Handling Of The Zo21S Standard Gas Unit; Standard Gas Unit Component Identification; Installing Gas Cylinders - YOKOGAWA ZR402G User Manual

10.5

Handling of the ZO21S Standard Gas Unit

The following describe how to flow zero and span gases using the ZO21S Standard Gas
Unit. Operate the ZO21S Standard Gas Unit, for calibrating a system classified as System 1,
according to the procedures that follow.
10.5.1

Standard Gas Unit Component Identification

Carrying case
Flow checker
Checks the zero and
span gas flow.
Span gas valve
Controls the span gas (air) flow.
Zero gas valve regulator
Tube connection
Clamp
Clamps the gas cylinder.
Figure 10.4
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
cylinder) and nitrogen, at a pressure of 700 kPaG (at 35°C).
The operating details and handling precautions are also printed on the product. Please read them
beforehand.
Pump
Supplies span gas (air)
Power cord
Applies the power to operate the
pump to supply the span gas.
Standard Gas Unit Component Identification
<10. Other Functions>
Cover screws (six pcs.)
Gas cylinder
Contains the zero gas. A gas
of 7 Nl is charged to 700 kPa
Zero gas valve
Attaches to the gas
cylinder for use.
(concentration varies with each
2
IM 11M12A01-04E
10-21
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11th Edition : Jul. 19, 2017-00