StableWeigh for TDS

*StableWeigh for TDS


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.

     StableWeigh Approval

Click here for our article on An Alternative to Total Dissolved Solids and Total Solids Analysis

StableWeigh Methods and Method Equivalency Information:

Other StableWeigh Information:


Item No. Description
DF420580001 2.0 Horizontal Desiccator Cabinet, PVC

HotBlock TDS

Item No. Description
TDS024 HotBlock® - 24-Position, StableWeigh TDS HotBlock
TDS024-240 HotBlock® - 24-Position,StableWeigh TDS HotBlock, 240V

StableWeigh Products

Item No. Description
TDS100 StableWeigh TDS Vessel, 100pk
TDS100F StableWeigh Single-Place Filling Station
TDS111 StableWeigh Kit - TDS100 + W&D Filters,100pk
TDS200B StableWeigh Weighing Bracket, Each
TDS200R StableWeigh Modular Rack, 5-Place
TDS222 StableWeigh TDS Start-Up Kit w/6-place Filling Station
TDS222-230 StableWeigh TDS Start-Up Kit w/6-place Fill St 230V
TDS333 StableWeigh TDS Start-Up Kit w/1-place Filling Station
TDS333-230 StableWeigh TDS Start-Up Kit w/1-place Fill St 230V
TDS600F StableWeigh 6-Place Filling Station

StableWeigh Replacement Parts

Item No. Description
EE4061036 Replacement Hose Barbs for Filling Stations, 10pk
TDS601 StableWeigh Funnel + Stopper, Each
TDS602 StableWeigh Base O-ring, Each
TDS603 StableWeigh Outer Sleeve, Each
TDS604 StableWeigh Inner Sleeve, Each

Static Control Devices

Item No. Description
BAL100 Ionizing Cartridge 1"x3", EACH
BAL100H Balance Mount for BAL100, EACH


Do the StableWeigh vessels have an expiration date?

We do not assign an expiration date to the StableWeigh vessels.

what size filter do they use?

These filter funnels hold a 47 mm filter.

How can I verify the temperature on this? There is no slot for a thermometer.

To verify the temperature of the block we recommend use of an infrared thermometer. Measure at the bottom of one of the wells for the most accurate reading.

Do you recommend using gloves when handling the vessels?

Appropriate gloves are an essential part of conducting any laboratory analysis. You should always wear gloves to protect yourself from unknown contaminants in the samples you are handling.

What is the material of the upper container?

The filter funnel is made of polysulfone.

Hi there! Just wanted to get some pricing information on what we would need and the cost to try these out? Thank you for your time!

The start-up kits, TDS222 and TDS333, contain the recommended accessories to perform the analysis with the StableWeigh product. Of those items only the StableWeigh vessel and a static control device are absolutely necessary. The other items are for ease of use when working with the product. For pricing, please contact your sales rep to get a quote. If you don\'t know who your sales rep is please consult the map on this page - http://www.envexp.com/blog/108-sales-territory

Can BAL100 with BAL100H be used instead of TDS700?

Yes, it is possible to use these items for the control of static charge.

Do you have to use the StableWeigh vessels with the unit? Will a 125 mL glass beaker fit into the holder inserts?

You are not required to use the StableWeigh Vessel with the vacuum manifold. You may use any container that fits within the outer sleeve. It has an inner diameter of 3.4 inches.

Is this product suitable for use with ASTM D1739 - 98?

We are not familiar with that method and have not done any testing of this product with it.

What size of vacuum pump is recommended? And are there any methods for even distribution of the vacuum? Currently, if two pieces have vacuum drawing, one is drawing harder than the other.

We recommend a pump that has a minimum of 1.2 CFM air flow. If you experience uneven pull across the different stations please check to make sure the stopcocks have not come loose. This can lead to loss of vacuum. Look on the bottom of the manifold and check the nut holding the stopcock in place.

Where can I find a printout of the weights? Normally it is in the box, but this time it wasn\'t. Thank you.

We no longer include a printed out list of the weights in the box. We plan to have a downloadable sheet in the future but it is not yet available.

What is the difference between items TDS700 and EE1133696?

They are different brands of the same type of equipment.

where do I find certificate of analysis regarding TDS Vessels.

This product does not have a certificate of analysis.

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.

Click on an item to see additional information or ask a question.