MAGNEHELIC®, PHOTOHELIC®, MINIHELIC®, and DIGIHELIC®
Differential Pressure Gauges/Controller
- Measure and control both positive and negative low air
or gas pressures
- Provide an ideal way of monitoring and controlling the
positive pressure differential required for cleanrooms
- Enable you to meet FED STD 209E regarding cleanroom pressure
- Ideal for measuring differential pressure in gloveboxes and air flow in exhaust hoods
- MAGNEHELIC® Principle ensures wear-free accuracy within
2% of full scale
- Resists shock and vibration
- Available in a number of pressure gauges to suit a wide
range of applications, such as gauging air filters, monitoring
air conditioning systems, and measuring static air pressure
and air vehicles
If your facility incorporates a laminar flow cleanroom, these
MAGNEHELIC® and PHOTOHELIC® differential pressure
gauges can help you maintain the positive pressure necessary
to block inrushing contaminants that can damage sensitive
materials and operations. In doing so, they also help to meet
the requirements and recommendations set forth in FED STD
209E which specifies that a minimum positive pressure of 0.05"
of water differential be maintained between the cleanroom
and adjacent areas.
Chatterless, Wear-Free Accuracy
These gauges incorporate an exclusive MAGNEHELIC® Principle
that eliminates wear, backlash, and hysteresis. The result
is a remarkably high standard of accurate, dependable gauge
performance at a modest price.
This MAGNEHELIC® Principle is a method of transmitting
the effects of changes in air pressure from a diaphragm to
an indicating pointer—by means of magnetic linkage and
without the use of gears or other direct mechanical linkages.
This system avoids wear and physical contact, which might
destroy the accuracy and sensitivity of the instrument. It
delivers accuracy to within 2% of full scale.
This principle offers numerous advantages over other gauges.
Because it uses no fluid, it eliminates evaporation, freezing,
or toxicity problems. It also ensures inertia-free, drift-free
pointer movement and offers unusually high resistance to shock
and vibration. These gauges are also unharmed by pressure
surges up to 15 psig and by ambient temperature fluctuations
between 20 and 140 degrees F.
Both MAGNEHELIC® and PHOTOHELIC® gauges feature easy-to-read
4" dials that quickly provide gas pressures—positive,
negative or differential. Because operation does not depend
on gravity, you can either face- or flush-mount them in any
position. Gauges can also be mounted on panels either inside
or outside of the cleanroom; if mounted inside, the low pressure
ports of the room pressure gauges can be connected together,
and a single tube routed to outside the room.
Versatile Applications
Use the MAGNEHELIC® gauges (range of .25-4.0" WC)
to determine positive pressure differentials between the cleanroom
and adjacent areas. MAGNEHELIC® gauges can also be used
to measure pressure drops across pre-filters and absolute
filters.
A PHOTOHELIC® gauge/switch can also be used to control
makeup or exhaust air dampers in order to maintain the room
pressure within prescribed limits. All gauges can be mounted
on a control panel. Gauge calibration is accomplished between
room readings. In this application the PHOTOHELIC® gauge
serves as the “master” gauge.
These units can also be used to check air filters, to sense
static pressure or to measure air velocity and volume.
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