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1. There are bubbles in the pipeline from the mobile phase to the pump. How to eliminate it?
The method of elimination is as follows: firstly screw down the plastic flow connection connected to the pump, fill the deionized water with the ear wash ball, inject from the flow pipe connected to the pump section, and eliminate the air bubbles in the flow pipe. Then raise the mobile phase bottle (usually a deionized water bottle) and connect the flow connection to the pump. Start the pump, open the pump exhaust valve selector button, and remove the air bubbles in the pump. Generally, the effluent is relatively uniform, and then tighten the pump exhaust valve. (Note: the entire flow path is disconnected from the column during this operation)
Second, what are the phenomena of the pump check valve blockage? How to operate?
In the case of a pump check valve, if the microorganisms are stuck, the pump will not be sucked up. The most obvious phenomenon is that no liquid flows out or the solution flows out slowly when there is no liquid in the waste pipe or when the pump is started.
If the check valve is blocked, we need to clean it. The cleaning method is as follows:
First unscrew the flow joint and joint 1 first, then unscrew the left joint 2, and take the two check valves into the 50ml beaker with tweezers. (When removing, pay attention to the direction of the arrow on the check valve. The direction must be installed. Same as this), adding a small amount of absolute ethanol just over the two check valves. Then put it in an ultrasonic cleaner for 30-60 minutes. After cleaning the check valve with water, install it in the reverse direction of the disassembly direction. (Note: Do not tighten the connector too tightly to avoid damage to the screw pattern)
Third, the suppressor current has no display, how to judge the problem? How to operate?
a, first understand the structure of the suppressor, the structure of the suppressor is shown in Figure 3:
b. Detection of the suppressor circuit: Use a screwdriver to unscrew the four fixing screws at the four corners of the suppressor box, and you can see the suppressor diagram shown in Figure 3. Remove the electrode lines on both sides of the suppressor. Note that the colors of the electrode lines on the two sides are inconsistent (normally the red line is connected to the right and the left side is gray or black). Then connect the two electrode lines with the analog resistor (100 ohms) in the accessory kit. Turn clockwise on and adjust the current knob on the control panel to observe the change in the current display on the touch screen. If the change rule is adjustable from 45-100 or 105 mA, the suppressor circuit is operating normally, and the reason that the suppressor current display is abnormal is caused by poor contact when the two electrode wires are connected to the suppressor. If there is no change, it will always show 0, indicating that the suppressor circuit has been broken down, and the circuit needs to be replaced or maintained.
c. Flanging and connection of the square flow connector on the suppressor: the connection of the joint needs to be flanged when the suppressor is re-entered from the outlet of the conductivity cell.
d. Maintenance of the connection of the suppressor joint and maintenance of the leakage problem: There are mainly three joints on the suppressor, one is connected to the column outlet (PEEK taper joint), and the other two are connected to the conductivity tank inlet (PEEK taper joint) and The outlet (four-way flow joint), the position of the joint is marked on the suppressor, and be careful not to make mistakes when connecting. In addition, the connection of the joints should be loose and should not be leaked. Connecting the end of the column to the end of the column is too tight, which will increase the system pressure. If the square flow connection at the outlet of the conductivity cell is too tight, the solution will not flow through the conductivity cell, and even more, the ion exchange membrane of the suppressor will be broken and the suppressor will be damaged.
Ion chromatograph common problems and simple maintenance
In general, the most common faults in the operation of the ion chromatograph are as follows. It is necessary for the chemical laboratory technician to learn some simple maintenance and operation of the ion chromatograph. (The maintenance of this column is for reference only. If the accessories in actual maintenance differ from this, you can refer to the following operations)