Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 196)

IM 11M12A01-03E 12-12
CAUTION
• Measure the thermocouple resistance value after the difference between the detector
tip temperature and ambient temperature falls to 50
Њ C or less. If the thermocouple
voltage is large, accurate measurement cannot be achieved.
(3) If the thermocouple is normal, check whether or not the wiring cable is broken or
shorted out, and also whether the wiring cable is securely connected to the terminals.
Also check that the wiring resistance between the converter and the detector is 10
⍀
or less.
(4) If there is no failure in the wiring, the electrical circuits inside the converter may
possibly fail. Contact the service personnel at Yokogawa Electric Corporation.
12.2.2.8 Alarm 12: Input Current Alarm
When “mA-input” is selected in the Exhaust gas setup display, this alarm
occurs if the current input from the temperature transmitter goes outside
he range from 3.2 to 21.6 mA.
If this alarm occurs simultaneously with Alarm 9: Exhaust Gas
Temperature Alarm, first solve the problem for Alarm 9. If Alarm 12 occurs
independently, the cable connection between this equipment and the
temperature transmitter may be improper (disconnected).
<Locating cause of failure, and countermeasures>
(1) Check that cable connections (including connecting lugs) are proper.
(2) If the cable connections are correct, display the exhaust gas temperature and check
that it matches the temperature transmitter’s temperature signals. If mismatched,
check whether the transmitter output range meets the Exhaust gas setup of this
equipment.
(3) If the range setting is correct, the analyzer electronics may be defective. In such a
case, contact your local Yokogawa service or sales representative.
12.2.2.9 Alarm 13: Battery low Alarm
An internal battery is used as backup for the clock. After this alarm occurs, removing
power from the instrument may cause the clock to stop but should not affect stored
parameters. The internal clock is used for blowback scheduling; if you use this then after
a battery alarm occurs (until the battery is replaced) be sure to check / correct the date
and time every time you turn on the power.
<Corrective action>
When the battery low alarm occurs, remember that the battery cannot be replaced by the
user. Contact your Yokogawa service representative.
Note
Battery life varies with environmental conditions.
* If power is applied to the instrument continuously, then the battery should not run
down, and life is typically about ten years. However the battery will be used during
the time interval between shipment from the factory and installation.
* If power is not applied to the instrument, at normal room temperatures of 20 to 25
Њ C
then battery life is typically 5 years, and outside this range but within the range -30 to
+70
Њ C then battery life is typically 1 year.