User Manual
Reliability Demonstration Report
MaxBotix
®
Inc.
Document Release: 05/12/2010, pg. 7 of 10
10
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MaxBotix, MaxSonar, XL & WR are trademarks of MaxBotix Inc.
v1.1b • 07/2009 • Copyright 2005-2010
Email:
info@maxbotix.com
Web:
www.maxbotix.com
4.2 PVC Temperature Considerations
For the WR-MaxSonar products the PVC housing is subject to the physical limitations of
the plastic exterior. In order to prevent cold flow the sensors should only see limited
operation at temperatures of 85°C for limited periods of time (30 minutes or less). At
65°C PVC will have a modulus (or stiffness) of 1800 Mpa (maintains rugged, sturdy,
PVC properties), but at 85°C PVC will have a modulus (or stiffness) of 560 Mpa (might
allow for cold flow movement).
Stiffness of PVC
1
10
100
1000
10000
40 60 80 100 120
Temperature (C)
Modulus/Stiffness (MPa)