model P single flow tube meters
Designed for low flowrates, the model P flowmeter is a precision instrument embodying the inherent simplicity, versatility and economy of the classical
variable area meter. It is particularly suitable for metering carrier gases in chromatography, indicating and controlling gases in manufacturing processes, liquid and gas measurement in laboratories, pilot plants, flow and level indicating, etc. 150 mm Meter with CV™ Valve. Shipped completely assembled, flow meters include standard mounting fittings in a choice of materials, side plates, thick protective magnifying front shield and back plate, optional built-in control valve, and flow tubes selected from the Flow Capacities tables.
Flow tubes for these
variable area flow meters (rotameters) are available with two types of scales, suitable for different types of applications
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.
Alternatively the flow tables and graphs can be found using our online
Flow-Tube Calibration Data Library by looking up your flow tube part number.
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 are available with built-in needle valves (CV™), high precision metering valves (MFV™) with “non-rising stems”, or with no valves. The higher cost of MFV™ valves is justified whenever high sensitivity control and resolution are desirable particularly in conjunction with metering tubes of very low flowrates.
Generally, for gas metering it is recommended that valves are positioned at inlets (bottom) for liquids valves may be positioned either at inlets or outlets (top). For vacuum services, valves must be mounted at outlets. If unspecified at the time of ordering, meters will be shipped with valves mounted at the inlets.
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 Lexan® with longitudinal magnifier lens for enhanced reading resolution |
| BACK PLATE 1/8 inch thick white acrylics |
| O-RING and PACKING Buna-n o-rings standard in aluminum and brass 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 |
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| VITON® and KALREZ® are registered trademarks of DuPont Dow Elastomers |
P / Px meter literature model P (single flow tube) and Px (multi flow tube) - Aluminum, Brass or 316 Stainless Steel meter catalog page(s)
Technical Information (Rotameter)
- Valve Flow Capacities
- Metering Sizing
- Calculation vs Calibration
- Table of Standard Flow Capacities
- Table of Direct Reading Scales
- Common Equivalents and Conversions
Optical Sensor Optical Sensor Switch accessory catalog page(s) for single flow tube model P, S, or T rotameters
Hi-Lo Optical Sensor Switch Operating Manual Hi-Lo Optical Sensor Switch Operating Manual - TD-HI-LO-OSS-052018
, May-2018
Optical Sensor Switch Operating Manual Optical Sensor Switch Operating Manual - TD-OSS-052018
, May-2018
Rotameter Catalog Full line Rotameter and Valves Catalog
Digital and Analog Flow Meters Catalog Full line Digital and Analog Flow Meters, Controllers, Valves and Accessories Catalog
