YOKOGAWA EXA DO402G, User Manual

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<7. Maintenance>
7-2
IM 12J05D02-01E
7.2 Periodic maintenance for the EXA DO402G
converter
The DO402G converter requires very little periodic maintenance. The housing is sealed to IP65
(NEMA 4X) standards, and remains closed in normal operation. Users are required only to make
sure the front window is kept clean in order to permit a clear view of the display and allow proper
operation of the pushbuttons. If the window becomes soiled, clean it using a soft damp cloth or
soft tissue. To deal with more stubborn stains, a neutral detergent may be used.
NOTE
Never used harsh chemicals or solvents. In the event that the window becomes heavily stained
or scratched, refer to the parts list (Chapter 9) for replacement part numbers.
CAUTION
When you must open the front cover and/or glands, make sure that the seals are clean and
correctly fitted when the unit is reassembled in order to maintain the housing’s weatherproof
integrity against water and water vapor. The DO measurement uses small signal currents and
may otherwise be prone to problems caused by exposure of the circuitry to condensation.
7.3 Fuse Replacement
This section describes how to replace the power supply fuse.
WARNING
• Use only a fuse of the specified current, voltage and type ratings to prevent fire.
• Power to the instrument must be turned off at the external breaker before replacing the fuse.
After replacing the fuse, install a high-voltage shield plate before turning the power on.
• Do not short circuit the fuse holder.
n
Specified Ratings of the Power Supply Fuse
The power supply fuse (recommended fuse) used in the DO402G is as follows.
l
100/115 V AC version
Rated breaking current: 35 A or 10 times the rated current, whichever is greater (low breaking)
Maximum rated voltage: 250 V
Maximum rated current: 200 mA
Compliance:
UL, CSA, VDE, Japan’s Electrical Appliance and material Safety Law
Part number: A1105EF
9th Edition: Aug. 05, 2015-00