The DEMS5005 Pulse Collector has the function to integrate into the system those pulse-output transmitters (volume meters, consumption meters, etc.), which are connected to the inputs of the device. Through the use of this device, it becomes simple to connect various devices to process control systems.
This device performs two different functions:
- Counting of incoming pulses (consumption / metering), and
- Measuring the time between the incoming pulses (momentary consumption metering, flow-volume measurement, etc.).
The DEMS5005 can be connected to a signal-processing computer, or to a PLC through a communication interface RS232 / RS485, the communication protocol is: MODBUS RTU. NAMUR and contact outputs can be connected to the input of the pulse collector. In the event of NAMUR input transmitters, the device is equipped with a line-fault detection function to monitor of short or open circuit lines.
Two different measurement ranges are available for selection: 0-10 Hz (here the input is bounce-free), and 0-50 Hz.
The user can select from the following input modes: the device is activated by rising or falling edges, or (in the case of a contact), the device is activated by the closing or the opening of the contact.
The operating parameters can be specified and downloaded by a simple configurating programme, running on a PC. Such parameters are: input selection (NAMUR / contact), input mode (rising signal / falling edge detection), frequency range. In on-line mode, the program allows for a continuous monitoring of all inputs. The pulse collector device can be connected to a configurating computer via an USB port.
The DEMS5005 has to power supply versions: 18-40 V AC/DC (DEMS5005) or 180-250 VAC (DEMS5005 PS).
The device preserves the settings and the measured pulse numbers for an unlimited period of time.