n
measures and monitors the frequency during high voltage gen‐
eration,
n
monitors the system’s priming pressure,
n
measures and monitors the pressure in the ozone generator
(2),
n
measures and monitors the gas flow through the ozone gener‐
ator (2),
n
measures and monitors operating hours, the number of faults
and the number of mains power failures in the system,
n
monitors the cooling water flow rate,
n
measures and monitors the temperature at the cooling water
outlet of the system,
n
monitors the temperature in the control cabinet,
n
controls the solenoid valves of the dryer, cooling water inlet,
gas inlet and gas outlet of the system,
n
triggers the warning, error and operating reporting relays to
report operating statuses,
n
enables the use of a pause contact and switch-off contact
when there is no water,
n
enables the use of an electrically isolated standard signal
output (0/4-20 mA) for the automatic control of the ozone
volume
4.2.8.2 Electronic power unit
The electronic power unit (20) supplies an HV transformer (21) with
medium-frequency alternating voltage. The HV transformer gener‐
ates the alternating high voltage needed for the ozone generation
process from this voltage. The medium-frequency technology pro‐
vides significant advantages over the mains frequency convention‐
ally used in ozone generation. Medium-frequency high-voltage sig‐
nals improve the efficiency of ozone generation and also enable
the ozone generator to have more compact dimensions at the
same time.
The control (70) provides complete control over the electronic
power unit (20) and all the parameters in the ozone generation
process.
4.3 Safety equipment
4.3.1 Flow sensor (accessory)
In line with the safety guidelines DGUV Regulation 103-015
(Guidelines on the use of ozone for water treatment) applicable in
Germany, ozone can only be fed into the mixing equipment if the
required minimum flow rate of the raw water can be guaranteed.
A flow sensor can be connected via an input, which switches off
the system as soon as the flow of raw water becomes too low.
The system must also be locked by the water treatment system cir‐
culating pump via the pause input on the control (70).
The system starts up automatically with the pre-set "Ozone quan‐
tity control variable" if
n
the Pause signal is inactive (contact closed at the Pause input
of the system),
n
there is no other fault.
Components of the system and their function
21