YOKOGAWA ZR22S, Руководство пользователя

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<4. Piping>
4-8
IM 11M13A01-02E
4.2.2 Piping for the Calibration Gases
The piping for the calibration gases should be installed between the calibration gas cylinders (or
instrument air source) and the detectors with the ZR40H automatic calibration unit.
Figure 4.7 shows the ZR40H Automatic Calibration Unit piping diagram.
Adjust secondary pressure of both the air set and the zero gas pressure reducing valve so that
these two pressures are approximately the same. The flow rate of zero and span gases (normally
instrument air) are set by a single needle valve.
After installation and wiring, check the calibration contact output (see Subsection 7.11.2), and
adjust zero gas pressure reducing valve and calibration gas needle valve so that zero gas flow is
within the permitted range. Next check span gas calibration contact output and adjust air set so
that span gas flow is within the permitted range.
CHECK
OUT
ZERO GAS IN
To zero gas pressure
reducing valve
AIR IN
Instrument air
Approx.1.5 L/min.
flowmeter
flowmeter
REF
OUT
*Needle valve *
Air set
Solenoid valve
F04-7E.ai
*: Needle valve is supplied as an accessory with flowmeter
Figure 4.7 ZR40H Automatic Calibration Unit piping diagram
If the contact input to the converter is used for the blow back function, prepare blow back piping
according to Subsection 4.2.5.
NOTE
Blow back function means the function to get rid of dust inside a probe in a high temperature
probe adapter by using compressed air, when a high temperature detector is used.
4.2.3 Piping for the Reference Gas
The piping for the reference gas should be installed between the air source (instrument air) and
the detector through flowmeters, needle valves of the ZR40H Automatic Calibration Unit.
• Use stainless steel pipes with 6 O.D. x 4 I.D. mm (or nominal 1/4 inch) or larger inside
diameter for the piping for the reference gas.