Dual Inline TDS Meter DM-1 HM Digital problems

shifty51008 · 07/13/2012, 08:30 AM

I have had this TDS meter for about 5 years now. after changing all the filters and membrane, I was still getting a reading of 2 on the output of my dual DI. at this point I decided to calibrate the probes, I have a bottle of the 342 Calibration Solution and sure enough it was off, the problem I am having is that when I turn the calibration screw all the way down I can't get it to read any lower than 370. any ideas?

Thanks
Sam

I should also mention I changed the batteries in it also just for good measure but still no luck, and my handheld meter reads the calibration fluid at 342 like it should be.

BuckeyeFS · 07/14/2012, 04:32 AM

Sam - If you'll PM us your email address we'll send you some detailed instructions. Let's work through those as a first step.

Russ

07/13/2012, 08:30 AM	#1
shifty51008 Registered Member Join Date: Mar 2010 Location: NW Iowa Posts: 3,800	Dual Inline TDS Meter DM-1 HM Digital problems I have had this TDS meter for about 5 years now. after changing all the filters and membrane, I was still getting a reading of 2 on the output of my dual DI. at this point I decided to calibrate the probes, I have a bottle of the 342 Calibration Solution and sure enough it was off, the problem I am having is that when I turn the calibration screw all the way down I can't get it to read any lower than 370. any ideas? Thanks Sam I should also mention I changed the batteries in it also just for good measure but still no luck, and my handheld meter reads the calibration fluid at 342 like it should be. __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, dual 250 watt MH's icecap ballasts, XM 20k's, 2 - 110 watt super atanics, 2-tunze 6000's with a 7095 controller, ranco dual temp controller, MR2 skimmer ran with Mak 4 pump, pinpoint pH monitor, marine magic dual dosing pump, pcx 40 return pump, dual MR5 media reactors for carbon and GFO, purelyH20 optima pro RODI unit w/dual BRS Di unit, aquahub ATO fish/inverts: 2-occ. clowns, 1-banggaii cardinal, 1 tiger tail cuke, 2 RBTA, mix of nass, cerths, and Banded Trochus snails, pair of skunk cleaner shrimp corals: 1 elegance coral, 1-bubble corals, 1 green toadstool leather, 1 green with pruple tip frogspawn, 1 acans, 1 green cap, 2 Chalice

07/14/2012, 04:32 AM	#2
BuckeyeFS RC Sponsor Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,271	Sam - If you'll PM us your email address we'll send you some detailed instructions. Let's work through those as a first step. Russ __________________ Have you visited Buckeye recently? GFO (pellet, granular, and HC), VorTech pumps, refractometers, 2-part additives, ROX 0.8 GAC, and more! Reef Central S P O N S O R RO/DI Systems and Supplies at www.BuckeyeFieldSupply.com [email protected] HM Digital Master Distributor Hanna Instruments Master Distributor Salifert Master Distributor AQUA UV Master Distributor Current Tank Info: 300 g mixed reef system