Peterphrastus

It is always important to find new sources of lower cost components for automation. If you know of any sources of low cost components such as:

• low voltage solenoid valves with 1/4" NPT
• solid state relays 12 volt DC or 110-220 volt AC outputs
• logic controlled mechanical relays 10-15 amp AC
• peristaltic pumps (10 - 50 ml/minute)
• pH electrodes and/or transmitters 4-20 ma or 0-5 volt
• EC electrodes and/or transmitters 4-20 ma or 0-5 volt
• CO2 sensors and transmitters 4-20 ma or 0-5 volt

Please post the sources here so everyone can benefit from a lower cost option.

Many thanks in advance.