TAC Pneumatic Products Catalog

Pneumatic Liquid Flow Switch
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 Chart
Model No. Description
N100-2511 Pneumatic liquid flow switch.
Specifications
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 250�F (121�C).
Minimum liquid temperature 32�F (0�C).
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
Min. adj.
Max. adj.
Closes on
flow incr.
Opens on
flow decr.
Closes on
flow incr.
Opens on
flow decr.
a
Flow rates for these sizes are calculated.
b These GPM figures are for switch with 6 in. paddle. For 4 in. and 5 in. line pipe, the paddle is trimmed.
Typical Applications
4.2 5.6 7.5 13.7 17.5 27.5
2.5 3.5 5.0 9.5 12.0 19.0
9.3 13.3 17.7 27.0 31.0 90.0
9.0 12.5 16.5 25.0 28.5 47.0
Chiller
M
Restrictor
N100-2511
CHWS
CHWR
Pressure
Switch
Figure 1 Typical Application.
C
NO
65.0
37.0 b
50.0
27.0 b
120.0
81.0 b
122.0
76.0 b
Wire in series
with the unit starter.
N100-2511
5 in. a 6 in. a 8 in. a
125.0
57.0 b
101.0
41.0 b
245.0
118.0 b
235.0
111.0 b
190.0
74.0 b
158.0
54.0 b
375.0
164.0 b
360.0
135.0 b
375.0
205.0 b
320.0
170.0 b
760.0
415.0 b
730.0
400.0 b
F-27383-1 © Copyright 2006 TAC. All Rights Reserved. 65
N100-2