IM 12D08N04-01E
5-28
5. Parameter Setting
5-3-6. User interface
Code 50
*RET.
When Auto Return is enabled, the converter reverts to measuring mode from
anywhere in the configuration menus, when no keystroke is made for 10 min
even though HOLD is activated with HOLD function enabled.
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. A good example is a control time-out for a soft
fail. A warning that the regular maintenance is due, should not shut down the
whole measurement.
*SOFT
If soft set to 1, Soft fail only gives a flashing FAIL flag in the display and no
pulsing contact
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. The value to be set is the uncompensated
conductivity/resisitivity value. The value is an absolute conductivity - so
multiply by cell constant for specific conductivity.
Example:
E5 500 mS * 10cm
-1
= 5 S/cm
E6 1
µ
S/cm x 0.001 cm
-1
= 0.01
µ
S/cm
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 M
Ω
.cm.
Code 57
*USP
Automatic checking for compliance with the water purity standard set in USP
Item 645 (United States Pharmacopoeia directive 23). For more detailed de-
scription see chapter 10-6 of the Appendix in the back of this manual.
