Campbell CS725, Instruction Manual

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CS725 Snow Water Equivalent Sensor
5
sufficient counts for the expected SWE. It is also important to reduce the
effects of background K and Tl sources that will adversely affect the SWE
measurement.
Do not mount the CS725 in close proximity to buildings, wood material or
trees. Wood material can contain potassium, which may be a source of gamma
radiation that will interfere with the measurements. Potassium sources above
the snow will emit gamma radiation that is not attenuated by the snow pack.
It is reasonable to have small amounts of wood material within the 6 m
clearance radius. However, be aware that reducing the amount of material near
the CS725 or increasing the distance will reduce its influence on the readings.
6.2 Mounting
Please contact a Campbell Scientific representative if you are
unsure of suitable mounting structures or methods for the CS725
• Always ensure that the collimator is secured to the structure with the long
safety cable.
• Always install the collimator after the main CS725 body is mounted and
secured to the structure.
Mount the CS725 above the snow pack. It is recommended to mount the
CS725 approximately 3 m above ground or above the expected maximum
snow height. If the CS725 is submersed in the snow, it may be damaged by
water ingress. The CS725 can also be mounted lower than 3 m; however, this
will reduce the effective measurement area.
FIGURE 6—1. CS725 with collimator and safety cable
It is possible to rotate the CS725 Main Body with respect to the mounting
plates. Figure 6-2 shows one of the four fasteners that need to be loosened in
order to rotate the main body.
Note