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4
The Diver measures a pressure of 1,170 cmH
2
O and the Baro-Diver measures a pressure of 1,030
cmH
2
O. Substituting these values into equation (1), results in a water column of 140 cm above the
Diver: WC = 140 cm.
Substituting the values of the manual measurement and the water column in equation (4) results in
the following cable length: CL = 120 + 140 = 260 cm.
The water level in relation to MSL can now be easily calculated using equation (2): WL = 150 260 +
140 = 30 cm above MSL.
Measuring Temperature
All Divers measure the groundwater temperature. This can, for example, provide information about
groundwater flows.
The temperature is measured using a semiconductor sensor. This sensor not only measures the
temperature, but also uses the value of the temperature at the same time to compensate the pressure
sensor and electronics for the effects of temperature to ensure the best possible performance.
Diver Models
The Diver models described in this manual are from the DI8xx Series: the TD-Diver and the Baro-Diver.
Both models measure absolute pressure and temperature. The summary below describes the two
models.
TD-Diver
This Diver is manufactured using a stainless steel (316 L) casing with a
22 mm diameter. The TD-Diver is capable of storing a maximum of
72,000 measurements (date/time, pressure and temperature) in its
working memory and 72,000 measurements in its backup memory.
The TD-Diver samples pressure and temperature at fixed length
intervals and stores these values in fixed length or continuous memory.
The TD-Diver is available in the following pressure ranges: 10 m, 20 m,
50 m and 100 m.
Baro-Diver
The Baro-Diver is manufactured using a stainless steel (316 L) casing
with a 22 mm diameter. The Baro-Diver is capable of storing a maximum
of 72,000 measurements (date/time, pressure and temperature) in its
working memory and 72,000 measurements in its backup memory.
The Baro-Diver measures atmospheric pressure and is used to
compensate for the variations in atmospheric pressure measured by the
other Divers. The Baro-Diver can also be used for measuring shallow
water levels up to 1 meter.
The Baro-Diver samples pressure and temperature at fixed length
intervals and stores these values in fixed length or continuous memory.
