Amatek biogas flow meters

We have 6 of these.
Calibration procedure: Based on temperature. Send back to the Amatek factory for calibration. They maintain a water bath as a constant temperature and see if the reading is accurate.
This flow meter is a information heap/hot-wire anemometer.
AKA Amatek "Mass Flow Sensors"

Similar to this model: Echotel 961 962 single- and dual-point ultrasonic level switches
Check with Chris Luss for precise model / serial number.
The calibration certificates correlate with the serial number for each sensor, and must be included in the report to government/Shelby County Health Department.