Yokogawa Low Concentration (ppm) Zirconia Oxygen Analyzer OX400 - Manual (Page 5)

iv
IM 11M10B01-01E
• When opening the cover to replace the sensor, turn off the power switch, remove the power plug
from the socket, and wait for 1.5 hours or more before opening the cover.
• Before connecting wires to the terminal block on the rear panel of the OX400, remove the power
plug from the socket in order to prevent electric shock. After finishing the wiring, secure the
removed special terminal cover with screws.
• The OX400 is a measuring instrument intended to be installed indoors, so do not install it in a
location that is exposed to direct sunlight, rain, and wind.
• Do not use the OX400 in a location that may be subject to vibrations and impact. Doing so may
cause destruction and damage to the internal sensor.
• Do not apply a pressure of 30 kPaG or more to the gas inlet. Doing so may cause destruction of
the suction pump and damage to the sensor. Be sure to reduce the sample gas pressure to the
atmospheric pressure level before introducing the gas.
• Be sure to use metal piping for the gas piping; particularly when handling oxygen concentra-
tion in 1 vol % or less. Use of piping materials such as polyethylene, vinyl, rubber, and plastic
may cause significant errors in measurements because of their large oxygen transmission and
absorption rates.
• The presence of corrosive gas components (H
2
S, SOx, HCl, NH
3
, HF, and the like) or potentially
toxic elements (Si, Sn, Cd, Te, As, P, and the like) in the sample gas may cause deterioration of
the sensor. Be sure to remove them with an activated carbon filter or the like in the previous step
of the OX400 before introducing the gas.
• The presence of combustible gas in the sample gas may cause errors in measurements be-
cause oxygen in the sample gas will be consumed by combustion. Be sure to remove it with a
filter or the like in the step before introducing the sample gas into the OX400.
• Make sure the temperature of the sample gas is 50°C or less.
• Be careful because the presence of water droplets in the sample gas may cause damage to the
sensor.
• Keep the supply gas flow rate and pressure as constant as possible while introducing the gas.
• Keep the sample gas outlet open to the atmosphere during operation. If a gas line must be used
to discharge gas, use a gas line with a connector that has the largest possible diameter in order
to prevent back pressure.
• Do not use the supplied power cord with another device.
• Power cable suffix codes of “-D” can be used in Japan, because another cable doesn’t conform
to PSE marking.