Dwyer Instruments Mercoid Control DA-31-156-6 Bourdon Tube Pressure Switch 120/240V 10-100PSI -NIB

Dwyer Instruments Mercoid Control DA-31-156-6

Bourdon Tube Pressure Switch

Voltage: 120/240V

Pressure Range: 10–100 PSI

Condition: New in Box (NIB)

Key Features:

• Adjustable Deadband:
  
  Lets you set high and low-pressure switch points separately over the full scale for precise control.

• Visible Dial:
  
  A clear, calibrated dial shows the pressure range and switch actuation—easy to monitor and adjust.

• Switch Options:
  
  Typically uses a snap-action switch, though Mercoid also offers mercury switch versions for specific uses.

• Broad Pressure Range Capability:
  
  Handles pressure from full vacuum to 5,000 PSI depending on the exact model.

• Durable Housing:
  
  Pressed steel construction with a transparent cover for durability and visibility.

Specifications:

• Temperature Rating:
  
  Operates up to 180°F. For higher temps, use a pigtail siphon or remote mount.

• Pressure Connection:
  
  Standard 1/4″ NPT connection (1/2″ NPT for some ranges).

• Wiring:
  
  Screw-type terminals for easy installation (typically SPDT configuration).

• Wetted Parts:
  
  Materials are compatible with brass Bourdon tubes—resistant to corrosion for many fluid types.

• Weight:
  
  Roughly 4 lbs for the standard model. Heavier versions exist for weatherproof/explosion-proof options.

Model Breakdown:

• DA:
  
  Series with adjustable deadband and dual external pressure setpoint adjustments.

• 31:
  
  Refers to brass Bourdon tube with a snap-action switch.

• 156-6:
  
  Indicates a pressure range of 10–100 PSI, SPDT switching action.