Metrohm 844 UV/VIS Compact IC - Manual (Page 105)

5.1 Technical data
844 UV/VIS Compact IC / Gebrauchsanweisung 8.844.1051
93
5.1.2 Injection valve
Actuator switching duration 100 … 150 ms
Pressure resistance
35 MPa (350 bar)
5.1.3 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 at flow 0.2 ... 1.5 mL/min:
0 ... 35.0 MPa (0 ... 350 bar)
at flow 1.5 ... 2.5 mL/min:
0 ... 25.0 MPa (0 ...250 bar)
Residual pulsation < 10 % (at 1 mL/min water and 10 MPa pressure,
without pulsation dampener)
Measurement principle Piezoresistive measurement
Response time: 3 ms
Measurement volume: approx. 50 μL
Maximum error ± 3 % of set value
Resolution 0.1 MPa
Sampling rate 1 measurement/piston stroke (pump running)
1 measurement/s (pump not running)
Safety shutdown
Function Automatic shutdown when upper and lower
pressure limits violated
Maximum pressure limit adjustable between 0.1...35.0 MPa (1...350 bar)
Response time: 1 pump cycle
Minimum pressure limit adjustable between 0.1 ... 35.0 MPa (1...350 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