Datasheet

68
www.gems-sensors.co.uk
LEVEL
& FLOW
RFA, RFO, RFS
Polypropylene Bodies
Metal Bodies
TW H D D P
DC models AC models
1/4 77 60 61 114 20
1/2 77 60 61 114 22
3/4 100 66 75 121 27
1 100 66 75 121 27
63.5
78
63.5
78
60
P
D
H
20
RFA, RFO, RFS DC - 61
RFS AC - 115
T
T
125
Adaptors, See Note 2, page 67
Installation and Maintenance
A proper installation will enhance RotorFlow sensor performance. Install using standard
pipe fitting tools; horizontal fluid lines are recommended. For further installation and
maintenance recommendations, refer to one of the following instruction bulletins: RFO
Types - Part Number 157258; RFI Types - Part Number 157259; RFS Types - Part
Number 157261. Since their function is to monitor dynamic fluid flow, naturally the rotor
will react to turbulence, pulsation, entrained air, and other flow anomalies induced in the
flow stream by other process hardware. For optimum performance, install RotorFlow
units where nominal flow conditions exist with ports located at the top. Incoming flow
may be placed to either port; a minimum of 20 cm of straight pipe on the inlet side is
required. When operating in the low flow range, the supplied Low Flow Adapter must be
installed in the incoming port.
RotorFlow sensors connect to piping via NPT mating thread forms. The use of an
appropriate thread sealant is necessary to assure a leak-tight connection. Permatex
“No More Leaks” or 2 wraps of Teflon tape are the only sealants recommended for
GEMS flow sensors. 150 micron filtration is recommended. However, should foreign
particles enter RotorFlow sensor, accumulation is easily cleared by removing the lens
from the body. The lens is removed by turning its centre rib 45° counter-clockwise,
and then pulling it out. To reinstall the lens, simply reverse the process.
Important: In either case, pressure must be relieved from
the system prior to sensor clean-out.
Low Flow Applications
A low flow adaptor is supplied with all Rotorflow units.
It is used to produce accurate response at low flow rates.
Install the adapter, as shown above, in the port selected
for incoming flow.
Panel Mounting
Any RotorFlow sensors may be panel mounted using holes
integrated into the bodies.
Two (2) mountings ears are provided at the body centre
line to receive 3.5mm ø self tapping screws (e.g. DIN
7971-B 3, 5 x 19) to accommodate panel mounting of the
plastic RotorFlow units.
Note: ANSI T type 23 self-tapping screw are
recommended. They may be replaced with standard
machine screws if reinstallation should be required.
Incoming
flow
Low Flow Adaptor
May also be fitted into adaptors used for
plastic units
Min. 200mm
63.5mm
Ø 3.6 mm
Pressure Drop Typical throughout all options
0.8
0.6
0.4
0.2
0
0.6
0.4
0.2
0
0 4 8 12 16 20 40 60 80 100
Flow Rate - (l/min)
0 1 2 3 5 10 15 20 40 60
Flow Rate - (l/min)
1/4"
1/4"
1/2"
1/2"
3/4"
Standard Flow Range Units
Low Flow Range Units
High Flow Units
1.0
Dimensions (in mm)
12
9
6
3
0
0 10 20 30 40 50 60 70 80 90 100 110
ROTOR & TURBINE