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The 29390 is the collimator for the CS725. The need for a collimator is typically dictated by the characteristics of the intended site. The presence of wooded vegetation and man-made structures and the expected SWE for a given site are all factors. Please consult the specifications for further information.
Read MoreThe following table is a guideline for determining if a site can be used without a collimator.
| Site Characteristics | Max. SWE < 300 mm |
Max. SWE 300 to 400 mm | Max. SWE > 400 mm |
| Very open site with no proximity to trees, buildings or tall vegetation within a 48 m (160 ft) radius. | Optional | Optional | Optional |
| No trees, buildings or tall vegetation within a 24 m (80 ft) radius. | Optional | Optional | Required |
| No trees, buildings or tall vegetation within a 12 m (40 ft) radius. | Optional | Required | Required |
| Site with minimum clearance radius of 6 m (20 ft) radius. | Required | Required | Required |