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I'm having trouble trying to calibrate a rosemont 3051-S for a small open top tank to output 4-20ma to an analog input card on a PLC. This is for a college project and I don't have much experience with this stuff, so bear with me. The transmitter is hooked to the analog card with a 24v power supply in series. The card has an internal 250 ohm resistor.
I've tried calibrating it with a fluke 745 calibrator and also AMS software so far.
The tank is 28" above the transmitter connected to the high side, and the low side is vented. The transmitter comes calibrated for -250 to 250 inh20. Basically the problem is I'm only using a small portion of that span, and it doesn't seem to let me calibrate a new zero. But I'm not sure I'm doing it correctly.
I made a new LRV of 28.0" and URV of 48.0" which corresponds to the range of water that can be in the tank, but the analog signal changes very little over this range. It's something like 7.9mA at 0% and 8.6ma at 100%. IF I try to re-zero, it gives an error saying the correction is too large?
Even with the LRV and URV I made, the span is still listed as -250 to 250 in H20. Does anyone know where I can get step by step instructions for this?
I've tried calibrating it with a fluke 745 calibrator and also AMS software so far.
The tank is 28" above the transmitter connected to the high side, and the low side is vented. The transmitter comes calibrated for -250 to 250 inh20. Basically the problem is I'm only using a small portion of that span, and it doesn't seem to let me calibrate a new zero. But I'm not sure I'm doing it correctly.
I made a new LRV of 28.0" and URV of 48.0" which corresponds to the range of water that can be in the tank, but the analog signal changes very little over this range. It's something like 7.9mA at 0% and 8.6ma at 100%. IF I try to re-zero, it gives an error saying the correction is too large?
Even with the LRV and URV I made, the span is still listed as -250 to 250 in H20. Does anyone know where I can get step by step instructions for this?