Hach-Lange SI629 C - Manual (Page 28)

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4. Operation
4.10. Manual control of relays and test 4-20 mA
To verify the correct functioning of the relays and 4 to 20 output, enter the options:
Manual Relay
Pressing the selected relay is activated (except the alarm relay, which is deactivated).
When releasing the key the selected relay is deactivated.
Test 4 to 20 mA
Select in the display, the µS/cm or mg/l 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
20-21.
Nota: During Manual control of relays
and Test 4 to 20 the instrument is in
Hold state:
• Limit and cleaning contact relays are
open. (Alarm OFF).
• Current output is frozen at the value
programmed in Hold, except the
option “Test 4-20” that maintains
the manually programmed current
output for carrying out the tests.
To quit the hold state it is necessary to
return to MEASURE.
MAN. RELAY
CODE 000
MEASURING 22.3°C
545 µS/cm @25°
MAN. R. > LIMIT 1
CLEANING/LIMIT 2
ALARM
Press up to return
to MEASURE
CLEANING R./LIMIT 2 OFF
545 µS
25.0°C
RELAY LIMIT OFF
545 µS 25.0°C
ALARM OFF
545 µS 25.0°C
MEASURING 22.3°C
545 µS/cm @25°
MEASURE
Io (4 to 20) =4.00 mA
200 µS
Press until the desired option is reached.
Enter code 100 and y accept with
Vary the underligned digit with
and accept with
Press
o activate any of the relays
(ON). When not pressing ENT anymore, it
deactivates (OFF).
TEST 4-20 mA
si629 C_HACH LANGE_Ed 0510.indd ANG:24 si629 C_HACH LANGE_Ed 0510.indd ANG:24 20/5/10 12:06:57 20/5/10 12:06:57