Hach sc1000 - Manual (Page 83)

81
Advanced Operations
Relation between input current and calculated concentration
Figure 50 shows the output current depending on the process value, the set low value
and the set high value with an output range of 0 – 20 mA.
The output current (OC) is a function of the process value (PV).
The output current is determined by formula (1) :
(1)
where:
OC=Output current
PV=Process value
LV=Low value
HV=High value
Figure 50 Output current with an output range of 0 – 20mA
1 Output current (OC) (y-axis) 5 Low value (LV)
2 OC=f(PV) 6 0 mA
3 Process value (PV) (x-axis) 7 20 mA
4 High value (HV)
OC f(PV) (PV-LV)
20 mA
HV-LV
----------------- Ч
= =