Yokogawa EXA SC202 2-Wire Conductivity Transmitter/Analyzer - Manual (Page 88)

IM 12D08B02-01E
2-6 Appendix
12-4-4. Error setting (service code 53)
Code 53 *Err01 to 13 Error
message configuration:
Two different types of failure mode namely, Hard fail and Soft fail can be set.
Hard fail gives a steady FAIL flag in the display. When the distributor PH201G
(Style B) is used and its communication is enabled in Service Code 60, the fail
contact of PH201G (Style B) is closed. A fail signal is transmitted on the mA out-
put when enabled in code 32.
Soft fail gives a flashing FAIL flag in the display. In this case the fail contact of
PH201G (Style B) is not closed. A good example is the dry sensor for a soft fail.
A warning that the regular maintenance is due, may not be required to shut down
the whole measurement.
In addition the hold contact of PH201G (Style B) can be activated as it has noth-
ing to do with the setting of Hard or Soft fail.
12-4-5. E5 and E6 setting (service code 54)
Code 54 *E5.LIM & *E6.LIM
Limits can be set for shorted and open measurement. Dependent on the main
parameter chosen in code 01, the EXA will ask for a resistivity or conductivity value
to be set (value to be set is the uncompensated conductivity/resisitivity value). On
the parameter setting screen, you should ignore the unit such as [/cm] and [.cm].
Example: When E5LIM is 250 mS [/cm] and the detector has a cell constant of 10
cm -1 then 250 mS x 10 cm -1 = 2500 mS/cm.
12-4-6. Communication with PH201G (style B) distributor (service code 60)
This communication is a one-way to PH201G (Style B) distributor, a power supplier for the EXA 202
transmitters.
The PH201G (Style B) receives a current signal (4-20 mA DC) and a digital signal superimposed on the
DC signal.
In other words, the PH201G (Style B) provides a measurement signal, a hold-contact signal and a fail-
contact signal.
The communication with PH201G (Style B) is set in Service code 60.
Code 60 *COM When used with our PH201G (Style B) you can enable or disable contact outputs,
namely, Fail contact and Hold contact. The PH201G (Style B) can output Hold contact
and Fail contact signals. You can set Service Code 53 to "0" for "soft fail" to disable
Fail contact output. When you set Service Code 53 to "1" for "hard fail", set Service
Code 60 to "2.0" to enable Fail contact output of PH201G (Style B), or set Service
Code 60 to "0.1" to disable Fail contact output of PH201G (Style B).
60.eps
Code Display Function Function detail X Y Z Default values
Communication
60 *COMM. Communication Set HART communication Off 0 1.0
Set HART communication On 1 On
Set communication PH201G*B On 2
NA 0
NA 1