Modular design of the odor control unit
The OCU control unit is a modular unit with 19" expansion cards and can be provided either in a 19" rack or in IP65 housing for wall mounting. The control consists of one or two SPU power supply units and power pack units, an OCU control unit and, depending on requirements, additional expansion assemblies.
Odor control unit OCU
The Odor Control Unit (OCU) is the CPU and the base unit for controlling one or two magnetic-driven or motor-driven pump(s). The connection to the expansion modules is possible either via digital outputs (to SPU) or via BUS. All settings can be made with a keyboard with nine keys using a dialogguided system. Multiple dialog languages are selectable.
All data is securely saved to a FRAM in case of power failure. All malfunctions are printed in plain text on the display (8 x 20 characters). The error memory can save more than 200 messages with date and time.
The OCU features connection options for:
- A KMM actual-value sensor (flow meter) or an actual-value sensor with pulse output
- Up to three digital or analog gas meters, each with its own scaling
- A pressure transducer in the gas line to convert gas meter 1 into Nm³
- One or two gas chromatograph(s) for recording odorant concentration(s)
- Solenoid valves in the metering lines Solenoid valve in the filling line to a large tank
In-and output monitoring
All analog input and output signals are monitored. There is a digital "Stop odorization" input in order to stop odorization, for example when refilling. Furthermore, digital inputs are available for up to two pressure switches to monitor the diaphragm(s) of the metering pump(s). The connection to a central computer can be done using a serial interface RS485 and the MODBUS RTU protocol.
Increase flow capacity
With the OCU, up to two metering pumps alternately (e. g. for summer/winter operation) or together (to increase flow capacity) can be controlled. Also, control of magnetic-driven or motordriven metering pumps is possible. The OCU regulates and monitors a preselected odorant concentration in μl/Nm³ or mg/Nm³. The unit of measurement for gas flows can be selected (Nm³, m³, l, kg).