Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 167)

IM 11M12A01-03E 10-19
10. Other Functions
10.5.2 Installing Gas Cylinders
Each ZO21S Standard Gas Unit comes with six zero-gas cylinders including a spare.
Each gas cylinder contains 7-liters of gas with a 0.95 to 1.0 vol% O
2 (concentration
varies with each cylinder) and nitrogen, at a pressure of 700 kPaG (at 35
ЊC).
The operating details and handling precautions are also printed on the product. Please
read them beforehand.
To install the gas cylinder, follow these steps:
(1) Attach the zero gas valves onto the gas cylinder. First, turn the valve regulator of
the zero gas valves counterclockwise to completely retract the needle at the top from
the gasket surface. Maintaining the valve in this position, screw the valve mounting
into the mouthpiece of the gas cylinder. (If screw connection is proper, you can turn
the screw manually. Do not use any tool.) When the gasket comes in contact with the
mouthpiece of the gas cylinder and you can no longer turn it manually, tighten the
lock nut with a wrench.
(2) Remove the carrying case from the standard gas unit. The case is attached to the
unit with six screws. So, loosen the screws and lift them off.
(3) Slide the gas cylinder through the hole in the back of the unit and connect the tube
(the piping in the unit) to the valve connections. Insert each tube at least 10 mm to
prevent leakage, and secure it using a tube clamp.
(4) Attach the gas cylinder to the case. Extend the valve regulator of the zero gas valves
through the hole in the front panel of the unit and secure the bottom of the cylinder
with the clamp.
(5) Take note of the oxygen concentration of the sealed gas indicated on the gas
cylinder and replace the carrying case. Enter the oxygen concentration of the sealed
gas, following instructions on the converter display. Also check that no piping is
disconnected.
Thus, the work of installing a gas cylinder is completed. However, gases in the cylinders
cannot immediately flow out after these procedures. To discharge the gases, it is
necessary for the needle in the zero gas valves to puncture a hole in the gas cylinder (see
Section 10.5.3).