In-Situ Aqua TROLL 100 and 200 Operators Manual - Manual (Page 63)

Page 63 Aqua TROLL Operator’s Manual
Pressure Sensor Calibration
Factory Recalibration
Pressure sensor accuracy can be adversely affected by improper
care and handling, lightning strikes and similar surges, exceeding
operating temperature and pressure limits, physical damage
or abuse, as well as normal drift in the device’s electronic
components. Aside from damage to the sensor, the need for
factory recalibration is dependent upon the amount of drift a
customer is willing to tolerate. Factory calibration every 12-18
months is recommended. Contact In-Situ Customer Service for
information on the factory maintenance and calibration plan.
Field Recalibration
The following procedure may be used, with caution, to set
to zero the offset of a vented pressure sensor to correct for
electronic drift. The drifted offset is visible when the sensor is in
air and reading other than zero.
It is recommended you do not set to zero the offset if it is
outside the specified accuracy of your pressure sensor, as shown
in the table below. If the reading in air deviates from zero by
more than the amounts shown, you may want to consider a
factory recalibration.
Sensor Accuracy Acceptable Offset
range (0°C to +50°C) from zero
5 psi ± 0.1% FS ± 0.005 psi
15 psi ± 0.1% FS ± 0.015 psi
30 psi ± 0.1% FS ± 0.03 psi
100 psi ± 0.1% FS ± 0.10 psi
300 psi ± 0.1% FS ± 0.30 psi
500 psi ± 0.1% FS ± 0.50 psi
TIP: In Level
mode, any zero
pressure offset is
corrected automatically. The
field recalibration procedure
is not necessary except when
measuring pressure.
Section 6: Pressure & Level