D
OCUMENT
301900,
R
EVISION
D
E
PI
S
ENSOR
U
SER
G
UIDE
33
4.
Maintenance
Recommended Maintenance
The EpiSensor is designed for many years of unattended use, but we
recommend that you perform the following checks a minimum of once a
year. If the EpiSensor is connected to an Altus recorder equipped with a
modem, this maintenance check can be performed remotely and more
frequently. See the Altus recorder manual for more details.
Adjust the Accelerometers
If the offset of the EpiSensor modules measures more than the suggested
limit shown in Table 1, they should be adjusted. Refer to
Chapter 2
for
instructions on adjusting the zero offset.
Complete a Functional Test
Kinemetrics recommends that you perform a functional test on the
accelerometer at each service visit to check that the unit is operational and
to keep as a baseline record for future visits. Refer to
Chapter 3
for
instructions on performing the functional test. If the unit is connected to an
Altus or other Kinemetrics recorder, refer to the recorder’s manual for
instructions on performing the functional test. Refer to
Chapter 6
if the unit
is connected to a non-Kinemetrics data acquisition system.
Calibration
The EpiSensor is very stable and maintains its calibration in the field for
many years. A functional test will provide a good indication of whether the
sensor is working properly. A further quick check of the calibration can be
performed in the field by simply tilting the 90
0
and –90
0
in each
axis. By tilting the sensor, an acceleration of
"
1g can be measured.
Kinemetrics can supply a tilt table and training in order to perform more
accurate calibrations/verifications in the field. Kinemetrics can also provide
on-site or factory calibrations traceable to national standards.
