72
Maintenance
9.1.3 Maintaining Desiccant Cartridges and Desiccant
The desiccant cartridges are located on the right side of the case on bubbler units and
are connected to the reference and intake ports. They keep the air that is used by the
bubbler system dry. The desiccant material in the tubes remove moisture from the air.
Eventually the desiccant becomes saturated and needs to be replaced. The desiccant
material contains tiny blue beads that will turn pink when saturated. When the beads turn
pink, either replace the dryer tubes (P/N 5027), replace the desiccant (P/N 3624), and
membrane (P/N 3390) or rejuvenate the desiccant as described in section
Moisture in the reference port and intake lines can damage the mechanical components
of the bubbler system. Maintaining the desiccant in both dryer tubes will greatly prolong
the life of the bubbler system in the 950 Flow Meter.
9.1.3.1 Replacing the Desiccant
1.
Remove the desiccant cartridges by pulling them out of their clips.
2.
Remove the end caps and dump out the old desiccant.
3.
Replace the white hydrophobic filter membrane (P/N 3390) in each end cap. The dull
side of the membrane must face into the incoming air flow.
4.
Pour new desiccant into the tubes and replace the end caps.
5.
Snap both dryer tubes back into their clips.
9.1.3.2 Rejuvenating the Desiccant
Remove the beads from the cartridge and heat in an oven at 100 to 180 °C (212 to 350
°F), until the beads turn blue again. If the beads do not turn blue, replace them with new
desiccant.
9.1.3.3 Maintaining the Hydrophobic Membrane
When checking or changing the desiccant in the external desiccant cartridge, check the
white hydrophobic filter membrane in the ends of the desiccant cartridges and replace as
necessary. These membranes keep liquid out of the cartridge while still allowing air into
the cartridge. If the membrane becomes plugged, the flow meter will not read accurately
and may display error messages. Each cartridge contains one membrane. The
membrane is located in the threaded fitting at the top of the cartridge. If these
membranes are any other color then white, replace the membrane.
9.2 Upgrades, Repairs, General Maintenance
Only a qualified technician should service the 950 Flow Meter. For example, steps that
require knowledge of CMOS electrostatic discharge precautions and advanced
electronics training and should only be performed by a qualified technician. If you need
assistance in performing any of the following service steps, please contact the
manufacturer.
Electrostatic Discharge (ESD) Considerations
To minimize hazards
and ESD risks,
maintenance
procedures not
requiring power to
the analyzer should
be performed with
power removed.
Delicate internal electronic components can be damaged by static electricity, resulting in
degraded instrument performance or eventual failure.
The manufacturer recommends taking the following steps to prevent ESD damage to
your instrument:
•
Before touching any instrument electronic components (such as printed circuit cards
and the components on them) discharge static electricity from your body. This can be
Summary of Contents for Sigma 950
Page 2: ......
Page 6: ...4...
Page 20: ...18 Introduction...
Page 34: ...32 Basic Programming Setup...
Page 50: ...48 Sensor Installation...
Page 82: ...80 Maintenance...
Page 83: ...81 Appendix A Program Flow Charts Figure 22 Overview of Basic Program Menus...
Page 84: ...82 Program Flow Charts Figure 23 Setup Flow Chart...
Page 85: ...83 Program Flow Charts Figure 24 Options Flow Chart...
Page 86: ...84 Program Flow Charts Figure 25 Alarms Menus Flow Chart...
Page 87: ...85 Program Flow Charts Figure 26 Calibration Menus Flow Chart Page 1...
Page 88: ...86 Program Flow Charts...
Page 102: ...100 Programming Features...
Page 106: ...104 Primary Devices Head Measurement Locations...
Page 126: ...124 SCADA Modbus System Guidelines...