Honeywell Commercial T991A1004 Proportional Temperature Controller

The Honeywell T991A1004 Proportional Temperature Controller delivers precise, reliable temperature control for duct and tank applications.

This proportional temperature controller uses a copper bulb sensor (1/2 inch diameter x 4-3/16 inch length) with a 5-foot capillary for accurate modulation from 0 to 100°F, with a maximum temperature rating of 125°F. It operates on 24 to 30 VAC at 50/60 Hz and connects via 1/2 inch conduit, making it ideal for industrial HVAC, process control, and equipment cooling in commercial environments.

Key electrical and mechanical specs include a single sensor input, an analog output (135 ohm potentiometer), a throttling range of 3 to 30°F, and a set point range of 0 to 100°F.

Designed for rugged installation, it measures 2 inches wide by 2-1/4 inches deep by 5-5/8 inches high and supports direct immersion at up to 50 psi. Color: Gray.

• Proportional control for smooth temperature modulation
• Copper bulb sensor with 5 ft capillary
• Set point 0–100°F with throttling 3–30°F
• 1/2 inch conduit connection for easy mounting
• Analog output: 135 ohm potentiometer
• Single sensor input for precise readings