Microliter flowmeter | One liter equals several milliliters, and the basic conversion relationship between milliliters and liters

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1. Common faults of Henghe chromatographic analyzer GC8000, how to solve negative values

The negative values of Henghe chromatographic analyzer GC8000 may be related to injection volume calibration, column temperature, flow rate, instrument status or data processing, and need to be specifically investigated and resolved.

1. Reason for injection volume issue: Excessive injection volume can cause column overload, ineffective sample separation, and some components may be incorrectly identified as negative peaks;

; If the injection volume is too small, it may cause signal fluctuations or baseline drift due to insufficient detection sensitivity, indirectly leading to negative values. Solution: Adjust the injection volume according to the sample concentration and column capacity to ensure it is within the recommended range of the instrument (usually in microliters). The optimal injection volume can be determined through gradient testing, and the peak shape can be observed for symmetry and no tailing.

2. Reasons for unstable column temperature: Fluctuations in column temperature can alter the retention time of the sample in the chromatographic column, leading to abnormal peak shape (such as peak broadening or splitting), which in turn affects the integration results and may result in negative values.

. Solution: Check if the heating element, temperature sensor, and control circuit of the column temperature box are normal. Regularly calibrate the column temperature to ensure that its deviation from the set value is ≤ 0.5 ℃. If the sealing performance of the column box is poor, the sealing ring needs to be replaced or repaired.

III. Reasons for unstable flow rate: If the carrier gas flow rate

is too fast, it will shorten the sample retention time and reduce the separation degree;

; If the flow rate is too slow, the analysis time may be prolonged, which may cause peak overlap or baseline drift, both of which may lead to negative values. Solution: Use a flow meter to calibrate the carrier gas flow rate, ensuring it remains stable at the set value (such as within the range of 1-50mL/min). Check for air leaks in the gas path connections, replace aging or clogged chromatography columns, and regularly maintain the flow rate controller.

Fourth, instrument malfunction or problem. Possible fault points: chromatographic column aging or contamination: decreased column efficiency leading to weakened separation ability, requiring cleaning or replacement of the chromatographic column.

. Abnormal detector sensitivity: If the FID detector nozzle is blocked or the ECD detector is contaminated, the detector components need to be cleaned or replaced. Injector malfunction: The injection needle is blocked or the injection valve is leaking, and the injector components need to be cleaned or replaced. Solution: Follow the instrument pin bridge manual to gradually troubleshoot hardware issues, and contact professional maintenance personnel if necessary.

Fifth, causes of data processing system problems: data acquisition card failure, improper setting of software integration parameters (such as low baseline deduction threshold), or software crashes, which may lead to negative values.

. Solution: Restart the data processing system and check if the integration parameters (such as peak width and slope threshold) are reasonable. If the problem persists, contact technical support to update software or repair hardware

Microliter flowmeter | One liter equals several milliliters, and the basic conversion relationship between milliliters and liters

1. Common faults of Henghe chromatographic analyzer GC8000, how to solve negative values

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