Yokogawa EXA DC402 Dual-Channel Conductivity Analyzer - Manual (Page 66)

IM 12D08E02-01E
Appendix 10-3
10-4. Sensor Selection
10-4-1. 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.
10-4-2. Sensor selection
The EXA DC402G 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.
10-4-3. Selecting a temperature sensor
The EXA DC402G 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.
10-5. Setup for other functions
●
Contact Outputs
Alarms, trips and proportional control are all possible with the relay outputs, and the configuration is
by Service codes 40 - 49. In addition, FAIL alarm is available.
●
Current Outputs
Transmission signals for the measured parameters and control signals 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 DC402G.
Note:
On the next page a reference list for the configuration of the DC402G is shown.