Hach-Lange SI629 C - Manual (Page 16)

12
3. Installation
Important notes:
• El si629 C does not require ground
connection (terminal 1).
• In environnements with interference problems
it is recommended to connect the instrument to
ground using terminal 1.
It is also recommended to use shield cables
for the cell signal (triaxial cable), and the
temperature probe.
The external shield of the triaxial cable and
the temperature cable must be connected to
terminal 16.
DANGER
Relays:
- Limit the current up to 3 A by using
one fuse.
- Do not connect cables with voltage
higher than 24 V.
Terminal assignment (rear panel)
Transmitter si629 C
RED
VCA
A L 2 / C L
CELL 4-20 mA
S/N: CRISON INSTRUMENTS, S.A.
E-08328 ALELLA - Barcelona
Made in Spain IP 54
3.3. Cell cables
Compensation of the cable length
To minimize the effect of the cable resistance in a conductivity measurement, the cable length is compensa-
ted by the 4-wire system. With the Pt 1000 temperature sensor, the cable resistance has little importance.
However, in order to reduce the resistance of the conductor to a half, 2 cables have been connected to
the ends of the sensor.
3.3.1. Cells with MP-5 connector
TERMINALS
COLOUR
si629 C
(wall mount)
si629 C
(panel mount)
6 18 White
6 18 Brown
7 17 Pink
7 17 Yellow
8 16 Shield
9 15 Green
10 14 Blue
11 13 Gray
12 12 Red
MP-5 connector, 5 contacts
si629 C_HACH LANGE_Ed 0510.indd ANG:12 si629 C_HACH LANGE_Ed 0510.indd ANG:12 20/5/10 12:06:51 20/5/10 12:06:51