Spirax Sarco BC3150 boiler blowdown controller is designed for steam boilers and regulates total dissolved solids (TDS) by controlling the opening and closing of a blowdown valve. It operates with Spirax Sarco conductivity sensors, boiler blowdown valves, or condensate discharge valves. The controller supports panel, DIN-rail, or base mounting and is powered by a 99 to 264 Vac supply. The front panel features a 3-digit LCD display and five-button keypad. Parameter settings are stored in non-volatile flash memory and must be confirmed by pressing the OK button after changes are made.

Key Features

• Blowdown controller with temperature compensation

• Type approval for TDS control and limiting applications

• Operates with CP10, CP30, and CP32 conductivity sensors

• Wide range: 1 - 9990 μS/cm or ppm – (x1, x 10, x 100 x 1000)

• LCD display of sensor probe condition

• Infrared communications

• UL and TÜV approved

Approvals

• BC3150 complies with EMC Directive 2014/30/EU and its requirements for Class A environments, such as industrial locations. Detailed EMC assessment reference: UK Supply BH BC3150 2008.

• Complies with the Low Voltage Directive and the safety requirements of EN 61010 - 1:2001 for electrical equipment used for measurement, control, and laboratory applications.

• Type-tested as a TDS controller in accordance with Vd TÜV Water Control Equipment 100(07:2006) and UL listed (open).

Functions

• All ranges and operating parameters can be selected through the software menu and configured using the two lower buttons.

• After configuration, the TDS value is displayed in μS/cm; ppm can also be selected.

• When conductivity exceeds the set point, the TDS value and ‘bLd’ are displayed alternately. The valve relay is energized until conductivity falls below 5% of full-scale value below the set point.

• When conductivity exceeds the alarm value, the TDS value and ‘AL’ are displayed alternately. The valve relay is energized until conductivity falls below 3% of full-scale value below the alarm point.

• During system purging, the TDS value and ‘Pur’ are displayed alternately. The valve relay is energized until conductivity falls below 5% of full-scale value below the set point.

Inputs

• Accepts signals from Spirax Sarco conductivity sensors CP10, CP30, or CP32.

• A PT100 temperature sensor can be connected to provide temperature compensation (2%/°C). This is recommended where boiler operating pressure varies. When no PT100 is installed, the default temperature setting is 184°C (10bar g).

Outputs

• Pulsed output: small boilers can use pulsed blowdown (10 seconds on, 20 seconds off) to prevent boiler water-level fluctuations from triggering a low-water alarm.

• Standard 4 - 20 mA output for remote TDS display or as an input signal to a computer management system.

Additional Features

• All configuration parameters are password protected to prevent incorrect settings.

• Infrared communication with adjacent Spirax Sarco boiler controllers. Products located within the specified range can communicate through the infrared bus, allowing OEM product parameters to be transferred to equipment with RS485 on the user side. The product can only be configured as an IR slave.

Technical Data

Item	Details
Power supply	Voltage: 110 - 240Vac, 50/60HZ; power consumption: 7.5W (maximum)
Environment	Indoor use only; maximum altitude: 2000 m (6562ft); temperature range: 0 - 55 °C; 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) - minimum IP54 or UL50 / NEMA Type 3, 3S, 4, 4X, 6, 6P, or 13
Enclosure rating (front panel only)	NEMA Type 4 hose-down protection (UL certified) and IP65 (TRAC Global certified)
LVD (safety)	Electrical safety: EN 61010 - 1; UL61010 - 1, 3rd Edition, 2012 - 05; CAN/CSA - C22.2 No. 61010 - 1, 3rd Edition, 2012 - 05 Issue6
EMC	Immunity / emissions applicable to heavy industrial locations
Enclosure	Material: polycarbonate
Front panel material	Silicone rubber, 60 shore
Solder	Tin / lead (60/40%)
Power and signal connectors	Plug-in terminal blocks (use only terminals supplied by Spirax Sarco with screw connectors; otherwise safety and approvals may be compromised)
Cable / wire and connector data	Cable size: 0.2 mm² (24 AWG) - 2.5 mm² (12 AWG); strip length: 5 - 6 mm
TDS cable / wire	Type: high-temperature; shielding: shielded; size: 1 – 1.5 mm² (18 - 16 AWG); maximum length: 0 - 9.99 range - 10 m; 0 - 99.90 range - 30 m; recommended types: Prysmian (Pirelli) FP200, Delta Crompton Firetuf OHLS
Pt100 cable / wire	Type: high-temperature, twisted pair; shielding: shielded; number of cores: 3; size: 1 - 1.5 mm² (18 - 16 AWG); maximum length: 100 m (328 ft); recommended type: various
4 - 20 mA cable / wire	Type: twisted pair; shielding: shielded; number of pairs: 1; size: 0.23 - 1 mm² (24 - 18 AWG); maximum length: 100 m (328 ft); recommended type: various
Probe type	CP10, CP30, and CP32
Water conductivity range	0 – 9.99 ppm or µS/cm; 0 – 99.9 ppm or µS/cm; 0 – 999 ppm or µS/cm; 0 – 9990 ppm or µS/cm
Input technical data	Accuracy: ± 2.5% FSD (Poss > if high EMC); μS/cm-to-ppm conversion factor: 0.7; neutralization factor: 0.7; drive resolution: 0.1% FSD ac – 4-core
Temperature compensation (TC)	Sensor type: Pt100 – Class B or better; range: 0 - 250 °C (if no Pt100 is installed – user-defined temperature 100 - 250 °C, resolution 1 ℃); accuracy: ± 2.5% FSD – system accuracy ± 5%; resolution: 0.1% FSD; drive: dc – 3 wires
Probe	Maximum voltage: 32 Vdc
Cleaning	Drive: pulse (1 second on, 1 second off); time: 20 seconds; minimum current: 0 mA
4 - 20 mA	Maximum current: 20 mA; open-circuit voltage (maximum): 19 Vdc; resolution: 0.1% FSD; maximum output load: 500 ohm; insulation: 100 V
Output	Output rate: 10 / second
Output relay	Contacts: 2 x single-pole changeover relays (SPCO); rated voltage (maximum): 250 Vac; resistive load: 3 amp @ 250 Vac; inductive load: 1 amp @ 250 Vac; AC motor load: ¼ HP (2.9 amp) @ 250 Vac; 1 / 10 HP (3 amp) @ 120 Vac; pilot duty: C300 (2.5 amp) - control circuit / coil; electrical life (operations): 3 x 10⁵ or greater, depending on load; mechanical life (operations): 30 x 10⁶

Safety Information, Installation, and Maintenance

• Warning: This document does not contain sufficient information for safe product installation. The product operates at hazardous voltages. Consult the installation and maintenance guide supplied with the product before installation.

• Caution: Ensure that there is no condensation inside the product before installing and connecting the power supply wires.

• Installation: DIN-rail, base, or panel mounting. Install in a suitable industrial control panel or flameproof enclosure with a minimum rating of IP54 (EN 60529) or Type 3, 3S, 4, 4X, 6, 6P, and 13 (UL50/NEMA 250). Spirax Sarco supplies suitable plastic and metal enclosures.

• Installation restrictions: Do not install outdoors without additional weather protection. Do not attempt to open the product. Do not obstruct the infrared signal between products.

• Standards: In the United Kingdom, follow IEE regulations (BS 7671). In other regions, follow the applicable local regulations. All wiring materials and procedures must comply with the relevant EN and IEC standards.

• Maintenance: No special servicing, preventive maintenance, or product inspection is required. Boiler water-level controls and alarms must be tested and inspected. Health and safety guidance PM5 provides general guidance.

Weight

475g

How to Order

Example: 1 Spirax Sarco BC3150 boiler blowdown controller.