V/A MASTER™
INDICATING FLOWRATOR® METERS


The B-F&P V/A Master Flowrator meter is a glass tube variable-area flowmeter providing visual indication of flow rate over a 12 1/2 to 1 range on a linear scale.  Seals in the meter can be either 0-ring or packing gland type to suit the application.


With either type of seal, the glass meter tube can be removed easily for range change or cleaning, without disassembling the end fittings or removing the meter from the line. Both types have the same external dimensions and are interchangeable with regard to piping assembly. Also available with one or two bi-stable alarms to give contact closure (or opening) on rising or falling flow.


Universal threaded process connections allow the meter to be installed with either horizontal or vertical piping arrangements. Screw-on flanges provide the maximum in versatility.


The meter is available in tube sizes from 1/2-inch through 2-inch bore for liquid or gas service.  Dimensions meet ISA Standard RP 16.1.2.3.

Design Features
  • Rugged body design with all type 300 stainless steel construction.
  • Metering tube can be removed for range change or cleaning in 0-ring or packing type with meter in line and without disassembly of meter.
  • Polycarbonate operator protection shield designed to protect personnel from glass fragments in the event of accidental tube rupture.
  • Universal threaded process connections.
  • Screw-on flanges.
  • Rotatable end fittings.
  • Visibility of tube and float through wide angle with standard enclosure & mounting.

Engineering Specifications

Repeatability: 
   0.5% of full scale.
Accuracy:    Standard is ¡À2% of maximum flow.
Calibrated standard is i 1% of maximum flow.
Range:  12 1/2 to 1
Mounting:  Standard line mounting; Optional - panel mounting (flush, surface).

SCALES

Tube Sizes, Inches

Scale

Nominal Length

Type and Location

1/2 thru 2

10-in. (250 mm)

Percentage on tube or Direct Reading on external metal scale with blank tube.

1/2-50 (only)

9-in. (227 mm)

Materials of Construction:
Tube:    Beadguide™ borosilicate glass
USV, SV, NSV Floats: Standard - stainless steel;
0-rings: Standard - Buna N; Optional - Viton, EPR
Packing:    Standard - Neoprene; Optional - molded Teflon liner.
Fittings:    Standard - brass, stainless steel.
Float Stops: Teflon
Tube Rest Gaskets:
Standard - Klinger-Sil
Optional - Teflon (10A4600 only)

Glands:  Standard - 300 series stainless steel
Compression Screws:  Standard - 300 series stainless steel
Meter Body: 304L stainless steel
Tube Retainer Spring: Armco 17-7 pH stainless steel, external to fluid stream in 0-ring meters. 
Shield: Polycarbonate

Electrical Specifications for Alarms:
Supply Voltage: 120V ac ¡À15%, 45-65Hz
Contact Rating: Max 250V; Max 4A; Max 500VA
Sensor Switch Cable: Standard 6.5 Feet
Optional - up to 980 Feet
Safety Classification: The sensor(s) is intrinsically safe for Class I, Div. 1, Group A, B, C & D and Class II, Div. 1, Group E, F & G when connected with control amplifier mounted in non hazardous location.

Service Conditions:
Applications: Glass tube meters are not recommended for continuous service on alkalis above 100 F (38 C) or more than 20% concentrations; nor for fluorine, hydrofluoric acid, water above 200 F (93 C), steam, slurries, or molten metal.
Temperature Ratings: Minimum recommended process fluid temperature is 320F (00C). Maximum recommended process fluid temperature is 250 F (121 C).
Ambient Temperature Range 320F-1400F
Pressure Ratings: (In accordance with l.S.A. RP 16.1)

Tube Size (in)

Maximum Safe Working
Pressure @ 100 F (38 C)

psig kPa gauge
1/2 NPT 300 2069
1/2 FLGD; StL. S.S. 275 1896
1/2 FLOD; Brass 225 1551
3/4 All 200 1379
1 All 200 1379
1 1/2 All 130 896
2 All 100 689

 

Caution

Is it important that the 0-ring material be compatible with the process fluid. Meter tube breakage can occur if the wrong material is used.  For example: VITON 0-RING MUST NEVER BE USED FOR AMMONIA SERVICE. Refer to Catalog 10A1023, Rotameter Selection Guide for material selection.

WEIGHTS AND CONNECTION

Tube Size (in) Conn. Size (in)

Weight

Threaded Flanged*
lb kg lb kg
½ ½ 8.5 3.9 12 5.5
¾, 1 ¾ NPT 17 7.5 -- --
¾, 1 1 FLGD -- -- 21 9.5
1½, 2 29 13 35 16

* Flanges match drilling of ANSI Class 125/150 Flanges.

Accessories

Metal Scale Plate(s): Graduated metal scale plate mounted adjacent to metering tube.
Alarms: One or two* Bi-stable alarm switches, adjustable over entire scale length to give contact closure (or opening) upon rising or falling flow.   Available with SPDT or DPDT switch action.
Surface (Front) Panel Mounting: Nuts, bolts, and lock washers for mounting meter against front of panel by means of mounting holes provided in every meter body.
Flush (Rear) Panel Mounting: Brackets, bezel and hardware for mounting meter behind panel.
Metering Float Thermal Expansion: (Due to differences in thermal expansion between glass tube and metal float). Float head reduction required for operating temperatures exceeding (for 316 sst) tube sizes 1/2", 3A", & 1 1/2" 140 F (60 C), 2" 120 F (49 C).
Welded Flanges: Upon request, flanges nipples - end fittings can be supplied as a welded assembly.

*Note when using two switches - the minimum spacing is on 1" centers (approx. 10% of full scale).

Capacity Table
LOW PRESSURE DROP DESIGN

Tube Size Maximum Flow Tube Number Float Number (316 sst) Total delta P (See Note 1) V.I.C.
(See Note 2)
psia
Critical
(See Note 3)
gpm H2O
Equiv
scfm Air Equiv
1/2"

0.198

0.800

FP-½-17-G-10

1/2-GUS-410

0.53

2.20

3.60

0.238

0.982

FP-½-21-G-10

1/2-GUSVT-410

0.53

2.20

3.60

0.324

1.339

FP-½-27-G-10

1/2-GUSVT-410

0.58

2.20

3.60

0.436

1.796

FP-½-35-G-10

1/2-GUS-410

1.00

2.20

3.60

0.825

3.40

FP-½-50-G-9

1/2-GUSVT-410

2.00

2.20

3.60

3/4"

0.633

2.62

FP-¾-21-G-10

3/4-GUSVT-510

0.60

3.30

3.10

0.860

3.54

FP-¾-27-G-10

3/4-GUSVT-510

0.71

3.30

1.50

1"

1.205

4.98

FP-1-27-G-10

1-GUSVT-611

1.28

4.00

1.00

1.67

6.90

FP-1-35-G-10

1-GUSVT-611

1.83

4.00

0.75

2.58

10.70

FP-1-27-G-10

1-GUSVT-610

5.47

8.60

4.50

3.60

14.84

FP-1-35-G-10

1-GUSVT-610

7.97

8.60

3.40

1 1/2"

2.45

10.30

FP-1½-21G-10

1½-GUS-867

0.92

6.50

1.00

3.33

13.80

FP-1½-27-G-10

1½-GUS-867

1.24

6.50

1.00

6.50

27.00

FP-1½-21-G-10

1½-GUSVGT-814

5.75

16.20

6.80

8.70

36.00

FP-1½2TG-10

1½-GUSVGT-814

7.20

16.20

6.80

2"

5.54

22.90

FP-2-27-G-10

2-GUSVT-913

1.65

8.90

1.00

13.75

56.70

FP-2-27-G-10

2-GUSVT-914

9.00

22.00

6.20