Yokogawa EXA SC202 2-Wire Conductivity Transmitter/Analyzer - Manual (Page 77)

IM 12D08B02-01E
Appendix 1-3
11-4. Sensor Selection
11-4-1. General
The inputs of the EXA transmitter are freely programmable for ease of installation. Standard 2-electrode
type sensors with a cell constant of 0.100/cm and a Pt1000 temperature sensor, need no special pro-
gramming. The EXA indicates a fault with a signal in the display field if there is a mismatch of sensors in
the connection.
11-4-2. Sensor selection
The EXA SC202 is pre/programmed to accept standard 2-electrode sensors with a Pt1000 temperature
sensor. The EXA is universally compatible with all 2- and 4-electrode type of sensors with a cell constant
within the range of 0.008/cm to 50.0/cm.
11-4-3. Selecting a temperature sensor
The EXA SC202 reaches its highest accuracy when used with a Pt1000 temperature sensor. This may
influence the choice of the conductivity/resistivity sensor, as in most cases the temperature sensor is
integrated in the conductivity/resistivity sensor.
11-5. Setup for other functions
• Current Outputs
Transmission signals for the measured parameters can be set up in service codes 30-39.
• Diagnostic checks
Polarization check and checks on the calibrated cell constant and the adjusted Temperature
Coefficient, are included in the EXA SC202.
• Communications
The proprietary HART® communication link allows remote configuration and data retrieval through
the PC202 communication package. This is an excellent tool for the maintenance engineer, quality
engineer or plant manager. Service codes 60 - 69 are used to set up the communications.
• Logbook
In combination with the communications link, a “logbook” is available to keep an electronic record of
events such as error messages, calibrations and programmed data changes. By reference to this log,
users can for instance easily determine maintenance or replacement schedules.
Note:
On the pages Appendix 1-4 & 1-5 a reference list for the configuration of the SC202 is shown.
mA
mA