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Our seismographs do not require periodic calibrations in that they do not have any adjustable parameters. With that being said, we do recommend that they are checked for performance and routine maintenance to include intensive analog tests of the acquisition circuitry. A reasonable interval would be around every 5 years for normal usage. During these tests we verify that the seismograph analog performance meets our specifications by using a seismic test system. This system incorporates a standard reference oscillator and precision resistor networks to inject known signals into the seismograph. We then use algorithms in our software to calculate the response and performance of the analog circuits. This "performance test" is run whenever we receive an instrument in for repair or evaluation. Some of our customers do prefer to have the performance of their instrument checked on a periodic basis especially if they are required by their clients, for example the NRC. We offer these nontraceable recertification’s to include a calibration certificate and test results for a Fee of $300. If you would like us to perform performance verifications and a system evaluation please reserve an RMA and obtain shipping instructions.

The cesium used in our magnetometers is the non-radioactive elemental metal, isotope Cs 133. We employ approximately 120 to 240 micrograms of cesium metal in the sensor divided between the lamp and absorption cell. These are small glass ampules, each containing a volume of 1/32 to 1/16 of a cubic millimeter of cesium. If either or both the lamp and cell should break the cesium will instantaneously react with the air and moisture in the air to become Cs2O and/or CsOH. Both compounds are caustic but the quantity is so small that it is of no health concern. Finally, the lamp and the cell ampules are contained in a G10 housing that is then contained inside a sealed PVC housing. If the sensor should cease working due to a broken lamp and/or cell, it is not field repairable. Return the sensor to Geometrics for repair, replacement and/or disposal.