Follow the instructions below to view sensor temperatures and pressures.


  1. Remove power to the controls by turning off the breaker switch located on the outside of the control panel
  2. Open the control panel door and toggle the EPROM switch (located under “CAUTION” on the control board) from OPER to CAL
  3. Restore power to the controls with the breaker switch
  4. The display will read “HIT ANY BUTTON”
  5. Using the [arrow] keys, navigate to “SENSOR DIAGS”
  6. Press [ENTER]
  7. You can now navigate between the Chamber, Jacket, and Pressure readings using the [arrow] keys
  8. When done, power OFF the controls again before toggling the EPROM switch back from CAL to OPER

Have a question or having difficulties? Talk to Dave Schall, our PRIMUS sterilizer expert who is here to assist you anytime at 877.679.7800 extension 1212 or email at

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