The following is a detailed description of the usage details of the parallel concentrator, which integrates the standardized processes and precautions of multiple devices for laboratory operation reference:

1、 Preparation work

1. Environmental and equipment inspection

-Ensure that the instrument is placed on a level, well ventilated table, away from heat sources and flammable materials, and the power supply is reliably grounded.

-Check if the oil level of the vacuum pump is normal, if the circulating water of the condenser is connected and the flow rate is stable (if applicable), and if the vacuum pipeline is not damaged.

-Clean the sample rack and sealing cover to ensure there are no residual solvents or impurities.

2. Sample preparation

-Use heat-resistant and corrosion-resistant glass bottles or specialized concentration tubes, with a liquid capacity not exceeding 2/3 of the container capacity, to avoid boiling and overflowing during concentration.

-If precise volume determination is required (such as concentration to 1mL), activate the volume sensor or mark the scale line in advance.

2、 Parameter settings and startup

1. Parameter setting

-Temperature: usually ≤ 95 ℃ (heated in a water bath), adjusted according to the characteristics of the solvent (such as volatile solvents can be appropriately reduced).

-Vacuum degree: generally set to -70kPa to -90kPa to avoid excessive boiling of the solvent caused by too low a pressure or affecting efficiency due to too high a pressure.

-Time: Set according to solvent volume and concentration, ranging from 30 minutes to 6 hours. It is recommended to conduct a short-term test before adjusting.

2. Startup sequence

-Turn on the circulating water (if necessary), vacuum pump, and main power supply in sequence, and finally input parameters through the touch screen or control panel.

-When injecting water, it is necessary to first place the sample bottle to avoid the risk of water overflowing into the empty tank and subsequent operations.

3、 Sample loading and sealing

1. Loading requirements

-Insert the sample bottle into the corresponding hole position to ensure the balance of each channel (multi-channel equipment should be symmetrically placed to avoid centrifugal deviation).

-Gently press the sealing cover plate and tighten the fixing nut or buckle to check if there is any air leakage in the vacuum pipeline connection.

2. Prevention of cross contamination

-The independent sealing design can prevent cross contamination between samples.

-Use explosion-proof boiling filter or vibration function to reduce the risk of boiling 210.

4、 Concentration process control

1. Start the process

-First, turn on the vacuum pump to reach the target vacuum level, and then activate the heating and shaking functions (if supported by the equipment) to avoid premature boiling of the solvent.

-During the heating process, if the instrument has an automatic water replenishment function, it is necessary to ensure a stable water level to maintain a constant temperature.

2. Process monitoring

-Monitor the sample status through the transparent observation window. If there is excessive boiling or foam, reduce the heating temperature or the shaking speed.

-Multi channel equipment needs to regularly check the consistency of vacuum degree in each channel to prevent uneven concentration of individual samples.

3. Terminal judgment

-When the sample approaches the target volume, rely on sensor prompts or visual judgment to stop the corresponding channel to avoid solvent evaporation and sample loss.

-If using the automatic constant volume function, the sensor sensitivity needs to be calibrated in advance.

5、 End operation and cleaning

1. Shutdown steps

-First, turn off the heating and shaking functions, then slowly release the vacuum to atmospheric pressure, and finally turn off the vacuum pump and power.

-It is forbidden to forcefully open the lid in a vacuum state to prevent sample suction or glass bottle breakage.

2. Sample and equipment processing

-Take out the sample bottle, transfer the concentrated solution, and clean the container promptly to avoid solvent residue corrosion.

-Drain the water bath tank, wipe the condenser and sample rack, and regularly replace the vacuum pump oil (it is recommended to check once a month).

6、 Precautions and common questions

1. Safety regulations

-Wear goggles and gloves during operation, and handle highly corrosive solvents (such as trichloroethylene) in a fume hood.

-Avoid loose clothing or long hair near the equipment to prevent entanglement with rotating parts.

2. Exception handling

-Insufficient vacuum degree: Check whether the sealing cover and pipeline are leaking, or whether the vacuum pump needs maintenance.

-Sample drying: Shorten heating time or lower temperature, some equipment has anti dry burning protection function.

-Low condensation efficiency: Ensure that the cooling water temperature is sufficiently low (dry ice can be added).

3. Maintenance suggestions

-Clean the sealing ring and vacuum pipeline after each use to prevent residual solvent crystallization from blocking.

-Cover with a dust cover when not in use for a long time, and regularly power on to maintain component activity.