6 Appendix
761 Compact IC
190
6.1.3 Injection valve
Actuator switching duration 100…150 ms
Pressure resistance 25 MPa (250 bar)
6.1.4 High-pressure pump
Type Serial dual piston pump with two valves
Pump capacity
Flow range 0.20...2.5 mL/min
Maximum error < ± 2 % of set value
Flow constancy < 0.5 % of set value
Reproducibility of eluent
flow
typ. better than ± 0.1 %
Pressure measurement
Pressure range 0...25.0 MPa (0...250 bar)
Residual pulsation < 1 % (at 1 mL/min water and 10 MPa pressure,
without pulsation dampener)
Measurement principle Piezoresistive measurement
Response time: 3 ms
Measurement volume: ca. 50 µL
Maximum error ± 3 % of set value
Resolution 0.1 MPa (conductivity measurements)
0.01 MPa (pressure measurements)
Sampling rate 1 measurement/piston stroke (pump running)
1 measurement/s (pump not running)
10 measurements/s (pressure measurements)
Safety shutdown
Function Automatic shutdown when upper and lower
pressure limits violated
Maximum pressure limit adjustable between 0.1...25.0 MPa (1...250 bar)
Response time: 1 pump cycle
Minimum pressure limit adjustable between 0.1 ... 25.0 MPa (1...250 bar),
inactive at 0 MPa
Response time: 5 pump cycles
Pump head
Pump head volumes Main piston: 40 µL
Priming piston: 20 µL
Pump displacement
volumes
Main piston: 28.5 µL
Priming piston: 14.25 µL
Length of stroke Main piston: 3.6 mm
Priming piston: 1.8 mm
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