The HE 5709 Basic is a compact digital solenoid valve controller purpose-built for automated cleaning of fabric filters in industrial dust collection systems. Designed for smaller filter installations, it controls up to 4 solenoid valves in a standalone housing with no expansion units required. Its automatic differential-pressure-adaptive pause optimization continuously adjusts the interval between cleaning pulses to match actual filter loading, reducing compressed air consumption and extending valve service life compared to fixed-cycle controllers.

How does automatic pause-time optimization reduce operating costs?

Unlike fixed-cycle timers that pulse at a preset rate regardless of filter condition, the HE 5709 measures the actual pressure drop across the filter media and adjusts the pause between pulses accordingly. When the filter is clean, pauses lengthen — saving compressed air. When dust builds up, pauses shorten to maintain airflow. This demand-driven approach typically cuts compressed air consumption by 30–50% compared to blind timed cycles, and the controller continuously learns from operating data to refine its timing. The result is lower energy costs, less valve wear, and more consistent filtration performance.

What control modes are available for different filter cleaning strategies?

The HE 5709 supports three cleaning modes to match the application. Time-controlled mode pulses valves at fixed intervals — suitable for processes with steady dust loads. Differential pressure (Δp) mode triggers cleaning only when the pressure drop across the filters exceeds a configurable upper threshold and stops when it falls below a lower threshold, adapting in real time to changing dust conditions. Sequential mode cycles through all connected valves in order, ensuring even filter wear. Each mode can be combined with post-cleaning cycles and a configurable maximum pause time that forces a cleaning pulse if Δp stays low too long, preventing dust from settling and hardening on filter media.

Is the HE 5709 suitable for use in hazardous dust environments?

Yes. With the housing cover closed, the HE 5709 Basic is certified for operation in ATEX Zone 22 hazardous areas where combustible dust atmospheres may occur. The compact housing is constructed and tested to VDE 0411 / EN 61010-1 safety standards. An external differential pressure transmitter can be connected via the optional analogue input module for applications where the internal piezoresistive dp sensor — available in ranges from ±2.5 mbar to ±1000 mbar — is not suitable for the process gas.

Frequently Asked Questions

What is the difference between the HE 5709 and HE 5713?

The HE 5709 controls up to 4 solenoid valves as a standalone unit. The HE 5713 controls up to 12 valves directly and can be expanded to 96 valves using up to 7 extension units. For small to medium filter installations with 4 or fewer valves, the HE 5709 provides the same automatic optimization and Δp control capabilities in a more compact, cost-effective package.

Can the HE 5709 be expanded later if more valves are needed?

No. The HE 5709 Basic is a non-expandable compact controller. If your system may grow beyond 4 valves, consider the HE 5713 Basic, which supports extension units for up to 96 valves. Both models share the same operating platform, parameter structure, and dp module options, making migration straightforward.