Conductivity ammonia
Conductivity ammonia
(OP)
Hello!
Who of you knows the conductivity of liquid ammonia (mS/cm)? I don't find anything on the web...It's (I am
) unbelievable.
I need it for the decision whether a certain level switch can be used.
Kind regards
Who of you knows the conductivity of liquid ammonia (mS/cm)? I don't find anything on the web...It's (I am
I need it for the decision whether a certain level switch can be used.
Kind regards





RE: Conductivity ammonia
RE: Conductivity ammonia
Liquefied ammonia will not accumulate static charge, since the electrical conductivity is high.
Electrical Conductivity:
1.3 X 10(7) pS/m (- 79 deg C ) (32); 3 X 10(9) pS/m (commercial) (-35 deg C) (31)
Minimum Ignition Energy:
680 millijoules (32)
The googled info above is from
http://www.intox.org/databank/documents/chemical/ammonia/cie48.htm
I am not familiar with the firm however so you will need confirmation, and probably a few more data points.
Cheers
Steve
RE: Conductivity ammonia
in Langes hand book the resistivity of anhydrous ammonia at -79 oC is 1.3(10-7) ohm-1/cm (this aggres with above).
Its dielectric constant is 22.4.
if I have my unit conversions correct,
at -79 oC the resistivity is 0.76 (10^7) ohm-cm
at -36 oC the resistivity is 0.33(10^5) ohm-cm
this is a pretty high resistivity. as soon as it picks up water, it will plumet.
RE: Conductivity ammonia
30+yrs in engineering convinced me that not every problem
deserves a solution -- often it is better to design around
it.
I would use permanent magnet activated Reed-switch,
e.g. in the middle of a long heatshrink tube.( The magnet
would be mounted on a float)
<nbucska@pcperipherals.com>
RE: Conductivity ammonia
no disagreement about advice regarding avoidance of certain instrument types in this service, but that is not the question
RE: Conductivity ammonia
<nbucska@pcperipherals.com>
RE: Conductivity ammonia
RE: Conductivity ammonia
The measuring method (conductivity) does not seem to be suitable. We haven chosen for liquiphant (stem fork) method.
Kind regards
Virk