ABB RATOSIGHT 10A2235 Manuel utilisateur

1) Glass meter tubes have been designed to operate

up to maximum design working pressures listed

herein. This not to be construed as a certification

that the tubes will not break at any pressure. Inher-

ent material limitations can result in tube breakage

due to conditions beyond our control. For example,

glass is a brittle material which may break upon

impact; glass if subjected to thermal shock may

break; glass is notch sensitive in that scratches,

nicks or cracks may result in breakage when pres-

surized; incorrect installation or faulty operating

methods can cause tube breakage regardless of op-

erating pressure.

2) Glass meter tubes are not recommended for

either hot or strong alkalies, fluorine, hydrofluoric

acid, steam or water over 200oF (93oC). Glass me-

ter tubes should be periodically inspected for signs

of wear. Erosion, stress cracks, nicks or deep

scratches provide early warning for tube replace-

ment. With certain fluids, the glass may erode

evenly so wear is not visibly noticeable. If wear is

suspected, the tube should be replaced in order to

eliminate this potential cause of meter tube break-

age.

3) It is important that all materials of construction

be compatible with the service to which the Meter is

applied. It is especially important that "O" ring mate-

rial be compatible with the process fluid. Glass me-

ter tube breakage can occur in those meters using

an "O" ring as an internal seal if the improper mate-

rial is used. For example: VITON "O" RINGS MUST

NEVER BE USED FOR AMMONIA SERVICE; THE

CORROSIVE ATTACK OF AMMONIA ON VITON IS

EXTREME, CAUSING THE "O" RING TO SWELL

TO THE EXTENT OF BREAKING THE GLASS ME-

TER TUBE.

4) The Meter should never be subjected to exces-

sive vibration. Avoid the use of quick acting devices

in the fluid stream in order to prevent shock waves,

associated with such devices, from damaging the

meter.

5) The use of a pressure relief valve and/or a

rupture disc is recommended in the pipeline contain-

ing the Meter and located such to preclude glass

meter tube breakage in the event of an overpressuri-

zation of the line.

6) When applied to a high pressure gas cylinder, at

least two stepdown pressure regulators are to be

used between the Meter and the cylinder.

7) Remove pressure from the Meter before at-

tempting to remove the meter tube. 8) Be sure the

parts that serve to lock the meter end fittings in

place are secure. This should be checked before the

Meter is put into service or returned to service after

maintenance. Loose end fittings may result in glass

meter tube breakage.

9) The glass meter tube should be periodically

inspected and replaced if cracked, nicked, scratched

or worn.

INSTRUCTION MANUAL

VARIABLE AREA FLOWMETERS

10A2235 Rev.5

RATOSIGHT FLOW RATE INDICATORS

Description

The RATOSIGHT flow rate indictaor operates on the

variable area principle to indicate the flow rate of a

liquid or a gas. The basic meter components, as

shown in Figure 1, are a tapered glass tube, a float,

and a metal body. A scale is provided on the glass

metering tube. The float is guided by flutes formed

on the inside surface of the tube; the height of the

float in the tube is proportional to the flow rate, so

that the flow rate can be read from the scale at a

point opposite the grooved horizontal line of the

float. The scale on the meter tube is direct reading in

GPM, water or SCFM, air. Special scales may be

furnished, when specified.

In addition to providing a direct indication of flow

rate, an alarm extension may be installed on the

Meter to open or close alarm circuits at predeter-

mined flow rates. A magnet, connected to the float

by an extension, is moved by the float and actuates

a switch at a pre-determined point, within the range

of the Meter. For details regarding the alarm exten-

sion, refer to the 55AR1000 Instruction Manual .

NOTE

The warning was changed since this Bulletin was last published as

PN24289A

Read these instructions before starting installation;

save these instructions for future reference.

FIGURE 1. CROSS SECTION OF RATOSIGHT

FLOW RATE INDICATOR

PRESSURE RATING, METER ASSEMBLY @ 100oF (38oC)

* Maximum Design Pressure, in psig & MPa

Connection Size

NPTI

(Inches)

Meter Tube Inlet

Size

(Inches)

Pressure Rating Maximum Temperature

psig MPa oFoC

1/2 1/4 200 1.4 250 121

1/2 1/2 175 1.2 250 121

1 1 125 0.86 250 121

1 1/2 1 1/2 100 0.70 250 121

2 2 75 0.52 150 60

* For pressure rating at other temperatures, contact the factory.

Installation

The RATOSIGHT flow rate indicator is normally fur-

nished for horizontal connections. However, vertical

connections or combination horizontal-vertical con-

nections may be made by changing the locations of

the pipe plugs. Thus an over alarm extension can be

added to the Meter using a horizontal outlet. If the

Meter has a vertical inlet, a nipple and union should

be added to facilitate future removal of the float, The

various piping arrangements are shown in Figure 2.

Refer to Figure 4 for the outline dimensions of the

Meter. Install the Meter in the piping system so that

the tube is vertical. The Meter should be as free as

possible from piping strains. When installing large

indicators, use brackets or piping supports to elimi-

nate piping strains.

If the float is received separately from the instru-

ment, insert it in the tube after removing the inlet

fitting. Figure 3 shows the correct float orientation

and the reading edges. If the RATOSIGHT flow rate

indictor is equipped with an alarm extension, com-

plete the wiring as discussed in the alarm’s Instruc-

tion Bulletin.

WARNING

An operator protective shield is required

when this meter is used for compressed

gases or liquids above their boiling

point. A sheet of polycarbonate can be

used as a shield. Alternately, a series

10A4500 meter with a protective shield

included or an all metal meter can be

substituted.

FIGURE 2. PIPING ARRANGEMENTS

Operation

Start flow thru the Meter slowly to avoid excessive

flow surges which might damage the float or tube.

Flow rate is read from the scale at a point opposite

the grooved horizontal line on the float. When milli-

meter or other special scales are furnished, a cali-

bration curve may be supplied. By entering the

indicated value on this curve, the actual flow rate

can be obtained. If an alarm extension has been

furnished, refer to the appropriate Instruction Man-

ual to set the alarm point.

Maintenance

Normal maintenance consists of cleaning the float

and tube to maintain good visibility. If the meter inlet

is connected vertically, the inlet piping must be

separated to remove the float. Remove the float and

tube by taking the inlet fitting from the bottom of the

meter.

Caution

Exercise care when removing the inlet

fitting as the float and tube are free to

fall out of the meter body. Clean the

float and tube carefully with a suitable

solvent (detergent and water are usually

satisfactory), then replace the parts. To

disassemble the meter completely,

remove the float as outlined above, then

the outlet adaptor ring may be

withdrawn from the meter body. During

meter re-assembly it is recommended

that new "O" rings be used.

FIGURE 3. FLOAT READING EDGES

FIGURE 4. OUTLINE DIMENSIONS

The Company’s policy is one of continuous product improvement and the

right is reserved to modify the information contained herein without notice.

ABB Inc.

125 East County Line Road

Warminster, PA 18974 USA

Tel. 215-674-6000

FAX: 215-674-7183

ABB Instrumentation Ltd

Howard Road, St. Neots

Cambs. England, PE19 3EU

Tel. +44 (0) 1480-475-321

FAX: +44 (0) 1480-217-948

ABB Instrumentation S.p.A

Via Sempione 243

20016 Pero (Milano) Italy

Tel: +39 (02) 33928 1

Fax: +39 (02) 33928 240

ABB Automation Products GmbH

Industriestr. 28

D-65760 Eschborn Germany

Tel: +49 (0) 6196 800 0

Fax: +49 (0) 6196 800 1849

PN24289B

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