3
Power up/down
The soil moisture sensor reader is powered on and off with the
ON/OFF button. The meter will initially display the battery
level and firmware version. It will then transition to sensor
reading mode. The initial mode displayed will be the mode
that was active when the meter was powered off.
Sensor Reader Modes
Press the SET button to advance the meter to the desired
mode.
The available mode settings are listed below. The first four
modes are data measurement modes. The fifth mode is the
meter’s raw electronic (A/D) reading. The reader converts
the raw electronic reading to measurement units using internal
calibration constants. The sixth mode is for calibrating the
EC circuit of the SMEC300 or the soil moisture reading for an
SM100 (see pp. 6-7)
1. Spectrum Standard: For the SM100 and SMEC300, the
volumetric water content for a mineral soil will be dis-
played on the first line. For the SMEC300, the EC will be
displayed on the second line.
2. Spectrum Soilless: Similar to the Spectrum Standard mode
except the VWC displayed is for soilless media. Sphag-
num peat moss was used to develop the calibration con-
stants for this mode.
Basic Operation
Sample SM100
LCD screen
25.8 %WC
STANDARD
12.4 %WC
01.24 mS
Sample SMEC300
LCD screen
