Yokogawa EXA DC402 Dual-Channel Conductivity Analyzer - Manual (Page 49)

IM 12D08E02-01E
5-24 Parameter setting
5-3-6. User interface
Code 50 *RET. When Auto return is enabled, the converter reverts to the measuring mode
from anywhere in the configuration menus, when no button is pressed during
the set time interval of 10 minutes.
Code 51 *MODE The adjustment of the contact setpoints can be setup for operation in the
maintenance mode. (Through the closed front cover).
Code 52 *PASS Passcodes can be set on any or all of the access levels, to restrict access to
the instrument configuration.
Code 53 *Err01 Error message configuration. Two different types of failure mode can be set.
Hard fail gives a steady FAIL flag in the display, and a continuous contact
closure. All the other contacts (controls) are inhibited (except HOLD contacts),
and a Fail signal is transmitted on the outputs when enabled in code 32.
Soft fail gives a flashing FAIL flag in the display, and the relay contacts are
pulsed. The other contacts (controls) are still functional, and the controller
continues to work normally. The call for maintenance is a good example of
where a SOFT fail is useful.
*SOFT If set to 1, soft fail gives a flashing FAIL flag in the display and no pulsing
contact.
Code 54 *E5.LIM Limits can be set for shorted and open measurement. Dependent on the main
*E6.LIM parameter chosen in code 01, the EXA will ask for the absolute conductivity/
resistivity (without influence of absolute cell constant or Temp. comp).
Code 55 *% For some applications the measured parameter values may be (more or less)
linear to concentration. For such applications it is not needed to enter an output
table, but 0 and 100% concentration values directly can be set.
Code 56 *DISP The display resolution is default set to autoranging for conductivity reading. If
a fixed display reading is needed, a choice can be made out of 7 possibilities.
For resistivity the default reading is fixed to xx.xx MΩ·cm.
Code 57 *USP Input 1 and/or Input 2 can be set to give automatic checking for compliance
with the water purity standard set in USP <645> (United States Pharmacopea
directive 23). For more detailed description see Appendix 10-8.
Code 58 *CALC A calculation type can be chosen to suit a variety of applications. See appendix
10-9 for more details. For conductivity a choice can be made from 7 options.
For
Resistivity only “differential” or “no calculation” is possible.