Hanna Instruments HI 504 User Manual

Page 49

• Some keys are used to toggle relays and LEDs ON and

OFF:

- the LCD key toggles the alarm relay and the alarm LED;

- the CAL DATA key toggles the red LED;

- the

æ key toggles relay 1 and the corresponding LED;

- the key toggles relay 2 and the corresponding LED;

- the SETUP key toggles relay 3 and the corresponding LED;

- the CAL key toggles relay 4 and the corresponding LED;

- the key toggles the digital insulated hold output.

• When a relay/LED is activated, all the others are disactivated.

• LEDs are verified simply by looking at them, while relays

can be verified through a multimeter set for continuity test.

• To exit the test press the CFM key and the previous configu-

ration of the relays is reestablished. The instrument will remain
in the setup menu and move to the next setup item (t.04).

ANALOG OUTPUT TEST

The analog output test is done through the setup items t.04
(analog output 1) and t.05 (analog output 2).

• To enter the analog output test procedure select the corre-

sponding setup item and an “OFF” blinking message will
appear on the LCD.

• Press the

æ (or ) key once and the message will switch to

a blinking “GO”.

• Press CFM key to confirm or the

æ (or ) key again to

return to the previous status.

• If confirmation is given when the “OFF” message is blink-

ing, no action is performed and it will move to the next
setup item.

• Once confirmed the test, a start out-

put value (mA) is proposed and
displayed on the primary LCD. This
value is let out to the analog output
and coincides with the minimum

• During this time the instrument performs the EEPROM check,

and if the checksum is correct, the “Stored data good”
message will scroll on the primary display.

• After that, the meter will remain in setup menu and move to

the next setup item.

• If the checksum fails, a fault alarm is generated and the

following message appears on the LCD: “Stored data error
- Press “UP” button to reset stored data or “RIGHT” button
to ignore”.

• If the key is pressed the process controller restarts opera-

tion, but alarm actions are performed as configured by the
user (see “Alarm - Error configuration” section).

Note that the device will be in Hold mode in any case.

• If the

æ key is pressed, all the data stored in the EEPROM

are erased and the default values loaded.

• Once performed the selected action, the instrument will

remain in the setup menu and move to the next setup item
(t.03).

RELAYS AND LEDS TEST

• To enter the relays and LEDs test procedure select the setup

item t.03 and an “OFF” blinking message will appear on
the LCD.