• CASM-201 單點式土壤溫濕度偵測器，耗電量低，多種輸出可選
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單點式土壤溫濕度偵測器

Model：CASM-201
‧溫度範圍：-20°C~70°C(僅限數位輸出款型)
‧輸出：0~5mA、4-20mA、SDI12、RS485(擇一)
‧垂直安裝時，可測量6英寸（15厘米）土壤層上的平均體積水分含量。
‧當水平安裝時，可用於測量特定土壤深度的水分。
‧尺寸 :19.6 x 20 x 0.56 cm
‧標準電纜：5m
‧低電耗

CASM-201是一款單點式土壤溫濕度偵測器，扁平輕巧式設計，可將土壤破壞降至最低，當採用採用垂直安裝時，傳感器可量測6英寸的土壤層上的平均體積水含量，水平安裝時，則可測量特定土壤深度的水分，提供0-5mA、4-20mA、SDI12與RS485多種輸出，可搭配後端延伸應用。

測量原理

TDT (時域傳輸)

測量範圍

濕度：0~100% of VMC

溫度：-20~70℃(僅限數位輸出款型)

精度

濕度：±2.0% *

溫度：±0.5℃(僅限數位輸出款型)

輸出訊號

類比：0-5 mA, 4-20 mA

數位：SDI-12, RS-485

接線

裸線（可選 4 pin，IP66/IP68 級環境連接器）

熱機時間

類比：< 100 ms

數位：< 1 sec

輸入電壓

6 to 14 VDC max. 18 VDC

當前消耗

0-5 mA: 18 mA (nominal), 25mA (max)

4-20 mA: 30mA (nominal), 50 mA (max)

Digital: < 0.1 mA (quiescent), 15-35 mA (active)

操作溫度

-20°C to +70°C

儲存溫度

-40°C to 85°C

尺寸

19.6 x 20 x 0.56 cm

重量

38 g per m

標準電纜

5m
   

* 8% to 42% VMC, in controlled laboratory conditions; factory calibrated for most agricultural soils. In field applications, accuracy may slightly decrease due to the inevitable heterogeneity of soil texture, soil compaction, moisture and fluctuation in soil temperature. The accuracy may also decrease in di¢cult soil conditions (higher clay and salinity content). In normal conditions, CASM sensors will maintain their accuracy from permanent wilting through field capacity in sandy loam through clay soils with less than 60% clay particles. Under moderately saline conditions. CASM sensors will maintain their accuracy up to 6 ds/m.