Decagon Devices MAS-1 Kullanıcı Kılavuzu - Sayfa 4

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Decagon Devices MAS-1 Kullanıcı Kılavuzu

MAS-1 Soil Moisture Sensor

1. Introduction

Thank you for choosing the MAS-1 4-20 mA Soil Moisture

Sensor. These innovative sensors will enable you to monitor

soil moisture accurately and affordably with a standard 2-

wire, 4-20 mA analog interface for use with many data

acquisition and control systems. The MAS-1 can not be used

with the standard Decagon data loggers.

Specifications

Electrical

Interface: Standard 4-20 mA, 2-wire analog transmitter

Supply voltage: 10-32 VDC continuous

Output current: 4-20 mA

Overvoltage protection: Yes

Reverse polarity protection: Yes

Settling time: 4 seconds

Wiring: Red wire: (+) supply

Black wire: (-) output

Shield: Not connected

Measurement

Type: Volumetric water content (VWC)

Range: 0-50% VWC typical

Resolution: Depends on current measurement (data

acquisition) device

Accuracy:

± 4 % VWC with factory mineral soil calibration in a

typical mineral soil;

± 1-2% VWC with medium-specific calibration in most

porous medium