Description
The SFP Services 1100 is a high performance sodium flame photometer designed for filter testing and many other specialized applications. The unit features extraordinary sensitivity and down to 10ng/m3 and when combined with certain accessories can allow the end user to test to the latest ISO 16900 international standards. Sodium flame photometers are in fact specified in certain global standards as the primary measurement method.
Purpose
To measure the concentration of a standard Na.Cl. aerosol both before and after it has passed through an air filtration device.
Sensitivity
Better than 10ng/m³ giving a minimum detectable penetration of less than 0,0005%. with a challenge aerosol of 13mg/m³.
Maximum Concentration
Continuous indication of mass concentrations up to 13mg/m³, but for short periods up to 20mg/m³ if calibrated to this level.
Test Aerosol
Produced by a single collision atomizer as described in EN143 using a 1% Na. Cl. solution giving a range of particle sizes 0,04µm to 1,2µm with a mass mean average of 0,65µm when measuring the longest diagonal or 0,4µm if measured aerodynamically.
Gas Supply
Hydrogen 1 l/m @ 1 bar. [ when compressed gas cylinders are used a suitable 2-stage regulator is required with the maximum out put pressure of 2 bar.]
Compressed Air
157 L/min @ 6 bar
Electrical Power
110 to 264 Vac 40 to 400 Hz. Single Phase.
Dimensions
1,5m long x 0,6m high x 0,55m deep
Weight
71 Kgs
Finish
Case :- Powder Coat – Mid Grey
Front Panels :- Semi-Gloss White
Principle of Operation
A volume of 15 to 40 l/m of test airflow is passed through the sample flow tube, by controlled convection a portion of this is drawn through a hydrogen flame and any Na.Cl. is burnt. When Na.Cl. is burn it generates a specific sodium yellow with a wavelength of 589nm. Between the flame and the PMT are neutral density filters [NDF’s], these are darken glass slides of known value, and an interference filter allowing only the sodium wavelength to pass. The NDFs are used to prevent an overload of the PMT when higher concentrations of Na Cl are burnt and to keep the meter reading on scale.
For aerosol concentrations up to approx 0,13mg/m³ the response is linear, above this level there is some light absorption by the flame, hence the curve on the calibration graph. The interference filter dedicates the photometer to sodium light therefore any other substances that do not burn with a sodium light are ignored in the final analysis of the penetration / efficiency of the test device. The Aerosol generator consists of a 3 hole nozzle, baffle and an aerosol drying tube.
The glass jar is charged with approx 600ml of NaCl solution at a concentration of 10g NaCl per liter. ( 1%) The atomizer nozzle is fed compressed air at 50psig; this pressure is passed through 3 holes 0,35mm dia. generating airflow of 15,5 to 13 l/m. This high velocity air passes over 3 siphon holes which draw up solution from the jar, this impinges on a baffle, large droplets fall back into the solution, while the smaller droplets are carried to an air drying tube, in this tube the droplets remain for at least 2 secs, to allow the water to evaporate and leave crystals of NaCl to form a solid dry aerosol of a specific particle size range to challenge the device under test.
Variations of Model are available as follows
Type No. 1100P
Bench Rig complete with micro manometer and test fixture for media testing.
Type No. 1100C
As Type 1100P except test fixture is for canister testing.
Type No. 1100 AL
Bench Rig with Filter resistance, and test flow measurement connected to a PC for Aerosol loading test. Contact SFP Services for the latest revision.
Type No. 1150
As Type No. 1100, incorporating a Type 1550 Low Flow Photometer, drawing 2 l/m, sample suitable for T.I.L., media or filter testing to EN 136; 140; 143; 149;15941 & 15942.
