RATOSIGHT FLOW RATE INDICATOR with OPTlONAL RATOLARM

The Bailey-Fischer & Porter Series 1CA2235A Ratosight flow rate indicator is a rugged, low cost, glass tube, variable area flowmeter that provides stable and reliable operation while measuring liquid or gas flow rates. This indicator can be supplied with Ratolarm extension (Series 10A2235-OA) for alarm actuation. The alarm unit can house one or two vibration-proof magnetic switches with relays. Each switch is fully adjustable over the entire operating range of the flowmeter.

To provide fail-safe operation, the Ratolarm relay is wired so that its coil is energized during normal flow. Upon power failure, the relay coil is deenergized causing the relay contacts to assume the alarm position. These relay contacts may be wired for normally open or normally closed alarm action or both, simply through connection to appropriate posts on the terminal strip. Typical applications include the automatic shut-down of heavy equipment when bearing lubricant flow becomes too low, the shut-down of electrical equipment when cooling water flow falls below a preset limit, or the actuation of auxiliary equipment such as pump motor starters or solenoid valves.
ratosight.JPG (8690 bytes)
Design Features
  • Easily Cleaned - Disassembly is simplified by 0-ring construction.
  • Virtually Maintenance-Free - Cast bronze body and heavy-walled glass tube construction provide protection from mechanical and thermal stresses.
  • Reliable - "Fail-Safe" alarm construction pro vides alarm actuation in the event of power failure.
  • Versatile - Relay contacts can be externally wired at installation for either normally open, normally closed, or both.
  • No False Alarms - Vibration-proof switch pre vents accidental actuation.
 

ENGINEERING SPECIFICATIONS
TABLE I. PERFORMANCE

Connection Pipe Size

Safe Working Press

Approx. Scale Length

Repro-
ducibility % Full Scale

Std. Accuracy % Full Scale

Opt. Accuracy w/calib. % Full Scale

psig

kPa

inches

mm

1/2" NPT

175

1206

1-1/2

38

¡À 2% ¡À 10% ¡À 5%

1" NPT

125

861

2-1/2

63

¡À 2% ¡À 5% ¡À 3%

1-1/2" NPT

100

689

3-1/2

90

¡À 2% ¡À 5% ¡À 3%
2" NPT 75 517 4 100 ¡À 2% ¡À 5% ¡À 3%

Maximum Temperature Rating 2500F, (121 0Q)
Minimum Recommended Temperature 320F (00C)
Connections:  Threaded NPTI

Materials of Construction:
Metering Tube: Borosilicate glass

Float: Standard - brass for liquids, aluminum for gases; stainless steel float extension is used on alarm units for liquids and gases. Optional - Monel float for liquids only.
Body: 85-5-5-5 bronze
0-rings: Standard, Buna N; optional, Viton A.
Alarm Extension Well: 316 stainless steel
Alarm Base and Housing: Standard, weather tight aluminum.
Scale: Etched directly on tube in either gpm water or scfm air at 14.7 psia and 70 F (101 kPa & 21 C).  Other scales optionally available.
Mounting & Piping: Indicator can be mounted in horizontal or vertical piping runs using any of the four arrangements shown below. Horizontal standard - other arrangements optional.

TABLE II. CAPACITIES
Flow Rate Indicator - 10A2235A

Connection Pipe Size

gpm *
Water

scfm ** Air
at 14.7 psia
and 70 F

min.

max. H2OdeltaP(1) Model
No.
(2)

min.

max. H2OdeltaP(1) Model
No.
(2)
in mm in mm

1/2" NPT

0.02

0.36

6.5

165

B

0.05

0.60

1.4

36

B

0.05

0.60

17.0

432

C

0.10

1.3

4.6

117

C

0.10

1.00

7.0

178

D

0.20

2.0

1.4

36

D

0.20

2.00

21.0

533

F

0.50

4.5

5.5

140

F

0.40

3.00

34.0

864

C

0.50

7.0

10.0

254

C

0.60

4.00

59.0

1499

H

1.5

9.0

14.5

368

K

1" NPT

0.50

6.00

13.0

330

J

1.0

14.0

4.5

114

L

0.50

8.00

21.0

533

K

2.0

20.0

8.0

203

N

1.0

11.00

35.0

889

L

2.0

26.0

13.0

330

P

1-1/2" NPT

1.0

15.00

18.0

457

M

4.0

36.0

8.5

216

Q

2.0

20.00

29.0

737

N

5.0

50.0

12.0

305

R

2.0

24.00

44.0

1118

P

5.0

60.0

19.0

483

S

2" NPT

3.0

35.00

22.0

559

Q

8.0

80.0

8.0

203.0

T

4.0

50.00

45.0

1143

R

10.0

110.0

15.0

381.0

U

NOTE: (1) delta P values in above table are maximum pressure drops using horizontal connections. When vertical con-
nections are used, the pressure losses are approximately 25% lower.
(2) Use this code to complete model number.

WARNING
All gas applications at pressures exceeding 50 psig and all flashing liquid applications should be handled by using either all metal meters or glass tube meters with an externally installed operator protection shield. This precaution is recommended because of the danger of accidental breakage of the glass tube under pressure.

TABLE III. FLOW RATE INDICATOR WITH ALARM
10A2235A -- OA

Connection Pipe Size

gpm *
Water

scfm ** Air
at 14.7 psia
and 70 F

min.

max. H2OdeltaP(1) Model
No.
(2)

min.

max. H2OdeltaP(1) Model
No.
(2)
in mm in mm

1/2" NPT

0.1

1.3

7.5

191

E

0.5

5.5

7.5

191

F

0.2

2.0

16.0

406

F

0.5

8.5

16.0

406

H

0.6

4.0

59.0

1499

H

1.0

9.0

59.0

1499

J

1" NPT

0.50

6.00

13.0

330

J

1.0

14.0

13.0

330

L

0.50

8.00

21.0

533

K

2.0

19.0

21.0

533

M

1.0

11.00

35.0

889

L

2.0

26.0

35.0

889

P

1-1/2" NPT

1.0

15.00

22.0

559

M

4.0

36.0

8.5

216

Q

2.0

20.00

29.0

737

N

5.0

50.0

12.0

305

R

2.0

24.00

44.0

1118

P

5.0

60.0

19.0

483

S

2" NPT

3.0

35.00

22.0

559

Q

8.0

80.0

8.0

203.0

T

4.0

50.00

45.0

1143

R

10.0

110.0

15.0

381.0

U

(1), (2) see above.
*gpM x 3.785 = Liters per minute or L/min.
**scfm x 0.0284 = cubic meters per minute or M3/min.

TABLE IV. WEIGHTS

Connection Pipe Size

10A2235

10A2235A-OA

pound

kilogram

pound

kilogram

1/2'

4

1.8

7

3.2

1"

9

4

12

5.40

1-1/2"

14

6

19

8.50

2"

30

13.5

35

16.0

ACCESSORIES
Special indicating scale
High voltage relay
Double pole, double throw relay
Hermetically sealed relay

Accessory Alarm & Relay Specifications


Relays (Maximum of two per meter)

Standard - Dustproof Construction
Optional - Hermetically sealed

Relay Switch Action

Standard - Single pole, double throw
Optional - Double pole, double throw
(requires special relay base)


Relay Holding Coil Voltage
Standard - 120V ac, 50/60 Hz
Optional - 240V ac, 50/60 Hz;
24, 48, 120 or 240V dc.


Relay Contact Rating (Resistive Load)
Standard:    120V ac, 50/60 Hz, 10A (SPDI switch), 5A (DPDI switch)
Optional:    240V ac 50/60 Hz, 5A (SPDT switch),
2.5A (DPDT switch). 120V dc 0.5A (SPDI switch),
0.25A (DPDT switch). 240V dc 0.25A (SPDT switch),
0.12A (DPDT switch).
For other ratings or inductive load relay contact rating, consult Bailey-Fischer & Porter.

Alarm Switch Contact Rating
Applicable only when relay is omitted (resistive load)
15 VA, lA (Max), 250V (Max) (ac or dc). Arc
suppression should be used on inductive loads.


Alarm Switch Differential (Fixed)
Maximum 8% of full scale


Electrical Consumption
1-1/2 to 2W per alarm


Safety Classification
The alarm, with a hermetically sealed relay is non-incendive for Class I, Division 2, Groups A, B, C & D.