Sherwood Scientific Flame Photometer Range
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Flame Photometer Range

The estimation of the Alkali metals by Flame Photometry (e.g. Sodium determination in Foods, Sodium and Potassium determination in Cement), is by far the most important application of Flame Photometers in routine chemical analysis. For this widespread requirement, low temperature Flame Photometers still provide the most reliable and convenient procedure available. Flame Photometry also has considerable appeal in the clinical chemistry field as it provides a rapid and reliable means of estimating Sodium, Potassium and Lithium in body fluids. The methodologies of such analyses are well known and established.
However the estimation of the alkali and alkaline earth metals is commonly required in a sample matrix which does not lend itself to simple and direct analysis involving only a dilution step, e.g. sodium in fuel oil. Sherwood Scientific Ltd has a A guide to Flame Photometer Analysis which aims to guide the user towards making successful determinations in a wide variety of sample media.

Sherwood Scientific Ltd has the widest range of instruments and accessories available from any one manufacturer of Flame Photometers. From simple single channel to standalone or software driven multichannel instruments, which can be supplied as fully automated packages to best suit the end user's application and budget . With our modular approach, initial capital purchase of a Sherwood Scientific Ltd Flame Photometer can be the first step towards a fully automated package.

Model 360 Flame Photometer

M360 Flame Photometer

Five element (Na, K, Li, Ca, Ba)
Single channel Flame Photometer

Ergonomic design with front loading,
unobstructed sample work area,
with removable tray for easy cleaning

With ease of use resulting from auto ignition and flame optimisation.
Peak picker for presenting unambiguous readings and selected filter indicator

Safety features including fail safe flame detection and shut off

High sensitivity with fine manual control of air, and stable flame design

And ease of maintenance and storage
Separate pneumatic and electronic pods
Small footprint (20 x 30cm)
Easy to remove and clean filter stick

Model 360 Flame Photometer full details

Model 410 Single Channel Classic, Industrial and Clinical Flame Photometer Range

Model 410 Classic Flame Photometer All three Model 410 Flame Photometers come with a preloaded filter stick which houses a maximum of three element filters. The filter stick is easily removed and replaced within the chimney housing (no tools required) and as such it is a relatively simple operation to introduce alternative element specific filters. Filters available for use with all the Model 410's include:

Sodium, Potassium, Lithium, Calcium, Barium, Strontium, Rubidium and Cesium; the most extensive range available from any Flame Photometer manufacturer.

The Model 410 Classic Flame Photometer (475 41 200) comes with Sodium, Potassium and Calcium filters. The "Classic" design is the one developed by Corning some 30 years ago. We still manufacture this highly successful unit due to popular demand and have expanded its utility by introduction of the:

Models 410 Industrial and 410 Clinical Flame Photometers; both come with a Digital Interface fitted as standard. The Digital Interface allows connection to a serial printer or computer for result collection. Digital Interface Lineariser Module

The Model 410 Industrial Flame Photometer (475 41 201)

Flame Photometry is the technique of choice for the measurement of Sodium, Potassium and Calcium in all sample types in: Mineral Extraction, Oil Industry, Paper Industry, Pharmaceuticals, Soil Analysis, Utilities, Food & Beverage, Chemical Manufacture and Fertilisers. The Model 410 Industrial Flame Photometer with digital output, for printer or PC connection, also has Sodium linearisation capability to allow higher concentrations of Sodium (to 40 ppm) to be directly measured using a single point calibration. That facility can be switched on or off according to the operator's preference or protocol for Sodium determinations. The Model 410 Industrial Flame Photometer has Sodium, Potassium and Calcium specific filters and NIST traceable 1000 ppm standard concentrates for each of those analytes (6 x 100 ml).

Model 410 Clinical Flame Photometer (475 41 301)

For clinical samples, Flame Photometry is the most sensitive and robust method for the determination of Sodium, Potassium and Lithium. The Model 410 Clinical Flame Photometer is delivered with Na, K and Li filters pre-fitted and an appropriate multi-element calibrator in mmol/l. (1 x 100ml). The Clinical instrument is also fitted with a Digital Interface and Sodium linearisation facility allowing direct, straight line, calibration of clinically significant concentrations of Sodium, as well as Potassium and Lithium, following suitable dilution. (Sherwood's Model 805 Continuous Flow Diluter, used together with the Model 410 Clinical Flame Photometer, gives nominal sample dilution ratios of 1:200 and 1:50. It has been designed to give consistent dilution of calibrator and samples to the Flame Photometer).

Digital Model 410 Flame Photometer with BlueNotes, Dilutor and Autosampler Both Model 410 Industrial and Model 410 Clinical Flame Photometers can be further enhanced by the use of the Model 410 BlueNotessoftware (410 66 000) and Model 860 Autosampler (860 00 009). Fully integrated and automated systems are possible, even for the Model 410 Classic Flame Photometer via our Update and Automate Modules and packages.

Model 420 and 425 Dual Channel Flame Photometer Range

Model 420 Flame Photometer The Model 420 Clinical Flame Photometer was developed from the Single Channel Model 410 Flame Photometer, with the objective of improving productivity and analytical performance, when measuring Sodium and Potassium. It is available in Clinical (475 42 000) or Industrial (475 42 100) format with appropriate NIST traceable calibration solution concentrates.

The biggest improvement is Dual Channel operation, allowing both Sodium and Potassium to be calibrated, measured and displayed simultaneously. The Model 420 Flame Photometer retains many of the Model 410's attributes: ease of use, ease of maintenance and stable flame design but is enhanced with auto flame optimisation, internal standard referencing and on-board firmware to achieve significant improvement in sample throughput and precision. The time taken to set up and calibrate the instrument is much reduced; achieved by automatic ignition and optimisation of the flame conditions. The analytical performance is improved by the use of a Lithium Internal Standard signal which compensates for fluctuation in flame conditions. The internal standard feature (Reference Mode) can be turned off if required. Readings on both channels are linear over the working range of the Model 420 Flame Photometer. There are several monitoring and control functions included in the firmware; thus measurements can only be made after blanking and calibration.

The Model 420 Flame Photometer can operate in Continuous or Peak mode. In Continuous mode the instrument displays the current value on each channel and through the analogue ports. An instantaneous reading can be printed at any time. In Peak mode the Model 420 Flame Photometer automatically detects a stable reading, following sample introduction, for transfer to a printer or computer and the display is frozen until the next sample is introduced.

The Model 425 Flame Photometer (475 42 500)
Model 425 Flame Photometer shown with Model 860 Autosampler and Printerexpands upon capability of the Model 420 Flame Photometer with addition of an additional detector and filter for Calcium determination. It also offers the "301 mode" feature which allows connection to a number of the more popular continuous flow systems. Both the Model 420 Flame Photometer and Model 425 Flame Photometer have RS232 output for printer or computer connection and are compatible with our Model 860 Autosampler for unattended sample analysis. Both models may be used with the Model 805 Continuous Flow Diluter, again in-conjunction with or without the Model 860 Autosampler.

The Model 420 Model 420 BlueNotessoftware package is supplied with all Dual Channel Model 420 and Model 425 Flame Photometers. Should the user choose to operate their instrument with this software package they will soon realise it offers much more than just data handling, with the opportunity to greatly enhance the overall utility of the Model 420 and Model 425 Flame Photometer. See 420 BlueNotes (This is not the same package as Regulated BlueNotes 420 Software which is a chargeable item).

Model 410 Flame Photometer; Update and Automate Modules and packages.

The Model 410 Classic Flame Photometer can be upgraded with the Digital Interface/Linearisation Module which allows connection via RS232 to a serial printer or a PC.

This Module is compatible with all Model 410 Flame Photometers even those made by Corning 20+ years ago.

Model 410 Flame Photometer Upgrade and Automate Module

To Upgrade your instrument with the capability to connect to a printer or a PC add a Sherwood 410 Digital Interface/Linearisation Module (41086001). Simply remove the logo plate and push the Interface/Linearisation Module into the revealed space in the front panel - plugs straight onto the main PCB - no tools required.

Model 410 Digital Interface

To your upgraded Classic Model 410 or your Model 410 Industrial or Model 410 Clinical Flame Photometer you may now choose to connect a PC with Windows operating system to run with our:

410 BlueNotes software (41066000);

410 410 BlueNotesis a software package designed not just for data collection, storage, manipulation and report generation; it can also improve throughput, enhance precision and extend the utility of the Model 410 Flame Photometer.

Everything is visible on one operational page

With the 410 410 BlueNotessoftware package you can;

Model 410 BlueNotes

  • Use real names and sample numbers in your reports
  • Perform Multipoint calibrations with curve fit
  • Automatically correct for instrument drift
  • Save calibration curves
  • Save methods
  • Archive results
  • Prepare and print professional reports
  • Use Automatic Peak Selection facility to assess stability of readings
  • Automate analyses with addition of the Model 860 Autosampler

Model 410 Flame Photometer Instrument Update and Automation items and packages

41086001* Digital Interface/Linearisation Module
41086002* BlueNotes Upgrade (41086001 & 41066000)
41086003* BlueNotes Upgrade & Automation Package (86000009 M860 Autosampler & 41086002)
41066000* M410 BlueNotes Software
41086004* BlueNotes Automation Package (86000009 & 41066000)

*When ordering any of the above products/packages, you need to state the serial number of the instrument with which you intend to use them.

Flame Photometer Accessories

All Flame Photometers need a source of fuel gas and a clean, dry, pulse free air supply.

The fuel and air feed the flame within the instrument, the stability of which is important to instrument performance and therefore there are certain minimum standards acceptable for control of those two supplies.

In addition, the air supply is crucial to instrument performance in another way; it is air flow through the instrument's atomiser that determines the uptake rate and consistency of delivery of blank, calibrators and samples into the Flame Photometer.

For optimal performance, derived from both flame stability and smoothness and consistency of sample aspiration, Sherwood Scientific prefer that each Flame Photometer is connected to its own dedicated Air Compressor and that the Air Compressor be external to the instrument.

Propane, Butane or LPG from a cylinder source are the preferred fuels. Natural gas may be used with the appropriate Model 360 Flame Photometer (360 00 109) or with the Model 410 Flame Photometer if a Natural Gas Regulator kit (410 19 002) is purchased and fitted.


We have two specially designed Air Compressors available for use with Sherwood Scientifics Flame Photometers; the Model 851 and the Model 855. The Model 855 Air Compressor has a water cooled trap for operation in humid atmospheres. Both compressors provide a dedicated, clean, dry air supply which is vital to achieve stable flame conditions and constant sample delivery; essential for ensuring good precision of results. The correct part number has to be specified when ordering an Air Compressor to ensure compatibility with local electrical operating voltages.

The following Air Compressors are recommended for use with all Sherwood Scientific's Flame Photometer range i.e. the Model 360, Model 410, Model 420 and Model 425 Flame Photometers:

Model 851 Air Compressor Model 855 Air Compressor
M851 Air Compressor 115V - 85101000
M851 Air Compressor 230V - 85101001
M855 Air Compressor 115V - 85501000
M855 Air Compressor 230V - 85501001

Fuel Gas Regulators:

We supply primary fuel gas regulators to fit gas cylinders if required which provide a controlled pressure of gas to the Flame Photometer (preferably between 1 to 2 Bar). The gas supply from the primary regulator is supplied to the secondary regulator fitted as standard to all Sherwood Flame Photometers. The secondary regulator is factory set to supply the required internal pressure for operation of the instrument. To use Natural gas with any Model 410 Flame Photometer the Natural gas regulator kit has to be purchased and fitted to the instrument. To operate a Model 360 Flame Photometer with Natural gas you must order the appropriate Model 360 (360 00 109). Natural gas cannot be used with our Dual Channel Model 420 or Model 425 Flame Photometers.

Primary Propane Regulator assembly 001 08 234
Primary Butane Regulator assembly 001 08 439
Camping Gaz Regulator 001 08 732
Disposable Propane Gas Cylinder Regulator 477 08 400
M410 Natural Gas Regulator Kit 410 19 002
Primary French Propane Regulator assembly 001 08 233

The Model 805 Continuous Flow Diluter

  • Dual Rotor for reproducible ratios
  • Positive Pumping for accurate measurements
  • Uptake from original sample vessel
  • Fibrin clot remover
  • Excellent overall system performance

Model 805 Continuous Flow Diluter The Model 805 Diluter is compatible with all models of Sherwood Scientifics' Flame Photometers. It features two pump mechanisms, one for sample and one for diluent, which are permanently linked to ensure reproducible dilution ratios. Designed for the 200:1 ratio used for diluting Na and K solutions from clinical samples, it can also be used for a 50:1 ratio for clinical Lithium samples. When used with Models 420 or 425 Flame Photometers the Diluter can add automatically Lithium Internal Reference material at the optimal concentration.

The Model 860 Autosampler

Model 860 Autosampler

  • 40 sample capacity
  • Separate positions for Blank and Calibrant
  • Designed for use with all Sherwood Flame Photometers* (except the Model 360)
  • Works with or without Sherwood Model 805 Diluter
  • Works with 410 and 420 BlueNotesSoftware Packages

The Models 420 and 425 Flame Photometers were designed to interface bi-directionally with the Model 860 Autosampler, control sits in the Flame Photometer. They also work via 420 BlueNoteswith the M860 Autosampler

* The Model 410 Flame Photometers require a Digital Interface and 410 BlueNotesSoftware to run with the M860 Autosampler.

420 BlueNotessoftware (42066000)

(Supplied free of charge with all new M420 and M425 Flame Photometer)

Everything is visible on one operational page.

With the 420 BlueNotessoftware package you can: Model 420 BlueNotes

  • Use real names and sample numbers in your reports
  • Perform Multipoint calibrations with curve fit
  • Monitor all three (M420) or all four (M425) detector outputs simultaneously
  • Select Lithium or Potassium as the internal reference material
  • Save calibration curves
  • Save methods
  • Archive results
  • Prepare and print professional reports
  • Use Automatic Peak Selection facility to assess stability of readings
  • Automate analyses with addition of the Model 860 Autosampler

Serial Printer

Serial Printer

For those who require a simple printed record of results with a time and date stamp, we have a serial printer which can connect via RS232 to the Digital Dnterface in a Model 410 Flame Photometer or to the RS232 port on the rear panel of the Dual Channel Model 420 or 425 Flame Photometer.

Flame Photometer Installation and Performance

Note: do not install a Flame Photometer beneath overhanging cupboards. There must be at least 1 metre of clear space above the chimney. For optimum performance, installation should be in accordance with the following conditions:

  • The environment must be clean and free from dust
  • The instrument must be placed on a strong, level worktop, free from vibration. Approximately 500mm x 500mm of bench space is required, which includes an area in front for solutions and clearance at the rear for fuel and air tubing, with clear access to the mains supply switch
  • Avoid sites that expose the instrument to direct sunlight or draughts
  • To meet the specification the ambient temperature must be within the range +10°C to +35°C and the maximum relative humidity must not be more than 85%, non-condensing.


An A.C. supply between 90V and 240V ±10%, at 50Hz or 60Hz, is required.


All Flame Photometers require a clean (oil free), dry, pulse-free air supply capable of delivering up to 6 litres per minute of air at a minimum of 1 bar or 15 psi pressure. For a Sherwood Scientific Ltd specified Air Compressor,
see the compressor section.


A supply of Propane, Butane or Propane/Butane mixture regulated at the cylinder to 2.1kg/cm2 (30psi), flow rate at least 0.4 litres per minute. Primary regulators to fit cylinders are available as optional accessories from Sherwood Scientific Ltd.


A sink or waste container, sited to the right of the instrument, will ensure the minimum length of waste tubing. Do not use a waste container with high sides, as this will cause the drain tube to be lifted above the level of the constant head drain and poor drainage has a detrimental effect on performance.


For Calcium there is significant background interference from Sodium: The magnitude of that interference should be determined at the concentrations of interest by the operator.

For a full specification sheet for the Model of interest contact:


  • Ease of use with large, accessible, "upfront" work area for calibrator and sample presentation
  • Gas control/flame optimisation
  • Ease of maintenance with "no tools" approach to removing mixing chamber, burner stem and burner
  • Element filters easily accessible for cleaning and/or replacement

    Sherwood Scientific Flame Photometers feature as standard:

  • Optical "flame on" and air pressure detectors for instant fail safe flammable gas containment
  • "Cool" chimney
  • Full CE Compliance
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