ProMinent DULCOTEST 4-20 mA pH V1 Mode D'emploi page 4

®
The DULCOTEST
ve mV signals from pH and redox combination electrodes or Pt 100 platinum resistance
thermometers into a standard 4-20 mA current signal for open and closed loop control devices
(such as DULCOMETER
directly onto the electrode/sensor. This avoids almost all kinds of disturbance otherwise caused
by moisture, dirt or electric fields, and transmission is absolutely reliable even over great distances.
On the output side the transducers have a two-wire connector for power supply and standard
signal.
ATTENTION
G The device must not be used without further protection (outer casing, weather
protection roof) in outdoor applications.
G The interior of the transducer must be protected against moisture during
installation!
G To screw the transducer onto a measuring sensor, use only a size SW 22 fork
wrench applied to the hexagonal part of its bottom section. Never screw down
the transducer in any other way!
G When screwing-on the transducer, always hold the measuring sensor by its
head - never on the glass shaft!
G Proceed cautiously when screwing the transducer onto measuring sensors made
by other manufacturers, to avoid skewing the threads!
G Incorrect connection of the transducer to the measuring sensor can lead to a
falsified output signal!
G Operate measuring sensors only within their specified measuring range,
otherwise excessively large signal current can lead to voltage drop of the power
supply, and the signal from the measuring probe may be falsified!
➣
Turn the upper part of the transducer through a quarter of a rotation in the clockwise direction
and then pull it off (bayonet catch).
➣
Release the terminal screws of the PG cable union (only the clamp screw) and then insert the
2-wire sensor cable (see under "accessories" for specifications). If necessary, make the cable
able to slip with talcum powder or grease.
➣
Bare the cable ends and connect them to the terminals 1and 2.
Terminal Sensor cable without
potential equaliser
X1:1 +
X1:2 -
X2:1
Bridge
X2:2
Additionally for liquid potential equalisation (pH/redox):
➣
Pierce the blind hole (1.5 mm diam.) in the sealing ring of the cable screw fitting. Pass the
flexible conductor for the potential equalisation pin through the blind hole. Disconnect the
jumper on the terminal X2 and connect the flexible conductor to X2-1.
➣
Tighten the camping screw of the PG cable union.
➣
Push the top section into the centre section as far as it will go and then carefully turn it in
the clockwise direction until it comes against the stop (take care not to break off the noses
on the bayonet catch.)
➣
Screw the transducer onto the measuring sensor and tighten cautiously using a size
SW 22 fork wrench.
➣
Only for pH-transducers: Make the zero point and slope adjustment (calibration) on the
control unit (see operating instructions manual of the control unit).
Connecting to measuring/control units from other manufacturers
These transducers can be connected to any measuring or control device/instrument which is
equipped with an electrically isolated 4-20 mA current input. Furthermore, the device must deliver
a voltage of at least 18 V DC when loaded with the transducer.
Only for pH V1 and rH V1: when several inputs are present on the measuring instrument or control
device, they must be mutually electrically isolated.
Transducer 4-20 mA in two-wire technology converts the disturbance-sensiti-
®
D1C or DULCOMARIN
®
) or PLC devices. The transducers are screwed
Sensor cable with
potential equaliser
+
-
Potential equaliser