Controlled AlfaDos™ Dropping Funnel
Like a traditional dropping funnel, the innovative AlfaDos™ dosing system is simply driven by gravity and does consequently not require any pumps. Thus, the problems are eliminated which always occur in the case of pumps, such as media incompatibility, suction problems or bubbles.
In addition, this results in a considerable cost saving, no costly balances and pumps are required. The flow is controlled by a solenoid valve. As no measurement and no regulation of the flow takes place, the dosing rate is not constant. However, in some cases, such as for the pH value control, the maintenance of a certain dosing rate is not so important. Here AlfaDos™ is the absolutely most inexpensive solution.
The Advantages
- Simple dosing functions
- pH value control
- Redox control
- Titration
- Dosing, subject to the size of the process involved
- Inexpensive
- Compact and robust
- Does not require pumps
- Resistant to aggressive media
- Easy to clean
An AlfaDos™ system consists of a glass stainless steel or plastic storage vessel. Outflow takes place by gravitational force or applied pressure and is controlled via a solenoid valve.
Dosing under pressure or vacuum is possible if a pressure compensating line is installed.
Application examples
Traditional dropping funnels or dosing devices with pumps and balances are replaced by AlfaDos™ if the requirements for a constant dosing rate are low or the dosing is regulated based on another variable, for example the pH value or the Redox potential, or if a process signal such as the temperature is used as a controlled variable.
In the standard model only glass, PTFE and PVDF are used as materials in contact with media. Special variants in other materials are possible.
AlfaDos™ dosing facilities occupies one channel on a digital output panel/digital output module for the valve.
| Viscosity range | 0.1…100 mPa∙s |
|---|---|
| Pressure range | 0…1 bar absolute (for overpressure on request) |
| Flow range H2O (di=2 mm, h=50 cm, no pressure) | up to 100 ml/min |
| Flow range H2O (di=1 mm, h=50 cm, no pressure) | up to 20 ml/min |
| Flow range H2O (di=2 mm, 1 bar auxiliary pressure) | up to 500 ml/min |
| Product Code | Description |
|---|---|
| IL-GRAVLBB250 | Receiver tank* 250 ml, borosilicate glass, PTFE plug, GL14 connection, 250 g |
| IL-GRAVLBB500 | Receiver tank* 500 ml, borosilicate glass, PTFE plug, GL14 connection, 350 g |
| IL-GRAVLBB2000 | Receiver tank* 2,000 ml, borosilicate glass, PTFE plug, GL14 connection, 900 g |
| IV-MB-A-ETFE-1,5-UNF-T | Universal 2/2-way laboratory valve nominal bore 1.5 mm, Kv 0.039 m³/h, resting position: closed, 3 m LabManager® connecting cable |
| IV-MB-A-ETFE-1,5-UNF-O | Universal 2/2-way laboratory valve nominal bore 1.5 mm, Kv 0.039 m³/h, resting position: closed, 3 m open connecting cable |
| VL-K-6606-UNF | Valve bracket for aluminium profile (40 x 40 mm), for valves with UNF connection |
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Gravimetric Dosing GraviDos®
Like a traditional dropping funnel, the innovative GraviDos® dosing system is simply driven by gravity and does consequently not require any pumps. Thus, the problems are eliminated which always occur in the case of pumps, such as media incompatibility, suction problems, bubbles, etc. The integrated weighing system takes up so little space that several dose loops can be comfortably integrated into one compact laboratory plant.
In addition, this results in a considerable cost saving, as no costl balances and pumps are required. The price advantage particularly comes to bear when several dose loops are required.
The Advantages
- Gravimetric Dosing
- Weighing of vessel content
- Weighing of reactor content
- Inexpensive
- Compact and robust
- Does not require pumps
- Easy to clean
- Wide dispensing range
- ass flow metering
- pH value control
- Titration
- Refilling without interruption to dosing
- Optional pulsation-free dosing
- Resistant to aggressive media
- Ex-compliant version available
A GraviDos® dosing system consists of a glass storage vessel which is suspended from a weighing system. The weight change is recorded and the flow is regulated via a solenoid valve according to the weight signal. As such, it is a true form of mass flow control which does not have to be calibrated for different materials and which remains unaffected by the formation of bubbles.
Optionally, pulsation-free dosing can be achieved by using a proportional valve. Dosing under pressure or vacuum is possible if a pressure compensating line is used.
When connecting to a LabManager®, one GraviDos® dosing device occupies one measuring channel on the GraviDos® slide-in module (LM-SG). One channel on a digital output module is occupied for an open/closed valve.
The pulsation-free dosing option requires requires one channel on an analogue output module. Auxiliary pressure may be applied to the receiver tank for the dosing of liquids with a high viscosity or where there is a lack of a slope.
Gravimetric dosing control is carried out by the LabManager® system in either batch-quantity or rate dosing mode.
A HiText™ example application is included in the scope of delivery. The unit operation "Dosing Gravi" (SL-GOPDOSIGRAVI1) exists for operation with HiBatch™ batch control. This allows refilling without an interruption to dosing even when the system is in operation.
For stand-alone dosing and filling applications, various control units are available.
Load Cells
| Measuring resolution | about 0.01 % of final value |
|---|---|
| Measurement uncertainty | about 0.1 % of final value |
| Dimension of load cell (without frame) (L xW xH) | 200 x 40 x 50 mm |
GraviDos®-Stirring System
The GraviDos® stirring system (MiniStirrer™) can be easily installed in place of the Gl 45 cover.
GraviDos® Suspended Balance
The GraviDos® dosing system is based on the GraviDos® suspended balance IW-GRAVIHWxxx.
In comparison to a laboratory scale it is very compact and is suitable for use in processes.
GraviDos®-Pressure Resistant
The system can work under a pressure of up to 345 bar with the pressure-resistant GraviDos® receiver tank IL-GRAVLBSxxx and a high pressure valve.
GraviDos®-Control Device for Stand-Alone Operation
The GraviDos® stand-alone system also enables gravimetric dosing control even without a LabManager® automation system. The flow set point, the end weight and the dosing time can be pre-set both via the integrated keyboard and via a serial or analogue interface.
Gravimetric Dosing Station
Consisting of LabDos®, GraviDos® and special rack.
Options: Magnetic stirrer IW-GRAVIGMAGSTIRR and heating unit IW-GRAVIGHEAT.
Quadruple Dosing System with GraviDos®
The gravimetric quadruple dosing system is a space-saving solution for the dosing of reactants of low to medium viscosity.
GraviDos®-Heeating Jacket
GraviDos® receiver tanks may be heated using an GraviDos® heating jacket.
| Product Code | Description |
|---|---|
| IW-GRAVIHW1000 | Suspended balance 1,000 g, for a receiver tank of up to 500 ml |
| IW-GRAVIHW3000 | Suspended balance 3,000 g, for a receiver tank of up to 2,000 ml |
| IW-GRAVIHW7000 | Suspended balance 7,000 g, for customized receiver tank |
| IW-GRAVIHW10000 | Suspended balance 10,000 g, for customized receiver tank |
| IW-GRAVIHW15000 | Suspended balance 15,000 g, for customized receiver tank |
| IL-GRADOMV1 | External single-channel measuring amplifier for the connection of a suspended balance to an analogue input |
| IL-GRADOAMP1D | External digital single-channel measuring amplifier for connection to an RS-232-V24-interface |
| SL-GRADOLABVIEW | LabVIEW-driver for the testing of the external digital single-channel measuring amplifier IL-GRADOAMP1D |
| IL-NGSAMP1D-SN | Plug-in power supply unit for digital measuring amplifier IL-GRADOAMP1D, IL-AINAMP1D, IL-PTAMP1D |
| LM-SG | Slide-in module 4 x DMS bridge input for GraviDos® suspended balances, for LabManager® |
| LM-DO | Slide-in module 4 x digital outputs |
| IL-GRAVLBB250 | Receiver tank* 250 ml, borosilicate glass, PTFE-plug, GL14 connection, weight 250 g |
| IL-GRAVLBB500 | Receiver tank* 500 ml, borosilicate glass, PTFE-plug, GL14 connection, weight 350 g |
| IL-GRAVLBB2000 | Receiver tank* 2,000 ml, borosilicate glass, PTFE-plug, GL14 connection, weight 900 g |
| IL-GRAVLBS150 | Receiver tank 150 ml, 345 bar, stainless steel 316L/ DOT-3A 5000 TC-3ASM, 1/4“ NPT, incl. fitting |
| IL-GRAVLBS300 | Receiver tank 300 ml, 345 bar, stainless steel 316L/ DOT-3A 5000 TC-3ASM, 1/4“ NPT, incl. fitting |
| IL-GRAVLBS500 | Receiver tank 500 ml, 345 bar, stainless steel 316L/ DOT-3A 5000 TC-3ASM, 1/4“ NPT, incl. fitting |
| IL-GRAVIHEAT250 | Heating jacket for GraviDos® feed 250 ml |
| IL-GRAVIHEAT500 | Heating jacket for GraviDos® feed 500 ml |
| IL-GRAVIHEAT2000 | Heating jacket for GraviDos® feed 2,000 ml |
| IL-GRAVIHEATSON | Heating jacket for GraviDos® special variant |
| IV-MB-A-ETFE-1,5-UNF | Universal 2/2-way laboratory valve nominal bore 1.5 mm, Kv 0.039 m³/h, resting position: closed |
| VL-K-6606-UNF | Valve bracket for aluminium profile (40 x 40 mm), for valves with UNF connection |
| IV-MB-A-VA-1,2-G1/4 | 2/2-way laboratory valve made of VA 1.4581, nominal bore 1.2 mm |
| VL-K-2200 | Valve bracket for aluminium profile (40 x 40 mm), for valve IV-MB-A-VA-1,2-G1/4/ IV-MB-A-VA-2-G1/4 |
| IL-GRADOADV | Square-ended adapter, transition piece measuring cell on square aluminium assembly systems |
| IL-GRADOADR12 | Round adapter, transition piece measuring cell on 12 mm tubular assembly systems |
| IL-GRADOADR14 | Round adapter, transition piece measuring cell on 14 mm tubular assembly systems |
| IL-GRAVI-KAL1000 | Calibrating weight 1,000 g including GraviDos® balance |
| IL-GRAVI-KAL2000 | Calibrating weight 2,000 g including GraviDos® balance |
| IW-GRAVISTATION1000 | Gravimetric dosing station for vessels of up to 1,000 g |
| IW-GRAVISTATION3000 | Gravimetric dosing station for vessels of up to 3,000 g |
| IR-MINISTIRRGR11-l | MiniStirrer™ stirring unit for GraviDos® with control device, maximum 11 Ncm |
| IR-MINISTIRRGR22-l | MiniStirrer™ stirring unit for GraviDos® with control device, maximum 22 Ncm |
| IL-GRAVIDOS4-2211 | Quadruple dosing system with GraviDos®, 2x2 l und 2x1 l, vacuum refilling unit, display for vacuum and inert gas |
| SL-GOPGRAVITARI | HiBatch™ basic operation: Taring of a load cell |
| SL-GOPDOSIGRAVI1 | HiBatch™ basic operation: Gravimetric dosing without refill option |
Downloads
- Catalogue laboratory apparatus and accessoriesCatalogue excerpt laboratory apparatus and accessories15 MB