From Jim Mills, EIC
On the matter of ammonia sensing/monitoring. As Ammonia is notoriously difficult to transport in sample lines without significant losses and memory effects due to its “sticky” nature it may be worth considering open path optical sensing. Tuneable Diode Laser (TDL) systems can measure down to around 50-100ppb with path-lengths of just 10m (5m physically between transmitter and detector) The atmosphere inside animal houses could be monitored directly without the need for complex multi-point heated sampling systems. The longer the path-length (up to around 100m) the better the D.L.
If anyone is interested, I would be happy to discuss further and possibly help facilitate a project.