LTC4R Refrigerated Circulating Bath

The LTC4R (the equipment) consists of a TX150 (the heating circulator) combined with an R4R (the refrigeration unit), with insulated hoses and clips to allow circulation of temperature control fluids to external equipment.
  • University research/teaching - temperature control of external equipment including spectrophotometers & refractometers
  • Circulation of temperature control fluid to jacketed vessels, cooling crystallisation vessels
  • Industrial laboratories - temperature probe calibration, product testing, product QC, temperature control of external equipment
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The Grant LTC4R provides outstanding performance for routine and sophisticated applications requiring accurate temperature control in the range of -30 to 100°C. The LTC4R includes the TX150 heating circulator and an R4R tank/refrigeration unit, complete with insulated tubing and clips to form a system ready to use.

The TX150 Optima™ is high-performance programmable digital heating circulator with an exceptionally simple user interface. This allows fast set-up of multiple parameters through a powerful menu system and provides sophisticated control for temperature-controlled applications.

USB connectivity is available to a PC or laptop. It is programmable with Labwise™ PC software, a software program to set all parameters, including programs, via the PC. Labwise™ also features real-time status windows, a graphic display of the controller's performance as a program is run, and allows data to be logged for future recall and analysis.

  • Powerful pump for external circulation, maximum flow 18 L/min, maximum pressure 310 mbar
  • Full colour QVGA TFT display
  • Setpoint, plus three adjustable preset temperature values
  • Timer function for reaction timing, 99 hours, 59 minutes, with audible alert and heater control
  • Liquid selection safety feature adjusts for temperature range or heater power
  • Fault indication display
  • Programmable relay
  • Two-point user recalibration of internal and external probes (TXPEP, TXSEP)
  • Off-set adjustment for optimal isothermal performance
  • Can be programmed to switch the refrigeration on and off during a heating and cooling program
  • Memory capacity for one program of up to 30 segments
  • Choice of languages: English, French, German, Spanish and Italian
  • Low liquid protection by float switch
  • Adjustable over-temperature cut-out
  • Convenient accessory clamp available for fitting to vessels
  • Stability ± 0.1°C

Note: The refrigeration unit can be switched off independently of the circulator to allow heating only applications. All the refrigeration base units can be used up to a maximum temperature of 100°C.

Input to enable switching of the cooling system by an external device (typically a Grant Advance Optima).

Products in the range



Dimensions (h x d x w) 755 x 515 x 390mm
Capacity 20L
Temperature range -30 to 100ºC
Refrigerant R290
Working Area (d x w) 230 x 305mm
Min/Max liquid level 85/140mm
Cooling power (typical) @20ºC 900W
Cooling power (typical) @0ºC0W 500W
Cooling power (typical) @-10ºC 300W
Cooling power (typical) @-20ºC 180W
Cooling power (typical) @-30ºC 40W
Electrical power (max) 120V 2280W (50-60Hz)
Electrical power (max) 230V 2850W (50Hz)
Relay control (of refrigeration system or external device)
Weight 42.9kg
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Temperature range: 2ºC above the temperature of the coolant


Maximum pressure 1000 mbar, Maximum flow 9 L/min


Maximum pressure 1650 mbar, Maximum flow 12 L/min


Flexible plastic probe, 3m cable


Stainless steel probe, 3m cable

Accessory Notes

Required only where application demands a higher pressure than that delivered by the internal pump to maintain flow

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Product Manuals

LTC4R Manual_EN

Technical Datasheets

No downloads available

Further Information

2 - Refrigerated and Heating Circulators and Chillers
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