Immersion Circulator

What is the Immersion Circulator?

An immersion circulator is a compact heating and pumping unit that clamps onto any suitable bath or vessel to control temperature. It is used for water baths, viscometers and open tanks without buying a full bath system.

Overview

The immersion circulator contains a heater, pump, temperature sensor and controller in a single head that hangs or clamps on the rim of a vessel. The user provides the bath, typically a stainless steel or plastic tank of 5 to 30 liters. Temperature range is commonly ambient to 100 degrees Celsius, or higher with oil, and stability of plus or minus 0.1 to 0.5 degrees is typical. The built-in pump can also circulate fluid to an external loop through hose connections, turning the bath into a temperature control system. Digital and programmable versions offer timers, ramps and alarms. Because only the head is purchased, this format is economical and flexible, and the bath can be replaced if it is damaged. It is widely used for incubation, dissolution testing, viscometry, enzyme assays and general temperature control.

How does it work?

A circulation pump uses a centrifugal or gear impeller to push fluid through a closed loop at a controlled flow rate. The fluid passes through a heated or refrigerated reservoir, then to the application's jacket or heat exchanger, and returns to the reservoir. A temperature sensor measures the bath or the return line, and a PID controller adjusts the heater or refrigeration compressor to hold the setpoint. Pump pressure must be enough to overcome the resistance of the loop, tubing and the application, and flow determines how quickly heat is transferred. Key components are the reservoir, heater, compressor or thermoelectric module, circulation pump, temperature sensor and controller. Cooling capacity and temperature range define the envelope; pump pressure and flow define the loop performance. Some units also offer external temperature control with a probe at the application.

What are the key features?

• Heater, pump, sensor and controller in one head
• Clamps onto any suitable bath or vessel
• Temperature range ambient to 100 °C, higher with oil
• Stability of ± 0.1–0.5 °C
• External circulation through hose connections
• Digital or programmable control with alarms

What are the technical specifications?

A typical immersion circulator configuration offers temperature range of Ambient to 100 °C, higher with oil, temperature stability of ± 0.1–0.5 °C, heating capacity of 1–2 kW, pump flow of 5–15 L/min, bath volume supported of 5–30 L and immersion depth of 80–150 mm. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Immersion Circulator is used in water and oil bath temperature control, viscometry and rheology, enzyme and biological assays, dissolution testing support and open tank incubation. Across the wider Circulation Pumps class, laboratories also deploy it for reactor jacket temperature control, spectrometer and detector cooling and laser and optics thermal management.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-010, IEC 61326-1, ISO 9001 and GB 4793.1. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Use only the recommended fluid and change it periodically, because algae, scale and contaminants reduce heat transfer and can block the loop. Keep the reservoir above the minimum level to avoid pump cavitation and heater damage. Insulate external lines to reduce condensation and heat loss, and use the shortest practical tubing with few restrictions. Vent the loop to release trapped air before setting the controller, because air pockets cause temperature oscillation. Place the unit where ambient heat and dust are low, and clean the condenser or air filter on schedule. Follow IEC 61010-1 for electrical safety and check the pressure rating of the application loop before running at high pump pressure. Record setpoint, fluid and calibration data for traceability.

How do I select the right Immersion Circulator?

Choose an immersion circulator when you already have a suitable bath or want flexibility and lower cost. For a sealed, complete system with refrigeration, choose a full bath. In the RFQ, state bath size, temperature range, stability and whether external circulation is needed.

How does it compare with other Circulation Pumps variants?

Begin with the temperature range and the cooling or heating capacity required at your working temperature, not at the lowest rating. Then check pump flow and pressure, because a high-capacity bath with a weak pump may not circulate adequately through a restrictive jacket or long tubing run. Choose the reservoir volume for the thermal mass and stability you need, and decide between internal control at the bath and external control at the application. Match wetted materials to the fluid; water is standard, but glycol mixtures extend the low-temperature range, and some applications need silicone oil. Consider noise, footprint, drain and fill access, and whether a pressure or flow indicator is included. For unattended operation, look for low-level protection, over-temperature cutout and remote alarm contacts.