The Fluid Metrics COP is a continuous bypass device that installs easily in an auxiliary bypass loop to the compressor’s main oil circuit. A small slipstream of contaminated oil is routed through the COP and purified oil is returned back to the compressor’s air-end using the compressor’s own differential pressure (no pump is required). The COP does not replace the compressor’s standard oil filter or in any way interfere with the functionality of the compressor’s original lubrication system.


The COP was specifically designed for rotary screw air compressors and includes an Installation Kit containing all the accessories needed for a quick and easy installation. Servicing the COP is also quick and easy. The conveniently located oil sample valve makes taking regular oil samples a snap. And, the isolation, vent and drain valves allow users to replace the COP’s cartridges without requiring the compressor to be shut down.


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Installation Kit Included


For quick and easy installation, each COP comes with an Installation Kit specifically developed for rotary screw air compressors. Most users are able to install COPs without any assistance, but if any is needed, Fluid Metrics’ Engineers are available to answer all your questions to ensure proper installation and operation.

COP Industrial Air Compressor Parts:

  • Bracket & Hardware
  • Flow Meter
  • Isolation Valves
  • Oil Sampling Valve
  • Vent Valve
  • Sight Glass
  • Hydraulic Hoses
  • Oil Analysis Kit
  • Installation Manual

About us

Fluid Metrics’ technologies are utilized and endorsed by many of the world’s largest compressor users, and are widely recognized as the best practice in rotary screw air compressor maintenance.

Fluid Metrics, LLC

4514 Chamblee Dunwoody Rd. #252

Dunwoody , GA 30338

Phone: (770) 393-8636

Fax: (770) 393-8631


Viscosity Index ASTM D2270 153
Viscosity, centistokes – cSt
@ 0° F / ‐17.8° C ASTM D445 690 cSt
@ 100° F / 37.8° C ASTM D445 26.9 cSt
@ 104° F / 40° C ASTM D445 24.9 cSt
@ 210° F / 98.9° C ASTM D445 5.2 cSt
@ 212° F / 100° C ASTM D445 5.3 cSt
Pour Point, ° F / ° C ASTM D97 ‐40 / ‐40
Flash Point, (COC) ° F / ° C ASTM D92 470 / 243
Flash Point, (PMCC) ° F / ° C ASTM D93 410 / 210
Copper Strip Corrosion, 3 hrs. @ 212° F / 100° C ASTM D130 1B
Ferrous Metal Corrosion, Rust Test
Distilled Water ASTM D665A Pass
Synthetic Sea Water ASTM D665B Pass
Foam Tendency (Sequence I, II, III) ASTM D892 0 (Nil)
Density, g/cc @ 25° C ASTM D941 0.98
Total Acid Number (TAN), mg KOH/g ASTM D664 0.18
pH Dow Method 7.9

Viscosity – cSt @ 40°C ASTM D445 44.4
Viscosity – cSt @ 100°C ASTM D445 7.3
Viscosity Index ASTM D2270 126
Pour Point – °F / °C ASTM D97 -58 / -50
Flash Point – °F / °C ASTM D92 501 / 261
Demulsibility ASTM D1401 Excellent
Foaming Sequences I, II, III ASTM D892 Nil
Specific Gravity ASTM D1298 0.89
Properties subject to change