Manual Control Of Relays And Test 4 To 20 Ma - HACH LANGE si629 P Manuel D'utilisateur

4. Operation

4.12. Manual control of relays and test 4 to 20 mA

To verify the correct functioning of the relays and 4 to 20 output, enter the options:
Manual Relay
Pressing ENT the selected relay is activated (except from the alarm relay, which is deactivated ). When
not pressing ENT the selected relay is deactivated.
Test 4 to 20 mA
Select in the display, the pH or mV value desired to simulate. The current output must be the indicated
in the display, according to the selected values in Programming Output 4 to 20, see page 18.
MEASURE
pH 7.34 25.2 °C
CODE 000
MAN.RELAY
TEST 4 to 20 mA
Press
Measure pH & ˚C.
MEASURE PH & °C
MEASURE
pH 7.34 25.2 °C
26
si629 P_HACH_LANGE_Ed.0510.indd ANG:26 si629 P_HACH_LANGE_Ed.0510.indd ANG:26
Introduce the code 100 and accept with
Press until the desired option is reached.
MAN. R. > LIMIT 1
CLEANING/LIMIT 2
ALARM
Io (4 to20) =4.00 mA
pH = 00.00
Change the underlined digit
with and accept with
up to return to
RELAY LIMIT 1 OFF
pH 10.54 25.0°c
CLEANING R./LIMIT 2 OFF
pH 10.54 2 5 . 0 ° c
ALARM O F F
PH 10.54 25.0°C
Press to activate any of the relays
(ON). When not pressing
anymore, it deactivates (OFF)
Note: During Manual control of re-
lays and Test 4 to 20 the instrument
is in Hold state:
• Limit and cleaning contact relays
are opened. (Alarm OFF).
• Current output is frozen at the
value programmed in Hold,
except from option "Test 4 to
20" that maintains the manually
current output programmed for
carrying out the tests.
To quit the hold state it is necessary
to return to measure.
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