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Common Questions Is this board compatible with both Mark IV and older control systems
pressure fittings
the QL-171 series excels in liquid line applications and suction line service where reliable shut-off is required for maintenance or component replacement
it meets strict UL 1585 and CSA standards
The kit includes a SJB-112-P66 mechanical seal
Dwyer Instruments 1638-10 Pressure Switch 320074-702 Common Questions Is this boardThe Dwyer Instruments 1638 10 Pressure Switch is the commercial standard for high precision monitoring of air and non combustible gases. Engineered with a large diaphragm, this Series 1630 switch provides the low range accuracy required for critical HVAC duct air control and damper positioning applications. It operates within a 3" w. c. to 12" w. c. range with a 0. 11 0. 30 approximate deadband, ensuring a reliable differential pressure response
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