2
USING APOGEE OXYGEN SENSORS WITH ZENTRA SYSTEM
1. INTRODUCTION
Apogee Instruments SO-411 Soil Response Thermistor Reference Oxygen Sensor is a gaseous
oxygen sensor designed primarily for use in soil applications.
Apogee SO-411 sensors purchased from METER come preconfigured by METER to work
seamlessly with METER ZENTRA series data loggers. The information in this document
explains how to integrate Apogee SO-411 sensors into the ZENTRA system and attach
an auxiliary power supply for the internal heaters. Details of how the ZENTRA system
handles the data are also included. Please read this document carefully in its entirety
before going out to the field. For more information on Apogee oxygen sensors, please
review the
on the
(apogeeinstruments.com/
so-411-sdi-12-soil-response-thermistor-reference-oxygen-sensor).
2. INSTALLATION
Follow the steps listed in
to install Apogee oxygen sensors in the field.
Table 1 Installation
Tools Needed
Apogee SO-411 Oxygen Sensor (preconfigured by METER, included in order)
Apogee AO-001 Diffusion Head (included in order)
Shovel or Auger (if application requires sensor burial)
METER ZENTRA series data logger ZL6 or EM60
METER ZSC Bluetooth
®
Sensor Interface (optional)
METER ZENTRA software ZENTRA Utility, ZENTRA Utility Mobile, or
ZENTRA Cloud
Preparation
Conduct System Check
METER strongly recommends setting up and testing the system (sensors and
data loggers) in the lab or office.
Inspect and verify all components are intact.
Visit the data logger product page for the most up-to-date software and firmware.
Verify all sensors are functional and read within expected ranges.
Install AO-001 Diffusion Head
Slide the included o-ring onto the male threads of the SO-411 sensor.
Screw the AO-001 diffusion head onto the SO-411 sensor.
NOTE: This is important to keep the Teflon
®
filter from becoming plugged and thereby
reducing oxygen diffusion to the sensing mechanism.
Calibrate Sensor for Atmospheric Pressure Dependence
To accurately measure oxygen concentration in relative units (%), Apogee
oxygen sensors must be calibrated in ambient air at the elevation that they will
be deployed (
).
