Chell Launches a versatile a networkable two channel graphic controller, display and power supply

CMD100

• Any of the analogue input channels can be configured and linearised to display units of choice.
• Process controller complete with self learning PID.
• Supplied with software to allow configuration and data reading on a PC.
• Networkable digital communications via Ethernet, also RS232 and RS 485
• +/- 15 volt 250mA or +24 volt 250mA transducer supplies
• 16 bit resolution, 0.05 % reading accuracy
• Voltage and current input versions available
• Configurable voltage and current analogue retransmission, after linearisation

Chell has used its considerable experience in the supply and calibration of pressure and flow transducers to develop what we consider to be the most versatile controller / display / power supply on the market.

The CMD100 can be used as a process controller as it incorporates a fully adjustable and self-learning PID algorithm. The CMD100 can be configured to control any of the 4 analogue inputs using the PID control. The process can be controlled by driving a standard 100 Ohm process valve (as commonly fitted to flow controllers) or it can control via the flow controller setpoint.

The PID control parameters can be set using the
CMD100's autotune facility or the P, I and D values can be edited manually.
It can also be used as a self-contained power
supply and display for gas mass flowmeters and
controllers, pressure transducers or any other
device with a voltage or current output. The
transducer signal can be scaled displayed and then used to control another device or retransmitted in many different ways .These include voltage or current analogue signals. Configuration extends to displayed units and real channel names, not just channel numbers

These channels can be configured to be displayed on the CMD100's bright VFD display or hidden from the user's view and simply retransmitted as an analogue or digital value.

The display and power supply are housed in a metal case, mains power and process connections are located at the rear of the unit, with the user controls, membrane keypad and display on the front panel.

When supplied by Chell with a transducer, the unit comes pre-configured, linearised as necessary, and displaying the required units.
Setpoint Operating Modes

The CMD can generate a setpoint output in four ways. The first of these is where the setpoint is simply generated internally and set on the front panel (or from the PC). Alternatively, an external analogue process signal can be acquired and the setpoint can be a function of this. Thirdly, the setpoints can be configured in a master / slave fashion where the ratio of two controllers can be fixed and the master set by internal / external setpoints. Lastly, the setpoint can be a function of the PID control, either as a master or a slave.