Micro Flowmeter DEA Engineering Company

fluid meter for low flow rates
Nutating Micro Flowmeter

Phone:(951) 5520102 | Fax:(951) 7631263 | E-mail: dealigio@deaengineering.com


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Micro Flowmeter - Recommended Installation
FIGURE 2: Recommended Installation

In typical applications, the Microflowmeter should be mounted vertically as shown in Figure 2. Non vertical orientation will subject the meter to errors at low flow rates as a result of gravitational effects. The inlet and outlet of the Microflowmeter are indicated by "IN" and "OUT" stamped on the bottom of the meter. This orientation must be observed or the nutator will be damaged. If the meter is installed where back flow conditions or down stream pulsations may occur it should be protected by a check valve in the outlet line. If the meter is installed in applications where the discharge pressure [fluid pressure at the meter outlet] is less than 100 psig then a "back pressure" check valve with a minimum of 10 psi cracking pressure should be installed to prevent cavitation within the meter.

Compression fittings and isolation and bypass valves are strongly recommended as they permit easy servicing and aid in the startup of the meter. The bleed valve shown is required in applications where it is difficult to remove trapped air from the piping. If considerable entrained air exists in the liquid, a bubble or vapor trap, should be installed upstream of the meter. The Microflowmeter will not give accurate readings if air or gas bubbles are present in the liquid stream. A 25 micron filter, upstream of the meter, is strongly recommended to prevent debris from clogging the meter. [Even a liquid which "looks" clean can contain small particulate matter which can build up on the Microflowmeter parts over time.]

When connecting the piping for the meter special care should be exercised in the use of thread sealing compounds and teflon tape. These compounds will clog the meter if allowed to enter the liquid stream. A small inlet screen is provided to protect the Microflowmeter from larger debris. However, the screen will not provide full protection from smaller items and from high viscosity compounds which can work through the screen and clog the meter. Once clogged the meter cannot be flushed effectively. Attempting to do so may damage the nutator. The meter must be disassembled and cleaned.

Once installed and ready to operate, open the bypass and bleed valves before slowly starting fluid flow to the Microflowmeter. Allow the bleed valve to remain open for a reasonable time until air and vapors have been eliminated. Close the bypass valve gradually and then the bleed valve. Begin normal operation