Hi all,
Sometimes I come across the units of mg/Nm3 for gas concentrations. What I would like to ask is why we need to specify that we are talking about mg per Normal cubic meter? Why not just mg per cubic meter? Whatś that Normal for?
Thanks in advance.
Billy_w
Hello all,
I would like to ask how one can switch on and off a device connected to 220 V using one microprocessor output (5V). I know I should use a relay but can I use only one relay, or a cascade of two relays? Any suggestion for what type of relay I should use?
TIA,
Billy_w