Liquid chromatograph and column oven for use therein

摘要

A liquid leakage decision unit includes a leak sensor value storage part that stores a leak sensor value that is based on the intensity of a signal received from a gas sensor; a difference calculation part that, when the signal is received from the gas sensor, calculates, as a difference value, a value obtained by subtracting a previous leak sensor value stored in the leak sensor value storage part from a current leak sensor value; and a liquid leakage detection part that compares the difference value calculated by the difference calculation part with a preset threshold, thereby to detect liquid leakage in the column oven.

主权项

1. A column oven for adjusting a temperature of a separation column of a liquid chromatograph, the column oven comprising:
a gas sensor configured to detect vaporized gas of a solvent contained in a mobile phase, which outputs a signal having an intensity dependent on a value detected; and a liquid leakage decision unit configured to receive the signal output from the gas sensor at regular time intervals to determine whether liquid leakage of the solvent is present or not, the liquid leakage decision unit comprising,
a leak sensor value storage part configured to store a leak sensor value that is based on the intensity of the signal received from the gas sensor,a difference calculation part configured to, when the signal is received from the gas sensor, identify the leak sensor value that is based on the intensity of the signal as a current leak sensor value, identify a leak sensor value that is based on an intensity of a signal previously received from the gas sensor as a previous leak sensor value, and calculate, as a difference value, a value obtained by subtracting the previous leak sensor value stored in the leak sensor value storage part from the current leak sensor value, anda liquid leakage detection part configured to detect liquid leakage in the column oven by comparing the difference value calculated by the difference calculation part with a preset threshold,wherein the threshold is set to a value greater than an amount of change of the leak sensor value due to a temporal change in a sensitivity of the gas sensor.