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Old August 14th, 2014, 11:52 AM
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Default TDS units

Im very interested in the TDS units that have been discussed in a few threads. I know Bob does a lot with them and has put together a set up on his Home build RO. I have a few questions

Do they make a complete unit
1 are they universal as far as what they detect
2 do they need periodic cleaning
3 will they show how much solids are being detected.
4 what is a reasonable price for a complete unit.
5 If they do show percentages what would 2% sap show up as with both the sugar and minerals combined.
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Old August 14th, 2014, 03:50 PM
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Default TDS units

Haynes look on wishlist's RO thread. Another homebuild RO, post #49 and 50.
http://www.waterfiltersonline.com/tds-sources.asp

Last edited by regor0; August 14th, 2014 at 04:46 PM.
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Old August 14th, 2014, 06:36 PM
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More requirements want a unit that I can mount in my RO panel or on the wall with a remote probe in the permeate line. I would also want a probe in the concentrate line so when Im rinsing the membrane I can keep filling the concentrate to the tank and when the meter shows a certain level I will transfer to the bulk tanks. I don't want a hand held unit I want to see at a glance that Im not passing sugar.

Last edited by Haynes Forest Products; August 14th, 2014 at 08:15 PM.
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Old August 14th, 2014, 06:56 PM
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This is the one I have. eBay $40.

TDS units-imageuploadedbytapatalk1408056936.993345.jpg

Commercial Inine Dual TDS meter (monitor)

This high quality inline dual TDS monitor is made by HM Digital and distributed by Filter Direct Co.

Model: DM-2

FEATURES
Highly efficient and accurate due to its advanced microprocessor technology.
Displays TDS levels of the Feed Water and Product Water with in & out electrode probes.
Auto-Off function conserves battery power. The unit shuts off automatically after 3 minutes (new version).
Dual Range - Measures from 0-999 ppm, with a resolution of 1 ppm. From 1000 to 9990 ppm, the resolution is in 10 ppm increments, indicated by a blinking 'x10' image.
Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
Comes equipped with 1/4 inch John Guest Quick-Connect T-fittings as shown. Also available with 3/8" or 1/2" fittings at additional $8 charge
Installs quickly and easily.
Differences from the DM-1:
Designed for commercial/industrial applications.
Stronger, water-resistant casing.
Calibration can be done individually or simultaneously on each line.
Improved design, including an extra large, easy-to-read LCD display.
Longer, waterproof, shielded cables.
Variable mounting bracket
SPECIFICATIONS
Range: 0-9990 ppm
Accuracy: 2%
Cable Length: 46" (including sensor)
Calibration: Factory calibrated to NaCl 342 ppm. Re-calibration can be done separately for each line, or simultaneously for both.
Power source: 2 AAA batteries (included)
Battery life: over 1000 hours of continuous use
Size: 11.6 x 6.8 x1.8 cm (4.6 x 2.6 x .7in.)
Weight: 201.3 g (7.1 oz.)
Measure the tap water coming in vs. the purified water going out of your system at any time.

Use the meter to determine when the filters need to be changed.

Install on industrial systems such as car washes, window washing, manufacturing, and food processing.

Warranty: Factory 2 years warranty



* Any questions: call us at 714-953-9009 (M-F 9AM to 4:30PM pacific standard time)
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Old August 16th, 2014, 09:09 AM
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regorO Im going to order the TDS meter you showed me. I like the duel probe idea I can put one on the concentrate line to check for sugar during the rinse cycle and a probe on the permeate line for passed sugar. They do make a 3 probe unit..........................is there somewhere else I need a probe.
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Old August 16th, 2014, 10:22 AM
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I'm not touching that one!
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Old August 16th, 2014, 11:13 AM
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I have that same one as Roger listed. Works well for its intended purpose. :)

Last edited by wishlist; August 16th, 2014 at 12:15 PM.
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Old August 16th, 2014, 12:01 PM
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OK Bob what is the intended purpose? I ask that because we are trying to detect sugar in the permeate correct and does it do that well. Have you used it to see what it reads with 2% sap?
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Old August 16th, 2014, 12:25 PM
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Yes , Chuck I use it to check sugar in the permeate. I would say that me and hydrometers don't get along to well. Seems I always break them and with the tds meter I can check it without ordering dozen of sap hydrometers every year.

As Dr Tim told me it should read 0 or pretty darn close. I really didn't pay much attention to the concentrate side readings. I noticed it would increase as I was recirculating concentrate and I did check sap with the hydrometer on the concentrate side occasionally.

I think what your asking is could we reference the tds readings on the concentrate side and get a sugar percentage? My understanding is no , it won't work accurately. I would like to get some numbers this season just to see what happens.
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Old August 16th, 2014, 12:30 PM
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On the permeate side mine will read 2-3ppm and concentrate the longer you recirculate the higher it goes. My understanding is it can't read the sugar, it detects the minerals. At least that's what the fella from the company that makes them told me.
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