Mercoid Series DA

Series DA/DS Bourdon Tube Pressure Switch

Pressure Ranges to 8000 psi (551.6 bar)

Customers tell us that this is the best pressure switch made. The Mercoid Series DA / DS is one of the world’s broadest lines of pressure switches. Whatever your application might be, it is most probable it can be fully satisfied with a D Series pressure switch.

The D Series has extremely high sensitivity and great repeatability. The Mercoid Series DA / DS 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 set points, is adjustable over the full scale. The DS Models are equipped with a single external adjustment for setting operating point only. The deadband is fixed at a factory setting and cannot be altered in the field. For switches choose between the snap action switch, hermetically sealed snap action switch and hermetically sealed mercury switch.

Mercoid Series DA Specifications

• Wetted Materials: Brass, 403 SS, or 316 SS.
• Temperature Limit: 180°F (82°C).
• Pressure Limit: Maximum pressure of the operating range.
• Enclosure Options: 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″ hole for conduit hub. Weatherproof: 1/2″ conduit hub. Explosion-proof: 3/4″ female NPT.
• Process Connection: General purpose and weatherproof: 1/4″ male NPT; 1/2″ male NPT on range 15S and 16S. Explosion-proof: 1/2″ male NPT and 1/4″ 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.)

Mercoid Series DA Features

• Visible calibrated dial.
• On/off indication (except hermetically sealed snap switch models).
• Adjustable or fixed deadband.
• SPDT snap-action, hermetically sealed snap action or hermetically sealed mercury switch.
• External switch setpoint adjustments.
• Minimum deadband is obtainable at any point in the range.
• Pressure Ranges of full vacuum to 8000 psig.
• UL listed, CSA approved. Many models FM approved.
• General purpose, weatherproof or explosion-proof enclosures.

Mercoid Series DA Options

• Explosion-proof Enclosure (Series DAH): Suitable for Class I, Groups C and D; NEMA 7; Class II, Groups E, F, G; Class III NEMA 9 and 9A, Division 1. Add “H” to model number after DA or DS. Example: DAH-31-153-7.
• FM Approved: For general purpose and explosion-proof models see Agency Approvals on Specification page. Add “F” to model number after DA, DS, DAH or DSH. Examples: DAF-31-153-7 or DAHF-31-153-7.
• Other Options (consult factory): DPDT switches or other switch types, fixed deadband mercury switch units for low deadband applications, manual reset operation, two-stage operation, acetal bushed movement for applications with high amounts of vibration and/or pulsation, fungus proofing, siphon, diaphragm seals, mounting flange and remote connection.
• Weatherproof Enclosure (Series DAW): Add “W” to model number after DA or DS and change 1 to 3. Example: DAW-33-153-7.

Available Series D Models