ARCHIVED 2005 AN1513 Mounting Techniques and Plumbing Options of the MPX Series Pressure Sensors

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SEMICONDUCTOR APPLICATION NOTE
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"! "
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" Prepared by: Brian Pickard
Sensor Products Division
Semiconductor Products Sector
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INTRODUCTION
Motorola offers a wide variety of ported, pressure sensing
devices which incorporate a hose barb and mounting tabs.
They were designed to give the widest range of design
flexibility. The hose barbs are 1/8″ (≈3 mm) diameter and the
tabs have #6 mounting holes. These sizes are very common
and should make installation relatively simple. More
importantly, and often overlooked, are the techniques used in
mounting and adapting the ported pressure sensors. This
application note provides some recommendations on types of
fasteners for mounting, how to use them with Motorola
sensors, and identifies some suppliers. This document also
recommends a variety of hoses, hose clamps, and their
respective suppliers.
This information applies to all Motorola MPX pressure
sensors with ported packages, which includes the packages
shown in Figure 1.
A review of recommended mounting hardware, mounting
torque, hose applications, and hose clamps is also provided
for reference.
MOUNTING HARDWARE
Mounting hardware is an integral part of package design.
Different applications will call for different types of hardware.
When choosing mounting hardware, there are three important
factors:
• permanent versus removable
• application
• cost
The purpose of mounting hardware is not only to secure the
sensor in place, but also to remove the stresses from the
sensor leads. In addition, these stresses can be high if the
hose is not properly secured to the sensor port. Screws, rivets,
push–pins, and clips are a few types of hardware that can be
used. Refer to Figure 2.
Single Side Port
Differential Port
Axial Port
Stovepipe Port
Screw
Figure 1. MPX Pressure Sensors with
Ported Packages
Rivet
Push–Pin
Figure 2. Mounting Hardware
REV 1
Motorola Sensor Device Data
 Motorola, Inc. 1997
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NOTES:
–T–
C
A
E
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
–Q–
U
DIM
A
B
C
D
E
F
G
J
K
N
P
Q
R
S
U
V
POSITIVE
PRESSURE
N
V
B
R
PORT #2
VACUUM
PIN 1
–P–
0.25 (0.010)
T Q
M
M
1
2
3
4
S
K
F
SEATING
PLANE
MILLIMETERS
MIN
MAX
27.94
30.48
18.80
19.30
16.13
16.51
0.41
0.50
4.06
4.57
1.22
1.32
2.54 BSC
0.36
0.40
5.84 REF
1.78
2.03
3.81
4.06
3.81
4.06
11.30
11.68
17.40
18.16
21.33
21.84
4.69
4.95
G
D 4 PL
0.13 (0.005)
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J
INCHES
MIN
MAX
1.100
1.200
0.740
0.760
0.635
0.650
0.016
0.020
0.160
0.180
0.048
0.052
0.100 BSC
0.014
0.016
0.230 REF
0.070
0.080
0.150
0.160
0.150
0.160
0.445
0.460
0.685
0.715
0.840
0.860
0.185
0.195
M
T P
Q
S
S
–A–
–T–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5, 1982.
2. CONTROLLING DIMENSION: INCH.
U
L
R
H
N
PORT #1
POSITIVE
PRESSURE
–Q–
B
1 2
3 4
PIN 1
K
–P–
0.25 (0.010)
J
M
T Q
S
S
F
G
D 4 PL
0.13 (0.005)
C
M
T S
S
Q
DIM
A
B
C
D
F
G
H
J
K
L
N
P
Q
R
S
U
INCHES
MIN
MAX
1.140
1.180
0.685
0.751
0.305
0.321
0.016
0.020
0.048
0.052
0.100 BSC
0.182
0.194
0.014
0.016
0.685
0.715
0.290
0.300
0.420
0.440
0.153
0.158
0.153
0.158
0.231
0.250
0.230 REF
0.910 BSC
MILLIMETERS
MIN
MAX
28.95
29.97
17.39
18.16
7.74
8.15
0.40
0.50
1.21
1.32
2.54 BSC
4.62
4.92
0.35
0.40
17.39
18.16
7.34
7.62
10.67
11.12
3.88
4.01
3.88
4.01
5.86
6.35
5.84 REF
23.11 BSC
S
Figure 3. Case Outline Drawings
Top: Case 371D–02, Issue B
Bottom: Case 350–03, Issue H
To mount any of the devices except Case 371–05/06 and
867E) to a flat surface such as a circuit board, the spacing and
diameter for the mounting holes should be made according to
Figure 3.
Mounting Screws
Mounting screws are recommended for making a very
secure, yet removable connection. The screws can be either
metal or nylon, depending on the application. The holes are
0.155″ diameter which fits a #6 machine screw. The screw can
be threaded directly into the base mounting surface or go
through the base and use a flat washer and nut (on a circuit
board) to secure to the device.
MOUNTING TORQUE
The torque specifications are very important. The sensor
package should not be over tightened because it can crack,
causing the sensor to leak. The recommended torque
specification for the sensor packages are as follows:
2
Port Style
Single side port:
port side down
port side up
Differential port (dual port)
Axial side port
Torque Range
3 – 4 in – lb
6 – 7 in – lb
9 – 10 in – lb
9 – 10 in – lb
The torque range is based on installation at room
temperature. Since the sensor thermoplastic material has a
higher TCE (temperature coefficient of expansion) than
common metals, the torque will increase as temperature
increases. Therefore, if the device will be subjected to very low
temperatures, the torque may need to be increased slightly. If
a precision torque wrench is not available, these torques all
work out to be roughly 1/2 of a turn past “finger tight” (contact)
at room temperature.
Tightening beyond these recommendations may damage
the package, or affect the performance of the device.
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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.
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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
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)
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)
Tygon tubing 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.
Grip Range = a + b
Wall
Thickness
Max. Press.
@ 73°F
(25°C)
Max. Temp.
(°F)/(°C)
1/16″
62
165/(74)
a
b
Tubing
Tygon B–44–3
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.
Urethane tubing 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 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 temperatures, material
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:
• Vinyl
• Tygon
• Urethane
• Nylon
Vinyl hose 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
Motorola Sensor Device Data
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)
Nylon tubing 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.
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Crimp–on Clamp
Nylon Snap
Spring Wire
Screw–on
The two clamps most recommended by Motorola are the
crimp–on clamp and the screw–on, Clippard reusable clamp.
The crimp–on type clamp is offered from both Ryan Herco
(#0929–007) and Clippard (#5000–2). Once crimped in place,
it provides a very secure hold, but it is not easily removed and
is not reusable. The Clippard, reusable hose clamp is a brass,
self–threading clamp, which provides an equally strong grip as
the crimp–on type just described. The drawback is the
reusable clamp is considerably more expensive. The nylon
snap is also reusable, however the size options do not match
the necessary outside diameter. The spring wire clamp,
common in the automotive industry, and known for its very low
cost and ease of use, also has a size matching problem.
Custom fit spring wire clamps may provide some cost savings
in particular applications.
Figure 4. Hose Clamps
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AN1513
SUPPLIER LIST
Hoses
Spring Wire Clamps
Bolts
Norton–Performance Plastics
Worldwide Headquarters
150 Dey Road, Wayne, NJ 07470–4599 USA
(201) 596–4700
Telex: 710–988–5834
USA
P.O. Box 3660, Akron, OH 44309–3660
USA
(216) 798–9240
FAX: (216) 798–0358
RotorClip, Inc.
187 Davidson Avenue
Somerset, NJ 08875–0461
1–800–631–5857 Ext. 255
Quality Screw and Nut Company
1331 Jarvis Avenue
Elk Grove Village, IL 60007
(312) 593–1600
Rivets and Push–Pins
Crimp–on and Nylon Clamps
ITW FasTex
195 Algonquin Road
Des Plaines, IL 60016
(708) 299–2222
FAX: (708) 390–8727
Ryan Herco Products Corporation
P.O. Box 588
Burbank, CA 91503
1–800–423–2589
FAX: (818) 842–4488
Clippard Instrument Laboratory, Inc.
7390 Colerain Rd.
Cincinnati, Ohio 45239, USA
(513) 521–4261
FAX: (513) 521–4464
Ryan Herco Products Corporation
P.O. Box 588
Burbank, CA 91503
1–800–423–2589
FAX: (818) 842–4488
4
Crimp–on and Screw–on Clamps
Clippard Instrument Laboratory, Inc.
7390 Colerain Rd.
Cincinnati, Ohio 45239, USA
(513) 521–4261
FAX: (513) 521–4464
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