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Ei-838 External Sampling Pump

Ei-838 External Sampling Pump

Our new lightweight and compact external sampling pump.

*See notes below for doing leakchecks on diaphragm pumps in Method 5 sampling.*

SKU: Ei-838 Categories: ,



  • German-engineered and American-made diaphragm pump
  • Lightweight and compact design
  • Compatible with all Apex Instruments sampling equipment
  • Easy to attach, self-sealing EPDM tubing
  • Fast and knuckle-friendly durable polypropylene shell


Motor: 24 BLDC (Brushless DC) KNF 838 Motor

Measured Flow: 70 LPM (2.5 CFM) at free flow, 21 LPM (0.75 CFM) at 15 inHg

Maximum Vacuum: 25.5 inHg

Weight: 16 lbs, (7.25 kg)

Special Back Half Leak Check Consideration:

For metering systems having diaphragm pumps, the normal leak-check procedure will not detect leakages within the pump. For these cases, the following leak-check procedure is suggested: make a 10-minute calibration run at 0.00035 cubic meters per minute (0.02 cubic feet per minute); at the end of the run, take the difference between the measured wet test meter and the dry gas meter volumes; divide the difference by 10, to get the leak rate. The leak rate should not exceed 0.00057 cubic meters per minute (0.02 cubic feet per minute). [Section No. 3.4.2, Page 5 of 22, Quality Assurance Handbook by EPA, 1980 Version]