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Model 420 Dual Channel Flame Photometer

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Keterangan Produk

The Model 420 has been developed with the objective of improving the productivity and analytical performance of the laboratory when measuring sodium and potassium.

The time taken to set up and calibrate the instrument is much reduced, this is achieved by the automatic ignition and optimisation of the flame conditions.

In dual mode both sodium and potassium results are obtained simultaneously halving the measuring time.

The analytical performance is improved by the use of a Lithium Internal Standard signal which reduces any fluctuation in flame conditions, drift, and dilution errors.

The readings on both channels are linear over the working range of the Model 420.

There are several monitoring and control functions included in the software driving the Model 420, eg. measurements can only be made after Blanking and Calibration.

The Model 420 can operate in continuous or peak mode. In peak mode the Model 420 automatically detects a stable reading for transmission to a printer or computer. In Continuous Mode the display is real time and can be sent to the analogue output with or without ratioing to the Internal Standard Reference, or printed to the printer or a computer.

The date of analysis is printed at each calibration and the time is printed for each sample, QC and repeat samples are identified on the printout.

Sample dilution and presentation to the Model 420 of Clinical samples can be made automatically by the Sherwood Model 805 Diluter. No predilution of urine samples required for potassium.


Measured Ranges

Clinical Sample Element   Industrial
Serum Na 100.0-199.9 mmol/l 0-199.9
  K 1.00-9.99 mmol/l 0-199.9
  Li 1.00-5.00 mmol/l 1.0-199.0
Urine Na 100.0-199.9 mmol/1  
  K 40.0-120.0 mmol/l  
Linearity Na & K 2% over Full Range  
  Li 10% over Full Range  

Reproducibility: less than or equal to 1% CV 20 replicate samples (Above specification using butane or propane and after 30 mins instrument warm up)

Dilution Ratios

Clinical     ndustrial
Serum and Urine Na & K 1:200 Final concentration
using blank solution Li 1:50 Na < 40 ppm
      K & Li < 20 ppm

Minimal sample volume

Minimal Dilution 10 Microlitre
Auto Dilution with Model 805 Diluter 50 Microlitres

Flame Photometer Application Methods

The following applications methods will enable the user to determine alkali and alkaline earth metal concentrations in a wide variety of sample media. It is envisaged that, from the information given in this section, further applications methods will be appended with relative ease. The procedures detailed in this section are as follows:

Code Title
F-001G Determination of alkalis in cement
F-002F Determination of calcium in beer
F-003M Calcium in biological fluids
F-004F Estimation of calcium in milk
F-007A Determination of potassium in fertilizers
F-008A Determination of potassium in plant material
F-009A Determination of available potassium in soils
F-011G Sodium and potassium in silicates, minerals and ores
F-012G Determination of sodium in raw pine oil
F-013A Determination of exchangeable sodium in soils
F-015G The flame photometric determination of sulphate
F-016G The determination of sodium in fuel oil
F-017G The determination of potassium in mixtures containing plant derived resins
F-018G The determination of lithium in greases
F-019G The simple flame photometric determination of barium
F-020G The simple flame photometric determination of calcium
F-021F The determination of calcium in fruit juice
F-022G The determination of potassium in glass
F-023G The determination of sodium in glass
F-024A Sodium in straw by flame photometry
F-025F Determination of sodium and potassium in fruit juice
F-027F The determination of calcium in biscuits

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