Sunset Laboratory OCEC Sample Flow Adjustment

Purpose: To set the inlet flow rate to 8 lpm (volumetric – not STP)

Required Tools: Bios – High Cell

Overview: If the Sunset Sample flow is outside 8.0 +/- 0.25 lpm it should be adjusted back to 8.0. This is accomplished by adjusting a needle valve inside the instrument itself. The sample flow adjustment should be carried out during a scheduled filter change if needed.

Install BIOS and measure/adjust sample flow

1. Disconnect the inlet tube from the Sample port on the Sunset instrument and attach the BIOS with the High cell installed.

2. Open the “Filter installation & access port” door,

3. In the Sunset “Semi-continuous Real-time Carbon Analysis” window, in the top center, click (to uncheck) the “Use Sample File Times”

4. Then click “Start Analysis” in the upper right hand corner of the window.

5. You should hear the “Ball Valve” operate and approximately “8.00” should display in the “Sample Flow L/min” field of the “RT1 GAS FLOWS AND ABSOLUTE PRESSURE” window, indicating that the sample flow is on.

6. If the Sample flow is outside 8.00 +/- 0.25 lpm adjust the knurled knob approx 3/8" in diameter that you turn to open or close the valve and set it to 8.00.

7. After the flow is set reattach the inlet tubing and check the flow at the inlet.

Flow adjusting valve located in this area

Restoring analyzer to normal operation

1. In the Sunset “Semi-continuous Real-time Carbon Analysis” window, Click (to check) the “Use Sample File Times”

2. Click “Start Analysis”

3. In the “RT1 Status” window the “Start Collection Time” field will display the start time of the next sample, usually on the hour, every hour.

Finish Up

1. In TrackOps record activity & close the ticket.

2. In the SiteLog record activity.