Introduction
A high temperature circulator is a temperature control instrument that provides a circulating fluid at the high temperatures, for the heating of the equipment and the processes, and it is used in the laboratories, the industry, the research, and the many other applications. The high temperature circulator consists of a bath or a reservoir for the circulating fluid, a heating system, a circulating pump, a temperature control system, and, in some models, a cooling system, and it heats the fluid, such as the water, the oil, or the silicone fluid, to the high temperatures, and it circulates the heated fluid through the external equipment or the process that requires the heating, with a high stability and uniformity, with features such as the digital temperature control, the circulation control, and the safety; the high temperature circulator is used for the heating of the reaction vessels, for the heating of the condensers and the columns, for the temperature control of the processes, for the heating of the analytical instruments, for the calibration, and for many other applications, and it is available in various temperature ranges and heating capacities, from the models for the moderate temperatures to the models for the high temperatures; the high temperature circulator is an essential equipment for the temperature control in the many applications. High temperature circulators are used in the laboratories, in the chemical and the pharmaceutical industry, in the research, in the food industry, and for many other applications. With their high temperature circulation, high temperature circulators are essential for the heating and the temperature control.
High Temperature Circulator LHTC-T2021
High Temperature Circulator operates from RT+5℃ to 250℃ and supports both material testing and reaction-based applications. Its closed system prevents contamination in setups like bio-...
High Temperature Circulator LHTC-T2019
High Temperature Circulator offers a working temperature range from RT+5℃ to 160℃ with capability to serve as a stable heat source for external systems. It includes a cooling coil that...
High Temperature Circulator LHTC-T2020
High Temperature Circulator offers a working temperature range from RT+5℃ to 250℃ enabling controlled heating in industrial and lab processes. The built-in cooling coil allows external...
High Temperature Circulator LHTC-T2018
High Temperature Circulator offers a working temperature range of RT+5℃ to 250℃ with suitability for stable thermal delivery in industrial setups. The closed circulation system reduces...
High Temperature Circulator LHTCR-T2017
High Temperature Circulator operates from room temperature to 200°C making it suitable for tasks that need consistent thermal control. The integrated filter helps prevent blockage durin...
High Temperature Circulator LHTCR-T2016
High Temperature Circulator operates from room temperature to 200°C with suitability for thermal tasks in labs and pilot setups. This circulator ensures strong fluid movement to maintai...
High Temperature Circulator LHTCR-T2015
High Temperature Circulator offers a wide operating range from ambient to 200°C, supporting varied heating needs in labs and units. Its closed circulation system protects fluid quality ...
High Temperature Circulator LHTCR-T2014
High Temperature Circulator operates from room temperature to 200°C, ensuring stable and reliable heat transfer for thermal applications. The built-in circulation system supports steady...
High Temperature Circulator LHTCR-T2013
High Temperature Circulator operates within a working temperature range from RT to 200°C, ensuring reliable thermal performance for various heating needs. It is equipped with advanced o...
High Temperature Circulator LHTCR-T2012
High Temperature Circulator operates from ambient to 200°C, enabling stable performance for fluid heating applications. Its corrosion-resistant interior ensures long-term compatibility ...
High Temperature Circulator LHTCR-T2011
High Temperature Circulator operates within a working temperature range from RT to 200°C, offering reliable control for external thermal applications. It includes a built-in filter that...
High Temperature Circulator LHTCR-T2010
High Temperature Circulator offers a working temperature range from RT to 200°C, ensuring reliable thermal control. It includes a closed-loop system that reduces fluid loss during exten...
Standards
DIN 12876-1-Laboratory electrical equipment-Laboratory circulators and thermostats
ASTM E2488-09(2014)-Standard Guide for the Preparation and Evaluation of Liquid Baths Used for Temperature Calibration by Comparison
Complies with the above standards, but is not limited to them.
Features
1. High temperature circulator for precise heating circulation up to 200-300 degrees C in laboratory and industrial processes.
2. High-temperature thermoregulation system with thermal oil for accurate heating of reactors, baths and equipment.
3. Suitable for chemical, pharmaceutical, materials, petroleum, research and industrial high-temperature applications.
4. Includes heater, thermal oil bath, circulation pump, temperature controller, over-temperature protection and operation manual.
5. Supports precise high-temperature control for reactors, distillation, polymerization, materials testing and industrial processes.
FAQ
Q1: What testing scenarios is this circulator mainly applied to?
A: The high temperature circulator is used in chemical synthesis, pharmaceutical manufacturing, materials research, petroleum testing, and industrial processes to provide precise, high-temperature (typically ambient to 200-300 degrees C) circulation of heat transfer fluid (thermal oil) for heating reactors, vessels, distillation columns, autoclaves, and test equipment requiring elevated temperatures with accurate control. It supports chemical synthesis (high-temperature reactions (reflux at 150-250 degrees C, polymerization, condensation reactions, organometallic synthesis), reactor heating (jacketed glass and stainless steel reactors, autoclaves - precise temperature control for exothermic/endothermic reactions at high temperature), distillation (high-boiling compound distillation (heavy oils, waxes, polymers - requires high boiler temperatures; short-path distillation, wiped film evaporation), pharmaceutical (API synthesis (high-temperature reactions, crystallization at elevated temperature, solvent evaporation), polymerization (resin synthesis (epoxy, polyester, phenolic, acrylic), polymer processing, curing, crosslinking - precise temperature control affects molecular weight and properties), materials research (polymer characterization (melting, curing, degradation studies at controlled high temperatures), materials testing (tensile/fatigue testing at elevated temperature, thermal conductivity, creep testing), asphalt and bitumen testing (rolling thin film oven (RTFO), pressure aging vessel (PAV) - high temperature aging of asphalt binders; typically 163 degrees C for RTFO), petroleum (oil and wax testing (pour point, cloud point, viscosity at high temperature), distillation of crude fractions, lubricant testing), food and beverage (high-temperature processing (UHT, sterilization, cooking, frying simulation), chocolate and confectionery (tempering, enrobing)), and industrial processes (chemical manufacturing, reactor heating, distillation, curing ovens, and any process requiring precise high-temperature circulation up to 200-300 degrees C).
Q2: What standards does the circulator comply with?
A: The high temperature circulator follows relevant IEC, ISO, ASME and GB/T standards including IEC 61010 (safety requirements for electrical laboratory equipment), ASME Boiler and Pressure Vessel Code (for pressure vessels/piping if applicable), and GB/T standards for temperature control equipment. The hardware complies with applicable EMC standards (IEC 61326) and machinery safety standards (ISO 13849). For pharmaceutical/biotech use, follow GMP requirements (21 CFR Part 11 for electronic records if applicable, IQ/OQ/PQ validation). Calibration should use certified temperature sensors (RTD, thermocouple traceable to national standards). For high-temperature operation, ensure heat transfer fluid is rated for the maximum temperature (thermal oil degradation, fire hazard). Safety standards for thermal oil systems (NFPA, DIN 4754) may apply for industrial installations.
Q3: What is the warranty period for the whole circulator and key components?
A: The whole high temperature circulator is covered by a 12-month warranty. The heater, thermal oil bath/vessel, circulation pump, temperature controller, over-temperature protection, heat exchanger, and housing are covered, while thermal oil (consumable - degrades over time at high temperature), filters, seals, gaskets, pump seals, and fuses are consumables or accessories. Damage from improper use, overheating (exceeding maximum temperature - causes thermal oil degradation, fire hazard, seal damage), using wrong heat transfer fluid (not rated for high temperature - causes degradation, fuming, fire), fluid loss (low oil level - heater burnout, pump cavitation), oil degradation/coking (from overheating or oxidation - damages system), pump failure, or unauthorized repair is excluded. Extended warranty may be available. Heater elements and pump have finite lifespan at high temperatures (typically 3-7 years depending on usage and maintenance).
Q4: Is this device difficult to operate? Is professional training required?
A: Operation requires trained process technicians or engineers familiar with high-temperature systems, thermal oil safety, and process safety. We provide operation manuals and training. Proper system setup (place on stable, heat-resistant floor (high-temperature units get hot on exterior - ensure non-combustible surface; maintain clearance from flammable materials); ensure adequate ventilation (thermal oil fumes if overheated, heat dissipation; ensure fume extraction or proper room ventilation); connect power (3-phase for high-wattage heaters (3-30 kW); dedicated circuit with proper amperage; ensure voltage/frequency matches); connect to process (reactor jacket/coil, distillation pot, etc.) with high-temperature rated tubing (stainless steel braided PTFE, stainless steel rigid piping - ensure all components rated for max temperature and pressure; insulate lines to prevent heat loss and burns; for high-temperature operation, do not use plastic or rubber tubing (melts)), fill with appropriate thermal oil (select oil rated for maximum temperature (mineral oil up to 250-300 degrees C, synthetic oil (diphenyl ether/diphenyl mixture) up to 350-400 degrees C, silicone oil up to 200-250 degrees C; ensure oil is compatible with seals (Viton, Kalrez, PTFE for high temp; EPDM is NOT suitable for oils/high temp); fill to proper level (do not overfill (thermal expansion - oil expands when heated, can overflow; do not underfill (heater exposure, cavitation)); purge air from system (air causes oxidation, cavitation, pump noise; run pump at low temperature, open bleed valves; top off after heating (oil expands, level changes)), temperature setting (set desired temperature (typical range ambient to 200-300 degrees C; do not exceed oil maximum temperature or system maximum; set ramping rate (typical 1-5 degrees C/min for high-temperature systems - rapid ramping causes thermal stress, oil degradation, seal damage; allow gradual heat-up), set over-temperature protection (independent safety thermostat set 10-20 degrees C above working temperature - cuts heater if exceeded; critical for fire prevention), operation monitoring (oil temperature (inlet/outlet), process temperature, oil level, heater status (on/off, power percentage), pump status (flow, pressure), oil condition (watch for fuming, darkening, viscosity change - signs of degradation; if oil fumes or smokes, reduce temperature immediately (overheating); check for leaks (oil leaks at high temperature are fire hazard - inspect fittings regularly), safety procedures (high-temperature burn hazard (oil at 200-300 degrees C causes severe burns; insulate lines; use heat-resistant gloves, face shield, long sleeves; do not touch uninsulated lines; allow cooling before servicing), fire hazard (thermal oil at high temperature can ignite if leaked (flash point of mineral oil ~200-250 degrees C; at operating temperature near/above flash point, leaks can ignite; ensure no ignition sources; have fire extinguisher (Class B for oil fires) accessible; do not leave unattended at high temperature; over-temperature protection is mandatory), oil degradation (thermal oil oxidizes and degrades at high temperature, especially with air exposure (open systems); degradation causes coking (carbon deposits), increased viscosity, acidity, reduced heat transfer, and fire hazard; monitor oil condition (color, odor, viscosity, acid number); replace oil per manufacturer schedule or condition (typically 1-2 years for continuous high-temp use), do not mix different oil types (incompatible oils can react or degrade), maintenance (oil level check (daily or before each use - top off with same oil type), oil condition check (every 3-6 months - visual (darkening, particulates), viscosity, acid number; send oil sample for analysis if critical use), filter replacement (in-line oil filters every 3-6 months - remove carbon particulates from degradation), coil/heater inspection (check for coking/carbon buildup on heater (reduces heat transfer, causes hot spots; clean or replace if coked), pump seal inspection (check for leaks; high-temperature seals degrade faster - replace if weeping), temperature sensor calibration (every 6-12 months), seal/gasket replacement (periodic - high-temp seals harden and leak), fluid replacement (every 1-2 years or when degraded - drain old oil, flush system with compatible flush oil, refill with fresh oil; dispose of waste oil per hazardous waste regulations), and documentation (batch records, temperature logs, maintenance records for GMP; oil change records, safety checks) are important for safe, reliable high-temperature operation.
Q5: What is the typical lead-time for order delivery?
A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.
Q6: Is regular calibration required? What is the recommended calibration cycle?
A: Temperature sensor calibration recommended every 6-12 months using certified RTD/thermocouple (verify at multiple high-temperature points (e.g., 100, 150, 200, 250 degrees C; verify both internal oil sensor and external process sensor; at high temperatures, sensor drift can be more significant). Temperature control accuracy verification every 3-6 months at multiple set points (including maximum working temperature; verify overshoot and stability). Over-temperature protection verification every 3-6 months (test that safety thermostat cuts heater at set limit - critical safety function). Flow rate verification every 6-12 months. Routine performance check before each high-temperature run (oil level, leaks, heater function, pump function). Full system performance verification annually (temperature accuracy, stability, heat-up rate, over-temperature function, oil condition). For GMP/regulated use, follow applicable calibration schedules and maintain records (calibration certificates, temperature logs, maintenance records, oil analysis reports). High-temperature systems require more frequent safety checks than low-temperature systems due to fire and burn hazards.
Q7: Are supporting consumables universal?
A: Thermal oil (mineral thermal oil (up to 250-300 degrees C, inexpensive, but flammable and oxidizes), synthetic thermal oil (diphenyl oxide/diphenyl mixture (e.g., Dowtherm A, Therminol 66 - up to 350-400 degrees C, more stable, but more expensive and may be toxic), silicone oil (dimethyl polysiloxane - up to 200-250 degrees C, low toxicity, but expensive and can be hard to clean; not for >250 degrees C), food-grade thermal oil (for food/beverage applications - NSF H1 certified); selected based on maximum temperature, toxicity, flammability, and cost; use only oil rated for system maximum temperature; do not mix oils), filters (in-line oil filters (stainless steel mesh, pleated - remove carbon particulates; size-specific), seals/gaskets (Viton/FKM (up to 200-250 degrees C), Kalrez/FFKM (up to 300+ degrees C, expensive), PTFE/Teflon (up to 260 degrees C, chemical-resistant; selected for oil compatibility and temperature; EPDM and nitrile are NOT suitable for oils/high temperature), pump seals (mechanical seals with high-temperature rated materials), cleaning supplies (oil absorbent (for spills), degreaser, flush oil (for system cleaning during oil change)), and fuses are available from industrial/laboratory suppliers, though seals, pump parts, and filters may be system-specific. Long-term consumable cost includes thermal oil (periodic replacement - can be expensive for large systems (10-100 L; synthetic oils are costly), filters, seals, and occasional heater/pump replacement.
Q8: Can I customize parameters or supporting accessories?
A: Customization includes temperature range (ambient to 200 degrees C (standard, mineral oil), ambient to 300 degrees C (high-temp, synthetic or premium mineral oil), ambient to 400 degrees C (very high-temp, specialized synthetic oil (diphenyl ether), requires pressurized system), heating capacity (1-30 kW - selected based on process heat load and required ramping rate; calculate P = m * Cp * dT/dt + heat loss; add safety factor 1.5x), bath volume (2-50 L - larger volume = more thermal stability, but slower heat-up and more oil cost; small volume = fast response, less oil), flow rate (5-50 L/min - selected for process jacket/coil; ensure turbulent flow for good heat transfer), pump type (gear pump (high pressure, for viscous oils and closed systems), centrifugal (high flow, low pressure), magnetic drive (hermetic, no seal leakage - preferred for toxic/expensive oils, but lower pressure)), system type (open bath (oil exposed to air - simple, but oil oxidizes faster (air contact), limited to below flash point; not for >200 degrees C with mineral oil), closed/pressurized (oil in sealed system with expansion tank - prevents oxidation, allows higher temperatures (above flash point safely), more complex but safer for high temp; preferred for >200 degrees C), control type (PID (standard), programmable (ramp/hold profiles, multiple steps), cascade (process temp -> oil temp - tighter control), auto-tuning), communication (USB, RS485, Ethernet, Modbus, Profibus, OPC UA), safety features (over-temperature protection (independent safety thermostat - mandatory), low oil level shutdown (prevents heater burnout), overpressure protection (pressure relief valve), emergency stop, flow switch (shuts heater if no flow), leak detection, phase monitor, motor overload), construction (stainless steel bath (304 or 316L - corrosion-resistant), powder-coated or stainless steel exterior, insulated housing (reduces exterior temperature and heat loss), high-temperature gaskets/seals, casters (lockable, for mobility), explosion-proof (ATEX/IECEx Zone 1/2 - for flammable solvent environments; requires explosion-proof electricals, sealed enclosure), GMP-compliant (sanitary design, documentation, IQ/OQ, 21 CFR Part 11), language and accessories. Additional high-temperature tubing, insulation, oil, filters, and accessories can be ordered separately.
Q9: Does the purchase include on-site installation and commissioning service?
A: Standard delivery includes the high temperature circulator, power cord, basic accessories (tubing sometimes) and instruction manual. On-site installation, commissioning, oil filling, leak testing, initial heat-up, and training are NOT included for standard orders but are STRONGLY RECOMMENDED and can be arranged at additional cost (high-temperature systems involve fire and burn hazards; professional installation ensures proper setup, safety, and compliance). Remote guidance is provided. For self-installation: ensure proper power (3-phase), ventilation, fire safety, high-temperature rated connections, correct thermal oil, and gradual initial heat-up (to remove moisture and cure seals). Do not operate at high temperature without verifying all safety features.
Q10: What types of processes are compatible with this equipment?
A: The high temperature circulator heats various processes requiring elevated temperatures including chemical reactors (jacketed glass reactors (50 mL to 20 L), stainless steel reactors, autoclaves, pressure reactors - for high-temperature synthesis (reflux, condensation, polymerization, organometallic); precise temperature control at 100-250 degrees C; exothermic reactions at high temperature require careful control (though this unit only heats (no cooling) - for exothermic reactions, a heating/cooling circulator is needed; high-temp circulator is for endothermic or isothermal heating), distillation (distillation columns (fractional, vacuum distillation), short-path distillation, wiped film evaporation - for high-boiling compounds (heavy oils, waxes, polymers, fatty acids, essential oils); boiler/pot heating to 150-250 degrees C; condenser cooling requires separate chiller (this unit only heats)), polymerization (resin synthesis (epoxy curing, polyester condensation, phenolic resin, acrylic polymerization - typically 100-200 degrees C; precise temperature control affects reaction rate, molecular weight, and crosslink density; some polymerizations are exothermic (monitor and control)), curing (coatings, adhesives, composites - thermal curing at 80-200 degrees C; post-curing at elevated temperatures), materials testing (asphalt/bitumen (RTFO aging at 163 degrees C, PAV aging at 100 degrees C under pressure - standard tests for asphalt binder performance; high-temperature circulator provides precise heating for these test apparatuses), polymers (melting, crystallization, thermal degradation studies at controlled temperatures; DMA/TMA sample chambers), metals (heat treatment, tempering, annealing for small samples (though furnaces are more common for >300 degrees C)), petroleum (viscosity measurement at high temperature (lubricants, heavy oils - typically 40-150 degrees C), distillation of crude fractions, pour point/cloud point testing (requires cooling too - this unit only heats)), food and beverage (cooking, frying simulation, UHT processing (ultra-high temperature 135-150 degrees C for seconds), chocolate tempering (precise heating/cooling cycles - requires cooling too), confectionery processing), and industrial processes (chemical manufacturing, reactor heating, distillation, curing, and any process requiring precise high-temperature heating up to 200-300 degrees C with circulation). IMPORTANT: High temperature circulator (heating only) vs heating/cooling circulator: (1) High temperature circulator (this equipment): ONLY HEATS (ambient to 200-300 degrees C); no cooling capability; for processes requiring only heating (reflux, distillation boiler, curing, isothermal heating at high temp); cannot handle exothermic reactions (no cooling to remove reaction heat); cannot cool down quickly (natural cooling only - slow). (2) Heating/cooling circulator (high/low temp): BOTH HEATS AND COOLS (-40 to +200 degrees C typical); for processes requiring temperature changes (heat up, cool down), exothermic reactions (cooling removes heat), and dynamic temperature control; more complex and expensive (compressor for cooling). If your process requires cooling (exothermic reactions, rapid cooling, low-temperature steps), you need a heating/cooling circulator, not a heating-only circulator. Thermal oil selection and safety: (1) Mineral thermal oil: Inexpensive, widely available, good heat transfer, but flammable (flash point 200-250 degrees C), oxidizes at high temperature (especially in open systems), max temperature 250-300 degrees C (depending on grade). For open systems, do not exceed 200 degrees C (below flash point for safety; above flash point, oil fumes can ignite). (2) Synthetic thermal oil (diphenyl oxide/diphenyl, e.g., Dowtherm A, Therminol VP-1): Higher max temperature (350-400 degrees C), better thermal stability, less oxidation, but more expensive, may be toxic (diphenyl oxide has strong odor, potential health hazards), and some types are eutectic mixtures that solidify at room temperature (require heat tracing to prevent solidification in lines). For closed/pressurized systems only (above flash point). (3) Silicone oil: Low toxicity, good thermal stability, wide temperature range (-80 to +200 degrees C), but expensive, can be difficult to clean (silicone residue), and not for >250 degrees C (degrades). Good for lab-scale and low-toxicity requirements. (4) Food-grade oil: NSF H1 certified for incidental food contact (food/beverage processing); more expensive. Thermal oil degradation: At high temperatures, thermal oil degrades through: (1) Oxidation (reaction with oxygen - forms acids, sludge, carbon; accelerated by air contact (open systems), high temperature, and contaminants; use closed system or nitrogen blanket to prevent oxidation; antioxidants in oil help but are consumed). (2) Thermal cracking (at very high temperatures (>300 degrees C for mineral oil) - oil molecules break down, forming lighter fractions (lower flash point, fire hazard) and carbon (coking on heater surfaces). (3) Contamination (water, process fluids, particulates - water causes foaming and pressure spikes; process fluids can react with oil). Signs of degradation: darkening color, strong odor, increased viscosity, increased acid number, particulates/coking, fuming at operating temperature, reduced heat transfer (heater coking). Monitor oil condition annually (or every 6 months for continuous high-temp use) with oil analysis (viscosity, acid number, flash point, water content, insolubles). Replace oil when degraded (do not continue using degraded oil - fire hazard, equipment damage). High-temperature safety: (1) Burn hazard: Oil at 200-300 degrees C causes severe, third-degree burns on contact. Insulate all lines and fittings. Use PPE (heat-resistant gloves, face shield, long sleeves, closed-toe shoes). Do not touch uninsulated surfaces. Allow system to cool (<50 degrees C) before servicing. (2) Fire hazard: Thermal oil at or above flash point can ignite if leaked. Ensure no ignition sources (open flames, sparks, hot surfaces) near oil lines. Have Class B fire extinguisher (dry chemical, CO2, or foam) accessible. Over-temperature protection is mandatory (independent safety thermostat). Do not leave unattended at high temperature. Ensure proper ventilation (oil fumes). Do not exceed oil maximum temperature. (3) Pressure hazard: Closed/pressurized systems can build pressure from oil expansion and vapor. Ensure pressure relief valve is functional. Do not exceed design pressure. Use pressure-rated components. (4) Electrical hazard: High-wattage heaters (3-phase) can cause electric shock. Ensure proper grounding, dedicated circuit, qualified electrician for installation. Lockout/tagout before servicing. (5) Environmental: Waste thermal oil is hazardous waste (flammable, potentially toxic). Dispose per local regulations (do not pour down drain). Recycle or use licensed waste disposal. Oil spills should be contained with absorbent and disposed properly. Maintenance is critical for high-temperature systems: poor maintenance (low oil, degraded oil, coked heater, worn seals) is the leading cause of failures and fires. Follow manufacturer maintenance schedule strictly.
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