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This is normally OK - assuming the total loop impedance isn't too high1. Can I put in series 250 Ohm to get 1-5V drop, by doing so, will it affect the current loop & accuracy?
Within reason. You need to get the transmitter's data sheet to be sure but as a guideline ...2. A 4-20mA transmitter can drive many receiver , if the +loop voltage is sufficient, am I right?
Yes. If the indicator/controller needs this then an EX barrier (used for explosive area installations) gives the input complete galvanic isolation, these devices need a power supply though!3. Is there any isolated 4-20mA receiver?
At its simplest a 4 to 20mA moving coil meter in the positive rail?4. I need a circuit for "high side" current sensing, can anybody show me?