Metrohm 790 Personal IC - Manual (Page 181)

6 Appendix
790 Personal IC
172
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 < 10 % (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)
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...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
6.1.5 Peristaltic pump
Type 2-channel peristaltic pump
Pump capacity
Rotational speed 20 U/min at 50 Hz
24 U/min at 60 Hz
Flow range 0.5…0.6 mL/min with 6.1826.060 Pump tubing
Maximum error ± 5 %
Maximum pressure 0.4 MPa (4 bar)
Pumpable liquids Clear liquids with no solid contents
Pump tubing material PP (polypropylene)