- Triple Inline TDS Meter TRM-1 - HM Digital
Why does BRS recommend this?
Using a RODI system without a TDS meter is like driving a car without a speedometer and gas gauge. At some point you will end up in trouble. With RODI systems it is TDS that you will want to monitor for performance and filter quality. If you have a single or dual DI stage we highly recommend a triple TDS meter as it will allow you to see your TDS readings in three places. We will usually suggest installing the triple TDS meter post source water, post membrane and post DI stage. These three readings will notify you when it's time to change the RO membrane and DI resin.
The TRM-1 Triple Inline TDS Meter from HM Digital is one of the most essential reverse osmosis accessories. This tool uses electrode probes to monitor the TDS of your reverse osmosis system in three places and lets you know exactly how the system is performing.
BulkReefSupply.com suggests: installing the triple TDS meter post source water, post membrane and post DI stage. These three readings will notify you when it's time to change the RO membrane and DI resin. This unit features a digital display and comes with three 1/4" GA Murdock Quick Connect Tee's with double o-rings to ensure a proper seal. As with all HM-Digital products, the TRM-1 comes factory calibrated.
TRM-1 TDS Meter Features
- Advanced microprocessor technology
- Auto-off function shuts off after 10 minutes of non-use
- Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.)
- Factory Calibrated: calibrated with a 342 ppm NaCl solution.
- Range: 0-9990 ppm
- Accuracy: ±2%
- Conversion Factor: NaCl (avg. 0.5)
- Cable Length: 24.5" (including sensor)
- Power source: 2 x 1.5V button cell batteries (LR44 or equivalent; included)
- Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)
- Weight: 79.4 g (2.8 oz.)
pretty good overall By Jesse on 1/18/2019Jesse would recommend this product to a friendI bought this a few years ago, a couple months ago some parts of the display stopped working. only used it a few times, maybe thats the problem? only ran fro a few seconds each time so could be the quick on then off did it... anyway it worked good enough to replace.
Poor quality By Arnold on 2/17/2018Arnold wouldn't recommend this product to a friendLasted just over a year and a half. Probally didnt use thie more than 30 times. Replaced the batterys and the screen is blank.
Good item, good price By DBR_Reef on 10/4/2016DBR_Reef would recommend this product to a friendJust make sure you don't touch the prongs, and this thing is very accurate
Useful Feedback By Anthony on 6/21/2016Anthony would recommend this product to a friendThe meter is easy to install on an existing RO/DI system and performs the job as advertised. Look and feel could be improved but is a very minor complaint.
Nice product By Tony on 8/3/2015Tony would recommend this product to a friendEasy to install and nice to see the incoming TDS, post RO and post DI.
No more guessing By Mike on 5/14/2015Mike would recommend this product to a friendIs this RO and DI thing working? I never knew. Now I do. A must have and a breeze to install.
Inline tds meter By Nate on 1/22/2015Nate would recommend this product to a friendJust installed mine along with a new ro membrane. So far this is great I can check whats coming in, after the ro membrane and after the resin.. I have wanted to do this for a year now, so glad that I made the purchase. easy to install just follow directions and you will be fine. LOVE IT!!
Perfect for saving money By Paul on 10/22/2014Paul would recommend this product to a friendI use this TDS meter on my inlet, after my RO membrane, and after my DI cartridges. It works perfect for multiple reasons. First, I know what my TDS coming in and going out of my RO membrane so I can tell if I'm getting the rejection I should and know when it's time to replace my membrane. Next, when I first turn the unit on, I can flush the good water coming out of the membrane until the TDS comes down so I'm not using up resin. This is from TDS creep, read about it if you haven't heard of it. Lastly, it tells me when I need to change my resin as the last one will show me if TDS comes above 0, so I'll know the resin is exhausted. Perfect and not a big investment.
Could not be simpler to use By Oz on 9/28/2014Oz would recommend this product to a friendProduct does what it claim and so far seems to do it well. It's very simple to operate.
It is great being able to monitor 3 stages of filtration By mfief on 6/26/2014mfief would recommend this product to a friendBeing able to monitor the TDS after the carbon blocks, ro unit, and after the DI resin is great. No need for un necessary filter changes. You can check three phases of filtration in seconds and replace only the necessary filters. This will save money in the long run.
I have a triple trm tds monitor on my bra 6 stage to system for two years. Now even after I changed all my filters in my Ro system it is reading crazy numbers. I am wondering if it needs calibration and so how do I calibrate it?
There is no calibration needed. Make sure you flush the system really well after changing filters and I would change the batteries as well.