DLS (DLSB) Recirculating Chillers and Cooling Thermostats

Laboratory and industrial recirculating chillers DLS / DLSB: DLS-50/30 series, compact DLSB chillers, compressors, and coolant circulation pumps.

DLS / DLSB 50/30 recirculating chillers

The DLS / DLSB 50/30 cooling thermostat with a 50 L bath provides thermal stabilization for chemical reactors and rotary evaporators across -20 to +25 °C with cooling power up to 8.5 kW.

Internal corrosion-resistant stainless steel bath volume of 50 liters
Operating fluid circulation temperature range spanning -20 to +25 °C
High-performance coolant circulation pump delivery up to 70 L/min
Cooling capacity ratings from 8520 to 2170 W on standard 220 V supply

DLS / DLSB 5–20 L compact lab chillers

The DLS / DLSB compact cooling range includes DLSB-5/10, 5/40, 10/10, 20/20, and 20/30 units engineered for benchtop laboratory apparatus with cooling down to -40 °C and precision PID control.

Tank capacities of 5, 10, and 20 liters for benchtop and mobile lab layouts
Deep temperature cooling reaching -40 °C in specialized 5/40 units
Circulation pump output up to 35 L/min with delivery head of 4 to 6 meters
Cold-rolled steel protective enclosure finished with durable powder coat

DLS / DLSB refrigeration compressors and condensers

Hermetic compressor units for DLS / DLSB chillers operate on modern refrigerants with automated delay relays, electrical overload protectors, and internal thermal motor cutoff systems.

Fully hermetic refrigeration compressors mounted on vibration dampening pads
Integrated motor overload cutouts and temperature safety limit relays
Automatic restart delay timers preserving balanced refrigerant pressures
Compatible with standard R22 and eco-friendly R404A refrigerant formulations

DLS / DLSB coolant circulation pumps

Integrated circulation pumps in DLS / DLSB units supply cooled fluids to external jacketed reactors and condensing loops at up to 70 L/min without risk of fluid contamination or cavitation.

Corrosion-proof fluid contact impellers and stainless steel pump components
Standard pagoda barb hose connections for reliable leak-free fluid loops
Hydraulic discharge delivery head delivering 6 to 8 meters circulation push
Continuous duty ratings with water-glycol solutions and pure ethanol media

DLS / DLSB temperature controllers and PT100 sensors

The microprocessor control panel on DLS / DLSB chillers couples high-visibility LCD screens with precision PT100 sensors to deliver thermal stabilization accurate to within ±0.1 °C.

Precision platinum PT100 temperature sensor offering fast dynamic response
Microcomputer PID temperature controller with dual set/actual displays
Bath temperature stabilization accuracy maintained down to tenths of a degree
Visual and audible alarm indicators for thermal limits and sensor anomalies

DLS / DLSB condenser coils and heat exchangers

Heat-exchanging condenser coils in DLS / DLSB systems are fabricated from seamless copper tubing with protective nickel electroplating to resist chemical vapors and corrosive atmosphere.

Seamless copper refrigeration tubing protected by continuous nickel plating
High thermal conductivity optimizing heat dissipation and vapor condensation
Extended operational lifetime against harsh chemical vapors and laboratory air
Pressure tested brazed joints ensuring zero loss of refrigerant charge over time

Refrigeration thermodynamic cycles and thermal load calculation of DLS-50/30

Industrial and laboratory chillers DLS / DLSB 50/30 series are engineered for continuous heat dissipation from exothermic glass reactors and distillation equipment.

The internal bath capacity of 50 liters establishes a stable thermal ballast volume that dampens temperature fluctuations during chemical synthesis. Across its -20 to +25 °C operating range, the hermetic refrigeration system delivers cooling capacities ranging from 8520 down to 2170 W.

Balanced performance between the hermetic compressor, finned air condenser, and nickel-plated immersion coil ensures efficient heat exchange directly within the circulating fluid bath.

Coolant fluid selection and low-temperature freeze protection protocols

Operating at sub-zero temperatures requires specialized non-freezing heat transfer media in DLS / DLSB chillers. For operation down to -20 °C, technical water-glycol mixtures containing 40 to 50 percent ethylene glycol by volume or denatured ethanol of appropriate concentration must be utilized.

Pure distilled water may only be used when set bath temperatures remain strictly above +5 °C. Using pure water below +5 °C risks evaporator freeze-up, internal tubing rupture, and severe cavitation of the circulation pump impeller.

External fluid loop design and delivery circulation pump characteristics

The integrated circulation pump in the DLS-50/30 delivers cooled media to external apparatus with a flow rate up to 70 L/min and delivery head pressure of 6 to 8 meters. Discharge and return ports feature pagoda hose barb fittings accepting reinforced flexible hoses with 16 to 20 mm inner diameter.

When designing external cooling circuits for jacketed reactors, minimizing overall line length and avoiding abrupt flow restrictions preserves high coolant velocity through the jacket, preventing localized hotspots in reaction media.

Microprocessor PID temperature regulation and PT100 sensor calibration

Precise thermal stabilization across DLS / DLSB chillers is governed by a microcomputer digital controller with 0.1 °C resolution. Temperature sensing relies on an industrial platinum PT100 resistance thermometer immersed in the high-velocity fluid mixing zone.

Digital PID control logic continuously balances measured temperature against setpoint targets by throttling solenoid injection valves and modulating compressor duty cycles, maintaining bath temperature stability within ±0.2 °C.

Integration with rotary evaporators and jacketed glass reaction vessels

In laboratory operations, DLS / DLSB recirculating chillers are paired with 5, 10, 20, and 50 liter rotary vacuum evaporators to achieve efficient condensation of volatile solvent vapors.

Feeding cooled heat transfer fluid through condenser coils eliminates vapor bypass into vacuum pumps, protecting sensitive diaphragm mechanisms from chemical degradation.

On chemical reactor setups, liquid chillers ensure isothermal operation during temperature-sensitive crystallization and synthesis.

Diagnostic procedures and scheduled preventive maintenance for DLS / DLSB

Routine maintenance for DLS / DLSB cooling systems entails monitoring refrigerant suction and discharge pressures, cleaning air condenser finning with dry compressed air, and inspecting electrical contacts on the main power contactor.

Semi-annual service requires verifying coolant fluid concentration and replacing inline hydraulic filter elements. If circulation flow rates drop, technicians inspect the magnetic pump drive coupling and flush the impeller cavity to remove debris.

Evacuation protocols and precision refrigerant recharging procedures

Restoring circuit integrity after valve replacements or brazing on DLS / DLSB cooling units necessitates deep two-stage vacuum evacuation.

A two-stage vacuum pump connects via low and high side Schrader service access ports to extract moisture and non-condensable atmospheric gases from internal heat exchanger passages.

Refrigerant replenishment with R22 or R404A is carried out using electronic charging scales matching rating plate specifications to prevent motor strain and compressor liquid slugging.

Engineering quotation practice and system selection from Bitrix24 records

Industrial client inquiries documented in Bitrix24 demonstrate steady demand for complete DLS-50/30 cooling thermostat units (part 26220081) for chemical processing plants.

Engineering calculations focus on selecting optimal chiller capacities to handle peak reaction heat loads across 5 to 50 liter vessels. Rigorous alignment of operating temperature envelopes and delivery pump flow rates guarantees dependable uninterrupted operation across commercial pilot plants.

DLS / DLSB and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of DLS / DLSB and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.