Function: Isolating signal converter which will convert a range of process signals into a relay selectable transmission voltage signal. This signal is only put onto the output terminals when a relay, which is in series with the output, is externally selected. Both the input and the output stages of the instrument are powered from separate secondaries of the DC/DC inverter thus maintaining 3 port isolation. Options on the SEL300 include a true 4 wire RTD converter, a Subtractor and an Adder or Averager. In the last three cases the inputs are restricted to mA or Voltage and the SEL300 can only accept two inputs.

Application: The SEL300 is designed for multiplexing a number of varying analogue signals into PLCs and processor based data gathering devices.

Power supply: DC powered

Function: The CSM-1 is a 16 channel current input multiplexer giving one current output. The CSM-1 is designed to increase the number of analogue current signals you can get into PLCs and other data gathering devices in a cost effective manner. The CSM-1 is an all solid state instrument and channel selection is controlled by a four line address bus. Transfer time for the selected channel takes less than 10 microseconds with an overall accuracy of greater than 0.01% of the actual input level.

Power supply: DC powered

Function: The RTM-8 is a 16 channel multiplexer with 8 channels for 3 wire PT100 sensors and 8 channels for two or four wire transmitter current inputs giving one current output. Each of the PT100 input channels is a complete signal conditioner with a DIP switch array for coarse setting, and, Span and Zero multi-turn potentiometers for fine tuning on each channel. The RTM-8 is designed for multiplexing a number of analogue signals into PLCs and processor based data gathering devices. Channel selection is controlled by a four line address bus and an Enable line. The RTM-8 is an all solid state instrument and transfer time for the selected channel takes less than 20 microseconds.

Power supply: DC powered

Function: The DCC-8 is a digital input to 8 channels current loop output converter designed to enhance small PLC units which have limited analogue output capabilities. The inputs can either be 16 bit parallel (12 data, 3 address, 1 enable) or one of two full duplex serial options, RS232c or RS422. The latter option allows up to eight DCC-8 units to be addressed in a multi-drop configuration. In the parallel input string the Enable bit can be strobed allowing synchronous operation of the DCC-8, or it can be left in a permanently ON state to allow continuous update operation. In this state the digital inputs are continuously monitored and compared to the stored values. When new data is encountered, the old data is replaced and the relevant output updated.

The DCC-8 has several user definable options. An internal DIP switch array is used to select: 1) Communications Baud Rate; 2) Unit ID; 3) Digital Input mode (Parallel or Serial) and 4) Output Ranges, either 0 to 20mA or 4 to 20mA.

Power supply: DC powered

Function: The MDM-11 is a current multiplexer/de-multiplexer system that transfers 16 channels of data between two points via a single pair of wires. The front end of the system (M-11) accepts up to 16 process standard 4 to 20mA inputs, multiplexes these at a user selectable scan rate of up to 1000 channels per second and transmits them up to a distance of 2Km maximum. At the receiving end (DM-11) the analogue channels are reproduced in the same order and magnitude as the inputs. The DM-11 unit also has an alarm (flashing LED and volt free contact output) which is operated whenever there is a communications failure of any description (multiplexer failure, cable break or short circuit).

Power supply: DC powered