Brochure

N100-2511
Pneumatic Liquid Flow Switch
Model Chart
Specifications
Typical Applications
Figure 1 Typical Application.
The control port opens on no flow and closes on liquid flow.
Features:
• Used with P/E Switch, reduces installation cost when flow sensing
location is located a considerable distance from the desired electrical
switching point.
• If used with a DPDT P/E Switch, one circuit can be used to stop (or
start) a motor, while the other circuit closes to initiate an alarm.
• Paddles for 1 in., 2 in., and 3 in. pipe included.
Model No. Description
N100-2511 Pneumatic liquid flow switch.
Case 0.062 in. cold rolled steel finish.
Cover 0.028 in. cold rolled steel.
Finish Gray baked enamel.
Maximum liquid pressure 150 psig (1034 kPa).
Maximum liquid temperature 250qF (121qC).
Minimum liquid temperature 32qF (0qC).
Flow Signal passes.
No flow Signal exhausts.
Restrictor Requires one N100-0010, N4-32, or N100-2501.
Dimensions 4-17/32 W x 4-25/32 H x 2-13/16 D (115 x 121 x 71 mm).
Typical Flow Rates  GPM Required to Actuate Switch.
Line Pipe Size 1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in.
4 in.
a
a
Flow rates for these sizes are calculated.
5 in.
a
6 in.
a
8 in.
a
Min. adj.
Closes on
flow incr.
4.2 5.6 7.5 13.7 17.5 27.5
65.0
37.0
b
b
These GPM figures are for switch with 6 in. paddle. For 4 in. and 5 in. line pipe, the paddle is trimmed.
125.0
57.0
b
190.0
74.0
b
375.0
205.0
b
Opens on
flow decr.
2.5 3.5 5.0 9.5 12.0 19.0
50.0
27.0
b
101.0
41.0
b
158.0
54.0
b
320.0
170.0
b
Max. adj.
Closes on
flow incr.
9.3 13.3 17.7 27.0 31.0 90.0
120.0
81.0
b
245.0
118.0
b
375.0
164.0
b
760.0
415.0
b
Opens on
flow decr.
9.0 12.5 16.5 25.0 28.5 47.0
122.0
76.0
b
235.0
111.0
b
360.0
135.0
b
730.0
400.0
b
N100
-
2
Chiller
C
NO
Pressure
Switch
Wire in series
with the unit starter.
M
Restrictor
CHWR
CHWS
N100-2511
F-27383-1 © Copyright 2006 TAC. All Rights Reserved. 65