Brochure

Cleveland Controls
Division of UniControl Inc.
Cleveland Controls
DIVISION OF UNICONTROL INC.
1111 Brookpark Rd
Cleveland OH 44109
Tel: [phone]
Fax: [phone]
Email:[e-mail]
Web page: http://www.clevelandcontrols.com
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Bulletin LTNS2-11
APPLICATION
Series NS2™ Air Flow Pressure Sens-
ing Switches are designed with sturdy,
contaminant-free construction, to provide
low cost, high accuracy and reliability.
NS2 switches offer a narrow switching dif-
ferential and low set point tolerance over a
wide operating temperature and set point
range. They can be used to sense positive,
negative or differential air pressure. Factory-
calibrated set points are available from 0.05″
to 10.0″w.c.
The glass-lled polycarbonate body of
the switch provides a high degree of stability
and accommodates many sample line con-
nector options. The high and low pressure
ports are color-coded for ease of identica-
tion. Port, bracket, and terminal orientations
can be specied. The integral snap-acting
switch mechanism (patent pending) is avail-
able in SPNO, SPNC, and SPDT terminal
congurations.
An optional bleed hole is available,
as well as numerous standard and cus-
tom mounting brackets. Please consult
Cleveland Controls about the many custom
features we offer.
GENERAL DESCRIPTION &
OPERATION
The glass-filled polycarbonate housing
contains a sensing diaphragm and includes
an integral snap-acting switch. Sample line
connectors are located on either or both
sides of the diaphragm to accept air sample
connections.
The electrical connection consists of
male 90° quick-connect terminals.The snap
action switch can be actuated by a pres-
sure or vacuum air ow, or by a pressure
or vacuum differential.
MOUNTING
Various mounting brackets are available.
Figure 1 shows two typical styles. Select a
mounting location free from vibration. Mount
with the diaphragm vertical, or at a custom
angle. Specify the mounting position when
ordering. Avoid mounting with the sample
line connections directed upward.
ELECTRICAL CONNECTIONS
The snap switch has 90° male quick con-
nect terminals in 1/4" (standard) or 3/16"
(optional) sizes. Before pressure is applied
to the diaphragm, the switch contacts will
be in the deactivated position as shown in
Figure 2.
AIR SAMPLING CONNECTION
Series NS2 switches are available with
many different types of sample line connec-
tions that accept a wide range of exible and
rigid sample line tubing. See Figure 3.
Series
NS2
™
OEM AIR PRESSURE SENSING SWITCHES WITH FIXED SET POINT
AIR SAMPLING METHOD
The High or Positive inlet (P1) is black and
the Low or Negative inlet (P2) is gray. Con-
nect the sample lines as follows:
Positive Pressure Only: Connect the
sample line to P1; P2 remains open to the
atmosphere.
Negative Pressure Only: Connect the
sample line to P2; P1 remains open to the
atmosphere.
Two Negative Samples: Connect higher
negative sample to P2; lower sample to
P1.
Two Positive Samples: Connect higher
positive sample to P1; lower sample to
P2.
One Positive and One Negative: Connect
positive sample to P1; connect negative
sample to P2.