We have been using different types of sensors in our Gecko recorders to make all-in-one seismographs and accelerographs, but sometimes it is more convenient to have a sensor located in a different location to your recorder.
We are now offering split systems with a range of seismometers and accelerometers for connection to a Gecko recorder.
Our portable triaxial velocity range takes the sensors from inside the Gecko Blast, Gecko Tremor, and Gecko Prism models and places them in a range of external casings for remote sensing applications.
Check out our new sensor using Augmented Reality using your iPhone or iPad to see what it looks like in your room right now! This Ø136mm casing is used on a number of our new analogue sensor models. It features a central hole for single anchor mounting. Other devices can also see the earthquake sensor in 3D
Our triaxial acceleration range takes the sensors from inside the Gecko SMA variants and places them in a range of external casings. The best part is that all of our accelerometers are omnidirectional, meaning that they can be mounted at any angle without levelling. The choice between low cost accelerometers (LCA) and low frequency accelerometers (LFA) has never been easier.
-HR: What is High Range Output?
Our Gecko recorders have always had a standard input range of ±20V (40Vpp differential) for use with sensors from seismic sensor manufacturers. From 2021, Gecko can be internally switched to a ±30V (60Vpp) input range for use with our High Range (-HR) output sensors. All -HR sensors have a maximum output of ±30V (differential) and the included cable plug can be optionally fitted with up to 50m of 6-pair cable.
What are IEPE sensors?
The LFA-XR (and SMA-XR) use IEPE (Integrated Electronics Piezo-Electric) sensors, which require +25VDC and a constant 4mA current be fed across each channel wire pair, and a high pass filter to remove the offset bias voltage. This power supply is included as standard on the Gecko, but most other seismic recorders will require a signal conditioner to inject the required power. The sensors have a ±5V range output, so run your Gecko at a gain of x4 to maximise data resolution. If you only need a ±5g or ±2.5 range, use gains of x8 or x16 respectively.