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Dwyer 1638-2 series large diaphragm pressure switch

The 1638-2 Adjustable Differential Pressure Switch is designed for pressure, vacuum, and differential pressure applications in hazardous areas. The dual scaled adjustment knob in inches water column and pascals allows changes to the switching pressure to be made without a pressure gage. The switch is available with settings from 0.08 in w.c. (20 Pa) up to 16 in w.c. (4000 Pa). The silicone diaphragm makes this series ideal for use with air and other noncombustible gases. Flame-proof ATEX enclosures are available in aluminum and can include a glass window for viewing set point status on adjustment knob.

Important notes for installation:

Cables must be fitted through 1/2" NPT cable gland or ATEX conduit (not supplied with instrument).
Make sure after cabling to close tight cover and cable gland, in order to keep IP66 rating (IP65 with option OPV, overpressure relief valve).
Open cover only after de-energizing instrument.
Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.

Specifications

Service	Air and non-combustible, compatible gases.
Wetted Materials	Diaphragm material: Silicone; Housing material: Brass or SS depending on pressure connections chosen. Switch body: PA 6.6 and POM; Cover: Polystyrene
Temperature Limits	Process and ambient temperature from -4 to 185°F (-20 to 85°C); Case: -58 to 140°F (-50 to 60°C) (Note: Product temperature limits differ from case).
Pressure Limits	40 in w.c. (10 kPa).
Switch Type	SPDT.
Electrical Rating	Max. 1.5 A/250 VAC, max. switching rate: 6 cycles/min.
Set Point Adjustment	Hand knob on pressure switch inside case. (De-energize before opening case).
Mounting Orientation	Vertically, with pressure connections pointing downwards.
Mechanical Working Life	Over 106 switching operations.
Enclosure Rating	IP66. IP65 with option OPV, overpressure relief valve.
Housing Material	Aluminum.
Finishing	Texture epoxy coat RAL7038.
Pressure Connections	1/8" NPT female brass (SS optional). In presence of acetylene it is necessary to use SS.
Electrical Connections	Two 1/2" FNPT. Cable gland not included.
Weight	7 lb (3.2 kg).
ATEX Approved Products from Comhas with ECN	NEMKO 10ATEX1096.
Agency Approvals	CE 0470 II2 GD Ex d IIC Gb T6; -50°C ≤Ta ≤ +60°C Ex tb IIIC Db T 85°C.

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Dwyer 1638-2 series large diaphragm pressure switch

Dwyer 1638-2 series large diaphragm pressure switch

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