155481 Gems Sensors Inc, 155481 Datasheet - Page 2

• Manufacturer Part Number: 155481
• Description: Flow Sensor
• Manufacturer: Gems Sensors Inc

Specifications of 155481

• Accuracy: +/-15%
• Operating Pressure Range: 100psig At 70°F
• 40psi Max. At 180°f: Sensing Accuracy
• Body Material: Polypropylene
• Mounting Type: 1/2-inch NPT
• Operating Temperature Range: 0°C To +25°C
• Port Size: 0.5"
• Connection Size: 1/2"
• Features: Visual Flow
• Flow Range: 4 To 20 GPM
• Flow Rate Max: 20GPM (US)
• Flow Rate Min: 4GPM (US)
• Leaded Process Compatible: No
• Rohs Compliant: No
• Accuracy %: 15%
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Operating Principle
1. As liquid passes through the RotorFlow body, the magnetic rotor spins at a rate
proportional to flow. This causes a series of magnetic fields (the rotor vanes) to excite
the Hall Effect sensor, producing a series of voltage pulses.
2. The output pulses (RFO) are at the same voltage level as the input (4.5 - 24 VDC)
with a frequency proportional to the flow rate. The output signal can be utilized by
digital rate meters totalizers or other electronic controllers. RFA Type analog sensors
condition the output signal to 0-10 VDC.
3. RotorFlow Indicators may be mounted with flow entering either port. Performance
is optimized by positioning ports at the top of the unit, in a horizontal plane.
Frequency vs. Flow Rate-Typical
*Low Flow Adapter
FLOW OUT
Flow Rate
(GPM)
0.10
0.25
0.50
0.75
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
6.0
7.0
8.0
9.0
10
11
12
13
14
15
16
17
18
19
20
25
30
35
40
45
50
55
60
PARTIAL
CUTAWAY
.25˝
110
128
148
168
185
15
34
54
73
90
.25˝ with
Adapter*
137
186
13
41
90
RFO Model – Based on Port Size
HALL EFFECT SENSOR
SENDS A VOLTAGE PULSE
WITH EACH PASS OF
MAGNETIC FIELD
Output Frequency – Hz
MAGNETIZED ROTOR
.50˝
44.8
65.9
87.5
110
122
135
147
158
170
183
195
207
220
34
55
76
99
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FLOW IN
.50˝ with
Adapter*
25.9
76.7
111
129
147
165
185
204
17
34
43
60
94
.75˝
128
163
196
24
61
93
12
0
107
123
137
153
170
185
22
30
43
60
74
91
1˝
TIME
Pressure Drop-Typical
Standard
Flow
Range
Units
Low Flow
Range
Units
High Flow
Units
Signal Output
Output signal for RFO Types is an on/off pulse of the
DC voltage supplied to the unit, it is compatible with all
digital logic families. Input voltage range is 4.5 to 24
VDC. Frequency of the output pulse is proportional to
the flow rate and ranges from approximately 15 Hz at
low flow to 225 Hz at high flow.
Example:
Low Flow
High Flow
Note: Consult factory for flow rate/frequency curves.
+VDC
12
12
9
6
3
0
9
6
3
0
9
6
3
0
0 1 2 3 4 5
0
0
.1 .2 .3 .4 .5 .6 .7 .8 .9
Ports
1/4˝
1/4˝ Ports
12
12
10
0
0
Ports
20 30 40 50 60 70 80 90
3/4˝
1.0
Flow Rate – GPM
Flow Rate – GPM
2
Flow Rate – GPM
10
TIME
3
TIME
4
1/2˝ Ports
15
5
1/2˝ Ports
RFO TYPE
1.0˝ Ports
10
20
+VDC
100
+VDC
25
15
110
12
F-5
0