Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 48)

IM 12J05C01-01E
Parameter Setting 5-8
5-3-4. mA output functions
Code 31 *OUTP.F For the DO202 the output may be chosen as linear to input, or configured in a
21 point table to a particular linearization. Enable the table setup in code 31, and
configure the table in code 35.
Code 32 *BURN Diagnostic error messages can signal a problem by sending the output signals
upscale (21 mA) or downscale (3.6 mA when HART comm. non-used, 3.9 mA
when HART comm. used). This is called upscale or downscale burnout, from
the analogy with thermocouple failure signaling of a burned-out or open circuit
sensor. The pulse burnout setting gives a 21 mA signal for the first 30 seconds
of an alarm condition. After the “pulse” the signal returns to normal. This allows a
latching alarm unit to record the error. In the case of the EXA the diagnostics are
extensive and cover the whole range of possible sensor faults.
Note: Burnout downscale can only be selected if the HART communication is turned of in service code 60.
Code 35 *TABLE The table function allows the configuration of an output curve by 21 steps
(intervals of 5%). The following example shows how the table may be configured
to linearize the output with a mA curve.
5-3-5. User interface
Code 50 *RET When Auto return is enabled, the transmitter 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 *P.MAN In Maintenance mode the pressure can be entered (M. PRESS).
*P.%
*P.CAL
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. xx Error message configuration. Two different types of failure mode can be set.
Hard fail gives a steady FAIL flag in the display.
Soft fail gives a flashing FAIL flag in the display. 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.
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 ppm, ppb or % saturation as the main unit, to suit the application.
mA