model Px multiple flow tube meters

model Px multiple flow tube rotameter for low flow rate measurement

Design Features

rib-guided or fluted metering tubes facilitate stable and accurate readings
interchangeability of flowtubes and floats
manifolding at inlet or outlet (optional)
ease of installation and exchange of flow tubes
"non-rotating" adapter feature - glass flow tubes are prevented from turning during the tightening phase of the assembly procedure
OPTIGRAD™ scales minimize parallax and eye fatigue
chemical compatibility
simple means of panel mounting

The model Px multiple tube flow meter line offers, the convenience and simplicity of 2, 3, 4, 5 and 6 tube meters, retaining most of the unique design features associated with single tube units (like our model P). Multiple tube meters are available with 65mm or 150mm flow tubes. The same flow tubes as in single unit flow meters. Px meters are convenient for applications where several streams of gases or liquids are to be metered in individual channels, or manifolded.

Shipped completely assembled, flow meters include standard mounting fittings in a choice of materials, side plates, thick protective front shield and back plate, optional built-in control valve, and flow tubes selected from the Flow Capacities tables in our catalog or with our online configurator.

Panel mounting style is convertible to bench mounting through the use of the optional acrylic tripod. The tripod has a built-in spirit leveler and leveling screws.

Flow tubes for these meters are available with two types of scales, suitable for different types of applications

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DIRECT READING SCALES

Direct reading scales are indicating flow rates of liquids and gases,in engineering units such as [mL/min], standard cubic feet per hour [scfh] etc. Such scales are designed exclusively for a specific gas or liquid at a given set of pressure and temperature parameters, and are valid for the associated units of flow only. The convenience of direct reading scale designs should be weighed against the resultant limitations of applicability. Generally, direct reading scales are most suited to OEM applications.

UNIVERSAL MILLIMETER (CORRELATED) SCALES

Millimeter scales indicate the vertical position of the spherical float within the metering tube as the flow increases or decreases.

It is necessary to use flow tables or graphs supplied, to correlate float referenced readings with actual volumetric flow rates.

The advantage of Universal type scales is the ability to utilize the use of a given flow meter for a great number of different fluids at diverse pressure and temperature conditions, generally preferred in applications in laboratories, etc.

BUILT-IN VALVES

Meters may be supplied with built-in needle valves (CV™ ), high precision metering valves (MFV™) with “non-rising stems”, or with no valves.

Generally for gas metering, it is recommended that valves are positioned at inlets (bottom) for liquids valves may be positioned either at outlets (top) or inlets. For vacuum service, valves must be mounted at outlets. If unspecified at the time of ordering, meters will be shipped with valves mounted at inlets.

NOTE: The built-in-valves are always installed in the end block opposite to the manifolded one. Thus, if a meter is manifolded at the outlet, valves are installed at the inlets; if a meter is manifolded at the inlet, valves are installed at the outlets.

SPECIFICATIONS

STANDARD ACCURACY ±2% FS (mm scales - except 032/042 flow tubes); ±5% FS (direct reading scales and 032/042 flow tubes)

CALIBRATED ACCURACY ±1% FS

REPEATABILITY ±0.25% FS

USEFUL FLOW RANGE 10:1 minimum with one float and better than 20:1 with combination of two floats installed in meters

MAXIMUM OPERATING PRESSURE 200 psig (13.8 bars)

MAXIMUM OPERATING TEMPERATURE 250°F (121°C)

MATERIALS OF CONSTRUCTION

FLOW TUBES heavy walled borosilicate glass

FLOATS glass, sapphire, 316 stainless steel, carboloy and tantalum

SIDE PANELS aluminum, black anodized

FRONT SHIELD 1/8 inch thick clear polycarbonate

BACK PLATE 1/8 inch thick white acrylics

O-RING and PACKING Buna-n o-rings standard in aluminum models; Viton® o-rings standard in stainless steel models; optional Viton®, PTFE/Kalrez®, EPR

CONNECTIONS 1/8 inch NPT female inlet and outlet connections; optional 1/4 inch FNPT, hose and compression fittings are available