Series-RRT3

Supported Applications

The Dwyer Series RRT3 Remote Reading Thermometer with Switch combines a dual-scale dial thermometer and an SPDT relay for temperature monitoring. The unit features color-coordinated pointers to display the current process temperature and set point simultaneously.

• Dual scale dial reading of process conditions
• Setpoint adjustment via front knob with internal mechanical switch preventing pointer sticking

Operating Conditions & Performance

The Series RRT3 operates within a specified temperature limit of -4 to 158°F (-20 to 70°C). Accuracy is rated at ±3% FS. The unit utilizes wetted materials and housing constructed from 304 SS.

• Accuracy: ±3% FS
• Temperature Limit: -4 to 158°F (-20 to 70°C)

Configuration Options

The series is offered in three distinct temperature ranges, identified by specific model numbers. The unit includes a 3-1/2" (90 mm) dial and a 10.5' (3.2 m) stainless steel flex hose capillary designed to prevent kinking.

Model Ranges

• RRT3120U: -40 to 120°F (-40 to 50°C)
• RRT3250U: 32 to 248°F (0 to 120°C)
• RRT3300U: 0 to 300°F (-18 to 149°C)

Switch and Electrical Specifications

• Switch Type: SPDT relay rated at 3 A @ 250 VAC, 2 A @ 250 VDC
• Electrical Connections: Screw terminal (terminals labeled N.O., N.C., and COM)

Mechanical Dimensions

• Bulb Length: 3-1/8" (79.24 mm)
• Capillary Length: 10.5' (3.2 m)
• Dial Size: 3-1/2" (90 mm)
• Process Connection: 1/2" (12.7 mm) male NPT
• Weight: 2 lb (0.9 kg)

Key Product Differences

Variants within the Series RRT3 differ primarily by their calibrated temperature ranges, as defined in the model chart. The series includes a u-clamp mounting bracket for panel installation; if panel thickness exceeds 13/64" (5 mm), the bracket must be shortened accordingly.

• Model numbers follow the pattern RRT, such as RRT3120U, RRT3250U, and RRT3300U

The Series RRT3 is not field serviceable. The unit carries a USA: California Proposition 65 warning regarding exposure to chemicals including Lead.