Campbell CS455 Manual descargar pdf (Pagina 19)

CS450/CS455 Pressure Transducer

Only SDI-12 instruction aM!, aM7!, and aM8! output the results obtained

when using the multiplier and offset. The offset and multiplier is only applied

to the pressure/level value, not to the temperature.

3.2.2.2 Sample Number

The extended SDI-12 command used to configure sample number is

"aXCONFIG2=nnn!", where nnn is the number of samples that will be

measured to obtain the final output value, which is an average of the samples

taken. This value only applies to the aM8! command. The integration time is a

result of the number of samples selected. This value can be derived by adding

2 seconds to the number of samples. For example, if nnn = 50, then 50 samples

would be averaged. The integration time for this process is 50 plus 2, or 52

seconds.

4. Installation

The CS450/CS455 is designed for water level measurements. Typical

applications include agricultural water level/flow, water wells, lakes, streams

and tanks. If the device is to be installed in a liquid other than water or in

contaminated water, check the compatibility of the wetted material. The CS455

should be used in harsh water applications, including salt water.

4.1 Vent Tubes

A vent tube incorporated in the cable vents the sensor diaphragm to the

atmosphere. This eliminates the need to compensate for changes in barometric

pressure.

To prevent water vapor from entering the inner cavity of the sensor, the vent

tube opening should terminate inside a desiccated enclosure or a desiccant

tube. Moisture inside the vent tube can cause erroneous data and damage to

the sensor.

4.2 Dislodging Bubbles

While submersing the sensor, air bubbles may become trapped between the

pressure plate and the water surface, causing small offset errors until the

bubbles dissolve. Dislodge these bubbles by gently shaking the CS450/CS455

while it is under water.

Do not hit the sensor against the well casing or other solid

surface while dislodging the bubbles, this could damage

the sensor.

CAUTION

4.3 Water Depth

For water level measurements, the CS450/CS455 must be installed below the

water at a fixed depth. This depth should be chosen so that the water pressure

will never exceed the sensor’s pressure range. Otherwise, the output reading

will not be correct, and the sensor can be damaged if pressure is excessive (2X

full scale).

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Campbell CS455 Manual Pagina 19