What is the difference between a water bath and a circulator?

A water bath primarily heats samples immersed directly within its tank. A circulator, like the GD120, includes a pump to circulate temperature-controlled fluid to external equipment, in addition to its internal bath function.

Can this unit be used for temperatures below ambient?

For temperatures below ambient, a cooling coil connected to an external chiller would typically be required, particularly for stainless steel tank versions. Plastic tanks are generally limited to ambient +5°C and above.

What type of liquid should be used in the bath?

For temperatures up to 99°C, distilled or deionised water is commonly used. For higher temperatures or specific applications, silicone oil or glycol mixtures may be required, with the unit often having settings to optimise performance for different liquid types.

How often does the bath liquid need to be changed?

The frequency of liquid changes depends on usage and the type of liquid. For water, regular changes (e.g., weekly or bi-weekly) are recommended to prevent algae growth and maintain purity. For oils, changes are less frequent but depend on degradation.

Is this unit suitable for continuous operation?

Yes, laboratory water baths and circulators like the Grant GD120 are designed for continuous operation, offering stable and reliable temperature control over extended periods.

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Grant GD120 Stirred Water Bath

Used Grant GD120 Stirred Water Bath - Water Baths & Heating Baths, photo 1

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Used Grant GD120 Stirred Water Bath - Water Baths & Heating Baths, photo 7

Used Grant GD120 Stirred Water Bath - Water Baths & Heating Baths, photo 8

Used Grant GD120 Stirred Water Bath - Water Baths & Heating Baths

used Equipment

Available

Verified seller

Grant GD120 Stirred Water Bath

Name: Grant GD120 Stirred Water Bath
Brand: Grant GD120 Stirred Water Bath
SKU: 40841.SR3B
Price: 420 GBP
Availability: InStock

Price: £ 420

This listing is for the Grant GD120 Water Bath/Circulator.

The unit is in full working condition and is ready for immediate use.

The Grant GD120 is a digitally controlled stirred water bath and circulator ideal for laboratory use, offering high precision and flexibility.

Here's a breakdown of its features and capabilities:

Key Features

Immersion Thermostat with Intelligent Control Optimisation (ICO): Enables adaptive PID control for exceptionally stable temperature regulation.
Integral Pump: Built-in circulation pump with a maximum flow rate of 17 L/min, allowing both sample immersion and external fluid circulation.
User Interface: Equipped with a clear digital display, a rotor plus two-key control, timer function for reaction timing, and visual + audible alarms to notify operators of critical conditions.
Preset Temperature Control: Supports one adjustable operating setpoint plus three preset temperature options for fast switching.
Safety Features: Includes float-switch low liquid protection and an adjustable over-temperature cut-out for sample and user safety.
Liquid Type Selection: Automatically adjusts heater power and temperature parameters depending on chosen liquid (e.g., water, oil, glycol mixtures).

Temperature Range & Accuracy

Plastic Tanks (P-series): From around ambient +5 °C up to ~99 °C.
Stainless Steel Tanks (S-series): From –15 °C up to ~120 °C.
High Stability: ±0.02 °C for stable temperature control.

Technical Specifications & Obsolescence

The GD120 series includes multiple tank sizes: plastic tanks (P5, P12, P18) and stainless steel tanks (S5, S12, S18, S26, S38), offering varied capacities for different lab needs.

This series is now considered obsolete, though it remains functional and reliable for many applications.

Supporting Documentation & Manual

Operating Manual: The GD120 is covered by the general purpose stirred thermostatic baths manual (shared with GD100), outlining temperature settings, calibration procedures, safety guidance, and maintenance.
Datasheet Summary: Positioned within the broader Grant Optima product range, the GD120 sits between simpler (GD100, up to 100 °C) and higher-spec models (GR150 up to 150 °C, GP200 up to 200 °C)

Cambridgeshire, United Kingdom

5,773 km away

Model Number

Grant GD120 Stirred Water Bath

Stock Number

40841.SR3B

Machinery Masters View

Typical context for this category of equipment. Always confirm specifics with the seller.

Precise temperature control for laboratory samples in research and development.
Calibration of sensors and thermometers requiring a stable thermal environment.
Material testing where consistent temperature conditions are critical.
Enzyme reactions and cell culture studies demanding accurate temperature regulation.
External circulation to maintain temperature in jacketed vessels or other apparatus.

Typical volume capacity: For this model class, capacities commonly range from 5 to 20 litres, depending on the specific tank configuration.
Temperature range: Units of this type typically operate from ambient +5°C up to 99°C for plastic tanks, and up to 120°C for stainless steel tanks, when using appropriate liquids.
Temperature stability: High-precision stirred water baths like the GD120 commonly offer stability of ±0.02°C or better.
Circulation pump flow rate: Integrated pumps on these units typically provide a maximum flow rate of around 15-17 L/min for both internal stirring and external circulation.
Power supply: Units of this nature typically require a standard single-phase electrical supply, commonly 230V, 50/60Hz, with a power consumption dependent on heater size.
Safety features: Common safety features include low liquid level protection and adjustable over-temperature cut-out.

A water bath primarily heats samples immersed directly within its tank. A circulator, like the GD120, includes a pump to circulate temperature-controlled fluid to external equipment, in addition to its internal bath function.

Water baths and heating baths are generally valued in laboratory and biotech settings for their reliability and precision temperature control. When purchasing used units, buyers typically prioritize checking heating uniformity, control system functionality, and tank condition to avoid corrosion issues. These devices are known for their durability and long operational lifespan when properly maintained. Industry sentiment favors established brands known for consistent performance and availability of spare parts.

General overview for this equipment type

Machinery Masters Intelligence. General guidance for this category of equipment only, not a substitute for the seller's exact specifications. Always confirm details with the seller.