Apogee Instruments SI-121 Owner's Manual - Page 5
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SENSOR MODELS
The four FOV options and associated model numbers are shown below:
SI-131
Model
SI-100 Series
SI-400 Series
SI-121
Output
Voltage
SDI-12
Sensor model number and serial number are located
on a label near the pigtail leads on the sensor cable. If
you need the manufacturing date of your sensor,
please contact Apogee Instruments with the serial
number of your sensor.
SI-111
SI-1H1