Overview
The Dwyer DA-7035-153-4N is a rugged Bourdon tube temperature switch designed for reliable temperature control in industrial applications. Part of the proven Series DA-7035N family from Dwyer Instruments, this model combines mechanical simplicity with field-adjustable precision. The unit is built with stainless steel construction and delivers the repeatability and sensitivity required in process control, HVAC, and equipment protection systems.
Key Features
- Bourdon tube sensor: High-sensitivity design ensures fast, reliable temperature detection with exceptional repeatability.
- SPDT snap-action switch: Clean, positive switching with minimal contact bounce for critical control applications.
- Fully adjustable deadband: Configure set point and reset point independently over the full operating range.
- External calibrated dial: Visible temperature indication in both °F and °C; no tools required to change setpoints.
- Stainless steel wetted parts: 304 SS bulb and connection for corrosion resistance and long service life.
- 3/4″ NPT process connection: Standard industrial thread for direct mounting into system manifolds and process lines.
Technical Specifications
- Operating Temperature Range: 50–150°F (10–65°C)
- Maximum Process Temperature: 300°F (150°C)
- Minimum Deadband: 25°F (14°C)
- Switch Type: SPDT snap-action switch
- Enclosure Rating: General purpose (weatherproof and explosion-proof versions available)
- Process Connection: 3/4″ male NPT; other sizes available
- Wetted Materials: 304 stainless steel (bulb and connection)
- Dial Indication: Graduated in °F and °C
- Mounting Options: Vertical and level
- Electrical Termination: Screw terminal
Typical Applications
- HVAC Systems: Furnace, chiller, and heat pump control; low/high limit switching.
- Industrial Process Control: Fluid temperature monitoring in manufacturing, food processing, and chemical handling.
- Equipment Protection: Over-temperature shutdown for motors, transformers, and compressors.
- Water Heating Systems: Boiler and water heater control and safety cutoff.
- Refrigeration: Defrost cycle initiation and temperature-based system sequencing.
Compatibility & Replacements
Compatible With
- Industrial process control systems requiring mechanical temperature switches.
- Direct mounting into standard 3/4″ NPT process connections.
- Low-voltage control circuits and relay-based automation systems.
- HVAC and refrigeration equipment with snap-action switch inputs.
- Thermal management systems requiring adjustable setpoint and deadband control.
Replaces / Drop-In Replacement For
- Other Dwyer Series DA-7035N models (with different temperature ranges, e.g., DA-7035-153-1N, DA-7035-153-3N, DA-7035-153-5N, DA-7035-153-8N).
- Generic or OEM Bourdon tube temperature switches with 3/4″ NPT connection and SPDT switching.
- Verify compatibility with your system integrator before ordering to confirm range and switch type requirements.
Works With
- Relay logic control panels and contactor circuits.
- PLC input modules accepting discrete 24 VDC or 120 VAC switch contacts.
- Building automation systems (BAS) with hardwired temperature input cards.
- Industrial control relays and motor starters.
- Low-pressure, high-pressure, and differential pressure instrumentation networks.
