Metrohm 709 IC Pump - Manual (Page 30)

3 Operation
709 IC Pump
22
3.4.2 Maximum pressure limit
The maximum shutoff pressure of the pump can be set in steps of
0.1 MPa from 0.1 … 50 MPa with the pump drive switched on or off. Pro-
ceed as follows:
1 Select "P
max
"
Press <SELECT> key 4 until the "P
max
" LED 12 lights up.
2 Set shutoff pressure
Press < ↓ > key 5 or < ↑ > key 6 until the desired shutoff
pressure (in MPa) appears in display 1.
3 Store shutoff pressure
Release < ↓ > key 5 or < ↑ > key 6: the value shown in display
1 at the time of release will be stored.
The set limit value should lie between 5.0 and 10.0 MPa above the par-
ticular operating pressure or the maximum admissible operating pres-
sure of the column. If the pump exceeds the preset limit value during
operation, the pump drive is switched off within 1 pump cycle and dis-
abled. If the pump has been switched off by the maximum pressure
limit monitoring, the LED 12 flashes, the shutoff pressure can be re-
quested in the display "P
actual
" (see section. 3.7).
Pressing the <R/S> key 3 re-enables the pump drive, LED 12 no
longer flashes and the pump is in the standby mode. Pressing the
<R/S> key 3 again puts the pump back into operation.
The 2.709.0110 IC Pump MF (metal-free version) should only be
operated in the pressure range of 0 … 25.0 MPa (0 … 250 bar). With
higher pressure, the 6.2824.100 PEEK pump head can be damaged.
So make sure that the maximum shutoff pressure P
max
of the pump is
always set to ≤ 25.0 MPa.
3.5 Switching the pump drive on and off
Switching on Pressing the <R/S> key 3 switches on the pump drive.
While the pump drive is running, LED 2 above the
<R/S> key 3 lights up.
Switching off To switch off the pump drive, press the <R/S> key 3
again. LED 2 goes out.