Description
The Honeywell T991A1061 is a modulating temperature controller designed to provide precise analog temperature control in water or air systems. Operating from 24 VAC to 30 VAC, it features a remote copper bulb sensor with a 5 ft capillary for accurate temperature monitoring in ducts or tanks. The unit offers a proportional analog output through a 135 Ω potentiometer for smooth modulation of connected equipment.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Honeywell |
| Category |
Controls & Indicators |
| Part Number |
T991A1061 |
| Subcategory |
Temperature/Process Control |
| Application |
Modulating control of air or water temperature in ducts or tanks |
| Voltage |
24 VAC to 30 VAC |
| Output Type |
Analog (135 Ω potentiometer) |
| Frequency |
50 Hz / 60 Hz |
| Sensor Type |
Copper bulb |
| Sensor Inputs |
1 |
| Capillary Length |
5 ft (1.5 m) |
| Bulb Size |
½ in dia × 4-3/16 in L (13 mm × 107 mm) |
| Setpoint Range |
160 °F to 260 °F (71 °C to 127 °C) |
| Maximum Operating Temperature |
280 °F (138 °C) |
| Throttling Range |
3 °F to 30 °F (1.7 °C to 16.7 °C) |
| Case Color |
Gray |
| Dimensions |
5-5/8 in H × 2 in W × 2-1/4 in D (143 mm × 51 mm × 57 mm) |
| Mounting |
Panel or surface mount |
| Max Bulb Pressure |
50 psi (direct immersion) |
| Output Signal |
Analog, modulating 135 Ω potentiometer |
| Weight |
1.20 lbs (0.54 kg) |
Information About T991A1061
The T991A1061 belongs to Honeywell’s T991 Series of modulating temperature controllers, which provide accurate proportional control for heating and cooling systems. This model covers a temperature range of 160 °F to 260 °F (71 °C to 127 °C) and includes a copper bulb sensing element for fast thermal response. With a compact case and front-access adjustable setpoint dial, it is ideal for water heaters, air-handling units, or process tanks. The controller’s fast-response sensing design ensures stability and accuracy, while the throttling range (3 °F to 30 °F adjustable) allows fine-tuning for specific control requirements.
Key Features:
- Analog Modulating Control: Provides smooth proportional output for accurate temperature regulation.
- Wide Temperature Range: Adjustable setpoint from 160 °F to 260 °F (71 °C to 127 °C).
- Copper Bulb Sensor: Durable and thermally responsive for precise measurement.
- Adjustable Throttling Range: 3 °F to 30 °F (1.7 °C to 16.7 °C) for optimized control sensitivity.
- Remote Capillary Design: 5 ft (1.5 m) capillary enables flexible sensor mounting in ducts or tanks.
- Ambient Temperature Compensation: Corrects for ambient effects on the case and tubing.
- User-Friendly Adjustment: Setpoint dial visible and adjustable through front cover.
- Robust Construction: Designed for continuous operation with maximum bulb immersion pressure of 50 psi.
- High Operating Limit: Withstands up to 280 °F (138 °C) maximum operating temperature.
- Versatile Application: Suitable for modulating control of air or liquid temperature in HVAC or process systems.
The T991A1061 delivers the reliability and precision required for industrial and commercial temperature modulation applications.
