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Hp hewlett-packard 5970B mass selective detector msd
HP Hewlett-Packard 5970B Mass Selective Detector MSD
* HP .05985-60301 A2619-23 Card
* HP .05970-60205 .A-2716-23 Card
Product Information: The 5970B features system vent, line/pumps and heater/electronics. The rear of the unit has accessory control, remote, HP-IB, purge gas in and J1 start sync ports. Power: 120v, 50/60Hz. The item powers on and appears to be functioning correctly. You can find more information on this unit at: HP Hewlett-Packard 5970B Mass Selective Detector
The MSD is controlled from a workstation which includes a computer, disc drive and printer . Operating software provides a complete set of MSD and CC/MS applications including programs for Tuning, Data Acquisition, Data Retrieval and Reporting .
Installation and 90-day warranty are provided . Operator training is highly recommended . A good understanding of capillary chromatography is also useful
* Mass Selection : Scanning mode-Scans any mass range between 10 aid 800 amu in 0 .1 amu steps . Up to three mass ranges may be selected using time programming .
* Resolution : Unit resolution throughout mass range established automatically under computer control .
* Scan Speed : Eight user-selectable scan rates with a maximum of 1500 amu sec : with 0 .1 amu mass resolution .
* Scanning Acquisition Process : Sample flows from CC into ion source where it is constantly bombarded by 70 eV electrons . causing molecules to fragment and ionize . Positive ions are focused into the quadrupole mass filter by the lens system . An AC 1 .0 MHz voltage and ,t DC voltage are superimposed in an accurately controlled ratio on the quadrupole . The voltages are stepped to allow an ion with a specific m z value to pass through the filter while all others are ,elected, At each quadrupole filter voltage step, the amplified electron multiplier detector output is digitized and read by the Series 200 computer through the GPIO interface . The entire process is operated automatically by the software in the Series 200 computer.
* Sensitivity : Typical performance for 1 ng of methyl stearate yields a signal-to-noise ratio of better than 20 :1 at m z 298 .3 when scanned at 380 amu per second between m, z 290 and 310. :elected
* Dwell Time : User selectable from a minimum of 10 milliseconds per mz value up to a maximum of 32767 milliseconds .
* Selected Ion Monitoring Acquisition Process : Rather than dividing the mass range into 0 .1 m, z increments and recording information at each m, z, a different acquisition process is used for selected ion monitonfig . The quadrupole mass filter is programmed to select a few specific mrz values for measurement, increasing signal'noise by measuring only a few m ; z values rather than scanning large areas with no signal present . Since only a few areas of the total m, z range need to be measured, the CC peak is sampled more often, resulting in more accurate quantitation . Sample flows from the CC into the ion source, and is constantly bombarded by 70 eV electrons, causing the molecules to fragment and ionize Positive ions are focused into the quadrupole mass filter by the lens system, An AC 1 .0 MHz voltage and the DC voltage are superimposed to the correct ratio for the first user-specified m . z value . The amplified electron multiplier detector output is digitized and accumulated for the duration of the user-specified dwell time . After the dwell time period is completed, the accumulated count total is divided by the dwell time and stored . The system steps through the specified m/z values, each is measured for the specified dwell time . At the end of all m/z settings, the process is repeated again beginning from highest m/z value to lowest until the end of the run is reached .
* Sensitivity : Typical performance in selected ion monitoring : 10 pg of methyl stearate when monitoring m z 298.3 for a dwell time of 50 milliseconds, with a 10:1 signal to noise .
* Detector : Continuous dynode electron multiplier . Power supply to the multiplier is computer controlled . Maximum voltage is 3000 volts, settable in 200 volt increments .
* Ion Source : Electron impact source with electron energy of 70 eV . Two filaments are selectable to allow continued operation in the event of filament failure . Complete source is removable as an assembly for convenient cleaning .
* Mass Filter : Quadrupole mass filter consists of four molybdenum rods, 203 mm long, precisely formed to a hyperbolic shape .
* Dynamic Range : An FET logarithmic preamplifier provides five decades of dynamic range .
* Mass Axis Stablitity : 0 .5 amu in 8 hours .
* Vacuum System: Analyzer vacuum is maintained by an aircooled turbomolecular pump backed by a two-stage direct drive mechanical pump. Overall system pumping speed is approximately 60 liters per second for helium . Vacuum system can accommodate a capillary flow rate of 1 .0 atm cc per minute of helium . Pump-down from for venting to) atmosphere requires approximately 10 minutes . Time to reach operating temperature for cool down for venting) is approximately one hour. Optional ion gauge controller monitors pressure in the high vacuum chamber up to I X 10 5 torr. Typical chamber pressure is 5 X 10'5 torr at 0 .5 ccrmin . of helium .
* Safety Features : Automatic interrupt system provides protection against damage due to excess ion source pressure or electron multiplier output current, as well as filament or RFPA failure . In addition, analyzer temperature zone and operating voltages are interlocked with turbopump speed to prevent instrument damage due to operation at excess source pressure . An elapsed time clock indicates service interval time for turbopump preventative maintenance ,
* Temperature Control : Ion source'analyzer temperature is controlled by a fixed temperature thermostatic controller, Ion source temperature is maintained at about 180-250 C . Interface temperature is controlled by the gas chromatograph through the auxiliary zone controller or through a detector zone controller . Other external temperature control is also possible .
* Pfeiffer Balzers P/N PMP0135
* Turbomolecular Pump Information
