What’s inside a Lennartz 3D-Lite

“PLEASE, BY ALL MEANS RESIST THE TEMPTATION OF OPENING THE SENSOR!

As we have stated previously, there are (very literally!) no user serviceable parts inside, and you will only make things worse. Once the sensor has been opened, the average user is unable to reseal the sensor properly.”

That is from page 23 of the Lennartz 3d-Lite manual. I don’t know about you but for me that is like waving a red cape in front of a Murcia bull. What could possibly be inside, what wonders beyond the average person lie in waiting? We just had to find out.

So here it goes: What’s Inside a Lennartz 3D-Lite?:

Here is Dave Nelson (not an average person) about to open the Lennartz.  Just two little bolts.

Here is Dave Nelson (not an average person) about to open the Lennartz. Just two little bolts.


Two screws and the lid is off!  A very nice brushed stainless housing.  Nice WIMA caps.

Two screws and the lid is off! A very nice brushed stainless housing. Nice WIMA caps.


The special washer (normal bolt) that Lennartz says that below average people will mess up. (See manual page 23) In all honesty it is a special washer but if you are really concerned, don't worry because you can get a similar one at http://www.mcmaster.com/#standard-sealing-washers/=p8x75a or several other places.  We treated them nicely and reused them.

The special washer (normal bolt) that Lennartz says that below average people will mess up. In all honesty it is a special washer but if you are really concerned, don’t worry because you can get a similar one at http://www.mcmaster.com/#standard-sealing-washers/=p8x75a or several other places. We treated them nicely and reused them.


Stainless outer tube off, and the circuit board removed. You can see the flat steel plate that secures the geophones.

Stainless outer tube off, and the circuit board removed. You can see the flat steel plate that secures the geophones.


And here it all is, the geophones off the base and all the components laid out.  To read the manual for the 3Dlite, click here.

And here it all is, the geophones off the base and all the components laid out. To read the manual for the 3Dlite, click Manual_LENNARTZ_SISMOMETROS.


For many years, the Lennartz 3d-Lite has been the gold standard in electronically extending the period of geophones. You can see the patent here: https://register.dpma.de/DPMAregister/pat/PatSchrifteneinsicht?docId=DE3307575A1. Yes it is in German and it is expired. Dave Nelson (the fellow in the first photo) has designed a circuit for OSOP based on the Lippmann patent that is the basis of our Sixaola and Darien sensors.

So there you have it, that’s what is inside a Lennartz 3D-Lite.

Angel

Leave a Reply

Your email address will not be published. Required fields are marked *

*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>