Choose the flow rate value to be set from the data on the test result sheet, and read the scale position (adjustment range value) corresponding to it. When you turn the adjustment screw with a flat-blade screwdriver, the scale plate rotates in conjunction with the adjustment screw. Align the scale of the scale plate with the corresponding scale position.

If you do not have a test result sheet, please refer to the operation characteristic graph attached to the back of the flow relay upper terminal cover.

When disassembling and cleaning the sight glass, please follow the steps below.

※Caution
Always drain the fluid from the piping. Also, if the fluid is at a high temperature, please make sure the flow relay has cooled down to avoid burns. If the fluid-contacting part has been coated with epoxy or something similar, forcing it apart can damage the coating surface. If you are unsure about the specifications, please contact us with the manufacturing number (MFG No.) beforehand.

Things to prepare
Phillips Screwdriver (for M5)
Wrench Plastic Hammer

Loosen the six screws that hold the window frame with a Phillips screwdriver and remove the window frame. Hold the window frame by hand to prevent it from falling. Also, there is a gasket between the window frame and the sight glass, so remove it as well.

The sight glass can be difficult to remove if it has been adhered to the gasket after long-term use.
If this is the case, it may be easier to remove using the following method.
1. Check the gap between the sight glass and the body. (Visually)

2. Lightly tap the sight glass on the opposite side of the confirmed gap with a plastic hammer (or shock hammer).
Or, tap evenly around the sight glass to remove it.
Be very careful not to break or drop the sight glass.
There is also a gasket between the sight glass and the body, so remove it as well.

Components of the sight glass part (From the left)
・Sight glass gasket (body side)
・Sight glass (tempered glass)
・Sight glass gasket (window frame side)
・Mounting screws (6 pieces)
・Sight glass frame
The disassembly of the sight glass part is now complete. Check the cleanliness of the sight glass and the deterioration of the gasket (cuts, twists, hardening, etc.), and replace if necessary.

The following are the steps to install the sight glass part.
Clean the gasket surface with a wrench, and then attach to the body in the order shown in the photo above.
Tighten the mounting screws a little at a time evenly with a Phillips screwdriver (for M5) until the screws can no longer turn. (Repeat diagonally in the order ① to ⑥.)
If possible, use a torque driver and tighten to a torque of 2.94N・m (30kg-cm).

Sight glass part installation complete
Please check that no parts have been forgotten in the installation.