Excl. VAT: £6,500.00 Incl. Tax: £7,800.00

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Product Code:
  • FH305-20
Flame photometer, Sherwood Model 420 Clinical, dual channel emission, with Na, K, and Li filters, fuel and air connections, 1000ppm standard solutions and with lineariser, for 198-264V 50/60Hz a.c., requires a gas regulator and air compressor of the correct type.


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For use in applications examining pharmaceutical and biochemical samples, clinical and biological fluids, industrial processes and environmental testing.

  • Dual channel emission flame photometer with Na, K and Li filters and additionally offering simultaneous Na and K results, built-in lineariser for clinical samples, Li internal standard referencing for enhanced accuracy, microprocessor control and monitoring of measurements, continuous or peak mode operation, and built-in RS232 port for result output.
  • Digital readout with moveable decimal point       
  • Automatic air regulation
  • Auto-ignition of flame                                        
  • Gas cut-off safety feature
  • Integral ‘fail-safe’ flame monitoring                     
  • Recorder output
Model      420 Clinical
Sensitivity             Minimum concentrations producing a display reading of 100 scale units: Na: 0.5ppm. K: 0.5ppm, Li: 2ppm
Detection limts       Na, K <0.02ppm at 2 x standard deviation
Specificity          <0.5% to reading from interferent of Na, K, Li equal to the concentration of element under test
Drift %     <1
Reproducibility    %  <0.5 (Peak ref. mode)
Display channels    2 (LED)
Result display    Auto peak
Result storage   Yes
Outputs   Adjustable analogue and RS232
Dimensions  mm    390 x 345 x 510
Weight kg 10
Services required    
Electrical   198-264V 50/60Hz
Air   Moisture and oil free 6 litres/minute at 1kg/cm2
Gas   High grade propane, butane or propane/butane mixture. Fuel should be free from heavy hydrocarbon deposits and regulated to 30 p.s.i. at the cylinder.


With Na, K and Li filters, fuel and air connection, 1000ppm standard solutions for Na, K and Li, software and instructions. Requires but does not include an air compressor of the correct type and gas regulator. For 198-264V 50/60Hz single phase supplies.

Industrial version also available - details on request.