Depth Measurement (Map 2100 Only); Taking Depth Measurements; Differential Depth Measurement - palintest Macro 900 Operation Manual

Macro 900 Operation Manual

7. Depth Measurement (MAP 2100 only)

Depth is measured in the MAP 2100 by a pressure sensor mounted inside the
body of the probe.
Depth is calculated by subtracting the barometric pressure being measured in
the Macro 900 Meter from the water pressure being measured in the MAP 2100.
The pressure differential, once corrected for temperature and salinity (water
density), is directly proportional to depth.
The depth measurement system uses the EC sensor to detect when the probe
has been placed in water. All the time the probe is measuring an EC of zero,
the depth will read zero. As soon as an EC value is detected, the meter will
start to calculate depth. For this reason, it is important to ensure the
Probe is connected to the Meter and switched on prior to submerging
the probe in water.

7.1. Taking Depth Measurements

Connect the Probe to the Meter and switch on prior to submerging the probe in
water. Select the Baro/Depth screen as illustrated below. The depth should be
reading zero.
If the depth is not reading zero (this is possible if the probe is wet and a low EC
reading is registering), press the OK key. You will be asked to confirm by
pressing OK again.
Slowly lower the probe into the water. As soon as the depth value starts to
register, you can lower the probe more quickly.

7.2. Differential Depth Measurement

If you want to measure changes in depth, it may be more convenient to zero
the depth measurement once the probe has been submerged.
To do this, press the OK key whilst displaying depth, then confirm. The unit will
now read positive or negative changes in depth from the current depth (zero
datum).
If the values are positive, the water level has increased from the zero datum. If
the values are negative, the water level has decreased.
Using the Automatic Data Logging feature detailed in the following section, it is
possible to monitor water levels over a period of time for later recall.
© 2013 Palintest Ltd.
BARO:1013mb
DEPTH:00.00m
Hit [OK] to zero
GPS:3D Pos
www.palintest.com
V3
Page 20 of 147