ammonia detector in secondary fluid

Hi,
could someone give me some information about ammonia concentration detectors in secondary refrigerants (PG, EG, Temper...)
I have the reference of Beutler in Germany.
I would be very grateful if you could also inform me about good practises for maintaining-controling this installations, like:
-maintenance for plate heat exchangers (ammonia, PG)
-concentration control and props of (EG, Pg...).
-filtration system (by-pass)
- By-pass in heat exchanger secondary fluid side for a circuit cleaning before start up.

...and any other suggestions
Thanks a lot in advance!

Is this system closed-loop on the glycol side? Or are there open top tanks or spray heat exchangers or concentrators or similar involved?

If this loop is closed, most would recommend a refractometer for concentration control; such as:

http://www.misco.com/index.php

http://www.refractometer.com/


For a closed loop kept consistently clean these would be more cost effective than a Specific Gravity Based device, though those will often work even with a high level of contamination in the mix....


http://www.emersonprocess.com/mobrey...s/ps001039.pdf



There are quite a few detectors for dissolved ammonia because of the relative sensitivity of certain wastewater treatment arrangements to the presence of even a tiny amount of ammonia...

http://analyticaltechnology.com/cms/....aspx?tabid=92

Pricey way to get there but full time and none sampling....

There is probably a simple way to rework a glycol makeup tank to sample regularly and do the filtration as well as the measurements....Potentially you would then reduce the ammonia detection topic to an atmosphere monitor sitting above the liquid level of the tank, which appears to permit the use of ammonia detectors based on atmospheric concentration...those devices are a-plenty.

With a little effort, you might even be able to set up a sample and makeup arrangement that would monitor and add inhibitor, like you were dosing a water tank; though that may not be necessary for an active, closed loop system.

This is great! It really shows me where to expand my blog. I think that sometime in the future I might try to write a book to go along with my blog, but we will see…Good post with useful tips and ideas

Thank you, sterl this information will be very helpful

MiniCAll III from GFG is a good option to measure the amount of ammonia in water.

Anybody knows the maximum safe level of ammonia in water?