116 5977B Series MSD Troubleshooting and Maintenance Manual
4 General Maintenance
To Check the DP Fluid
Materials needed
• Screwdriver, Torx T-20 (8710-1615)
Procedure
1 Remove the analyzer window cover.
2 Vent the MSD.
3 Remove the side cover.
4 Check the DP fluid level. (See Figure 13 on page 117.)
The DP fluid level can be seen through the window below the fan at the
front of the MSD. The DP fluid level should be between the top and bottom
of one of the FULL ranges. There are two sets of marks. Use the HOT marks if
the DP is on and is at its normal operating temperature. Use the COLD
marks if the pump is off and has had time to cool. If the fluid level is below
the bottom of the appropriate range, replace the DP fluid. Do not just add
fluid.
The pump fluid should be clear or almost clear. Dark or cloudy pump fluid
indicates an air leak or excessive heat. If the pump fluid appears dark or
cloudy, replace it. Then, check for an air leak.
The DP fluid should be replaced at least once a year, or more often if the
pump fluid level is low, or if the fluid is dark or cloudy.
Do not remove any other covers. Removing other covers may expose hazardous
voltages.
Keep your hair away from the cooling fan if the MSD is turned on.
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