Reading ammonia levels

[Titleist]

So before I start doing a massive water change, what exactly does "2 ppm" of ammonia look like in decimal form? The reason I ask is because if I used ammonium chloride at a specific rate per gallon in my tank I should be seeing the famed "2 ppm" or close to it immediately after dosing.

On the device I'm using the immediate value shown was 0.073 ppm which if the ammonium chloride solution was prepared correctly I should be seeing 2 ppm not 0.073.

So I've also seen rarely people refer to this value as ".02" which if they meant ppm they would be incorrect as 2.0 is 2, not .02 which is two hundredths.

Can someone clear this up so I can either redose or get going on a water change if in fact I'm really sitting at "7" ppm?

 

[Randy Holmes-Farley]

2 ppm is 2.0 ppm in decimal form.

 

[Titleist]

well that's what simple math would say. I hate to bring brands into this but I can't explain without mentioning two I've mentioned elsewhere. I have a total volume tank of 200 gallons. I put in 16oz tims bacteria, I added the 4 drop per gallon dosage of ammonia. I had a seneye slide wetted for days in this tank before adding ammonia. Immediately after adding the 4 drop per gallon ammonia in total, the highest the seneye ever read was 0.073, matter of fact couple days later and it's still there. It did go down a bit, but after putting the meter in RO water to see what happened and putting it back in the DT it went up to 0.73 and is sitting there without adding any more ammonia. I did see some post on another board where the poster equated .02 with "2 ppm" but that was the only time.

The seneye slide or device must be way off then?