StableWeigh for TDS
NEW AND REVOLUTIONARY
Total Dissolved Solids (TDS) Vessels
Replacing Crucibles Around The World!
Refine your Total Dissolved Solids (TDS) analysis using Environmental Express StableWeigh™ vessels. Replace your current crucible or dish with our patented StableWeigh™ vessels. The vessels and related products work together to help you perform the TDS analysis more efficiently and more accurately.
StableWeigh™ reduces the amount of time you spend preparing, weighing, cooling, and cleaning your evaporation vessels. The disposable vessels are prepared and weighed for you, allowing you to start your analysis immediately without the cumbersome task of drying a crucible and obtaining the tare weight. StableWeigh™ vessels are inert to common water and waste water components and are heat resistant at the temperature required by the method. Because the mass of the vessel is an order of magnitude lower than a traditional glass or ceramic crucible the StableWeigh™ vessel does not hold as much heat energy and will cool to balance temperature much faster. Having the mass of the vessel closer to the mass of the weighed residue also gives greater precision and accuracy. This will help to reduce the number of drying and weighing cycles needed to obtain a constant weight. Once you are done with the analysis the vessel can be disposed of which eliminates the need for washing and the possibility of carryover from one sample to the next.
Click here for our article on An Alternative to Total Dissolved Solids and Total Solids Analysis
StableWeigh Methods and Method Equivalency Information:
- StableWeigh Total Solids Method
- StableWeigh Total Solids Method Equivalency Report
- StableWeigh Total Solids Method Equivalency Checklist
- StableWeigh Total Solids Equivalency Checklist for Lab Chemists
- StableWeigh Total Dissolved Solids Method
- StableWeigh Total Dissolved Solids Method Equivalency Report
- StableWeigh Total Dissolved Solids Method Equivalency Checklist
- StableWeigh Total Dissolved Solids Equivalency Checklist for Lab Chemists
- StableWeigh Data Report from Edward Askew Consulting
Other StableWeigh Information:
HotBlock TDS
| Item No. | Description | |
|---|---|---|
| TDS024 | HotBlock® - 24-Position, StableWeigh TDS HotBlock | |
| TDS024-240 | HotBlock® - 24-Position,StableWeigh TDS HotBlock, 240V | |
StableWeigh Products
StableWeigh Replacement Parts
Static Control Devices
| Item No. | Description | |
|---|---|---|
| BAL100 | Ionizing Cartridge 1"x3", EACH | |
| BAL100H | Balance Mount for BAL100, EACH | |
| BAL200 | Grounding Kit, EACH | |
Question/Answer
We are accredited for SM2540-2011. Are these vessel approved for use with this version of SM?
The EPA approves methods based on the chemistry contained within, not the equipment that is used. While the method specifically state to use evaporation dishes of porcelain, high silica glass, or platinum; laboratories are free to use other materials. You must perform a duplicate QC analysis with the listed equipment and the alternative equipment. Keep this data on file. There are other documents found on this page (http://www.envexp.com/products/1-Wet_Chemistry/PW-Solids_Testing/TDSSW-StableWeigh_for_TDS) that will help with any other requirements.
Do you have a replacement part number for the O-ring that is attached to the filter funnel?
We do not currently have that o-ring as a replacement part.
Is the TDS024 HotBlock programmable?
It is not programmable. This controller is the same as is found on our regular HotBlocks. You can pick a temperature up to 150°C and it will hold at that temperature for as long as the block is turned on. The block is intended for evaporation of the liquid only. You will still need an oven capable of maintaining 180°C for the second stage of the drying process.
Could you use beakers instead of the StableWeigh vessels in the 6-place Filling Station?
Some size beakers will fit in the filling station. You would need to no use the inner shell to allow room for them to fit. There is a hole on the floor of each station that allows the vacuum to pull. It would need to remain uncovered.
what is the pore size for TDS111 StableWeigh Kit. TDS100+W&D Filters, 100pk
These are the same filters as F92447MM, Washed and Dried Filters. They are glass fiber, 1.5 micron.
Do you have a sample pack of the Stable weigh vessels?
Please use part number TDS100S to request a sample pack of the StableWeigh vessels.
Do you have samples of these for trial purposes?
We do offer sample packs of the TDS vessels. Use item TDS100S. If you want a sample pack of the washed and dried filters please use item F92447MMS.
Are the StableWeigh TDS vessels recyclable?
We have not put a recycling code on this product. It does contain a fluoropolymer, so it would be a category 7 at best. Check with your local recycling center for more guidance.
Are the plastic bags recyclable?
We have not put a recycling code on this product. It does contain a fluoropolymer, so it would be a category 7 at best. Check with your local recycling center for more guidance.
The StableWeigh TDS Vessel are double weigh until constant weight is reach?
Standard Methods does not require replicate weights to obtain the initial tare weight of the evaporating vessel. It only requires replicate weights on initial weights for filters for TSS and on the final dry weight for all residue analyses.
We have the first generation vaccuum bell- will it hold the bigger bags?
The StableWeigh vessels haven’t changed size so they should fit in your filling station.
are the TDS disposable vessels weighed twice for verification of stability? and is this provided to the customer?
Standard Methods 2540C.3.b, 23rd Edition, does not require that the evaporating dish be weighed twice for verification of stability. It only states to heat the dish to 180 ± 2°C for ? 1 h in an oven, cool dishes to ambient temperature, and weigh. Our StableWeigh vessels meet these requirements and are specifically cited in SM 2540B.2.a, 23rd Edition, as an approved sample dish.
We already have a bell jar filtration device. Can we buy the \'cup\' that holds the vessel separately?
We do not sell the support stand separately.
What is the maxium volume that can be used?
The vessel can hold approximately 300 mL of liquid.
I would like to know the Total cost for Stableweight TDS vessels
All of our pricing is available online by logging into your customer account with your customer ID. If you need help accessing or setting up your online account please call our customer service department at 800-343-5319. You can also contact your sales representative and they will be able to better discuss pricing with you.
Do you have to use the deionizer with the stableweigh system?
We highly recommend that some form of static control is employed when using our StableWeigh vessels. We have several static control products available if you do not currently have a system in place.
Of what is this made?
This is made of plastic, metal, and electrical components. This does not contain any radioactive components.
What\'s the capacity (mL) of these vessels?
The StableWeigh vessels can hold about 300 milliliters.
I notice the ASTM D5907 is the only method listed under method compliant. Are these also compliant with SM2540C? Thanks.
Currently, StableWeigh is only method compliant with the ASTM D5907 method. There is an update coming very soon to SM2540 which will specifically allow for our vessels to be used. The method update will actually mention StableWeigh by name.
what type/model of steam bath can be used? And how to do keep them straight up after filtration?
Any type/model of steam bath can be used to evaporate the samples to dryness. The method allows for you to use an oven to evaporate the samples as well. We recommend the temperature to be set between 103-105 C. Our filling stations support the vessel during filtration. They should then be placed in our modular rack, TDS200R, throughout the rest of the test.
What are the deminsion fo the modular rack?
Dimensions of 5-place modular rack:\r\nLeft to Right - 14.25\" \r\nFront to Back - 12.75\"\r\nTall - 4\"\r\n
Are TDS vessels like plastic bags? Start-up kit pricing?
Although they may look like plastic bags, they are vessels made from a proprietary polymer blend.
Good morning. Do you offer trial samples of these?
We do offer samples of our StableWeigh vessels. The part number is TDS100S.
How do you use it ?
These vessels were designed to replace traditional crucibles. They come preconditioned and preweighed so they are ready to use right out of the box. Filter your sample through a 1.5 um washed and dried glass fiber filter into the vessel. Place the vessel into an oven/steam bath to evaporate to dryness. Bake in 180C oven for 1 hour. Cool in desiccator to balance temperature (about 15 mins). Weigh the vessel with the residue. Calculate your TDS value. Discard vessel.
