STS SMF4 Portable Fluorimeter
STS Instruments are offering a new solution in the rapid on site identification of cross connected sewers and in tracing pollutants back to source. The SMF4 portable fluorimeter uses established fluorescent techniques to determine the polluted load by faecal matter in water courses and sewers, this measurement then enables a correlation to BOD to be established.
The instrument works by analysing a very small sample (approx 3ml) taken from the suspect water body. Whereas with a traditional BOD test where the sample would have to be sent to the lab and results generated 5 days later, the SMF4 gives an instant reading indicating the level of organic contamination present.
An instant survey of the sewer or water course can then be conducted to trace the pollution back to source and immediate action can be taken to prevent further discharge and contamination occurring.
A huge benefit is also that repeat samples can be taken to verify that the results are correct and that other factors have not influenced the sampling, something that cannot be done with a standard BOD test.
The instrument also lends itself particularly to semi skilled operators who do not need to have a sophisticated knowledge of sampling techniques or instrumentation in order to use the unit. The SMF4 offers a single button push to produce an instant reading. Further there are no reagents or consumables required making the lifetime cost of the instrument very attractive.
Where there are concerns of sporadic discharges that are difficult to monitor the SMF4 can be used in a continuous data logging mode capturing up to 2000 readings at intervals from 1 minute to 24 hours. (Separate flow cell and power supply will be required)
The design of the SMF4 draws on the research carried out by Prof Andy Baker at Birmingham University (UK), who showed that tryptophan is an excellent indicator of anthropogenic pollution and that it may be measured by fluorescence. Further research allowed strong correlations to be made between tryptophan and the standard Biological Oxygen Demand test (BOD).
Adjustable sensitivity settings enable the instrument to be used for a range of different pollutant levels without the need for costly and time consuming laboratory dilutions.
Applications for the instrument include Water Companies use in monitoring organic pollution in storm water sewers, assessment of BOD values through the waste water treatment process and monitoring discharges to watercourses. Regulator’s applications include monitoring of known problematic discharges, rapid response to reported incidents, monitoring of river water quality which may impact bathing waters and tracing of pollution events upstream.
Size including carrying handle 18 x 30 x 15 cm
Weight including batteries 2.2 Kg
Splash proof sealing
LCD Display 93 x 70 mm
Internal rechargeable batteries
Alphanumeric & Navigation Keypads
Cell holder and Cover
Internal Memory data capture of up to 2000 sample records
Automated serial sample data recording.
Instrument Function Menu
The instrument menu is accessible from the keypad and offers the following user defined settings:
-will allow specific sample number and location information to be attached to a sample record. Each sample captures a unique ID number, date, time and reading in addition to the 2 user definable parameters.
-the instrument has 4 sensitivity settings accommodating a wide range of Tryptophan concentrations. Concentrations can be measured from 0.05ppm to 25.0ppm Tryptophan, approximately equivalent to 1.0 to 15 BOD without dilution.
-may be turned on and off as light conditions require, the backlight will automatically be turned off after 5 minutes to preserve battery life.
-using a flow cell and pump the instrument may be set up to carry out a series of measurements over a specified period at user defined intervals. The results may be written to either the internal memory or to an external data logger.
The internal memory is capable of storing approximately the following:
1.3 days sampling at 1min intervals
6.9 days sampling at 5min intervals
20 days sampling at 15min intervals
41 days sampling at 30 min intervals
83 days sampling at 1hr intervals
250 days sampling at 3hr intervals
-may be downloaded via an RS232 port. A 9 pin RS 232 to RS232 / USB output is provided to connect the SMF4 to either a PC or data logger. PC requires Windows 98/2000/XP/7. The internal memory may also be cleared using the download function.
-date and time are set in dd/mm/yy and hh/mm
The SMF4 is powered by NiMH rechargeable batteries, which give a useful operating period of 20-30hrs. Approx 8hrs recharge time required using provided charger.
Battery life is shown by a battery level indicator icon on the LCD display.
Cell holder accepts standard fluorescence cells of 10 x 10 x 40 mm
Cell holder and cover will accommodate flow through cells for auto sampling.
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