VICI D-2-I - Manual (Page 24)

20
Installation
Initial Power-Up
NOTE: This section refers to the D-2 operating in the HID mode and to the
D-2-I. For instructions on using the D-2 in the ECD mode, see page 25.
However, we recommend that D-2 users test system integrity by proceeding
with the instructions below before switching to the ECD mode.
1. Set the MODE switch on the front of the controller to PDHID.
2. Set the discharge gas flow as specified in on page 16 in the section
entitled “Connecting the Discharge Gas to the Detector”.
CAUTION: Always make sure that discharge gas is flow-
ing before powering up the detector.
3. Apply power to the helium purifier.
4. Turn on the MAINS switch located on the back of the controller.
5. Set the detector temperature to 100°C with the TEMPERATURE
control knob. Allow time for the detector and helium purifier to reach
temperature.
6. Turn on the DISCHARGE switch, located on the front of the controller.
The discharge should start within five minutes. (Once a system has been
up and running, the discharge will start within a few seconds.)
In a clean system, the discharge will have a peach/pink color. A purple
discharge indicates impurities and/or leaks in the discharge gas stream.
7. Check the detector standing/background current, indicated in the LED
DISPLAY on the controller, and record it in the Detector Performance
Log on the last page of this manual. The optimum detector background
current is 0.5 to 1.5 nA. The initial value may be higher, but as the
detector bakes out at its operating temperature, the background current
should decrease to the optimum value.
8. The recommended detector temperature is 20°C above the column
temperature, with a minimum of 100°C. Set the detector to the operating
temperature required for the intended analysis. When the detector has
reached the set temperature, read and record the standing current.
9. Install the column as described on page 17, leaving the oven at ambient
temperature. Start carrier flow, then read and record the standing current.
The difference between this reading and the one previous is the ionization
of the combined impurities in and eluting with the carrier gas. The smaller
the difference, the better the quality of the gas exiting the column.
10. Set the column oven to the temperature required for the intended
analysis. When the oven reaches the set temperature, read and
record the standing current.
The difference from the previous reading is the ionization of the column
bleed. The smaller the difference, the better the column is conditioned.