12
Connection of external components
The product should be installed and used only according to the intended application.
Fitment of the regulator and maintenance work should be carried out by only trained
personnel. Mounting and servicing operations should be carried out only after
switching off the voltage. The current safety regulations must be followed!
The device should be operated only with safe low voltage. This also applies to all
external connections, for example, the relay outputs.
The device is provided with extensive outputs for extension of functionalities:
An external alarm light for remote mounting, if the device is not in a noticeable position
e.g. mounted in compressor room.
Two potential free alarm outputs (Normally closed i.e. residual loop current) for early
warning and main alarm. The contact of the early warning alarm can also be alternatively
used for regulation of a dryer.
External power supply, for example, if the device is connected to other components and
these are also to be fed by the device.
An analog output 4... 20 mA for connection to an SPS or a super level measuring
system.
A digital RS 232 or 485 interface for connection to a PC over COM-port or USB interface.
For this purpose, the software PCLOG is available, as accessories for recording the
measuring curves.
12.1
Layout of extension socket in the device
Signal
Pin Function
ALARM S
1
Switch output for external acoustic signal generator (Buzzer), Open
collector output, with timer, wired against ground
ALARM SUP
9
Operating voltage for signal generator, 15 V DC / 50 mA, (provided
by the device for signal generator)
ALARM L
2
Switch output for external optical signal generator (Blinking light),
Open collector output, with timer, wired against ground
RS485 B
10 Digital data interface as per RS 485 standard, Line B
RS485 A
3
Digital data interface as per RS 485 standard, Line A
RS232
11
Digital data interface as per RS 232 C Standard, TX-Line
GND RS
4
Reference potential for RS 485 and RS 232 interface, not potentially
isolated to device ground
GND ANA
12 Reference potential for analog output, not potentially isolated to
device ground
OUT ANA
5
Analog output 0 ... 20 mA for Dew point value –20
…
40 °C tpd
