Varec, Inc. 71
Lubrication
Caution Do Not use any type of grease, WD-40, or lithium-based lubricant.
Warning Before lubrication, ensure the chemical compatibility of the lubricant with the
product in the tank.
Lubricate the moving parts of the gauge head at regular intervals with a silicone or Teflon
®
aerosol lubricant.
Other Lubricants Recommended for General Service
Use a low-pour-point, food grade, water-white, mineral oil.
Other Lubricants for Service below 25°F (-4°C)
The following lubricants may be used for service below 25°F (-4°C):
• Antifreeze and water, 50/50 mix
Warning Antifreeze must be compatible with aluminum.
Caution These oils may not be compatible with edible oils and potable liquids. Use
product-compatible substitutes for tanks holding products for human or animal
consumption or products that may react chemically with the oil.
Oil-Filled Gauge Check
Caution Gauges measuring caustic liquids require that the gauge head be oil filled.
Check that the oil is not leaking and change the oil at regular intervals. Dispose of the old oil
according to local environmental regulations.
Oil filling the gauge head is highly recommended to protect the internal parts from possible
corrosion attack by product vapors. Oil filling also provides lubrication for the moving parts
and could extend service intervals and overall gauge head life.
Fill the gauge head through the top 1/2”-NPT plug. Approximately 4.75 quarts (4.5 liters) of oil
are required.To fill the counter assembly with oil, it is necessary to change the bottom NPT
condensate drain plug. Replace it with a solid 1/4”-NPT plug or reverse the top solid plug with
the bottom plug. Fill the hole in the condensate drain plug with Dow Corning
®
RTV 737 sealant.
The counter assembly will hold approximately 1.06 quarts (1.0 liter).
The appropriate oil selected for lubrication may also be used in conduit oil seal units.
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