User Guide

CONTROL MODE

The control mode is the normal operational mode for these

meters. During control mode pH 502 and mV 602 fulfill the

following main tasks:

• convert information from pH/ORP and temperature inputs

to digital values;

• control relays and generate the analog outputs as deter-

mined by the setup configuration, display alarm condition;

• RS485 management (if the feature is included).

In addition, pH 502 and mV 602 can log working data

through RS485 connection. This data includes:

• pH, mV and

C measured values;

• last calibration data;

• setup configuration (also from PC).

The status of the meter is shown by the LED’s on the right

STATUS LEDs

Control Alarm Alarm LED (green) Relay LED (yellow) Red LED

OFF ---- ON OFF ON

ON OFF ON ON or OFF OFF

ON ON OFF ON or OFF Blinking

Meter exits control mode by pressing SETUP or CAL and con-

firming the password. Note that this command generates a

temporary exit. To deactivate the con-

trol mode definitively, set CONTROL

ENABLE to “0” (item # 02).

RELAY MODES

Once enabled, the relays 1 and 2 can be used in four differ-

ent modes):

1) ON/OFF, high setpoint (acid dosage) (not for pH5025YZ

and mV6025YZ);

2) ON/OFF, low setpoint (base dosage) (not for pH5025YZ

and mV6025YZ);

3) PID, low setpoint (base dosage, if available);

4) PID, high setpoint (acid dosage, if available).