Chell has developed
its successful CMD100 controller
to interface with up to 20 transducers. These transducers
can be anything with a DC voltage output (5 or
10 VDC). The CMD120 also features a setpoint output
to enable it to support flow controllers.
The CMD120 can be controlled from the front panel or
via digital communications. When controlled over the
interface, the communications protocol allows for
channels to be addressed simultaneously.
For example, all channels, or a group of channels
could be zero’d with one command. |
The CMD120 is housed in a metal case, mains power and process connections
are located at the rear of the unit, with the user controls and display
on the front panel.
When supplied by Chell with transducers, the unit comes pre-configured and displaying
the required units.
Setpoint Operating Modes
The CMD can generate a setpoint output in two ways. The first of these is where
the setpoint is simply generated internally and set on the front panel (or from
the PC). Alternatively, the setpoints can be configured in a master / slave fashion
where the ratio of the controllers can be fixed and the master set by internal
/ external setpoints. When using the master / slave mode, channel 1 is always
the master and channels 2- 20 can be configured as the slave. |
