S&A HL-12 Water Flow Sensor – Laser Chiller Replacement

LASER PARTS | WATER COOLING & CHILLERS

S&A HL-12 Water Flow Sensor – Laser Chiller Replacement

The S&A HL-12 is a water flow sensor used to monitor coolant circulation in compatible laser water chiller systems. It helps the chiller's monitoring and protection circuitry detect inadequate water flow, an important safeguard for water-cooled CO2 laser tubes.

The sensor features a compact housing with threaded water connections and an attached electrical cable with connector. Its manufacturer-labeled alarm threshold is 30 liters per hour (30 L/h), with a water pressure rating of up to 1.75 MPa.

The HL-12 is a replacement option for compatible S&A / TEYU chiller configurations. Before ordering, confirm that the model, electrical connector, wiring arrangement, and water connections match your existing sensor.

Key Features

• Water Flow Monitoring: Helps compatible chiller control systems identify inadequate coolant circulation.
• 30 L/h Alarm Threshold: Manufacturer-labeled alarm value for monitoring low-flow conditions.
• 1.75 MPa Pressure Rating: Maximum water pressure identified on the sensor housing.
• Threaded Water Connections: Inline connection design for installation in a compatible cooling circuit.
• Attached Electrical Connector: Includes an attached wiring lead and connector for compatible equipment.
• Replacement Application: Suitable for replacing a matching HL-12 sensor in a compatible laser water chiller.

Product Specifications

Brand	S&A / TEYU
Model Number	HL-12
Product Type	Water Flow Sensor
Manufacturer-Labeled Alarm Value	30 L/h (0.5 L/min)
Maximum Water Pressure	1.75 MPa
Water Connections	Threaded Male Inlet and Outlet
Electrical Connection	Attached Wiring Lead with Connector
Application	Compatible Laser Water Chiller Monitoring Systems
Rabbit Laser USA SKU	00057

Specification Note: The alarm threshold and pressure rating are taken from the sensor's identification label. The 30 L/h value is an alarm threshold, not the normal operating flow rate of a laser chiller.

Chiller Compatibility

HL-12 water flow sensors are commonly associated with certain S&A / TEYU laser water chiller configurations, including applications within the CW-3000, CW-5000, and CW-5200 product families.

Compatibility varies by chiller generation and internal components. Different versions may use different flow sensors, wiring arrangements, or electrical connectors.

Before ordering, compare the replacement sensor with your existing component, including:

• Existing sensor model number
• Electrical connector and wiring arrangement
• Threaded inlet and outlet dimensions
• Mounting position and available clearance
• Chiller model and hardware revision

Important: This product is not guaranteed to fit every CW-3000, CW-5000, or CW-5200 chiller. Confirm compatibility with your specific chiller and existing sensor before purchasing.

Installation & Safety

• Turn off and disconnect the chiller and laser machine from electrical power before servicing.
• Drain or isolate the cooling water as necessary before removing the existing sensor.
• Confirm that the replacement sensor's threaded connections match the existing water lines.
• Install the sensor in the correct water flow direction according to its housing markings and equipment documentation.
• Verify the electrical connector and wiring configuration before reconnecting the sensor.
• Refill the cooling system and remove trapped air according to the chiller manufacturer's instructions.
• Inspect all water connections for leaks.
• Verify proper coolant circulation and test the chiller's flow-protection function before operating the laser.

Safety Note: Never bypass a water flow protection circuit to operate a laser machine. Inadequate cooling water circulation can cause serious damage to a CO2 laser tube.