Dwyer Instruments DHII-008 Digihelic II Differential Pressure Controller 0-25 in w.c.

The Dwyer DHII-008 Digihelic II is an innovative differential pressure controller that combines three instruments in one NEMA 4X enclosure: a digital display, relay outputs, and a current output. This model features selectable engineering units with a measurement range of 25.00" w.c., 2.083 ft w.c., 635.0 mm w.c., 63.50 cm w.c., .9032 psi, 1.839" Hg, 46.71 mm Hg, 62.27 mbar, 6227 Pa, 6.227 kPa, 62.27 hPa, or 14.45 oz/in².

Key Features:

• Robust NEMA 4 (IP66) housing for indoor and outdoor applications
• Large 4-digit backlit LCD display with LED indicators for easy monitoring from a distance
• Detachable terminal blocks that reduce wiring difficulties and installation time
• 2 SPDT relay outputs rated for 8 amps at 240 VAC resistive
• 4-20 mA analog output for process control
• Modbus RTU communication via RS485 for system integration
• ±0.5% accuracy at 77°F (25°C)
• Fast 250 ms response time
• 1/8 inch female NPT pressure connections

The NEMA 4 (IP66) enclosure makes this controller ideal for outdoor applications such as rooftop air handlers, as well as indoor environments like clean rooms or facilities where water or cleaning solutions are present. The Series DHII offers a digital upgrade to the industry standard Photohelic differential pressure switch/gage.

Applications: Air handlers, clean rooms, HVAC systems, filter monitoring, and general differential pressure control in industrial and commercial environments.