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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 .
* Maximum Design Pressure, in psig & MPa
Connection Size
Meter Tube Inlet
NPTI
(Inches)
1/2
1/2
1
1 1/2
2
* For pressure rating at other temperatures, contact the factory.
The warning was changed since this Bulletin was last published as
2
PRESSURE RATING, METER ASSEMBLY @ 100
Pressure Rating
Size
psig
(Inches)
1/4
200
1/2
175
1
125
1 1/2
100
2
75
Read these instructions before starting installation;
save these instructions for future reference.
Copyright 2002 ABB Inc. [May, 2002]
FIGURE 1. CROSS SECTION OF RATOSIGHT
FLOW RATE INDICATOR
MPa
1.4
1.2
0.86
0.70
0.52
NOTE
PN24289A
o
o
F (38
C)
Maximum Temperature
o
o
F
250
121
250
121
250
121
250
121
150
60
C
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