AW T4 20 |
U N I V ER S A L 4 - W I R E , D UA L- I N P U T T R A N SM I T T ER | O I/AW T4 2 0 - EN R E V. B
49
Analog sources and digital input/output sources
Analog sources
Source name*
Description
S1 (to 2)
Measured concentration value for the associated sensor.
Temperature 1 (to 2)
Measured temperature value for the associated sensor.
S1 (to 2) control O/P
Control output – single.
S1 (to 2) control O/P (A)
Control output – dual (acid).
S1 (to 2) control O/P (B)
Control output – dual (base).
Inferred pH
Calculation based on dual 2-electrode conductivity.
Difference
Calculation based on dual 2-electrode conductivity.
Ratio
Calculation based on dual 2-electrode conductivity.
% Passage
Calculation based on dual 2-electrode conductivity.
% Rejection
Calculation based on dual 2-electrode conductivity.
Digital output sources
Source name*
Description
Alarm 1 (to 8) State
Process alarm state (alarm 1 to 8).
S1 (to 2) Failure
The associated sensor is in the failed state – see Appendix A, page 42 for possible causes.
S1 (to 2) Out of Spec.
The associated sensor is out of specification – see Appendix A, page 42 for possible causes.
S1 (to 2) Maintenance
The associated sensor requires maintenance – see Appendix A, page 42 for possible causes.
S1 (to 2) Function Check
The associated sensor requires checking – see Appendix A, page 42 for possible causes.
Tx Failure
The transmitter is in the failed state – see Appendix A, page 42 for possible causes.
Tx Out of Spec.
The transmitter is out of specification – see Appendix A, page 42 for possible causes.
Tx Maintenance
The transmitter requires maintenance – see Appendix A, page 42 for possible causes.
Tx Function Check
The transmitter requires checking – see Appendix A, page 42 for possible causes.
S1 (to 2) Cal in Progress
A calibration is in progress for the associated sensor.
S1 (to 2) Cal Failed
The last calibration has failed for the associated sensor.
S1 (to 2) Clean
A clean is in progress for the associated sensor.
S1 (to 2) control O/P
Control output – single.
S1 (to 2) control O/P (A)
Control output – dual (acid).
S1 (to 2) control O/P (B)
Control output – dual (base).
Inferred pH
Calculation based on dual 2-electrode conductivity.
Difference
Calculation based on dual 2-electrode conductivity.
Ratio
Calculation based on dual 2-electrode conductivity.
% Passage
Calculation based on dual 2-electrode conductivity.
% Rejection
Calculation based on dual 2-electrode conductivity.
Digital input sources
Source name*
Description
S1 (to 2) Hold
The measured concentration for the associated sensor can be held via the digital input.
S1 (to 2) Clean Sequence
Note
. Applicable only to some sensor types. Initiates an automated cleaning sequence.
Note
. It is recommended that a momentary switch is used to start or abort digital input operations and a toggle switch is used for the hold functionality.
To start a digital input operation – hold the momentary switch for a minimum of two seconds; release the switch when the digital input operation starts.
To abort a digital input operation – hold the momentary switch for a minimum of two seconds; release the switch when the digital input operation aborts.
*(2) = maximum number of sensors if multiple sensors are connected.
