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To Electricuwe, 4-20ma has been used for longer distance purposes as you noted but from what I have seen it is a fading technology for such purpose. A good 6 wire ratio-metric amplifier can easily be used with cables of 10-40'. Some of our own signal conditioner boards are used with 100-200'...

Would it be easier to use a pressure transducer that did not include a 4-20ma converter? That way you'd build an amplifier to accept the transducers mV output and amplify it to your needs. Should be more accurate rather than converting from an already converted signal.

We use Aeromat relays to switch load cell signal leads. They are rather old, about 10 years and not sure if Aeromat has anything new as a cross reference. If needed I can look up the old part number. We also use COTO 3500 series relays. They are acceptable but not nearly as low EMF results...

What is your primary use for DAS? There are quite a few software/hardware solutions available from numerous vendors.

Gavin, I replied earlier to this msg, but seems it didn't get posted so I'll try again! I work for Interface Inc. in Scottsdale, AZ. We produce a complete load cell calibration system including 20-22bit A/D PC cards which a cell would plug directly into. The system also includes a full...