Accessories for the Sherwood Flame Photometers
Diluter
Autosampler
Flame Printer
Bluenotes
Air Compressors
The Stability of the flame is key to stable readings and precise results. The air supply greatly affects the flame stability.
Sherwood Scientific supplies two models of air compressor:
The Model 851
Basic diaphragm type air- compressor with no oil contamination possible. Inlet contains exchangeable filter and output has silencer fitted. Maintenance kit containing replacement diaphragm available.
The Model 855
The Model 855 Compressor has a built in water trap to catch water condensed when operated in conditions of high humidity. The effectiveness of the trap can be further enhanced by connecting it to a source of cooled water.
The Model 805 Diluter
The diluter is designed for use with all Sherwood Flame Photometers. It features a continuous flow design with two rotor pumps moved via toothed belt from a single motor. One rotor pumps the diluent, usually water, to a mixing " manifold" where it meets the sample pumped by an occluded peristaltic rotor. Vigorous mixing takes place in a very small jewelled compartment and the mixed, diluted, solution is sent to a "weir" assembly where it is aspirated directly into the Flame Photometer The dilution ratios are 1 in 200 (for Na/K measurements) and 1 in 50 (for Li measurements). Standards and samples are presented to either sample pump tube, depending on the dilution ratio required. Other dilution ratios are available; contact your Sherwood Scientific distributor.
For use with the Model 420 Dual Channel Flame Photometer and the New Model 425 Four element Flame Photometer the Li Internal Standard tube is used in place of the Lithium Sample Tube. The lithium Internal standard 3 M concentrate is thus also diluted. This eliminates any dilution drift or error due to the diluter as the concentration of Internal Standard in the final solution going to the Flame will also be affected by pump changes and the correction will be automatically made by the Flame Photometer.
Autosamplers
Sherwood has a New Autosampler the Model 860.
The Model 420 Flame Photometer and the New Model 425 Flame photometer were designed to interface bidirectionally with the Model 860, which carries 40 x 2 ml sample cups together with a position for Blank and standard solutions. If used with a diluter e.g. for clinical analysis the sample e.g. serum is fed through the Model 805 Diluter into the M420/m425, which together with a printer, provides a fully automated system for clinical chemistry Na and K determinations.For other samples not requiring dilution the autosampler is connected directly with the Flame Photometer.
New Printer/Lineariser module for the Model 410 Flame Photometer
Sherwood Scientific Announces a new plug-in module,which is fitted to the front of the instrument,which contains the analog to digital converter and the RS232 serial output socket. This will accept any serial printer with the ability to accept data at 9600 baud. Sherwood can offer a suitable printer
This new facility is available to all existing users as the module fits directly into the front of the Model 410 under the logo plate
The module presents two buttons: one the user can toggle between Blank, Calibrate and Sample to select the current operation to be printed alongside the value displayed; the other button is the Print command which prints the displayed value as the blank/standard or sample is being aspirated.
The new module physically replaces the Lineariser module fitted to the clinical version of the Model 410 and the circuitry
incorporates the linearisation algorithm.This will correct for sodium values in the flame up to 40 ppm
It acts on the sodium channel and compensates for the non-linearity exhibited by sodium in all Flame Photometers for solutions with concentrations over 10 ppm
For customers not wanting to linearise their sodium readings the Lineariser function can be disabled
What's the lineariser for?
Sodium (Na) self absorption is a natural phenomena. When Na atoms are heated in the flame they become excited and then relax into their ground state. The energy released is by light being emitted which is what we can see as the yellow light. If there are very many atoms in close proximity ( i.e. higher concentration) the light itself can cause an adjacent atom to become excited so the light is absorbed by the sodium atom instead of falling on the detector. Thus the higher the concentration, the less light proportionally falls on the detector. All manufacturers correct for this as the algorithm is well known. On the model 410 we add a separate module ( lineariser module) whereas on the Model 420 we have built in this module.
Fig 2.7 Fitting Linearizer Module. 1 = 410 logo cover 2 = Linearizer module
New 
Automation for the Model 410 Flame Photometer
The M410 Upgrade package, consists of a plug in module having an A to D Converter plus Application Software, which upgrades the technical performance, reduces operator errors and saves operator time.
The M410 Automation package adds the Model 860 Autosampler, bringing full automation to existing Model 410 users.
The module is inserted into the position at the front of the Model 410. This means that the New module is available to all existing Model 410 users
The major advantages obtained by using the M410 are:
1 Automated calibration with curve fitting
2 Automated Sample analysis reported in concentration units
3 Periodic running of reference calibrators quality Control materials and blanks.
4 Automatic drift correction
5 Archiving of Calibrations and results by date and time
6 Storage of analytical procedures
7 Real time display of system operations
The Application Software operates on a Computer/Laptop via a Serial port. .
Software
The software application consists of three parts.
Calibration
Analysis
Operation with an Auto Sampler
