Signal Conditioning FAQ - RTD Inputs

1. Do you have a temperature differential unit that will measure a difference of 10° C between the two inputs?
Yes, the API 4001 G SA-B, but the two RTDs will require very precise matching (±0.1%) and it would be helpful to know the operating temperature point so the factory can calibrate the unit precisely.

2. We are using an API 4001 G with an input of 0-100°C and output of 0-20 mA. If the input runs above 100°C (say 150°C) what will the output do?
The output will go higher, maybe to 21 mA but then stop there. If the output must remain at about 20 mA and go no higher, then a special clamp circuit can be ordered.

3. Will an API 4000 G work with an input temperature range of 1000 to 2000°F?
Yes, however to utilize the charts for selecting the switch positions in the field, we need to convert °F to °C. This would give 550°C to 1100°C which can be selected from the charts.