LTC4R Refrigerated Circulating Bath

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.


  • 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


Dimensions (h x d x w) 755 x 515 x 390mm
Capacity 20L
Temperature range -30 to 100ºC
Refrigerant R134a
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


Product Manuals:

Further Information:


Chillers – Heat Exchange Coil

Attach to a supply of cooling tap water or a refrigerated circulator

Part No


CW5 Temperature range: 2ºC above the temperature of the coolant

Vertical Turbine Pump

Low noise, compact design. Supplied with pipe connections and special lid for fitting to tanks, pipe bore 12.7mm.

Part No


VTP1-LT Maximum pressure 1000 mbar, Maximum flow 9 L/min
VTP2-LT Maximum pressure 1650 mbar, Maximum flow 12 L/min

Accessory Notes

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