Intrinsic Safety Barriers Suitable for Use With Delta Controls Pressure and Level Transmitters
Delta Controls pressure transmitters are intrinsically safe when used with suitable safety barriers. Barriers to a safe area are suitable if the entity parameters are selected so that:
- 13v < Vmax < 35v
- 20mA < Imax < 180mA
- Ca > .03uF+Ccable
- La > Lcable
In addition, the internal resistance must be selected so that at 20mA, the voltage dropped across the load resistance plus the internal resistance must be less than (Vsupply-13v)
The following are some of the safety barriers that are suitable for use with Delta Controls pressure transmitters:
| MANUFACTURER: STAHL | ||||
|---|---|---|---|---|
| PART NUMBER | RATED VOLTAGE | INTERNAL RESISTANCE | ALLOWABLE LOAD RESISTANCE AT RATED VOLTAGE | I.S. CONNECTION FOR CL I,II,III, GROUPS: |
| 9001/01-199-150-10 | 16 | 160 | 10 | A-G |
| 9001/01-280-075-10 | 24 | 440 | 110 | A-G |
| 9001/01-280-085-10 | 24 | 356 | 194 | A-G |
| 9001/01-280-100-10 | 24 | 302 | 248 | A-G |
| 9001/01-280-110-10 | 24 | 277 | 273 | A-G |
| 9001/01-199-165-10 | 24 | 187 | 363 | C-G |
| MANUFACTURER: CROUSE-HINDS | ||||
|---|---|---|---|---|
| PART NUMBER | RATED VOLTAGE | INTERNAL RESISTANCE | ALLOWABLE LOAD RESISTANCE AT RATED VOLTAGE | I.S. CONNECTION FOR CL I,II,III, GROUPS: |
| SB19130 M 1801 | 18 | 230 | 20 | A-G |
| SB19130 M 2401 | 24 | 440 | 110 | A-G |
| SB19130 M 2402 | 24 | 535 | 15 | A-G |
| MANUFACTURER: ADALET | ||||
|---|---|---|---|---|
| PART NUMBER | RATED VOLTAGE | INTERNAL RESISTANCE | ALLOWABLE LOAD RESISTANCE AT RATED VOLTAGE | I.S. CONNECTION FOR CL I,II,III, GROUPS: |
| Z 125/Ex | 22 | 202 | 133 | A-G |
| Z 129/Ex | 28 | 367 | 258 | A-G |
| Z 123/Ex-CL | 20 | 178+2V | 72 | A-G |
| Z 129/Ex-CL | 28 | 382+2V | 268 | A-G |
