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Motorola Sensor Device Data
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Nylon Screws
Motorola recommends the use of #6–32 nylon screws as a
hardware option. However, they should not be torqued
excessively. The nylon screw will twist and deform under
higher than recommended torque. These screws should be
used with a nylon nut.
Rivets
Rivets are excellent fasteners which are strong and very
inexpensive. However, they are a permanent connection.
Plastic rivets are recommended because metal rivets may
damage the plastic package. When selecting a rivet size, the
most important dimension, besides diameter, is the grip range.
The grip range is the combined thickness of the sensor
package and the thickness of the mounting surface. Package
thicknesses are listed below.
Port Style
Thickness, a
Grip Range = a + b
Single side port
Dual side port
Axial side port
Stovepipe port
0.321
″
(8.15 mm)
0.420
″
(10.66 mm)
0.321
″
(8.15 mm)
(Does not apply)
a
b
Push–Pins
Plastic push pins or ITW FasTex “Christmas Tree” pins are
an excellent way to make a low cost and easily removable
connection. However, these fasteners should not be used for
permanent connections. Remember, the fastener should take
all of the static and dynamic loads off the sensor leads. This
type of fastener does not do this completely.
HOSE APPLICATIONS
By using a hose, a sensor can be located in a convenient
place away from the actual sensing location which could be a
hazardous and difficult area to reach. There are many types
of hoses on the market. They have different wall thicknesses,
working
pressures,
working
compositions, and media compatibilities. All of the hoses
referenced here are 1/8
″
inside diameter and 1/16
″
wall
thickness, which produces a 1/4
″
outside diameter. Since all
the port hose barbs are 1/8
″
, they require 1/8
″
inside diameter
hose. The intent is for use in air only and any questions about
hoses for your specific application should be directed to the
hose manufacturer. Four main types of hose are available:
temperatures,
material
Vinyl
Tygon
Urethane
Nylon
Vinylhose is inexpensive and is best in applications with
pressures under 50 psig and at room temperature. It is flexible
and durable and should not crack or deteriorate with age. This
type of hose should be used with a hose clamp such as those
listed later in this application note. Two brands of vinyl hose
are:
Hose
Wall
Thickness
Max. Press.
@ 70
°
F
(24
°
C)
Max.
Temp.
(
°
F)/(
°
C)
Clippard #3814–1
Herco Clear #0500–037
1/16
″
1/16
″
105
54
100/(38)
180/(82)
Tygontubing is slightly more expensive than vinyl, but it is
the most common brand, and it is also very flexible. It also is
recommended for use at room temperature and applications
below 50 psig. This tubing is also recommended for
applications where the hose may be removed and reattached
several times. This tubing should also be used with a hose
clamp.
Tubing
Wall
Thickness
Max. Press.
@ 73
°
F
(25
°
C)
Max. Temp.
(
°
F)/(
°
C)
Tygon B–44–3
1/16
″
62
165/(74)
Urethanetubing is the most expensive of the four types
described herein. It can be used at higher pressures (up to 100
psig) and temperatures up to 100
°
F (38
°
C). It is flexible,
although its flexibility is not as good as vinyl or Tygon.
Urethane tubing is very strong and it is not necessary to use
a hose clamp, although it is recommended.
Two brands of urethane hose are:
Hose
Wall
Thickness
Max. Press.
@ 70
°
F
(24
°
C)
Max.
Temp.
(
°
F)/(
°
C)
Clippard #3814–6
Herco Clear #0585–037
1/16
″
1/16
″
105
105
120/(49)
225/(107)
Nylontubing does not work well with Motorola’s sensors. It
is typically used in high pressure applications with metal
fittings (such as compressed air).
HOSE CLAMPS
Hose clamps should be employed for use with all hoses
listed above. They provide a strong connection with the sensor
which prevents the hose from working itself off, and also
reduces the chance of leakage. There are many types of hose
clamps that can be used with the ported sensors. Here are
some of the most common hose clamps used with hoses.
F
Freescale Semiconductor, Inc.
n
.