Abstract: A bolus for monitoring the parameters of an animal. The bolus will sense selective parameters and will send signals representative of those parameters to a receiver. The bolus includes sensors for sensing a number of parameters such as temperature, pH and movement. The power of the signal inside the animal is greater than that outside the animal since the signal is attenuated by the structure of the animal.

Abstract: A bolus for monitoring the parameters of an animal. The bolus will sense selective parameters and will send signals representative of those parameters to a receiver. The bolus includes sensors for sensing a number of parameters such as temperature, pH and movement. The power of the signal inside the animal is greater than that outside the animal since the signal is attenuated by the structure of the animal.

Abstract: A modular control is provided for sensing characteristics of a fluid and controlling the dispensing of additives into said fluid. The control is contained in a box-like housing having an openable wall which is sealable to a remainder of said housing in a water-tight manner. A plurality of printed circuit boards can be mounted in an interior of said housing. A control circuit is carried on at least one printed circuit board mounted in the housing including a microprocessor controller. At least one probe is provided for immersion in the fluid to detect a characteristic of the fluid. At least one output device is provided for dispensing an additive into the fluid. A signal processing circuit is carried on a printed circuit board mounted in the housing for processing a signal received from the probe. An output control circuit is carried on a printed circuit board mounted in the housing for controlling the output device. A display is mounted on one of the housing walls.