Tekmar - Model 7000HT -Self-Contained Microprocessor Headspace Autosampler

With the 7000HT, chromatographic run time determines the analysis time when used in Constant Heat Time mode. The microprocessor automatically determines when to load and unload samples to and from the 12-position platen heater. Constant Heat Time ensures that each sample is heated for exactly the same amount of time and that no time is wasted waiting for samples to equilibrate. Constant Heat time not only speeds up the analysis but also improves precision.

OPTIMIX is a sample missing system allowing the user to speed up sample equilibrium time in liquid samples. OPTIMIX offers 9 power levels to select from. By agitating liquid samples, equilibrium times are reduced and more samples can be analyzed in less time. OPTIMIX reduces thermal exposure of the sample thus reducing possible breakdown of the analyte.

In Method Optimization Mode the 7000HT analyzes a series of standards, automatically incrementing any time or temperature parameter. Important parameters include equilibration time; equilibration temperature, mixing time, and loop fill time. The 7000HT, with its 50 sample positions, combined with method optimization allows almost complete method optimization overnight.

The 7000HT sample path can be heated up to 300oC. This feature eliminates problems with carryover of many analytes. With a valve and loop system you change the sampling volume by changing the loop. With the valve and loop system running samples that have a higher vial pressure than the column head pressure is not a problem as it is with pressure-balanced systems.

The temperature and pressure conditions are precisely repeated for each sample; this includes the ample equilibration time for each sample. Tekmar`s valve and loop sampling technique provides for exceptional reproducibility, typically better than 1% relative standard deviation.

• OPTIMIX Equilibration System (patent pending, time settable 0.1 to 999.9 minutes, power setting in nine increments. Method Optimization Mode (MOM) whereby successive samples receive incremental changes in method parameter setpoints for time, temperature, or mixing power (requires 7050 Carrousel).
• Independent control of vial pressurization, standby flow rate and column flow rate yields maximum sensitivity, and minimum carryover.
• Silcosteel Tubing option for Highly Reactive Compounds.
• Optional synchronous injection of two samples into a single instrument for maximum sample throughput yields automated analysis of up to 100 samples in half the run time when compared to single injection mode instruments. (Requires cables and dual column/dual detector/dual integrator instrument.)
• Optional Cryofocusing Module to increase sensitivity with capillary columns and to concentrate samples in multiple headspace extractions.
• With Multiple Headspace Extraction (MHE), up to nine extraction steps per sample with intermediate vent, with or without multiple septum puncture, Concentrate or Standard Mode.
• Oil-free, resistance heated 12 sample position platen with variable temperature range from 15°C above ambient to 200°C settable in 1° increments, uniformity ±0.1°C.
• Availability of .1, .25, .5, 1, 2, 3, and 5 mL stainless steel sample loops which are user accessible and easily interchangeable.
• All sample pathways Teflon-free continuously swept 1/16” heated nickel transfer line, variable temperature (ambient +15°C to +250°C), stainless steel sample loops.
• Multi-task, self-contained microprocessor controlled headspace autosampler, which allows the execution of a method while concurrently editing any method parameter.
• The instrument incorporates a card cage design with easily interchangeable slide in/out electronic boards with LEDs for easy diagnostics. Optional two-way instrument interface BCD, RS232 serial communication.
• Headspace Autosampler commercially designed and manufactured in the United States.