It is recommended to use the builder pattern and simply chain the sensor setup and keep those settings constant after the initial setup. Example:

_arsemiCore.AddSensor(new MAX30102Sensor("Heartrate"))
  .SetInterval(50)
  .AddEvent(_heartrushEventName, rb => EventCondition.BelowThreshold(rb, 50))
  .AddFilter(FilterAliases.ButterworthHighPassFilter(100, 10), "Highpass");

• You should store the event names in variables to check for this name when handling EventReceived.
• Event conditions should not involve complex math because they are checked every time a new sample arrives.