YOKOGAWA ZR202S, User Manual, Page: 149 / 163

<12. Troubleshooting>
12-8
IM 11M13A01-04E
CAUTION
• Measure the thermocouple resistance value after the difference between the probe tip
temperature and the ambient temperature decreases to 50°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 Ω 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.
AL-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 calibration and purge 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°C then battery
life is typically 5 years, and outside this range but within the range -30 to +70°C then battery life
is typically 1 year.