Instruction Manual
Negative Pressure Unit green dec
Version 1
Page 16
The control of the Negative Pressure Unit (NPU) is optionally available in the following
versions:
5.2. Control SE
For power regulation, NPU is supplied with a manual speed controller.
5.3. Control SRE +
For power regulation, the NPU is supplied with a PLC control via a touch display in order
to measure and regulate the negative pressure or the volume flow.
The negative pressure is measured between the contaminated area and a reference point
(adjoining rooms) to be defined and is kept at the set point by continuous speed control of
the electric fan.
The volumetric flow is measured in the unit and is kept at the set point by continuous speed
control of the electric fan. Manual control is also possible.
The fan power is set using the "+" and "-" keys. In "manual" operation the machine does
not regulate!
The need to replace the HEPA filter is indicated on the NPU display.
A filter sensor monitors the particle concentration in the exhaust air and triggers an optical
and acoustic alarm if a value of 100 particles per liter is permanently exceeded.
