Systec® ZHCR® Product Data Sheet Vacuum pump and CONTROLLER Systec ZHCR ®
®
Typical D
Vacuum Pump and Controller
The Systec ZHCR (Zero Hysteresis / Constant Run) vacuum pump is designed for membrane degassing of the HPLC mobile phase. Employing a patented closed-loop,
micro-stepping, RPM control-strategy permits the pump to run with continuously variable speed, providing quick pull-down at high RPM, and then sustaining a consistent
Zero Hysteresis / Constant Run vacuum level at low RPM.
The Systec ZHCR (Zero Hysteresis / Constant Run) f Patented control eliminates baseline fluctuations vacuum pump is designed for membrane degassing of f Inert flow path the HPLC mobile phase. Employing a patented closedloop, micro-stepping, f 5+ year lifetime RPM control-strategy permits the pump to run with continuously variable speed, providf Built-in anti-backflow check valves ing quick pull-down at high RPM, and then sustaining a f Compact consistent vacuum level at low RPM.
Typical Degassing Fluctuations from Vacuum Sources Systec ZHCR
Competitor Vacuum Source 0.084
Absorbance (Au)
0.082
Fluctuations in detector baseline due to changes in vacuum
• Patented control eliminates baseline fluctuations level are eliminated by not having to repeatedly stop and • Inert start flowa single-speed path pump. This also greatly reduces wear • 5+ year andlifetime noise. • Built-in anti-backflow check valves The brushless motor enables quiet operation and is appropriate • Compact
0.08 0.078 0.076 0.074 0.072
for environments where solvent vapors may be present.
Fluctuations in detector baseline due to changes in Flowpaths are entirely inert and the continuously purged vacuumhead level are eliminated by not having to repeateddesign allows the pump to start into a full vacuum – ly stop and start single-speed vacuum will a not be released in pump. the eventThis of a also powergreatly loss. reduces wear and noise. The brushless motor enables quiet operation and is appropriate for environments where solvent vapors may be present. Flowpaths are entirely inert and the continuously purged head design allows the pump to start into a full vacuum – vacuum will not be released in the event of a power loss.
*Vacuum chamber consists of 480 µL of Systec AF tubing: flow rate is 1 mL/min, eluent is methanol; wavelength is 215 nm.
0.07
I
50
100
150
200
250
300
350
400
Time (sec)
Fluctuations in detector baseline of a single-speed pump compared Fluctuations in detector baseline of a single-speed pump compared to the to the patented technology of the Systec ZHCR vacuum pump.* patented technology of the Systec ZHCR vacuum pump.* UV detector baseline fluctuations are minimal when compared to UV detector baseline fluctuations are minimal when compared to traditional traditional stop and start vacuum sources.
0.084
stop and start vacuum sources.
*Vacuum chamber consists of 480 μL of Systec AF tubing: flow rate is 1 mL/min, eluent is methanol; wavelength is 215 nm.
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