YOKOGAWA OX400, Руководство пользователя

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<7. Inspection and Maintenance>
7-1
IM 11M10B01-01E
7. Inspection and Maintenance
Routine inspection and maintenance is important to ensure operation of the OX400 in a good
condition. Perform regular inspection and maintenance in accordance with the following
instructions.
7.1 Routine Inspection and Maintenance
(1) Checking readings
Measure calibration gas about once every two to three months and check the readings. If
an error is found with the calibration gas concentration, perform zero-span calibration in the
range you use.
(2) Checking gas flow rate
Regularly check the sensor gas flow rate in order to make sure that the flow rate is 200
± 25 mL/min (a floater should be between upper and lower bar of the 200 mL/min bar on
flowmeter).
(3) Other
Regularly check for signs of malfunction such as strange noises of the pump and fan, or
unusually high temperature of the case.
(4) Replacing the fuse
Be sure to turn off the power of the OX400 and remove
the power plug from the socket before replacing the
fuse. The fuse is installed in the lower part of the power
cord plug on the rear panel of the OX400 (see right
figure). Remove the power cord from the plug, pull the
fuse holder out of the lower part of the plug, replace the
fuse with a new one, and push the fuse holder back in
place. Be sure to replace the old fuse with a correctly
rated one.
If a replaced fuse burns out soon, the circuit is likely to
be defective. Please contact our service department.
7.2 Inspection in the Event of an Error
If an error occurs, the ERR/ALM lamp on the front panel turns on. An error/alarm code is
displayed on the sub-display. If multiple errors occur, codes are displayed in the order of
occurrence.
An error means a malfunction, so the heater is turned off and the measurement is stopped.
When an error occurs, repair is required. On the other hand, an alarm means a warning, so
measurement is continued. An alarm occurring during calibration may invalidate the calibration
depending on the content of the alarm.
The following shows the display and output in the event of an error/alarm.
ERR/ALM
ERR/ALM
Error occurs
LED lamp
Alarm occurs
On
Flashing
Sub-display
Err code
ALM code
[ ErrX ]
[ ALMX ]
FAIL contact DO contact
CLOSE
Closed only
in the event
of “ALM7”
OPEN
OPEN
mA output
Scale-out
by burnout
Measurement
output
Front Panel Rear Panel
Event
Notice
(Note) When burnout function is disabled, the mA output in the event of an error (fail) is “4 mA.”
Furthermore, the mA output during warm-up is also “4 mA.”
FAIL (error) contact and DO (alarm) contact are “OPEN” when the power is OFF.
Fuse Holder
Fuse
8th Edition : Jan. 10, 2019-00