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This is a modified ProLink SDI-12 radio that reduces data transmitted in networks that use a "tipping bucket" rain gauge at a remote site. This was developed to reduce file sizes for satellite data retrieval. Normally, when a datalogger polls a pulse-count-to-SDI-12 converter, it will record a data point for each poll, even when the value is zero. This creates very large data files. The RainRadio independently polls the pulse-count converter during a lull when the logger is quiet. If the pulse-count is non-zero, then the RainRadio sends pulses to the datalogger over a dedicated wire. Each pulse is recorded in the logger as a timestamped event. If there are no pulses, there are no events to record. This solves the problem. This feature works in parallel with the usual SDI-12 radio functionality.  Users manual

This controller triggers automated water samples, based on criteria for rainfall and water level. A flask sampler has a magazine of flasks that should be filled during heavy rain events.  However, it is impractical for a technician to be present during these events to manually trigger the samples. The ProSampler automates flask sampling by "eavesdropping" on rain gauge pulses and SDI-12 water level data. First, the ProSampler compares rainfall to two rolling thresholds, e.g. 10mm per hour or 25mm per day.  After a rainfall event is detected, the ProSampler listens to the SDI-12 bus to determine water level.  When a specified level has been reached, the ProSampler triggers the first flask. Subsequent samples are triggered on incremental changes in stage, discharge, or at fixed time intervals. Discharge is calculated by a programmable two-part rating curve.  A pulse is sent to the datalogger when each flask is triggered, generating a timestamp in the data. Triggering stops when stage falls below a "reset" level, or when flasks are exhausted.  Users manual,  Rating curve calculator

This device allows the use of compressed air to add oxygen to a lake. A source of compressed air is connected to bubblers at the bottom of the lake bed. The ProControl uses data from a dissolved oxygen sensor to servo a bank of mass-flow controllers, and the resulting air bubbles maintain the optimal oxygen level.  This allows artificial lakes to stay oxygenated without chemicals, saving money and protecting the ecosystem.