High Accuracy Pitot Tubes

FPT-6100 and FPT-6200

Up to ±1% of Rate Accuracy
Easy Installation – Ideal for Retrofits
Very Low Pressure Drop
Low Maintenance
For Clean, Low Viscosity Liquids, Gases, and Steam
Valves Included as Standard

Description

THIS PRODUCT REQUIRES YOU TO CONSULT WITH SALES PRIOR TO ORDERING
Please be prepared to complete the Vortex/Pitot Tube Order Questionaire so you can fax or email it to our sales department.

The FPT-6000 is a highly accurate averaging pitot tube which generates a pressure differential between its upstream (stagnation) ports and its downstream (static) ports that is proportional to the flowrate squared (Q2 ). The differential pressure can then be measured by a differential pressure transducer to provide a 4-20 mA output which is proportional to the flowrate squared. This can then be read out as flowrate by devices with square root extraction, such as OMEGA’s DPF64-SQRT meter or FC-20 mass flow computer. The FPT-6000 can be used to measure clean, low viscosity liquids, gases and steam in a variety of piping systems and pipe sizes (to 72” and above on special order).

The FPT-6000 offers the following advantages over orifice plates: easy, low-cost installation (weld 1 small coupling into place vs. 2 large flanges); much lower permanent pressure loss; low maintenance (occasionally forcing gas through the pressure ports clears the sensing ports when dirt is a problem); and good resistance to wear. Bi-directional flow measurement capability is standard. And, with special double-mount construction, the flow ranges listed can be extended by to up to 4 times

SPECIFICATIONS
Accuracy: Up to 1% of rate (see sizing). (Accuracy stated is for use in schedule 40 pipe. If used in schedule 80 pipe, add 1% to accuracy or request special construction)
Repeatability: ±0.1% of rate
Max Temperature:
    FPT-6100: 93°C(200°F)
    FPT-6200: 204°C (400°F)
Max Pressure:
    FPT-6100: 150 psig     FPT-6200: 1500 psig
Unrecoverable Pressure Drop (inches H₂O): = DP x (CP/D)
    where: DP = generated differential pressure (inches H₂O)
    CP = pressure loss coefficient
    = 0.296 for ³⁄8" diameter probe
    = 0.387 for ½"
    = 0.757 for ¾"
    = 0.945 for 1"
    D = inside pipe diameter (inches)
Wetted Parts:
    FPT-6100: 316SS shaft, brass packing and head, carbon steel weld coupling, ¼" SAE flair brass valve;
    FPT-6200: 316SS shaft, packing and head, carbon steel weld coupling, ½ FNPT Carbon Steel block valves
Dimensions
    For Model FPT-6100: Add 4⁷⁄8" to line size to determine overall length without valves. Add 7½" to line size to determine clearance required to install unit.
    For Model FPT-6300: Add 8¼" to line size to determine overall length without valves. Add 11½" to line size to determine clearance required to install unit

Sizing Equations
1. Any Liquid: ΔP (in. H₂O) = Q²(GPM) x S_f / K² x D⁴₁ x 32.14
2. Steam or Any Gas (steam requires min ΔP of 10" H₂O): ΔP (in. H₂O) = Q2(lb/hr) / K₂ x D⁴₁ x ρ x 128,900
3. Any Gas: ΔP (in.H₂O)= Q² (scfm) x S_S x (T + 460) / K² x D⁴₁ x P x 16,590

Where:
ΔP = differential pressure (in inches H₂O)
Q = flowrate
K = flow coefficient (see “how to order”)
D₁ = inside diameter of line size (in inches for square and rectangular ducts use): D₁ = √(4 x height x width / Π)
P = static line pressure (psia)
T = temperature (in °F)
ρ = density of medium (in pounds per cubic foot)
S_f = Sp. Gr. at flowing conditions
S_s = Sp. Gr. at 15°C (60°F)

NOTE: Use of these equations for liquids yields an accuracy of ±2% of rate. When used for steam, accuracy is ±10% of rate (when steam tables are used). Gas equation yields ±2% of rate accuracy from 21 to 204°C (70 to 400°F) and 0 to 150 psig (when gas is not near its critical point). A ±1% of rate accuracy requires the use of more precise equations which account for shift in K with change in flowrate, gas compressibility, etc. Request a precision flow calibration sheet and please supply the following data: name of fluid, specific gravity, pressure, temperature, inside pipe diameter, viscosity, steam quality, degrees superheat, and ratio of specific heat at constant pressure to that at constant volume (for gas velocities approaching 500 fps).

† All amounts shown in EUR, GBP, or USD
Note: Max. differential pressure shown is for up to 150°C (300°F). Above 150°C (300°F), reduce value by 4% per 56°C (100°F). †
THIS PRODUCT REQUIRES YOU TO CONSULT WITH SALES PRIOR TO ORDERING
Please be prepared to complete the Vortex/Pitot Tube Order Questionaire so you can fax or email it to our sales department.
Comes with complete operator's manual.