Hanna Instruments mV 602 Series - Manual (Page 9)

17 16
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 o 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).
If M1 = 3 and M2 = 2
then S1>S2+H2, S2>LA, HA>S1+D1;
If M1 = 2 and M2 = 3
then S1+H1LA, HA>S2+D2;
If M1 = 4 and M2 = 1
then S1LA, HA>S2;
If M1 = 1 and M2 = 4
then S1–H1>S2, S2–D2>LA, HA>S1;
If M1 = 3 and M2 = 4
then S1>S2, S2–D2>LA, HA>S1+D1;
If M1 = 4 and M2 = 3
then S2>S1, S1–D1>LA, HA>S2+D2;
For pH5025YZ and mV6025YZ only:
If M1 = 1 then S1+D1If M1 = 2 then S1–D1>LA;
where the minimum deviation (D1 or D2) is 0.5 pH (for pH502)
or 25 mV (for mV602).
Note The password cannot be viewed when SETUP is pressed with-
out entering the original password first. The default password
is set at “0000”. In the event that the user forgets the pass-
word, this can be reset to “0000” by pressing and holding
CFM and then pressing LCD and CAL DATA at the same time
when the pH controller is in normal operating mode (idle or
control with measurement displaying).
Note When a wrong setup value is con-
firmed, the pH controller does not skip
to the next setup item but remains in
the current item displaying a flashing
“WRONG” indicator until the param-
eter value is changed by the user (the
same is also true for the setup code selection). In some cir-
cumstances, the user cannot succeed in setting a parameter
to a desired value if the related parameters are not changed
beforehand; e.g. to set a pH high setpoint to 10.00 the high
alarm must be set to a value greater than pH 10.00 first.
Note For code numbers 40, 41, 42, the output is related to pH or mV units
depending on the model (pH process meters or mV process meters).
Items 41 and 42 are not available in pH5025YZ and mV6025YZ.