VF8023 – Air Sampler Controller

Controls a single Air Sampler

Monitors and controls air flow rate

Programmable sample duration and flow rate

Supports continuous or intermittent sampling

Internally monitors fan drive voltage and current

Out of limits alarms for drive voltage, current and fan speed

4-20mA output indicates sample progress

Host communications with ModBus RTU interface

Aux RS485 for use in fault-tolerant systems

Digital I/O for stand alone control

The VF8023 module drives a single Air Sampler and has inputs for control of the ‘Run’ and ‘Gas’ activities and outputs to indicate ‘Running’ and ‘Fault’ states. While ‘Run’ is asserted, the module controls the fan and drives the ‘Running’ output to show this. When the programmed sample duration has elapsed, the Air Sampler drive output turns off and the ‘Running’ status is negated.

The ‘Gas’ input can be used to drive the Air Sampler so that the head can draw gas through the unit during sanitisation. The output remains on until the input request is turned off.

The fan drive voltage, current and fan speed are constantly monitored, and the ‘Fault’ output is asserted if any of the monitored parameters is outside the permitted limits.

The VF8023 offers continuous or intermittent sampling operation to draw an accurate cubic metre sample of air over the sample plate.

With continuous sampling the VF8023 automatically runs the fan until the entire cubic metre sample has been drawn in a single operation.

Intermittent sampling offers a programmable number of shorter samples spread over a longer period to make up the 1 cubic metre volume. For example, a series of 1-minute long samples (100l) drawn every 15 minutes would allow a cubic metre sample to be spread over 2.5 hours. Intermittent sampling is often used to reduce the number of interventions during a production process.