Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 157)

<13. COMMISSIONING OF DO (Dissolved Oxygen)>
13-6
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
mA mA
mA
R(1) R(2) R(1)
F0503_2.ai
Return mA to Sensor1?
Yes
No
Reset redundant system
Sensor 1
Display
Sensor 2
Alive Alive
Alive Alive Alive
Dead Dead
Alive
Sensor 1 is dead.
(automatic)
Repair sensor
Redundant system
restart (manual)
If sensor 1 fails, the
output is automatically
switched to the sensor-2
value.
This display is the
example when
“Redundant” is
selected as a
process parameter.
Even if a fault on the sensor 1 is
recovered automatically after
fault detection, the output will not
be switched back automatically
and the sensor 2 value will
continue to be output.
After repairing sensor 1, reset the backup made
by the redundant system. This enables the
sensor 1 value to be incorporated in the output.
On the Reset redundant system, selection of
“Yes” makes the output return to the output of
the 1st module.
Output setup
mA Output
Configure Hold
Reset redundant
Figure 13.2 Redundant system
Setup
Select one of the output methods: Linear and Table.
Linear: Set the 0% and 100% values.
Table: This allows the configuration of an output curve by 21 points (5% intervals).
(The 0% and 100% values must be entered. For the default values, see Table 13.3)
Table 13.3 Table of Default Values
% 0.000 5.000 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00
Oxygen (mg/L) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00
Oxygen (ppm) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00
Oxygen (ppb) 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
Oxygen (%sat) 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
Temperater (°C) 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 25.5 25.0
% 55.00 60.00 65.00 70.00 75.00 80.00 85.00 90.00 95.00 100.0
Oxygen (mg/L) 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00
Oxygen (ppm) 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00
Oxygen (ppb) 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 100.0
Oxygen (%sat) 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 100.0
Temperater (°C) 27.5 30.0 32.5 35.0 37.5 40.0 42.5 45.0 47.5 50.0
Burn
Select the designated output in case of a fault from among Off, Low, and High. See “13.4 Error
configuration” to set the output.
Off: Output depends on the measured value. (No fixed output is produced.)
Low: Output is fixed to 3.6 mA
High: Output is fixed to 22.0 mA.