Relays Connections - Hach POLYMETRON 9125 Operator's Manual

Transmitter 9125 – Conductivity / resistivity measurement

Relays connections

Output current connections (mA output)
The 9125 is equipped with 4 relays. Relay S4may be
configured as a temporized relay. The nominal value
of the cutoff current of each relay is 2A for 250 Vca or
0,5 A for 100 Vcc. Cabling should be specified for a
minimum of 80°C (176°F). See figure 3.1 page 17 for
connection location.
S1 is located on the upper part of the terminal and
S2, S3 and S4 under. Each relay is connected to a
2 separated contact terminal, which may be
removed to facilitate the installation.
The relay operation is configured in the software
but the relay switches are always open when the
unit is switched off.
The transmitter has two analogue outputs, which may
be set in 0-20 or 4-20 mA and which are galvanicly
insulated from the controller. Maximum load for each
output is 800 . See Figure 3.1 page 17 for the
terminal location.
Use a signal cable with shielded twisted pair with
the earth shielding in the transmitter.
Connect the cable to the terminal according to the
drawing on the shielded plate.
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