News

2017-10 Different views on the use of O-ring grease

by Beheerder on 09 January 2018 18:40
At Datawell we have always actively discouraged the use of grease for O-rings. This discouragement stems from the fear that grease on the O- ring could attract dirt and hairs causing inaccurate sealing of the groove.
New insights however, have resulted in a changed policy regarding this matter. We have come to realise that even if small amounts of dirt should end up on the O-ring, water tight sealing is not an issue. Also, users of the Waverider handle it carefully as should be done with an expensive instrument. Instruments are opened, serviced and closed in a clean environment minimalising the chance of loose dirt ending up on the O-ring. Many of our customers have used grease for many years without complications. There are however several issues that should be kept in mind when considering using O-ring grease. We strongly advise against the use of grease containing graphite or copper. These materials can cause corrosion. Also the use of grease based on silicones should not be used since the silicones in the grease have the tendency to harden.



Author
Beheerder

Many Waveriders we supplied have been equipped with a Superstar GPS receiver. Recently it has come to our attention that the Superstar generates a faulty date in the logger files. The problem can be explained by an unexpected “GPS week rollover”. The internal date obtained from the GPS satellite system is incorrect. Typically the date is set to the year 2096. To convert the incorrect data we are currently developing a software tool. The only solution to this problem however is to replace the Superstar GPS receiver. The Superstar position module must be replaced with the µBlox GPS receiver (DWR-MKIII and WR-SG). The µBlox GPS receiver was introduced in the beginning of 2012.