MPXM2102AS datasheet(445/670 Pages) MOTOROLA

445 / 670 page

AN1513

3–299

Motorola Sensor Device Data

www.motorola.com/semiconductors

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)

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

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

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

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.

Tubing

Wall

Thickness

Max. Press.

@ 73

°F

(25

°C)

Max. Temp.

(

°F)/(°C)

Tygon B–44–3

1/16

″

165/(74)

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

Wall

Thickness

Max. Press.

@ 70

°F

(24

°C)

Max.

Temp.

(

°F)/(°C)

Clippard #3814–6

Herco Clear #0585–037

1/16

″

1/16

″

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.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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