Technical data
Table Of Contents
- Contents
- Introduction
- System Description
- Installation
- Overview
- Step 1: Selecting a Location
- Step 2: Unpack and Inspect the Instrument
- Step 3: Set Up the Vacuum Pump
- Step 4: Connect the Power Cord
- Step 5: Install the Dry Compressed Air or O2 Supply
- Step 6: Install the Signal Output Cables
- Step 7: Install the Dual Plasma Burner
- Step 8: Install the Dual Plasma Controller
- Step 9: Install Column Connections
- Step 10: Install the Transfer Line
- Front Panel Controls and Initial Startup
- Operation
- Maintenance
- Pump Maintenance
- Cleaning the Detector
- Changing the Oil Mist Filter (RV5)
- Reaction Cell Cleaning
- Flow Sensor Calibration
- Detector Sensitivity
- Assembling the Dual Plasma Burner for Component Replacement with the SCD
- Assembling the Dual Plasma Burner for Component Replacement with the NCD
- Tube Replacement for the SCD
- Tube Replacement for the NCD
- Troubleshooting
- Index
32 Operation and Maintenance Manual
Pressure Transducer
Vacuum in the reaction cell is measured using a pressure transducer. The
pressure of the reaction cell can be monitored from the front panel and will
typically range from 5 to 10 torr depending on the type of vacuum pump used,
condition of the chemical (ozone) trap, ceramic tube position and the
condition of the combustion chamber. The range of response is from 0 to 760
torr.
Vacuum Pump
There are two choices of vacuum pumps for the 355 SCD and 255 NCD. A
two-stage, oil-sealed rotary vacuum pump is used to produce an operating
pressure between 3 and 10 torr in the reaction cell. The oil-free Dry Piston
pump produces a vacuum between 5 and 12 torr. All vacuum pumps serve the
same purpose:
Figure 6 255 NCD Right Side View