VICI D-4-I Quick Start
Analytical
Components
Systems
&
Pulsed Discharge Detector
Model D-4-I
Quick Reference Guide
General Precautions:
• Never run the detector without discharge gas. To insure a continuous supply of discharge gas, always
change the gas bottle when it reaches 500 psi.
• Never bake out a column while it is connected to the detector.
• Detector lifetime is shortened in the Ar/Kr PID mode. To maximize detector lifetime, turn off the discharge
power when the GC is not actually analyzing samples.
Gas connections
Detector performance is adversely affected by the
presence of impurities in the gas stream. To minimize
the chance of this occurring:
1. Always use the helium purifier.
2. Never use copper or plastic tubes,
even before the helium pur ifier.
3. Never use flow controllers containing
polymers or lubricant.
4. Never use pipe fittings or teflon tape
downstream of the purifier.
You will need:
• Helium
99.9999% purity (“six nines”)
Air Liquide part number:
• Gas regulator
Ultrahigh purity, with stainless steel
diaphragm
Valco part number:
•
Valco Helium Purifier
(included with the detector system)
Valco part number:
• Stainless steel tubing and
Fittings with gold ferrules
(consult the Valco catalog)
• Restrictor
(included with the detector system)
Valco part number:
ValGas 4
TGA-422-580
HP2
TGA-R-30F60P
VENT
COLUMN
INLET
Leave column inlet
plugged until flow
rate is set. (See
“Initial Power-Up”
on next page.)
DISCHARGE GAS
COLUMN
GAS CHROMATOGRAPH
(99.9999% He)
TGA-R-30F60P
RESTRICTOR
(30 mL/min minimum)
DISCHARGE GAS
INLET
SAMPLE
IN
HELIUM
PURIFIER
VENT
TEE
(ZT1)
Electrical Connections
HIGH
VOLT AGE
PULSER
MODULE
(no connection)
HEATER CABLE
FROM DETECTOR
BIAS-B
ELECTROMETER
BIAS-A
CONTROLLER
(Rear panel)
RECORDER
ATTENUATED
OUTPUT
SHIELD
+
–
RED
BLACK
GREEN
WHITE
Initial Power-Up
Caution:
•
Always make sure that discharge gas is
flowing before heating and powering up
the detector.
1. Before installing the column, set the gas flow to
30 ml/min (measured at the detector vent). Let it
flow for 15 minutes so that all air is purged from the
helium purifier.
2. Plug in the helium purifier.
3. Install the column as illustrated at right.
4. Turn on the MAINS switch on the back of the
controller. Set the MODE switch on the front
panel of the controller to PDHID.
5. Set the detector temperature and allow time for
the detector and helium purifier to reach the set
temperature.
6. Turn on the DISCHARGE switch on the front panel
of the controller.
TO
11.4 cm
TO COMPUTER
OR INTEGRATOR
RED
BLACK
WHITE
GREEN
BROWN
BLUE
ORANGE
YELLOW
COLUMN
INLET
CAPILLARY
COLUMN
ADAPTER
(IZERA1.5)
COLUMN
FERRULE
NUT
CAPILLARY
COLUMN
0 - 10 V
Common
0 - 1 V
Shield
COM
SET
UNATTENUATED
OUTPUT
AUTO
ZERO
9.8 cm
(set at the
factory)
COLUMN
INLET
PACKED
COLUMN
ADAPTER
(I-23642-D4RU)
The discharge should start within five minutes. In a
clean system, the discharge will have a peach/pink color.
A purple discharge indicates leakage or impurities in the
system.
7. Check the standing/background current on the
controller display. Optimum current is 1.0 - 2.5 nA.
PACKED
COLUMN
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