Abstract: This feature of the present invention comprises a method, apparatus, and system for detecting and conditioning an ionization current signal. In one embodiment of the invention, an analog signal conditioning circuit detects and processes the ionization signal. The analog signal conditioning circuit uses a signal isolator having an input and an output, an amplifier having a first and a second input, and a first and a second output, wherein the first input operably connected to the signal isolator output, a peak detector having a first and a second input, and an output, wherein the first input is operably connected to the first output of the amplifier, and an integrator having a first and a second input, and an output, wherein the first input is operably connected to the second output of the amplifier.

Abstract: In a first embodiment, the present invention is a method of detecting an open secondary winding, including the steps of enabling an integrator, resetting the integrator, detecting an ionization current, integrating the ionization current over a spark window, comparing the integrated ionization current with a threshold, and setting an open secondary flag if the integrated ionization current is below the threshold. In another preferred embodiment, the invention is a method of detecting an open secondary winding by measuring spark duration including the steps of comparing an ionization signal with a first threshold, measuring the spark duration when the ionization signal is greater than the first threshold, comparing said spark duration with a second threshold, and setting an open secondary flag.

Abstract: A secondary tubing containment system (10) is provided for a discharge tube (18) of a chemical metering pump (14) in a chemical addition system (12). One end of the discharge tube (18) is engaged in a fitting (20) on the metering pump (14), and the other end of the discharge tube (18) is engaged in a fitting (22). The containment system (10) includes a pair of coupling nuts (30, 32), a connector in the form of a Tee (34), two cylindrical tubes (36, 38), a pair of unions (40, 42), and a drain tube (44). The inside and outside diameters of the tubes (36, 38) are sized to allow the tube (38) to be slid or telescoped into the tube (36) to allow the length of the containment system (10) to be adjusted. The union (40) is configured to sealingly engage the tube (38) along the length of the tube (38) to accommodate the adjustment.