Vici D-2-I Manual de usuario

Valco Instruments Co. Inc.Pulsed Discharge Detector Models D-2 and D-2-I Instruction Manual Rev 2/14 Valco Instruments Co. Inc.800 · 367· 8424 sales

6IntroductionPDECDPDHIDMODE120160200804024028032036040010245122561286432168421ATTENUATIONDETECTOR TEMP.DISCHARGEZEROV ECDnA HIDPULSED DISCHARGE CONTRO

7TEMPERATURE control and indicator Sets the temperature (°C) of the detector heater block. The indicator is steadily on when maximum power is being a

8Display Indicates standing current in the PDHID mode or bias voltage in the PDECD mode, auto-scaled to the most suitable range. In the un-zeroed PDH

9IntroductionSpecicationsMains (line): 115/230 V~50/60 Hz, 175 VA Fuse: 2 A, time-delay, 5 x 20 mm Pressure: 6.9 kPa (1 psi) operating, 6.9

10System RequirementsComponents Not Included with the Detector System • Helium (99.999% purity) and other support gases • Ultra high purity grade ga

11System RequirementsGas SpecicationsFor Model D-2Detector ModePDECD PDHID Ar-PDPID Kr-PDPID Xe-PDPID Discharge gasHelium Helium 2% Ar in He 1.5% Kr

12GC Column SelectionTo prevent detector contamination, we strongly recom-mend disconnecting the column from the detector dur-ing column bakeout proce

13InstallationThe detector is usually mounted on top of the GC column oven. The cabling as supplied requires the discharge module to be located withi

14Horizontal MountingSome older GCs have access to the column oven through the side of the GC. This does not present a problem as far as operation of

15Installing and Purging the Gas Regulator1. Make sure the on/off valve on the helium cylinder is completely closed. Screw the CGA fitting nut of the

This page intentionally left blank for printing purposes

16Installing and Purging the Helium Purier1. If the pressure regulator has a 1/8" male cone-type outlet port, install the Valco 1/8" exter

17Column ConnectionThe following applies only to systems with the PD-D2 detector. On the PD-D2-IS detector, the column is connected to the column in

18ECD Mode0.00.53.51.01.52.02.53.0Peak height (nA)Length of column in detector (cm)9.2 9.4 9.6 10.84.09.8 10.0 10.2 10.4 10.6Detector temperature: 50

19InstallationElectrical ConnectionsCAUTION: Do not use a wrench to tighten the SMC connectors on the bias and electrometer cables. Connections sho

20InstallationInitial Power-UpNOTE: 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

21InstallationTroubleshooting High Background CurrentIf the background current does not drop below 2 nA even after a 12 hour bakeout, there is either

22Column Bakeout PrecautionsTo prevent detector contamination, we strongly recommend disconnecting the column from the detector during column bakeout

23Mode Selection and SetupHelium Ionization ModeSince the PDHID mode provides a better indication of the cleanliness and the integrity (leak tightness

24Mode Selection and Setupamounts of pure helium and pure dopant through a tee. Since all gas streams must pass through a Valco purifier, the second o

25Electron Capture Mode (PD-D2 only)Since the PDHID mode provides a better indication of the cleanliness and the integrity (leak-tightness) of the sys

Table of ContentsIntroduction Description and Operating Principles ...1 Safety Notes an

2610. If the bias voltage is not 1 V or less with a set current of 10 nA, the dopant flow rate may need to be adjusted. The optimum flow rate is de

27ECD ModeDetector temperature: 50 CDischarge gas flow-rate: 32 mL/min0.1Background bias voltage V0 (V)Dopant Flow-rate (3% Xe, mL/min)0.0 7.01011.0 2

2801.8Bias voltage V0 (V)Detector temperature (C)050 100 150 200 250 300 3500.20.40.60.81.01.21.41.6061Peak height (V)050 3502345Detector temperature

29Appendix: PD-C2 Controller (shipping February 2014)If you have been directed to this part of the manual, you are probably replacing an older PD-C2

30UNATTENUATED OUTPUTS Normally connected to a data acquisition system or other recording means. The two unattenuated outputs are 0 - 10V full scale

31  

32WarrantyThis Limited Warranty gives the Buyer specific legal rights, and a Buyer may also have other rights that vary from state to state. For a per

33Detector Performance LogIn addition to the occasions indicated in the Comments area of the table below, (see Initial Power-Up, page 20), the standin

This page intentionally left blank for printing purposes

1IntroductionNOTE: The contents of this manual apply to either the HID/ECD dual mode detection system (D-2) or the HID single mode detection system (

2Helium Ionization (PDHID)The PDHID is essentially non-destructive (0.01 - 0.1% ionization) and highly sensitive. The response to organic compounds i

3dynamic range whereas, in the D-2, a unique system of feedback to the bias electrode is employed. It operates by comparing the detector output curre

4mains (line) plug shall only be inserted in a socket outlet provided with a protective earth contact. The protective action must not be negated by t

5Description Quantity Product numberDetector cell, PDHID 1 PD-D2-ISPulse supply module 1 PD-M2 Includes:Cable, contr