Hanna Instruments mV 600 Series - Manual (Page 9)

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CONTROL MODE
The control mode is the normal operational mode for these
meters. During control mode pH 500 and mV 600 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;
• RS232 management.
In addition, pH 500 and mV 600 can log working data
through RS232 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 tem-
porary exit. To deactivate the
control 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);
2) ON/OFF, low setpoint (base dosage);
3) proportional, low setpoint (base dosage, if available);
4) proportional, high setpoint (acid dosage, if available).
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;
where the minimum deviation (D1 or D2) is 0.5 pH (for
pH 500) or 25 mV (for mV 600).
Note The password cannot be viewed when SETUP is pressed
without entering the original password first. The default
password is set at “0000”. In the event that the user forgets
the password, 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 flash-
ing “WRONG” indicator until the pa-
rameter value is changed by the user
(the same is also true for the setup code selection). In some
circumstances, 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 The setup item 34 is active only in ON/OFF mode and refers
to alarm and dosing relays. When a threshold value is
reached, the corresponding relay will wait for the set time
before starting any action. The default value “00 min 00 sec”
means immediate action.
Note For items 40, 41 and 42, the output is related to pH or mV
units depending on the model (pH process meters or mV
process meters).