ProMinent DULCOTEST Manual De Instrucciones página 4

The DULCOTEST
disturbance-sensitive mV signals of a fluoride sensor into a standard 4-20 mA current signal for
open and closed loop control devices (such as DULCOMETER
measuring transducer is screwed directly onto the 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 measuring transducer has a two-wire
connector for power supply and standard signal as well as a connector for a reference electrode.
ATTENTION
• The device must not be used without further protection (outer casing, weather
protection roof) in outdoor applications.
• The interior of the measuring transducer must be protected against moisture
during installation!
• Screw the measuring transducer by hand down to the stop on the sensor.
Never screw down the measuring transducer in any other way!
• When screwing-on the measuring transducer, always hold the sensor by its
head - never on the shaft!
• Proceed cautiously when screwing the measuring transducer onto sensors made
by other manufacturers, to avoid crossing the threads!
• Incorrect connection of the measuring transducer to the sensor can lead to a
falsified output signal!
• Operate the sensor with the reference electrode only within the specified
measuring range of the measuring transducer!
• When the potential measuring range of the measuring transducer is exceeding
due to too high fluoride concentrations, the output signal of the measuring
transducer remains fixed at 3.2 irrespective of the true concentration. The
measuring device would than indicate too low a concentration!
• When evaluating the output signal of the measuring transducer using a PLC
device or a computer pay attention to the logarithmic relation between the
output signal and the fluoride concentration! (cf. operating instruction of the
sensor)
Connecting to ProMinent
Release the clamp screw of the PG cable union (only the clamp screw!)
Turn the upper part of the measuring transducer through a quarter turn in the counter-clockwise
direction and then pull it off (bayonet fitting).
Insert the 2-wire sensor cable (cf. "accessories" for specifications) into the PG cable union.
If necessary, dust the cable with talcum powder or grease to aid fitting.
Strip the cable ends and clamp 0.25 mm cable sleeves onto the stripped cable ends. Connect
the cable ends to the terminals 1 and 2:
Clamps Measuring Transducer
X1:1
X1:2
X2:1
X2:2
Tighten the clamping screw of the PG cable union
Push the top section into the middle section as far as it will go and then carefully turn it in
the clockwise direction until it reaches the stop (take care not to break off the pins on the
bayonet fitting).
Screw the measuring transducer by hand down to the stop on the sensor.
Screw the SN6-socket onto the reference electrode.
Determine the standard potential and make the slope adjustment (calibration) on the
control unit (cf. operating instructions there).
Connecting to measuring/control units from other manufacturers
The measuring transducer can be connected to any measuring or control unit/device which is
equipped with an electrically insulated 4-20 mA current input. Furthermore, the device must deliver
a voltage of at least 18 V DC when loaded with the measuring transducer. When several inputs
are present on the measuring instrument /control unit, they must be mutually electrically isolated.
®
measuring transducer 4-20 mA in two-wire technology converts the
®
units DULCOMETER
+ sensor cable (mA signal)
- sensor cable (mA signal)
bridge
reference electrode
®
D1C) or PLC devices. The
®
D1C
Clamps D1C
X2:9
X2:10