Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 189)

IM 11M12A01-03E 12-5
12. Troubleshooting
12.2 Displays and Measures to Take When Alarms are Gen-
erated
12.2.1 What is an Alarm?
When an alarm is generated, the alarm indication blinks in the display to notify of the
alarm (Figure 12.3). Pressing the alarm indication displays a description of the alarm.
Alarms include those shown in Table 12.2.
Tag:
0.0
%H 2 O
4.00mA -Output1
4.00mA -Output2
Hold
F12.3E.EPS
Tag:
Alarm 6 :Zero conc.ratio
F12.4E.EPS
Figure 12.3 Figure 12.4
Table 12.2 Types of Alarms and Reasons for Occurrence
Alarm Type of alarm Reason for occurrence
Alarm 1 Oxygen Occurs when the oxygen concentration to be
concentration alarm measured exceeds or falls below the set alarm points
(refer to Section 8.3, "Alarm Setting").
Alarm 2 Humidity alarm Occurs when the humidity to be measured exceeds or
falls below the set alarm points (refer to Section 8.3,
"Alarm Setting").
Alarm 3 Mixing-ratio alarm Occurs when the mixing ratio to be measured exceeds
or falls below the set alarm points (refer to Section 8.3,
"Alarm Setting").
Alarm 6 Zero-point Occurs when the zero correction factor is out of the
calibration range of 100
Ϯ 30% in automatic and semiautomatic
coefficient alarm calibration (refer to Section 9.1.3, "Compensation").
Alarm 7 Span-point Occurs when the span correction factor is out of the range
calibration of 0 Ϯ 18% in automatic and semiautomatic calibration
coefficient alarm (refer to Section 9.1.3, "Compensation").
Alarm 8 EMF stabilization Occurs when the cell (sensor) voltage is not stabilized
time-up even after the calibration time is up in automatic and
semiautomatic calibration.
Alarm 9 Exhaust gas When "mA-input" is selected in the Exhaust gas setup
temperature alarm display, this alarm occurs if the exhaust gas temperature
exceeds the set alarm values (refer to Section 8.6.3,
"Setting Measurement Gas Temperature and Pressure").
Alarm 10 Cold junction Occurs when temperature of the cold junction placed
emperature alarm in the detector terminal box exceeds 155
ЊC or falls below
-25
ЊC.
Alarm 11 Thermocouple Occurs when thermocouple voltage exceeds 42.1 mV
voltage alarm (about 1020
ЊC) or falls below -5 mV (about -170ЊC).
Alarm 12 Input current alarm When "mA-input" is selected in the Exhaust gas setup
display, this alarm occurs if the input current from
the temperature transmitter is outside from 3.2 to 21.6 mA.
Alarm 13 Battery low alarm Internal battery needs replacement.
T12.2E.EPS