Campbell Scientific ST350 Strain Transducer for Structural Testing - Manual (Page 23)

Section 6. Calibration and Validation
Calibration is performed on each sensor prior to shipping from the
Manufacturer and a Calibration Certificate is shipped with each sensor. This
certificate certifies that the sensor is traceable to NIST Standards. If this sensor
is out of specification it can be sent to Campbell Scientific, Inc. for re-
calibration.
For quality control purposes, CSI recommends each transducer
be re-calibrated on an annual to bi-annual basis depending on the
usage and number of times the transducers have been installed on
a structure. NOTE
Based upon experience, the ST350 transducers should be re-calibrated after
every 15-25 installations depending on the care taken during the installation
process. The customer is responsible for any cost associated with the removal
of the transducer and shipping to CSI. If the part is under warranty, the
transducer will be re-calibrated at no further cost to the customer. If the part is
out of warranty, it will repair and calibrate according for a nominal fee
.
6-1