Rain funnel and downspout
Bird droppings and other soiling of the domed sensor surface will cause serious errors in pyranometer readings and may affect rain gauge measurements. Check the sensor regularly to make sure it is clean and check data often to identify possible problems. Isopropyl (rubbing) alcohol and a Q-tip or cotton swab work well for cleaning the sensor area. Microfiber bags work well, too. Do not use an abrasive cloth on the sensor surface, as it will scratch.
See the full cleaning instructions for detailed procedure.
NOTE: Installing bird spikes to your ATMOS 41 is strongly recommended to prevent birds from sitting on the edge of the rain gauge and minimize buildup in the rain funnel. Pliers are required for installation.
The pyranometer is factory calibrated. The sensor-specific calibration value can be found on the interior of the rain funnel. METER recommends swapping and calibrating the ATMOS 41 pyranometer with new sensor modules at least once every two years.
When swapping the ATMOS 41 rain funnel and pyranometer, you’ll need to enter the new pyranometer calibration value (Cal Factor) into ZENTRA Utility for the EM60G/ZL6 data logger. See instructions for replacing the ATMOS 41 rain funnel and pyranometer and contact Customer Support for replacement parts.
RH sensor replacement/calibration
ATMOS 41 barometric pressure and vapor pressure/RH sensors and their respective calibrations are housed on a module that sits behind the circular Teflon membrane in the same housing as the sonic transducers (see Figure 8 in manual).
This module should be removed and replaced in the field at least every two years or annually for some applications with a new calibrated sensor module. Please contact Customer Support for new sensor modules/replacement parts and consult the instructions for swapping ATMOS 41 daughterboard.
Instrument leveling and positioning
Keeping the ATMOS 41 all-in-one weather station level to the ground is critical for rain gauge, anemometer, and pyranometer accuracy. Check horizontal and vertical leveling using the bubble level, located underneath the ATMOS 41, and/or using X-Y data. The ATMOS must be within ±2 ° of dead level (0, 0) in both the X and Y directions to accurately measure rainfall and solar radiation. You can also use a PROCHECK display to level the weather station. See manual for recommendations and installation instructions.
The accuracy of wind direction measurements depends on the orientation of the ATMOS 41. Ensure the N engraved end is still pointing true North using a compass.
PHYTOS 31 Leaf Wetness Sensor maintenance
Over time, the accumulation of dust and bird droppings can cause the dry output to rise on the PHYTOS 31 Leaf Wetness Sensor. The sensor should be cleaned periodically using a cloth moistened with only water. The sensor should also be cleaned when elevated dry output is detected.
Adding UV protectant will extend the service life of the PHYTOS 31 and is highly recommended. The PHYTOS 31 leaf wetness sensor is designed to withstand typical outdoor radiation and precipitation loads for greater than two years. However, application of UV protectant is strongly recommended and is essential if using the PHYTOS 31 in areas with unusually high radiation loads.
The PHYTOS 31 comes pretreated with UV protectant, but METER recommends reapplying McNett UV Tech every 45 days. McNett is the only tested and approved UV blocking system for the PHYTOS 31. To apply McNett UV Tech:
1. Wipe sensor clean using water and a clean, soft cloth.
2. Spray soft cloth with UV Tech spray.
3. Rub both sides of the sensor surface with a wet cloth to apply protectant.
Exposure to freezing temperatures
Snow accumulation and freezing temperatures can affect the performance of various sensors, including the following.
TEROS 32 Tensiometer
Tensiometers are filled with water, therefore susceptible to freezing. Remove from service any tensiometers that might be exposed to freezing temperatures. Refilling the sensor may not be possible under these conditions.
And remember, do not touch the ceramic cup. Skin oil, sweat, or soap residues will influence the ceramic hydrophilic performance.
HYDROS 21 Water-Level Monitoring, Electrical Conductivity, Temperature and Depth Sensor
While freezing is not generally a problem in deep underground well installations, it might be an issue in surface water wells and underground installations above the frost depth. If water freezes in the HYDROS 21 sensor pressure transducer cavity, then ice formation will ruin the pressure transducer. If the sensor is in water, it must not be allowed to experience temperatures below freezing, 0 °C or 32 °F. Exposing the HYDROS 21 sensor to freezing temperatures with water in the pressure transducer cavity voids the sensor warranty.
PS-1 Irrigation Pressure Switch
Because the PS-1 Irrigation Pressure Switch is plumbed into your irrigation line, possible freeze damage can occur. Please ensure water has been cleared and you take the proper precautions in winterizing your irrigation system.
ATMOS 41 pyranometer and anemometer
The accumulation of snow, ice or frost may adversely affect the accuracy of the ATMOS 41’s solar radiation measurement and can dampen anemometer measurements. See app note for more information on ATMOS 41 performance in below-freezing and snowy conditions.
The EM60G/ZL6 will automatically receive firmware updates when connected to the internet. Firmware updates can be part of a regular maintenance schedule, but are generally not required unless you need support for a new sensor type. You should always be running the latest version of software when possible.
Keep software like ZENTRA Utility and ZENTRA Utility Mobile updated on your various devices (laptop, phone, etc). Sensor firmware updates are not part of a regular maintenance schedule and should not be done unless contacted by METER Group to do so.
Software Updates: Check for the newest available version of the ZENTRA Utility. If a newer version is available, a prompt will appear to install the update. The computer must be connected to the internet for this feature to work. ZENTRA Utility checks for newer versions of the program each time it launches. It will download these updates in the background automatically.
Logger Firmware Updates: Check for the newest version of EM60G/ZL6 firmware from METER. If a newer version is available, ZENTRA Utility downloads the firmware in the background.
When ZENTRA Utility connects to an EM60G/ZL6, it compares the firmware on the logger with the latest version available. If the EM60G/ZL6 firmware is out of date, ZENTRA Utility will prompt to start a firmware update for the logger. ZENTRA Utility maintains a cache of logger firmware to allow field firmware updates without a connection to the internet.
The billing cycle for device subscriptions is January 1 through December 31. Renewing your ZENTRA Cloud subscription in December ensures continuous cloud monitoring into the new year.
Notification icons for expired or soon to be expired subscriptions are visible throughout the software in ZENTRA Cloud. You will have 15 days after the expiration of a subscription to continue viewing data for that device, after which new data will not be visible for that device if not renewed.