KOFLOC A Scientific Approach for Fluids

When a float that moves up and down is put in a tapered tube that is precision-formed into a tri-flat and rib-guide and fluid is introduced from below, the fluid is throttled by the float, causing a pressure dif-ference before and after.Upon receiving an upward force due to this pressure difference, the float risesand stops at a position where it balances the effective weight of the movable section.

Since the relationship between the rising height, namely, the flow area, and the flow is constant, the po-sition is detected to measure the flow.

•Install the meter as vertical as possible in a dry place.
•Select pipes with appropriate material and diameter according to the fl uid, flow, and pressure.
•Thoroughly clean the inside of the pipe.
•Turn the mounted needle valve clockwise to decrease the fl ow, and turn it counterclockwise to increase the flow. (Refer to the precision needle valve Model 2412.)
•When stopping the flow with a needle valve, take great care that the axis does not turn beyond the flow stop position. (Refer to the preci-sion needle valve Model 2412.) Install a needle valve separately to keep it protected.
•The scale on the flow meter is marked according to the actual mea-surement.
•Refer to the fi gure below for reading the fl oat. (Refer to JIS Z8761.)

•In order to prevent rupture of the tapered tube during fl ow measure-ment, do not let the pressure exceed 70% of the proof pressure. The temperature should not exceed 60°C to prevent breakage of the tapered tube and other parts. Use of toxic gas, toxic liquid, or any fluid other than those shown on the tapered tube or use at a tem-perature or pressure exceeding the highest limit could cause human injury. Never use the fl ow meter in such a manner.

•The clearance between the tapered tube and float is very small in our flow meters to enable very small flows to be measured. If dust or water enters the clearance, it will become clogged or unstable. Use clean and dry gas so that dust will not enter.

•Our original filter is installed within the very small flow range on the end face of the tapered tube. If an abnormality is found in the ta-pered tube, clean it with a neutral detergent. If the abnormality per-sists, contact us for recleaning.

•Should the needle valve cause trouble, return it as is to our company. We will investigate the cause and make adjustments.

•Install the flow meter perpendicularly. Contact us in advance if the flow meter is to be installed at an angle.

•Apply only the minimum force necessary to tighten nuts and screws.

•Secure the flow meter joint (arrow section) with a spanner when mounting it on a panel or removing the pipe joint in order to prevent the joint from becoming loose. After mounting, be sure to conduct a leak test using soapy water.

•If the pressure or flow changes suddenly, the fl oat will jump up, pos-sibly breaking the glass. When the fl ow meter is installed in series with a solenoid valve as shown in the fi gure, a fairly large quantity of gas will flow suddenly. Install a regulator or the like in between to iso-late the fl ow meter from direct pressure change.

•N2 conversion or air conversion is used for calibration. In principle, however, the accuracy will not be guaranteed unless the actual gas is used. When accuracy is particularly important, it is recommended to use the actual gas.

For calibration with any gas other than our standard gases, a separate gas cylinder is necessary. Provide us with the actual gas or we will prepare the gas by ourselves (an extra charge and actual gas calibration charge will be required). However, if dangerous gases are to be used or the flow rate is too large, we may not be able to assist, in order to protect our products and facili-ties. Contact our sales representative in advance.

•Use the accompanying nuts as shown in the figure when installing the flow meter on a panel. Refer to the dimensional drawing for the panel process-ing method.

If you find any unclear point concerning the mounting, con-tact our factory.

•If the flow meter is to be em-bedded in a panel, use the screw hole at the front of the body shown in the fi gure. Remove the label from the RK1450 and RK1250 to reveal the screw hole.

If you find any unclear point concerning the mounting, con-tact our factory.

•Connect a piping joint to the gas inlet and outlet so that no load will be applied to the flow meter.