Hach sc1000 - Manual (Page 84)

82
Advanced Operations
Figure 51 shows the output current depending on the process value, the set low value
and the set high value with an output range of 4 – 20 mA.
The output current is determined according to formula (2) :
(2)
where:
OC=Output current
PV=Process value
LV=Low value
HV=High value
Figure 51 Output current with an output range of 4 – 20mA
1 Output current (OC) (y-axis) 5 Low value (LV)
2 OC=f(PV) 6 0mA
3 Process value (PV) (x-axis) 7 4 mA
4 High value (HV) 8 20 mA
OC f(PV)
16mA
HV LV –
---------------------- (PV-LV) 4mA +
Ч
= =