The stainless steel King Instrument 7430 / 7440 series rotameter utilizes a float and tapered tube design. As a result, the King Instrument 7430 / 7440 series rotameters have longer and more linear scales, better pointer stability, and 40% greater accuracy than competitively priced products.
Both the 65mm and 150mm scaled models of the King Instrument 7430 / 7440 series rotameters feature borosilicate glass tubes and all stainless steel frames. They are available in either horizontal or vertical connections. Accuracy of the King Instrument 7430 / 7440 series rotameter is determined by the scale of the rotameter – the 65mm scale has an accuracy of ±6% of full scale flow and the 150mm scale has accuracy of ±4% of full scale flow.
The maximum temperature rating of the King Instrument 7430 / 7440 series rotameter is 250°F (121°C) when used in gas applications and 200°F (93°C) when used for liquids. The maximum pressure for 316L SS fittings is 200 psig, 130 psig for PVC fittings, and 150 psig for PVDF fittings.
This product can be used in the following applications:
The Background: Our customer is an OEM that seeks a way to monitor and control the flow of ozone for a water treatment system they produce
The Problem: Ozone is commonly used as a disinfectant in water treatment systems as very small amounts of it are very effective at killing bacteria and viruses. It is generally used in such small amounts that metering it is difficult.
The Solution: We recommended a King Instrument 7430 series rotameter. The 7340 features extremely small glass tubes, made on-site by King Instruments, which are ideally suited for low flow applications of both liquid and gas. The scales can be customized to compensate for all gases and process conditions (pressure and temp). The 7430 is also available with a needle valve to finely adjust the ozone flow if needed. The typical meter wetted materials of 316SS and borosilicate glass make the meter suitable for use with corrosive ozone gas.
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