Gerstel Dynamic Load & Wash

Dynamic Load & Wash

Near Zero Carryover – Fast Cycles and Exceptional Reproducibility.

Mass Spectrometers are continuously being improved and have become so sensitive that carryover is constantly an issue. To meet today’s requirements for fast, clean and reproducible LC/MS injection; GERSTEL is now offering the Dynamic Load and Wash Option (DLW) for the GERSTEL MultiPurpose Sampler MPS.

With this option, the sample is no longer in contact with the syringe but it is aspirated into a holding loop/guard column located in front of the syringe. Even though the syringe acts only as an aspirating and dispensing device, it still provides the excellent reproducibility seen in standard syringe injection systems. After injection, the whole sample path including the valve and the needle is washed with up to 2 different solvents. Micro pumps deliver the required quantity of solvent quickly and reliably. At the end of the injection cycle, all parts which have been in contact with the sample are completely clean. As a result, near-zero carryover is achieved for most components.

DLW benefits:

  • Near zero carryover – Typically less than 0.003%
  • Fast –  Cycle time between injections is less than a minute including cleaning step
  • Maestro control – Intrgrated software control including multiple sample preparation techniques
  • Inert sampling path – No contact with syringe, only PEEK tubing and stainless steel
  • Reproducible – < 1% RSD
  • Two solvent wash – Complete cleaning from the opposite direction of sampling
  • Flexible – New 15,000 psi valve handles both HPLC and UHPLC applications
  • Upgradable – DLW option available for most existing MPS Autosamplers

GERSTEL-DLW Brochure

Product Specifications

Light Source 50 mW diode pumped solid state (DPSS) single-longitudinal-mode laser
Laser Wavelength 532 nm, other wavelengths available upon request
Laser Lifetime > 10,000 hours
Detectors 30 detector channels for multi-angle detection
Detector type Multi-element photodiode array for mobility measurements; Single photon counting module for QELS option
Instrument Options Embedded Quasi-Elastic Light Scattering (QELS)
Cell Options Reusable PEEK flow cell with optical quality windows for aqueous and organic solventsDisposable COC* cell for aqueous and polar organic solvents
Flow Cell Volume 170 μL, excluding tubing
Temperature Range 4 – 70ºC
Electrodes (Replaceable) Platinum-coated electrodes
Molar Mass Range < 5×107 g/mol (Daltons) (dependent on molecular shape model
Size Range 0.2 to 5000 nm, hydrodynamic radius (limited by particle sedimentation, this is typical)
Signal Processing Proprietary demodulation algorithm for efficient optical phase detection
Inputs/Outputs Alarm in, alarm retransmit, and remote start contact closure
Ionic Strength Range 0 – 50 mS/cm (4 times the conductivity of physiological saline)
Mobility Range No practical limit
Mobility Size Range 1 nm – 1 μm (depending on sample)
Mobility Sensitivity 1 mg/mL Lysozyme †
Communications Ethernet interface
Front Panel Display 162.5mm 16-bit high resolution LCD display with Graphical User Interface
Power 200 W typical, 400 W maximum
AC Voltage 90 – 250V @ 50 – 60 Hz, universal power input
Dimensions 59 cm (L) x 36 cm (W) x 21 cm (H); 23″ x 14″ x 8″
Weight 19 kg (41 lbs.)