DYNEO DD 4L Refrigerated and Heating Circulators

Category Stirred / Circulating Baths
Manufacturer Julabo
Country of manufacture Germany

New temperature control technology for demanding applications DYNEO DD heating circulators for internal and external applications are equipped with closed bath tanks. The tanks are well insulated and include a coil for counter-cooling. An integrated drain tap makes emptying the tank safe and clean. The multilingual 3.5-inch color display and unique rotary knob provide for straightforward and intuitive operation.

Available in 2 different size configurations to accommodate your lab's requirements. DYNEO thermostats can optionally be equipped with analogue and digital interfaces.


  • USB connection
  • Removable ventilation grid
  • Space-saving cooling coil design provides more usable space in the bath tank
  • For internal and external applications
  • Powerful and infinitely adjustable pressure pump
  • Flow rate 27 l/min, pressure 0.7 bar
  • Easy switching between internal and external circulation
  • Large color TFT display, multilingual interface
  • Central rotary knob (controller) simplifies operation
  • Integrated programmer
  • Integrated external Pt100 connection
  • RS232 interface or analog interfaces (optional)
  • Powerful cooling machines
  • Optimized cooling coil design saves space in the bath tank
  • Bath cover included with delivery
  • Integrated drain makes emptying liquid easy and safe.
Key Attributes
Type Stirred / Circulating Baths
Incubation Yes
Refrigeration Yes
Temp Range (°C) A -20 to 200 (DD-300F model is -25)
Capacity (L) 3 to 4
Circulation 8-27 l/min
Brand Julabo
MaxFlow Rate (l/min) 27
Temp Stability (°C) ±0.01
Timer Yes
Alarms Yes
Digital or Mechanical Digital or analog option
Data connection USB and Optional analog or RS232 connection
Tank Material Stainless Steel
Sample Agitation No
Media Racks Available No
Warranty (years) 1
Weight (lb) Varies by model
Width (in) Varies by model
Depth (in) Varies by model
Height (in) Varies by model


Manufacturer Specifications





Dimensions (W × L × H)

9.1 x 15.4 x 25.6 in.

17.3 x 16.1 x 17.3 in.

9.4 x 16.5 x 26 in.

Filling volume

3 ... 4 l


56.7 lbs

54.5 lbs

61.1 lbs

Pump connections

M16x1 male

Barbed fittings inner diameter

8/12 mm

Working temperature range

-20 ... +200 °C

-20 ... +200 °C

-25 ... +200 °C

Temperature stability

±0.01 °C

Setting the resolution of the temperature display

0.01 °C

Ambient temperature

+5.0 ... +40.0 °C

Data based on voltage version:

115V/60Hz (Nema N5-15 Plug)

Heating capacity

1 kW

Cooling capacity (Medium: Ethanol)

200°C = 0.2 kW / 20°C = 0.2 kW / 10°C = 0.17 kW / 0°C = 0.15 / -10°C = 0.1 / -20°C = 0.02 kW

200°C = 0.3 kW / 20°C = 0.3 kW / 10°C = 0.3 kW / 0°C = 0.27 / -10°C = 0.19 / -20°C = 0.08 kW

Pump capacity flow rate

8 ... 27 l/min

Pump capacity flow pressure

1.5 ... 10.2 psi

Viscosity max.

50 cST

Refrigerant stage 1


Global Warming Potential for R134a


Filling volume

70 g

100 g

Carbon dioxide equivalent

0.1 t

0.143 t

Bath tank

Stainless steel

Bath cover


Usable bath opening (W x L / D)

5.1 x 5.9 / 5.9 in.

Cooling of compressor

1-stage Air

Classification according to DIN12876-1

Classification III (FL)

Pump function

Pressure Pump

Pump type

Immersion Pump

External pt100 sensor connection


Integrated programmer

8x60 steps

Temperature control


Absolute temperature calibration

3 Point Calibration

Temperature displayTemperature display

3.5" TFT Display

Temperature settingTemperature setting

Shaft Encoder

Electronic Timer hr:min

99 ... 59


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