Hanna Instruments PCA 310 - Manual (Page 8)

8
13 standards. Molded fiberglass polyester has outstanding
chemical and temperature resistance.
The case provides wall mounting capability and door gasket
assures a watertight and dust-tight seal.
The electrical and hydraulic connections are made through
the side of the enclosure.
The front cover is secured with two lockable latches.
Four chlorine level setpoints can be adjusted by the operator:
a proportional dosing setpoint, two alarm setpoints and a
minimum level for dosing.
The proportional dosing factor (1/delta) is user selectable with
a delta between 0.1 and 5 mg/L (ppm). Chlorine dosing sys-
tem controls a SPST relay.
Each chlorine alarm can be enabled or disabled.
Three pH level setpoints can be adjusted by the operator: a
dosing setpoint and two alarm setpoints. The pH control mode
is user selectable: on/off or proportional dosing.
The proportional dosing factor (1/delta) is user selectable with
a delta between 0.1 and 2 pH . The on/off dosing hysteresis is
user selectable between 0.05 and 2.00 pH. pH dosing system
controls a SPST relay.
Each pH alarm can be enabled or disabled.
For temperature and ORP, two alarm levels can be set by the
user.
Each temperature or ORP alarm can be enabled or disabled.
Alarm condition controls a SPDT relay.
A system error feature provides relay activation to signals need
for operator intervention.
System error condition controls a SPST relay.
Two current outputs of 4-20 or 0-20 mA are available to drive
external devices such as chart recorders.
The analyzer can drive two dosing pumps through the 4-20
mA outputs for chloride and for acid/alkali dosing.
The analog output is fully programmable and could be propor-
tional with chlorine concentration, pH, ORP or temperature
value. The limits of the analog output is selectable for each
parameter.