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18.1 Sensors and measuring instruments
Sensors
The product range includes high-precision platinum temperature sensors, flatscrew
sensors, outdoor temperature sensors, indoor temperature sensors, cylindrical
clip-on sensors, also as complete sensors with immersion sleeve.
SP10 overvoltage protection device
In order to avoid overvoltage damage at collector sensors (e.g. caused by local
lightning storms), we recommend installing the SP10 Overvoltage protection.
CS10 Solar cell
The CS10 Solar cell is used for detecting the irradiation intensity. The short-circuit
current rises with the increase in irradiation intensity. Depending on the controller,
the sensor can also be used for additional plausibility control or direct control. The
connecting cable can be extended by up to 100 m.
VFD and RPD Grundfos Direct Sensors™
The RPD Grundfos Direct Sensor™ is a digital sensor that measures both tem-
perature and pressure. The VFD Grundfos Direct Sensor™ is a digital sensor that
measures both temperature and flow rate.
V40 flowmeter
The V40 is a measuring instrument for detecting the flow of water or water/glycol
mixtures. After a specific volume has passed, the V40 reed switch sends an impulse
to the calorimeter. The heat quantity used is calculated by the calorimeter using
these impulses and the measured temperature difference with the help of pre-de-
fined parameters (glycol type, concentration, heat capacity, etc.).
18.2 VBus
®
accessories
SD3 / SDFK Smart Display / GA3 Large Display
The Smart Display is designed for simple connection to controllers with VBus
®
. It
is used for visualising data issued by the controller: collector temperature, store
temperature and energy yield of the solar thermal system.
The SDFK Smart Display indicates the solid fuel boiler temperature and the bot-
tom / top store temperatures as well as the pump status. The use of high-efficiency
LEDs and filter glass assures a high optical brilliance. An additional power supply
is not required.
The GA3 is a completely mounted large display module for visualisation of collec-
tor- and store temperatures as well as the heat quantity yield of the solar system
via one 6-digit and two 4-digit 7-segment displays. An easy connection to all con-
trollers with VBus
®
is possible. The front plate is made of antireflective filterglass
and is printed with a light-resistant UV-lacquering. The universal VBus
®
allows the
parallel connection of 8 large displays as well as additional VBus
®
modules.
AM1 Alarm module
The AM1 Alarm module is designed to signal system failures. It is to be connected
to the VBus
®
of the controller and issues an optical signal via the red LED if a failure
has occurred. The AM1 also has a relay output, which can e. g. be connected to a
building management system (BMS). Thus, a collective error message can be issued
in the case of a system failure.
EM Extension module
The EM Extension module offers 5 additional relay outputs and 6 additional sensor
inputs for the controller.
DL2 Datalogger
This additional module enables the acquisition and storage of large amounts of data
(such as measuring and balance values of the solar system) over a long period of
time. The DL2 can be configured and read-out with a standard Internet browser
via its integrated web interface. For transmission of the data stored in the internal
memory of the DL2 to a PC, an SD card can be used. The DL2 is appropriate for all
controllers with VBus
®
. It can be connected directly to a PC or router for remote
access and thus enables comfortable system monitoring for yield monitoring or
for diagnostics of faults.
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