Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 62)

IM 12J05D02-01E
5-26 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, and the manual operation of the
wash system can be setup for operation in the maintenance mode. (Through
the closed front cover). In maintenance mode the pressure can be entered
(M. PRESS). If manual pressure is enabled, a warning is given when starting
manual-, water and air calibration.
Code 52 *PASS Passcodes can be set on any or all of the access levels, to restrict access to
the instrument configuration.
Code 53 *Err.04 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. A warning that the regular maintenance is due,
should not be used to shut down the whole measurement. An extra choice is
added for Errors set to Soft Fail. It can be set to LCD + Fail contact (current
situation) or to LCD only.
Code 54 *E12 Overrange alarm, set limit for supersaturation permissible before FAIL alarm is
triggered.
Code 55 *CALL.M Call for maintenance is a contact trigger to signal that the system has been in
service for longer than the set time without calibration. The user can set up to
250 days as a routine service interval.
Code 56 *UNIT Select mg/l, ppm or % saturation as the main unit, to suit the application.