ABB 600T/621 Differential Pressure Transmitter
| Type | Data source | 
|---|---|
| 621D | Product Data Sheet SS 621DGA 1998 | 
Reference Accuracy U(ac)
| Low Turndown | High Turndown | 
|---|---|
| For spans less than 15:1 ± 0.1% of span  | 
For spans from 15:1 to 60:1
 
  | 
Drift (stability) U(d)
± 0.05% of URL for 1 year
Power supply effect U(ps)
± 0.005% of calibrated span per volt change.
Ambient temperature effect U(ac)
For turndown up to 15:1 per 30K
| Zero Error | Span Error | 
![]()  | 
± 0.13% of reading | 

