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Sherwood Model 420Cs Flame Photometer
The Model 420Cs is the latest addition to our dual channel Flame Photometer range.
Based on the Model 420 Flame Photometer, the M420Cs adds greater flexibility and also benefits from recent improvements to stability (precision) available on all of the Sherwood 420 Series and 410 Series of Flame Photometers since January 2017.
Unique to the Sherwood range, the M420Cs Flame Photometer comes with a Caesium reference channel as an alternative to the existing Lithium reference channel traditionally used in Corning and then Sherwood instruments.
The Caesium Reference facility provides greater flexibility; allowing the operator to choose the internal reference element based on sample matrix considerations or to match established procedures developed with other instruments, e.g. the IL 943 Flame Photometer.
A primary practical example where Caesium is beneficial as an internal reference is the ability to measure Lithium in clinical samples with the increased precision afforded by use of an internal reference method.
The M420Cs Flame Photometer features:
- Operator selectable Caesium or Lithium internal reference.
- On board firmware with digital blanking, calibration and sampling routines greatly increase calibration speed and sample throughput.
- Simultaneous measurement of up to two of three available elements (Sodium, Potassium and/or Lithium).
- Linearised Sodium response over the expected clinical Sodium concentration range (following a 1 in 200 dilution).
- Improved precision with the internal reference facility (<0.5%CV for aqueous standard solutions).
- Robust safety features including flame detection and gas safety shut off with low air pressure.
- Two in-built digital displays for calibration and analysis data of each channel, analogue output connectors for use with chart recorders and some on-line analysis systems.
- A “no tools” maintenance approach allowing for easy access to and cleaning of the mixing chamber and burner assembly.
- RS232 for data output to a printer or PC when installed with the Regulated BlueNotes 420 Software package.
| Measurement Range | Linearity | ||
| Na Serum | 110.0 to 170.0 mmol/l | Na Serum | Na Serum within ± 2 mmol/l |
| Na Urine | 0.0 to 199.9 mmol/l | Na Urine | Na Urine within ± 4 mmol/l |
| K Serum | 0.00 to 10.00 mmol/l | K Serum | K Serum within ± 0.2 mmol/l |
| K Urine | 0.0 to 200.0 mmol/l | K Urine | K Urine within ± 2 mmol/l |
| Li Serum | 0.00 to 3.00 mmol/l | Li Serum | Li Serum within ± 0.2 mmol/l |
| Reproducibility | Dilution Factor | ||
| Na (140.0 mmol/l) with de-ionised water | < 0.5% CV (w/ Ref Facility) | Na Serum/Urine | 1 in 200 |
| K (5.00 mmol/l) ionised water | < 0.5% CV (w/ Ref Facility) | K Serum | 1 in 200 with de- |
| K (80.0 mmol/l) ionised water | < 0.5% CV (w/ Ref Facility) | K Urine | 1 in 200 with de- |
| Li (1.50 mmol/l) ionised water | < 0.5% CV (w/ Ref Facility) | Li Serum | 1 in 50 with de- |
The above is correct for use with Propane. Results obtained from 20 replicates of the same sample, aspirating sample for 20 seconds, then water for 10 seconds. To achieve the stated specification the flame must be alight for a minimum of 30 minutes, with diluent (containing Diluent Concentrate) being aspirated.
Accessories for Flame Photometer
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