Patent ID: 9546988
Date: 2017-01-17
CPC Classifications: G01N

Claim:
1. A pulsed ion multifunctional detector for both high performance liquid chromatograph and ion chromatograph, including a casing with a power supply socket, the casing is provided with a sample solution inlet, a sample solution outlet, a control panel with an operation keyboard and a liquid crystal display, and a detection signal output interface, in the casing is further provided a detection electromechanical member, characterized in that: the detection electromechanical member includes: a central controller connected with the operation keyboard and the liquid crystal display of the control panel; a detection cell being in communication with the sample solution inlet and the sample solution outlet; a first electrode and a second electrode provided in the detection cell, the first electrode is connected with the central controller for ionizing solution in the detection cell, and generating ion current of mobile phase before entering sample solution into the detection cell and generating ion current of sample as entering sample solution into the detection cell; a preposed subtracting module including a first operational amplifier, whose two input terminals are respectively connected with the second electrode and the central controller, for amplifying and subtracting ion current of mobile phase before entering sample solution into the detection cell, and causing the voltage of the first output terminal of the first operational amplifier to be zero, and amplifying ion current of sample as entering sample solution into the detection cell to form voltage signal of sample; a polarity transformation module including a second operational amplifier, the first output terminal is connected with a fixed head of a relay, the central controller is used to control the relay for switching the first output terminal to be connected with a second in-phase input terminal or a second inverting input terminal of the second operational amplifier, such that the voltage of the second output terminal of the second operational amplifier is a positive voltage; a noise processing module including a third operational amplifier, the third operational amplifier is connected with the central controller and the second output terminal for eliminating dynamic noise and drift of the instrument; an output amplifier module including a fourth operational amplifier, and being connected with the central controller and a third output terminal of the third operational amplifier for automatically setting zero before entering sample solution into the detection cell, amplifying the voltage signal of sample and outputting the amplified voltage signal of sample through the detection signal output interface.