Dwyer

DA/DS Bourdon Tube Pressure Switches

Customers say the extremely high sensitivity and great repeatability make this the best pressure switch ever made

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Customers tell us that the Series DA/DS are the best pressure switches made. The Mercoid D Series is one of the world’s broadest lines of pressure switches. The D Series has extremely high sensitivity and great repeatability. The DA Models are equipped with two external adjustments, one for setting high pressure operating point, the other for setting low pressure operating point. Deadband, the difference between high and low setpoints, is adjustable over the full-scale. The DS Models are equipped with a single external adjustment for setting operating point only. For mercury-free switches, choose between the snap action switch or hermetically sealed snap action switch. Hermetically sealed mercury switch also available.

• Visible calibrated dial provides an easy and fast check without having to open device causing dangerous conditions to operators
• On/off indication (except hermetically sealed snap switch models) gives operator clear indication of state of switched equipment that could be located in another location
• Adjustable or fixed deadband supports control applications by reducing equipment wear-out by unnecessary recycling
• External switch setpoint adjustments reduces set-up time
• Pressure ranges of full vacuum to 8000 psig gives application designers the ability to specify standard equipment, simplifying install and training, and reducing servicing costs
• UL listed, CSA approved many models FM approved to support rigorous process applications and regulations
• General purpose, weatherproof or explosion-proof enclosures for a variety of indoor or outdoor environments meeting the needs of multiple applications and uses

Wetted Materials Brass, 403 SS, or 316 SS
Temperature Limit 180F (82C)
Pressure Limit Maximum pressure of the operating range
Enclosure Rating General purpose, weatherproof or explosion-proof
Repeatability 1% of full operating range, 1.5% on DS-7300 models
Switch Type SPST mercury switch, SPDT mercury switch, SPDT snap switch, or SPDT hermetically sealed snap switch. Other circuit types available
Electrical Rating See Catalog page
Electrical Connections Screw terminal
Conduit Connection General purpose: 1/2 in hole for conduit hub.
Weatherproof: 1/2 in conduit hub.
Explosion-proof: 3/4 in female NPT
Process Connection General purpose and weatherproof: 1/4 in male NPT; 1/2 in male NPT on range 15S and 16S.
Explosion-proof: 1/2 in male NPT and 1/4 in female NPT
Mounting Orientation Vertical
Set Point Adjustment Thumbscrew
Weight General purpose: 4 lb (1.8 kg)
Weatherproof: 6 lb (2.7 kg)
Explosion-proof: 8 lb (3.5 kg)
Deadband See Catalog page
Agency Approvals CE, CSA, FM, UL (Mercury switch units are not CE approved). (Consult factory for FM approval models.)

• Compressors
• Mechanical HVAC or process equipment
• Pump control