32
Calibration
3.2
Depth
NOTE:
This calibration option is available only if your bulkhead is equipped with a depth sensor
.
Depth is calculated from the pressure exerted by the water column minus atmospheric pressure. Factors influencing
depth measurement include barometric pressure, water density, and temperature. Calibration in the atmosphere
“zeros” the sensor with respect to the local barometric pressure.
YSI recommends calibrating depth at the location of measurement. A change in barometric pressure will result in a
zero shift unless the transducer is recalibrated to the new pressure.
If applicable, enter the depth offset to set the depth measurement to something other than zero. Enter the altitude and
latitude of your sampling location to increase the accuracy of your depth measurement.
Depth Calibration
1.
Make sure that the depth sensor is clean and dry in air, not im-
mersed in any solution. For best results, keep the bulkhead still
and in one position while calibrating.
2.
Push the
Cal
key, then select
Depth
. The
Calibration Value
is set
to 0.000 and should not be changed for air calibrations, even if
using an offset.
3.
Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration
(
Figure 47
).
If the depth offset is used, the depth measurement will be adjusted after
calibration.
Figure 47
Calibrate Depth
