Laboratory

Semi-auto Biochemistry Analyzer: Features, Application, Maintenance

A semi-auto biochemistry analyzer is a machine that is necessary for doing blood tests such as glucose, urea, albumin, etc. It depends on the principle of filter photometry. The filter photometry is slightly different from spectrophotometry. You may find pre-set 50 parameters (approximately) in the machine. You can edit those programming’s as you like. Also, you can add about 100 new programs in the empty slots. The semi-auto biochemistry analyzer can store around 400 patient results. Here we will discuss the working principle, operation, and maintenance of the machine.

Besides that, we will also discuss the price and the list of authorized suppliers which deal with the machine within Kathmandu, Nepal.

Components of Semi-auto Biochemistry Analyzer

1. Color Filter

Different colored filters are present in the machine which signify different wavelengths. They can be 6 -7 in number. Also, you may have an extra slot (1-2) for adding extra filters if needed. The common wavelengths of filters include 340 nm, 405 nm, 500 nm, 546 nm, 578 nm, 620 nm, and 670 nm. Just see your literature on the reagent kit for setting this wavelength. If you do not have the given wavelength in the machine, choose the wavelength closest to the required one.

2. Light Source

The most common light source is the halogen (6V/10W) light, which has got a life span of about 3000 hours (theoretically).  In some models, the light source can also be a LED light.

3. Photo-detector

Photo-detector measures the absorbance (optical density) of the sample solution.

3. Flow Cell/Cuvette

It is for the storage of the sample, once it is fed into a semi-auto biochemistry analyzer. You will find 32 μl of quartz flowcell inside your machine. If your flowcell gets damaged, then you can use a cuvette to get the reading. In this case, the biochemistry analyzer acts like a colorimeter. But, as long as possible, use a flowcell for taking the measurements.

4. Temperature Controller

The most common temperature controller found in a semi-auto biochemistry analyzer is the peltier module. Also, in the machine, you can have the settings of temperature at 25°C, 30 °C, and 37 °C. If you need the room temperature, you can switch off the temperature setting.

5. Pumping System

A pump draws the sample from the sipping tube to the flowcell. Once the measurement is completed, it again draws the fluid out of the flowcell. The most common type of pump is the peristaltic pump. However,  you may even find a syringe pump for this purpose.

6. Incubator

You may find an inbuilt incubator for holding a few test tubes.

7. Thermal Printer

There is an inbuilt thermal printer at the top of the machine. In the setting menu, you can switch it to the OFF mode, if you do not need it. Else set it to ON mode. Once the printer paper finishes, replace it with a new one.

8. Fan

You can find a few brushless DC motors. They are necessary to maintain the set temperature and to cool the machine.

9. Display

It is generally  LCD type with or without a touch screen.

You can even use a membrane keyboard. Generally, a semi-auto biochemistry analyzer supports an external printer, mouse, and keyboard.

Semi-auto Biochemistry Analyzer Principle

Semi-auto Biochemistry Analyzer Principle
Semi-auto Biochemistry Analyzer Principle

A semi-auto biochemistry analyzer works on the principle of filter photometry. The halogen lamp radiates light in all directions. The radiated light then goes through a convex lens which converses the scattered light. After that, it passes through the sample present in the flowcell/cuvette. A part of light energy is absorbed by the sample. While the remaining light transmits. This transmitted light then goes through a color filter. The color filter passes the monochromatic light to the photodetector. Then, the photo-detector transfers the light signal to an electrical signal which becomes an input for the microprocessor.

The machine measures the absorbance of the light by the sample. Then it follows the calculation of the given parameter on the basis of the end-point, kinetic, or fixed time kinetics method.

Operation of a Biochemistry Analyzer

First of all, sip the distilled water once you have turned on the machine. When your machine is ready to run, add or edit all the programming of every parameter that you need. Set machine to the flowcell mode. Set either an internal or an external printer mode. Then set the date and time, and the name of the hospital or the lab, that you are working on. You may not need to alter the pump speed.

For every kind of method you follow, you need to feed distilled water initially. Then for the reagent blank, you also need to feed the reagent solution. And for the sample blank setting, you need to feed the sample blank solution.

For the two-point and end-point methods do the calibration with the help of a standard solution. Then save the factor that you get doing the calibration. Finally, cross-check it by feeding the standard solution as a sample solution.

Now feed the sample solution and get the result. Also, observe the graph on the LCD.

Parameters Measured by a Biochemistry Analyzer

Some of the major parameters that you can measure with the help of this machine are stated below.

Parameters Measured By Semi-auto Biochemistry Analyzer
Parameters Measured By Semi-auto Biochemistry Analyzer

Handling of Semi-auto Biochemistry Analyzer

  • If the space of the semi-auto biochemistry analyzer is about to be full, clear the data. Else, the machine may become slow to operate.
  • Always look for the condition of the tubing system. If there is leakage, replace it with the new one.
  • Never feed whole blood in the machine. Else, there will be clot formation in the tubes. This will block the path of the tubes and flowcell.
  • Make sure that the distilled water that you feed as a blank solution is not contaminated. Else, it will give you a fault reading.

1. Calibration

You need to do the calibration of the reagents in the following cases.

  • When you replace a reagent kit with a new one
  • When you replace a flowcell or light source

I suggest you, do calibration of every possible reagent at least once a week. But remember that, the more calibration you do, the better will be your result.

The system itself will have the features for different kinds of calibration such as pump calibration, sipping calibration, light intensity calibration, filter calibration, etc.

2. Absorbance (Optical Density)

Factors affecting the value of absorbance of the solution are as follows

  • Improper orientation of the flowcell in the machine.
  • If the machine is unable to sip in the solution, it will measure the absorbance of the air.
  • Replacement of the new light source or the natural aging of the existing light source will have variation in the intensity of the light. This will affect the absorbance of the solution.
  • If the light source is not working, then check the input voltage of the halogen lamp. If there is a proper supply voltage, then that means you need to replace the halogen lamp. On the other hand, if there is no voltage supply to the lamp, the problem may be on the mainboard.
  • The age of the photo-detector is inversely related to the value of absorbance. So, it is better to replace it after 3 yrs of use to get a better result.

3. Cleaning

Supplier of Semi-Auto Biochemistry Analyzer

There are many authorized dealers in Kathmandu, Nepal, which deals with clinical chemistry analyzer. Here is a list of a few of them, located within Kathmandu valley.

Suppliers Company Contact
Sunrise Surgical House Diatron, Rayto +977-1-4796078/4796069/4796080/4796081
Sudeep International Pvt. Ltd Human +977 9851275520
Menaka Enterprises Spinreact +977 1 4260674
Asian Global  Trading Pvt. Ltd Ocean Biomed +977 9851011132

Price of the Semi-auto Biochemistry Analyzer

The price of the machine can depend upon a number of factors such as features, manufacturing country, etc. So, I will not be able to give you the exact price of the machine. Also, the fluctuation in the foreign currency can alter the price of the machine.

As of this day, I assume that the price of semi-auto biochemistry analyzer can range from around 1.6 lakhs to 3 lakhs. However, to know about the authentic price, you may contact any one of the dealers stated above.

If you want to purchase a good, but a cheap machine, then I suggest you buy the Rayto product.

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