1 inspection and maintenance of the detector, 1 cleaning the calibration gas tube, 1 inspection and maintenance of the detector -2 – Yokogawa Integral Oxygen Analyzer ZR202 User Manual

Page 153: 1 cleaning the calibration gas tube -2

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IM 11M12A01-05E

11-2

11.1 Inspection and Maintenance of the Detector

11.1.1 Cleaning the Calibration Gas Tube

The calibration gas, supplied through the calibration gas inlet of the terminal box into
the detector, flows through the tube and comes out at the tip of the probe. The tube
might become clogged with dust from the measurement gas. If you become aware of
clogging, such as when a higher pressure is required to achieve a specified flow rate,
clean the calibration gas tube.

To clean the tube, follow these steps:
(1) Remove the detector from the installation assembly.
(2) Following Section 11.1.2, later in this manual, remove the four bolts (and associated

spring washers) that tighten the sensor assembly, and the pipe support as well as the
U-shaped pipe with filter.

(3) Use a rod 2 to 2.5 mm in diameter to clean the calibration gas tube inside the probe.

In doing this, keep air flowing from the calibration gas inlet at about 600 ml/min and
insert the rod into the tube (3-mm inside diameter).
However, be careful not to insert the rod deeper than 40 cm.

(4) Clean the U-shaped pipe. The pipe can be rinsed with water. However, it should be

dried out thoroughly before reassembly.

(5) Restore all components you removed for cleaning. Follow Section 11.1.2 to restore

all components in their original positions. Be sure to replace the O-ring(s) with new
ones.

F11.1E.EPS

Calibration gas tube

Exploded view of components

Rod
(with outside diameter
of 2 to 2.5 mm)

Figure 11.1 Cleaning the Calibration Gas Tube

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