Sensia NuFlo User manual
NUFLOTM
2-inch Gas Flowmeter
User Manual
Manual No. 9A-100079591, Rev. 01
All Rights Reserved.
Printed in the United States of America.
Manual No. 9A-100079591, Rev. 01
September 2009
September 2009 iii
Table of Contents
Section 1—Introduction................................................................................. 5
Operating Principles ...........................................................................................................5
Specications ......................................................................................................................6
Section 2—Setup and Calibration............................................................... 11
Installation.......................................................................................................................... 11
Calibration of Electronic Readout Equipment................................................................ 11
Absolute Pressure and Temperature .........................................................................12
Calculating Gas Volume in Actual Cubic Feet...........................................................12
Calculating Gas Volume in Standard Cubic Feet...................................................... 13
Determining the Divisor for Readout in Standard Cubic Feet .................................13
Effects of Supercompressibility .................................................................................14
Calibrating Equipment for Readout in Standard Cubic Feet Per Unit of Time ......14
Effects of Fluctuating Temperatures..........................................................................15
Effects of Fluctuating Pressures................................................................................16
Section 3—Maintenance ............................................................................. 21
Removing and Replacing Cartridges...............................................................................21
Flowmeter Assemblies......................................................................................................22
Spare Parts.........................................................................................................................22
Accessories .......................................................................................................................22
iv September 2009
September 2009 5
Section 1
Introduction
The NuFlo 2-in. Gas Flowmeter is a turbine owmeter, housed inside an insert element that is placed between
two raised-face anges. Continuous stud bolts draw the anges together against the housing element, and
gaskets on the face of the anges and meter body help ensure a competent seal. Bolts, nuts, and gaskets are
available as part of an optional hardware installation kit.
All internal components—the rotor and shaft assembly, bearings, and setscrews—are contained within a car-
tridge inside the meter. Three different cartridges are available to accommodate high, standard, and low ow
ranges (see Figs. 1.2 through 1.4, pages 3 through 5).
An electromagnetic pickup screwed into the receptacle on the side of the meter produces the output signal.
Figure 1.1—Flowmeter components
Operating Principles
The gas to be measured is owed through the meter. As the gas passes the rotor, it impinges against the
pitched rotor blade, causing the rotor to spin at a speed directly proportional to the velocity of the gas stream.
As the rotor spins, its blades interrupt the magnetic eld set up by the pickup. This interruption induces a
voltage in the coil of the pickup. The readout instrument senses this voltage pulse and converts it into a usable
form that indicates gas volume.
6 September 2009
Specications
Size 2-in. (50.8 mm)
End Connections Flowmeter installs between two raised face
anges
Working Pressure 0 to 2220 psig (15,306 kPa)
Nominal Calibration Factor
Low Range 325 p/ACF (16600 p/m3)
Standard Range 125 p/ACF (4415 p/m3)
High Range 70 p/ACF (2472 p/m3)
Output Frequency 5 to 320 Hz over rated range
Output Voltage 30 mV peak to peak at 5 Hz, 900 mV peak to peak
at 320 Hz
Pressure Drop Less than 1-in. (24.5 mm) water column at maxi-
mum rated ow
Linearity +/- 2% of reading
Repeatability +/- 0.5% of reading
Temperature 0º to 225ºF (-18º to 107ºC)
Pickup Connector Mates with AN3106A-10SL-4P
Conduit Connection 1-in. (25.4 mm)
Pressure Tap 1/8-in. NPT (3.2 mm)
Compliances CSA Certied Hazardous locations Class I,
Groups A, B, C, D, Div. 1, ANSI 12.27.01-2003
Single Seal
Certied by Cameron in compliance with pre-
qualied materials of NACE MR0175/ISO 15156.
This certication does not imply or warrant the
application of the product in compliance with
NACE MR0175/ISO 15156 service conditions in
which the customer/user installs the product.
September 2009 7
Figure 1.2—High gas ow range
where
Q(.6) = Flow rate on graph at operating pressure
G = Sp. Gr. of other gas
Q(g) = Flow rate for other gas
Flow rate ranges are based on 0.6 Sp. Gr. gas.
To determine capacity for other gases, use:
2832000
1416000
566400
283200
141600
56640
28320
14160
5664
2832
1416
566.4
283.2
141.6
56.6
28.3
2000
(13800)
1000
(6900)
500
(3450)
200
(1380)
100
(690)
50
(345)
20
(138)
10
(69)
5
(34.5)
2
(13.8)
1
(6.9)
1
2
5
10
20
50
100
200
500
1000
2000
5000
10000
20000
50000
100000
CU. M/DAYMCFD(SCFM)
(69444.4)
(34722.2)
(13888.9)
(6944.4)
(3472.2)
(1388.9)
(694.4)
(347.2)
(138.9)
(69.4)
(34.7)
(13.9)
(6.9)
(3.5)
(1.4)
(0.7)
FLOWING PRESSURE, PSIG (kPa)
(.6)
(g)
0.6
Q Q
=G
8 September 2009
Figure 1.3—Standard gas ow range
where
Q(.6) = Flow rate on graph at operating pressure
G = Sp. Gr. of other gas
Q(g) = Flow rate for other gas
Flow rate ranges are based on 0.6 Sp. Gr. gas.
To determine capacity for other gases, use:
2832000
1416000
566400
283200
141600
56640
28320
14160
5664
2832
1416
566.4
283.2
141.6
56.6
28.3
2000
(13800)
1000
(6900)
500
(3450)
200
(1380)
100
(690)
50
(345)
20
(138)
10
(69)
5
(34.5)
2
(13.8)
1
(6.9)
1
2
5
10
20
50
100
200
500
1000
2000
5000
10000
20000
50000
100000
CU. M/DAYMCFD(SCFM)
(69444.4)
(34722.2)
(13888.9)
(6944.4)
(3472.2)
(1388.9)
(694.4)
(347.2)
(138.9)
(69.4)
(34.7)
(13.9)
(6.9)
(3.5)
(1.4)
(0.7)
FLOWING PRESSURE, PSIG (kPa)
(.6)
(g)
0.6
Q Q
=G
September 2009 9
Figure 1.4—Low gas ow range
where
Q(.6) = Flow rate on graph at operating pressure
G = Sp. Gr. of other gas
Q(g) = Flow rate for other gas
Flow rate ranges are based on 0.6 Sp. Gr. gas.
To determine capacity for other gases, use:
2832000
1416000
566400
283200
141600
56640
28320
14160
5664
2832
1416
566.4
283.2
141.6
56.6
28.3
2000
(13800)
1000
(6900)
500
(3450)
200
(1380)
100
(690)
50
(345)
20
(138)
10
(69)
5
(34.5)
2
(13.8)
1
(6.9)
1
2
5
10
20
50
100
200
500
1000
2000
5000
10000
20000
50000
100000
CU. M/DAYMCFD(SCFM)
(69444.4)
(34722.2)
(13888.9)
(6944.4)
(3472.2)
(1388.9)
(694.4)
(347.2)
(138.9)
(69.4)
(34.7)
(13.9)
(6.9)
(3.5)
(1.4)
(0.7)
FLOWING PRESSURE, PSIG (kPa)
(.6)
(g)
0.6
Q Q
=G
10 September 2009
Table of contents
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