Two-in-One Sampler
This sampler is a highly sophisticated piece of equipment that has the following features:
It allows ease of access:
- The primary cutter can be inspected and accessed via a bolted hatch on the top and side of the housing, while the secondary cutters can also be inspected via an inspection cover on the top of the secondary housing.
- The primary and secondary drive units are self-contained, and are situated on the top of the units.
- The blades of the primary and secondary cutters are easily accessible and replaceable with some adjustment possible on primary cutters.
It provides efficient and effective sampling:
- The slot width of the cutter is 3 times the nominal particle top size of the solids with a minimum of 10mm, preferably 20mm. Two-In-One Slurry Samplers generally have 20mm wide primary cutter gaps with between 10 and 40mm cutter widths on the secondary vezin sampler
- The sampling spoon of the primary unit cuts the full stream of the slurry. The sampled slurry reports to the secondary vezin sampler where the 4 cutters, cut the full stream of the primary sample. The primary sample is restricted via a conical insert at the inlet to the vezin sampler, to ensure multiple cuts of the primary sample increment are taken.
- Primary and secondary cutters travel at 0.6ms -1 or less and the cutter speed is consistent throughout their travel.
- Primary and secondary cutters cross the streams at 90 degrees to their respective feeds.
- Primary cutter alternates its parked position between two proximity sensors. The vezin’s cutter/s runs continually throughout the primary sampling interval to ensure representative sampling.
The unit limits splashing when taking primary cuts. The hood and cutter assembly are made of durable stainless steel with the drive units being splash and dust protected.
The Two-in-One Slurry Sampler
(Cut-Away Section)
Description Of The Components Of The Sampler
The “Two-in-One” sampler as the name suggests is two separate units in one. The primary and secondary sampler units are assembled into a common support frame. These sampler units are discussed separately below.
The Primary Unit
The Housing
This is of an all-welded construction, mild steel with vulcanised rubber lining to ensure the long life span of the unit. The inlet and outlet flanges are to standard specifications (SABS, NEMA, DIN and others) to allow for ease of installation. This may however, vary from client to client. It must be noted that the discharge flange is typically two pipe sizes larger (i.e. 100mm in ?) than that of the inlet.
The Sampling Cutter Assembly
This is manufactured from abrasion resistant and non-corrosive stainless steel with a low coefficient of friction, thereby ensuring no “hang-up” of material. The cutter itself, also manufactured from stainless steel, ensures that a constant slot width is maintained for extended periods. The two cutter blades are adjustable and screwed into the hood. The cutter is fitted and bolted onto the end of the sub arm assembly with the cutter blades diverging radically. The sampling pipe discharges vertically into the restricted conical feed section of the vezin sampler.
The Geared Brake Drive
Standard units ranging from 0.25kw - 0.55kw at 11 - 17 rpm are used.
There must be a free discharge of slurry from the base of the sampler. Under no circumstances can this sampler be used on a pressurized or inclined line.
The Secondary Unit
The Housing
The housing is of lightweight, chemically inert, polyethylene construction with all impact surfaces rubber-lined. The reject stream discharges through the side directly into the primary unit’s discharge pipe-work.
The Electric Drive
This is a standard 0.18kW geared, motor that drives the cutter/s at ?28 rpm (or 1,46 m/s).
The Polyethylene cutter assembly
This is mounted underneath the drive shaft of the geared motor. It is made from hollowed and moulded polyethylene and has stainless steel cutter blades. The final sample is discharged out the bottom of the cutter assembly. The cutter/s are preset to 10, 20, 30 or 40mm and can range in number (1 to 4), giving a large range of possible division ratios.
The functioning of the sampler
The diagram below shows:
- The feed of slurry into the inlet pipe of the primary unit
- The movement of the primary sample into the secondary unit, while the rejects (main process stream) move down through the primary unit
- The movement of the secondary sample from the secondary unit into the sample discharge pipe while the material sample from the secondary unit re-enters the process stream within the primary unit.
