Spirax Sarco BT1050 is a bottom blowdown controller designed for industrial boilers. The controller features three independently adjustable timers, supports Modbus RTU communication and coordinated network control for up to 9 devices, and provides IP65 and NEMA 4 front-panel protection. It is suitable for timed bottom blowdown in single or multiple industrial boiler systems, opening valves according to configured sequences and priorities to effectively remove settled solids from the bottom of the boiler.
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Spirax Sarco BT1050 Boiler Bottom Blowdown Controller
Timed boiler bottom blowdown controller supporting three independent timers and multi-boiler coordination.
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Specifications
- Supply voltage
- 110-240Vac, 50/60Hz
- Maximum power consumption
- 7.5W
- Ambient temperature range
- 0-55°C
- Maximum altitude
- 2000m
- Maximum relative humidity
- 80% up to 31°C decreasing linearly to 50% at 40°C
- Overvoltage category
- III
- Pollution degree
- 2 (as supplied), 3 (when installed in an enclosure rated at least IP54 or UL50/NEMA 3,3S,4,4X,6,6P,13)
- Front-panel protection rating
- NEMA 4 (UL certified) / IP65 (TRAC Global certified)
- Mounting method
- Panel, DIN rail, baseplate mounting
- Output relays
- 2×SPCO, 250Vac, resistive 3A/inductive 1A @250Vac
- Communication protocol
- Modbus RTU over RS485 4-wire full-duplex/2-wire half-duplex, up to 256 devices
- Infrared communication
- IrDA, 38400 baud, 10cm, ±15°
- Number of timers
- 3 independently adjustable
- Maximum network size
- 9 units (BT1050 or BT1000)
- Clock battery life
- 10 years standby @25°C / 10 years operating @55°C (lithium thionyl chloride AA)
- Wiring terminal specification
- Plug-in screw connection, 0.2-2.5mm² (24-12 AWG)
- Maximum RS485 transmission distance
- 1200m
- Certifications
- EMC 2014/30/EU, LVD 2014/35/EU, EN 61010-1, UL, TÜV
Application scenarios
Timed bottom blowdown for a single industrial boiler
Used for timed control of a single industrial boiler bottom blowdown valve. The valve is opened according to configured blowdown intervals and durations to remove settled solids from the boiler bottom. Three independent timers support up to three blowdown cycles per day, with programs configurable for different working days.
Multi-boiler blowdown coordination and priority control
Used for coordinated bottom blowdown control of multiple BT1050 or BT1000 units in multi-boiler systems, with up to 9 devices connected. The controller supports master, slave, and blowdown-priority settings to coordinate blowdown operations across boilers in a configured sequence.
Bottom blowdown control in industrial boiler room control panels
Installed on control-panel faces, DIN rails, or baseplates in industrial boiler rooms to control bottom blowdown valves. The product is suitable for Class A industrial environments and provides NEMA 4 or IP65 front-panel protection, making it suitable for local operation and blowdown control in industrial boiler control panels.
FAQ
What is the primary purpose of the BT1050 boiler blowdown controller?
BT1050 controls the timed opening of boiler bottom blowdown valves to discharge settled solids and reduce the risk of boiler damage caused by deposit accumulation.
How many blowdown cycles can be configured on the BT1050?
BT1050 has three independently adjustable timers for configuring different cycle intervals and durations. Up to 3 blowdown cycles can be selected per day, and boiler blowdown priorities can be configured.
Does the BT1050 support multi-boiler blowdown control?
Yes. BT1050 can be configured as a master or slave, and a system can include up to 9 BT1050 or BT1000 units for blowdown control of multiple boilers.
Which mounting methods and power supply conditions does the BT1050 support?
BT1050 supports panel, DIN rail, or baseplate mounting, with a 110-240Vac, 50/60Hz power supply and maximum power consumption of 7.5W. The product is for indoor use only and must be installed in a suitable industrial control panel or fire-rated enclosure.
What communication and fault indication functions does the BT1050 provide?
BT1050 can communicate with adjacent devices via infrared or connect to a 2-wire half-duplex or 4-wire full-duplex RS485 network using Modbus RTU. Its front panel includes an LCD display and five buttons, and it can issue an alarm when a valve fails to open or close.