Oxygen is one of the most important indicators of compost pile health. Oxygen can rapidly deplete if a pile is not aerated or does not have adequate porosity. The GMT Oxygen and Temperature, or OT Probe provides real time oxygen readings for your compost operation. The probe simultaneously measures temperature and oxygen at the tip of the probe. The air sample is pulled through the probe stem using a hand pump as shown in the photo below. The rocker switch on top of the case switches the LCD display between the oxygen or temperature readings.
The OT probe is easy to use. Here are the steps:
Use a notepad or our Windrow Manager App on the iPhone to record and graph the data.
The probe has several orifices that the air sample is drawn through. The orifices become clogged after several uses as the compost fines get pulled into the holes. The tip is removable and has a brush connected to both clean and filter the air. Simply remove the screw and pull the tip out and swivel the brush and your probe is ready to take more samples. Remember to bring a micro screw driver with you when you are sampling in the field.