Instrument for computer control of laboratory processes provides a time-controlled analogue signal as ramp or set-point functions
The 112-65s provides either a ramp output function or a raise-lower to set-point function.
Applications include computer control of laboratory processes, temperature cycling, load, valve and position control, PID controller set-point control.
Control of the output signal is provided by three inputs; Start/Raise, Stop/Lower and Reset.
Output signal rise and fall times are user selectable by internal switches.
All other functions which include input signal polarity, output maximum, minimum and initial values, etc are factory programmed or may be re-programmed by the user with optional PC software.
Input signal types may be specified for either voltage, current, open-collector or volt-free contacts.
Output signal options available cover all common process signals.
In Ramp Generator mode the ramp is started and stopped by momentary contact closure or voltage/current pulse Start and Stop signals.
The Stop signal halts the ramp and holds the output at the current value.
The response to simultaneous Start and Stop signals may be set to perform 'no action' or Start, Stop or Reset the ramp. Post reset action may be set to either restart the ramp or to take no further action.
The active states of input signals are individually programmable ('normal' or 'reversed').
Output options: four ramp types are supported each of which may be set to generate a single period waveform or, using the repeat option, a continuous waveform. Other options enable the ramp to start when power is applied and set maximum and minimum values of the ramp signal (range 0-102.3% of full scale).
In Raise -Lower (Set-Point) mode, whilst the Raise input signal is present the output rises up to the maximum (set-point) value.
Similarly while the Lower input signal is active, the output falls to the minimum (set-point) value.
With no Raise or Lower signals the output is held at the current value.
The response to simultaneous Raise and Lower input signals may be set to Raise, Lower or Reset the output signal or to take no action.
The active states of input signals are individually programmable ('normal' or 'reversed').
Output options: the initial value of the output (ie, output after the instrument is powered up or after a reset) and the maximum and minimum values of the output signal may be set within the range 0-102.3% of full scale.
For manually activated inputs, the initial value of the output may alternatively be set to the last value present on the output before powering down (ie, when turned off, the instrument memorises the last value output even after a power failure).
A test mode is also provided which enable the generation of a range of output signals for commissioning and maintenance purposes.
Universal mains power is provided as standard with the instrument able to operate from a supply in the range 85-265 VAC.
Optional 12VDC and 24VDC powered versions are also available.
