Repair, maintenance and servicing
6.2 Sensor module
OXYMAT 64
106 Operating Instructions, 06/2008, A5E00880383-03
6.2.3 Installation/retrofitting of pressure regulator
If a pressure regulator has to be replaced or retrofitted, proceed as follows:
1. Remove sensor module
2. Mount the pressure regulator onto the sloping upright plate of the metal bracket using two
M5 screws.
3. Reinstall the sensor module.
4. Fit the supplied capillary tube (without restrictor) between the sample gas inlet coupling
and the gas inlet of the pressure regulator.
5. Fit the supplied capillary tube with restrictor between the input of the T-piece present on
the O
2
sensor and the output of the pressure controller.
6. Carry out a leak test as described in Section 'Commissioning and operation'.
7. Apply a sample gas pressure (> 0.2 MPa) and turn the screw of the pressure controller
until the cone floats in the flowmeter tube. Then adjust the setpoint flow (125 ml/min)
using the bypass restrictor.
Note
Make sure that none of the small parts (gasket cone, sleeve, pressure piece, union nut)
are lost when fitting the capillary tube. In addition, do not overtighten the union nut,
otherwise the gasket (PTFE) will be permanently deformed and lose its sealing function.
See also
Leak test (Page 39)
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