Freescale Semiconductor, Inc. Order this document by AN1513/D SEMICONDUCTOR APPLICATION NOTE ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 "! " ! " ! " Prepared by: Brian Pickard Sensor Products Division Semiconductor Products Sector ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 Freescale Semiconductor, Inc... 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 For More Information On This Product, Go to: www.freescale.com 1 Freescale Semiconductor, Inc. AN1513 ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 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) ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 Freescale Semiconductor, Inc... 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. For More Information On This Product, Go to: www.freescale.com Motorola Sensor Device Data Freescale Semiconductor, Inc. AN1513 ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 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. ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 Freescale Semiconductor, Inc... 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. For More Information On This Product, Go to: www.freescale.com 3 Freescale Semiconductor, Inc. ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 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 ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 Freescale Semiconductor, Inc... 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 For More Information On This Product, Go to: www.freescale.com Motorola Sensor Device Data Freescale Semiconductor, Inc. AN1513 ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 Freescale Semiconductor, Inc... ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Motorola Sensor Device Data For More Information On This Product, Go to: www.freescale.com 5 Freescale Semiconductor, Inc. ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 Freescale Semiconductor, Inc... AN1513 Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 303–675–2140 or 1–800–441–2447 JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 81–3–3521–8315 Mfax: [email protected] – TOUCHTONE 602–244–6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, – US & Canada ONLY 1–800–774–1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 INTERNET: http://motorola.com/sps 6 ◊For More Information On This Product, Go to: www.freescale.com AN1513/D Motorola Sensor Device Data