The VSSD was developed specifically to permit elimination of manual sample mass division in sample preparation protocols. When subsamples need to be prepared to an accurate mass for subsequent aliquot preparation by fixed rotary division or for weighted-composite sample make-up, the VSSD will do it quickly with the minimum possible assay variance.
Stand-alone Mode: The VSSD can be operated in a stand-alone manner (manual mode).
Auto mode: It can be interfaced to your Laboratory Information Management System (LIMS) via a simple serial link. Commands comply with the ModBus protocol. With or without the LIMS being active, all operator control of the sample division is made using an industrial grade Touchscreen with simple displays that take the operator through the division process as well as protects the sample integrity. The dialog between the LIMS and the VSSD can be customised to suit your operations.
Rather than operating in a circular motion, which wastes time when dividing out a single subsample, the VSSD oscillates back and forth through the falling stream of material. The cutter is controlled so that it can be paused while the cutter is collecting the full stream of material or is collecting none of the material; this permits precise control of the mass of the subsample. The cutter is directly driven by the PLC ensuring that the cutter speed is constant while the cutter edges are passing through the stream. This ensures that the subsample is cut out in a manner that is as ‘correct’ as a conventional rotary divider.
The Malvern Engineering Cross belt (or hammer) sampler has been robustly designed using the ISO 13909 standard as a basis for design. In most cases the sampler will mount directly onto the stringer or gantry section of the conveyor belt where a sample is required to be taken.
The sampler has been designed with a double sweep/cleaning system which together with the flexible idlers supplied with the machine shapes the belt contour and ensures that a clean cut is taken. The servo controlled asynchronous servo-motor with minimum backlash gearbox ensures absolute speed control of the sampling arm and the most correct sample as a result. The sampling arm is designed to make contact with the belt to ensure a clean cut of material is taken. Damage to the belt is mitigated by installing belt tracking limit switches to ensure the belt is tracked as well as a system that leads the sampling arm onto the belt when it first makes contact.
The sampler has 4 modes of operation, Manual, Auto Timed, Remote and Inspection/Maintenance. The inspection/maintenance mode includes two pre-programmed positions of the sampling arm which are directly opposite the two inspection ports in the sampler body. This allows for easy inspection and maintenance of the sampling arm which if regular maintenance protocols are followed will result an accurate sampling. The control panel has a number of feedback items that allow the user to monitor the sampler, including: sampler on, sampler healthy, remote selected, sampler homed sampler tripped, drive ready, drive running, tracking left and right.
The sampler is fitted with skirts on the feed and discharge side of the conveyor and is fitted with a motion alarm/siren for safety purposes. The samplers are supplied as standard or with a square to round chute as an optional extra.
Malvern Engineering manufactures a precisely-controlled interleaving sampler which extracts two nominally identical samples from a flow of dry material. When both samples are prepared and analysed, the difference between the two assays is a direct measure of all sampling uncertainties: sampling, preparation and analysis. There is no other reliable means of providing an undisputable measure of sampling precision.
The sampler is designed to have minimal hang-up and is dust tight in order to ensure minimal dust losses, and is especially advantageous when splitting high value streams. There are two drive options, a stepper motor drive system or a variable speed sensorless vector controlled, geared drive system. The stepper motor system allows the system to be more flexible and can be programmed to extract different sample masses from the lot, whereas the variable speed drive option is less flexible, however more cost effective.
Rotary sample division is an extremely reliable method for mass reduction of a sample. It is critical in the mass reduction process that each segment of the RSD receive a large number of sample/splitting increments. The large number of increments ensures that any material segregation (distributional heterogeneity) in the starting sample is radically reduced in each of the subsamples.
The Malvern Engineering rotary sample divider is a heavy duty construction with a robust drive train that ensures constant speed throughout the splitting process which minimises sample variance. It also incorporates a state of the art feeder which ensures a constant flow of material to the splitting section, which can be calibrated per application to suit the relevant material being split.
|Sample Capacity [litre/cu ft]||15/0.53||Dimensions [mm]||1350 x 750 x 1453|
|Division Ratio||1:10||Voltage||200-240 VAC, 50 Hz|
|Speed of rotation [m/s]||0.3||Power [W]||500|
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