Figure 48: Alarm condition indicated (Sensor) ....................................................................................................... 70

Figure 49: Operator menu, diagnostics screen ...................................................................................................... 70

Figure 50: Sensor alarm detail screen ................................................................................................................... 70

Figure 51: Transmitter power connections ............................................................................................................. 74

Figure 52: RS-485 communication wiring .............................................................................................................. 77

Figure 53: HMI display .......................................................................................................................................... 79

Figure 54: DIP switches ........................................................................................................................................ 84

Figure 55: Steam or clean liquid flow measurement (transmitter and manifold) ...................................................... 95

Figure 56: Level measurement on a closed tank with dry leg ................................................................................. 96

Figure 57: Level measurement on a closed tank with wet leg ................................................................................. 97

Figure 58: Examples of gas and dust application zone separations........................................................................ 99

List of Tables

Table 1: Transmitter subassemblies ........................................................................................................................ 6

Table 2: 266 Transmitter specifications ................................................................................................................... 7

Table 3: Differential pressure specifications ............................................................................................................. 9

Table 4: Static pressure specifications..................................................................................................................... 9

Table 5: RTD input specifications .......................................................................................................................... 10

Table 6: RTD element errors ................................................................................................................................. 10

Table 7: MODBUS

RTU message frame format ................................................................................................... 11

Table 8: Bit sequence in RTU mode (with parity checking) .................................................................................... 13

Table 9: Bit sequence in RTU mode (with no parity) .............................................................................................. 13

Table 10: Pre-installation checklist ........................................................................................................................ 16

Table 11: Model number configuration................................................................................................................... 18

Table 12: Communication parameters ................................................................................................................... 36

Table 13: Replacement parts list ........................................................................................................................... 44

Table 14: Calibration menu ................................................................................................................................... 59

Table 15: Device menu ......................................................................................................................................... 65

Table 16: Diagnostic code cause and action .......................................................................................................... 71

Table 17: Communication parameters ................................................................................................................... 76

Table 18: HMI menu structure ............................................................................................................................... 80

Table 19: DIP switch states ................................................................................................................................... 85

Table 20: ABB transmitter register map ................................................................................................................. 86

Table 21: Rosemont MODBUS

Table 22: Temperature class definitions .............................................................................................................. 102

Table of Contents