Thermostatic oil bath

Introduction

A thermostatic oil bath is a laboratory instrument used to provide a constant and a uniform temperature for the heating of the samples, using the oil as the heating medium, and it is used in the chemistry, the biochemistry, the food, and the research laboratories for the reactions and the processes that require the controlled heating at the temperatures above the boiling point of the water. The thermostatic oil bath consists of a bath tank, a heating system, a temperature control system, a stirring system, and, in some models, a circulator, and it heats the oil, such as the silicone oil or the mineral oil, to the set temperature, and it maintains the temperature with a high stability and uniformity, with features such as the digital temperature control, the over-temperature protection, and the stirring; the thermostatic oil bath is used for the heating of the reaction vessels, for the reflux, for the distillation, for the incubation at the high temperatures, for the melting of the waxes and the polymers, for the temperature-sensitive reactions, and for many other applications, and it is available in various sizes and temperature ranges, with the different bath capacities; the thermostatic oil bath provides a stable and a uniform heating at the high temperatures, which is important for the many processes, and it is an essential instrument for the controlled heating in the laboratory. Thermostatic oil baths are used in the chemistry and the biochemistry laboratories, in the food industry, in the pharmaceutical industry, in the research institutions, and for many other applications. With their high-temperature control, thermostatic oil baths are essential for the controlled heating.

Thermostatic Oil Bath LTOB-T2014

Thermostatic Oil Bath features a large capacity of 22 readouts of both set and actual temperatures. Additional user-friendly features include a ring-shaped butterfly lid that enhances th...

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Thermostatic Oil Bath LTOB-T2013

Thermostatic Oil Bath comes with a capacity of 16 function that automatically adjusts heating performance to maintain precise temperature. The oil bath has a microcomputer temperature co...

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Thermostatic Oil Bath LTOB-T2012

Thermostatic Oil Bath features a capacity of 10 for easy monitoring and control. Our oil bath is suitable for precise and uniform heating in chemical reactions, and sample incubation. Th...

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Thermostatic Oil Bath LTOB-T2011

Thermostatic Oil Bath has a capacity of 6 microcomputer temperature controller, ensuring accurate and consistent temperature regulation. The oil bath supports timing from 0 to 999 minute...

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Thermostatic Oil Bath LTOB-T2010

Thermostatic Oil Bath has a capacity of 3 technology intelligently adjusts the heating rate to prevent overshooting and maintain stable conditions. Additionally, it includes a ring-shape...

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Standards

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. Thermostatic oil bath for precise high-temperature heating and incubation of samples using thermal oil.

2. Heated bath with stainless steel tank, digital PID controller, circulation pump and temperature range up to 200-300 C.

3. Suitable for chemical synthesis, pharmaceutical, material testing, educational and industrial laboratory applications.

4. Includes bath body, heating element, temperature controller, oil (if included), lid, power cord and manual.

5. Supports controlled heating of flasks, reactors, samples and materials at stable temperatures from ambient to 200-300 C.

FAQ

Q1: What testing scenarios is this bath mainly applied to?

A: The thermostatic oil bath is used in chemical synthesis, pharmaceutical, material testing, educational, and industrial laboratories for precise, stable high-temperature heating of samples and vessels using thermal oil as the heat transfer medium, providing uniform temperature and higher maximum temperature (200-300 C) than water baths (which max at ~100 C). It supports chemical synthesis (heating reaction flasks (round-bottom, Erlenmeyer) for organic synthesis, polymerization, condensation, reflux, distillation - oil bath provides uniform heating and precise temp control; better than heating mantle for temperature stability and uniformity; oil can be stirred/circulated for even heating), pharmaceutical (API synthesis, crystallization, drug formulation testing, stability studies at elevated temp, melt point determination, sample preparation), material testing (polymer/plastic testing (heat deflection, melt flow, softening point), asphalt/bitumen testing (softening point, ductility, viscosity at temp), wax/petroleum testing, adhesive curing, thermal cycling of materials), educational (chemistry labs, demonstrations, student experiments requiring controlled high temp), industrial QC (raw material testing, process simulation, quality control of products requiring high-temp exposure), and research (kinetic studies at controlled temp, phase transition measurements, sample digestion (acid digestion at high temp - though block digesters are more common), evaporation/concentration). Oil bath principle: A tank holds thermal oil (silicone oil, mineral oil, or polyethylene glycol) heated by electric heating element; a digital PID controller maintains set temperature (+/- 0.1-1 C); a circulation pump or stirrer ensures uniform oil temperature; samples (flasks, beakers, vials) are immersed in oil (or jacketed reactor circulates oil through jacket). Oil provides excellent heat transfer and can reach 200-300 C (depending on oil type: silicone oil up to 200-300 C, mineral oil ~150-180 C, PEG ~200 C). Compared to water bath: higher temp range, no boiling at 100 C, but oil is more hazardous (flammable at high temp, hot oil burns, smoke/fumes). Compared to heating mantle: more uniform temperature, easier to control, can heat multiple vessels, but oil can be messy and is a fire hazard at high temp. Some oil baths are circulators (pump oil to external jacketed reactor) - called heating circulator; others are static baths (immerse samples directly).

Q2: What standards does the bath comply with?

A: The thermostatic oil bath follows relevant ISO, ASTM, IEC and GB/T standards including ISO 1778 (lab equipment - general), IEC 61010 (laboratory electrical equipment safety), IEC 60335 (household/similar, if applicable), ASTM standards for specific material tests (e.g., ASTM D36 (softening point of bitumen - ring and ball apparatus uses oil bath), ASTM D1525 (Vicat softening temperature), ASTM D648 (heat deflection temperature), ASTM E145 (gravimetric/oven? no)), and GB/T standards for thermostatic baths. The hardware complies with applicable temperature accuracy (+/- 0.1-1 C, uniformity +/- 0.5-2 C), safety (over-temperature protection (independent thermostat), low-oil-level cutoff, thermal insulation), and electrical safety (IEC 61010, proper grounding, IP rating). For specific material tests (bitumen, polymers), follow ASTM/ISO test method requirements (temperature ramp rate, bath fluid type, sample geometry). For pharmaceutical use, follow cGMP and equipment qualification (IQ/OQ). For regulated labs (ISO 17025), maintain calibration records (temperature calibration with certified thermometer, as-found/as-left data, uniformity mapping). For flammable oil use, follow fire safety codes (no open flames, fume extraction, fire extinguisher (Class B for oil fires)). Oil type must be appropriate for max temperature (do not exceed oil flash point - risk of fire).

Q3: What is the warranty period for the whole bath and key components?

A: The whole thermostatic oil bath is covered by a 12-24 month warranty (lab equipment often 1-2 years). The bath body, heating element, controller, pump/stirrer, and housing are covered, while thermal oil (consumable - degrades over time at high temp (oxidation, viscosity change, darkening); replace periodically), gaskets/seals (wear), and fuses are consumables/accessories. Damage from improper use, running dry (no oil - heating element burns out, fire risk; MUST have oil before heating), over-temperature (exceeding oil flash point or bath rating - fire, oil degradation), oil contamination (water in oil (causes splattering/boiling when heated - keep oil dry; chemical spills in oil), using wrong oil (wrong temp range, flammable), liquid spills on electronics, or unauthorized repair is excluded. Extended warranty and service contracts (calibration, element replacement) may be available. Heating element lasts 3-7 years; controller 5-10 years; pump/stirrer 3-7 years; thermal oil needs replacement every 6-18 months depending on use/temp (dark, viscous, smoking = replace).

Q4: Is this device difficult to operate? Is professional training required?

A: Operation is straightforward for basic heating (fill with oil, set temp, immerse samples). No professional training required for routine use, but high-temperature oil safety is critical (burns, fire). We provide operation manuals. Proper setup (place on stable, heat-resistant bench (not wood/plastic - use ceramic/metal surface; keep flammables away), ensure proper ventilation (oil fumes/smoke at high temp - use fume hood or local exhaust; silicone oil fumes can be irritating), connect power (dedicated circuit, proper grounding - baths draw high current (1-3 kW); do not use extension cords), fill with appropriate thermal oil (select oil for temp range: silicone oil (200-300 C, stable, low vapor pressure, expensive), mineral oil (150-180 C, cheap, smokes at high temp), polyethylene glycol (PEG, water-soluble, ~200 C, but hygroscopic); fill to indicated level (do not overfill (oil expands when heated, can overflow); do not underfill (element exposed -> burnout/fire); ensure no water in oil (water causes violent splattering when heated - keep oil dry, store covered), allow room for sample immersion (oil level rises when samples added), pre-operation (check oil level (add if low), inspect oil (clean, no water/contamination; if dark/smelly, replace), verify over-temp protection set (typically 10-20 C above setpoint or per manufacturer), ensure samples are dry (water on outside of flask causes splattering when immersed in hot oil - wipe dry), operation (set temperature on controller (PID; allow 15-60 min to reach setpoint and stabilize, especially high temp), if circulation/stirrer: turn on pump (ensures uniform temp; for static bath, oil may have temperature gradients - stir if possible), immerse samples slowly (lower flasks into oil gently (sudden immersion can cause oil splash, thermal shock to glass); clamp flasks securely (do not let flask touch bottom/element (hotspot, breakage); use clamp/stand; ensure flask opening is above oil level (oil does not enter flask)), monitor temperature (controller display; for critical work, verify with certified thermometer), do not leave unattended at high temp (fire risk, oil degradation), for exothermic reactions in flask: monitor closely (oil bath cannot remove heat fast if reaction runs away - use cooling or remove from bath), post-operation (turn off heater, allow oil to cool (do not remove hot samples immediately - use tongs/heat-resistant gloves; hot oil burns are severe; let oil cool to <50 C before handling/cleaning), remove samples carefully (wipe oil from flask exterior with paper towel (oil is messy; dispose oily towels properly), cover bath (prevent dust/water contamination, reduce evaporation), if oil is contaminated/degraded: drain and replace (dispose used oil as hazardous waste per regulations - do not pour down drain), maintenance (daily: check oil level, wipe exterior, verify temp; weekly: clean exterior, inspect oil condition, check for leaks; monthly: verify temperature calibration, clean tank (if needed), inspect heating element; semi-annually/annually: professional calibration, element resistance check, pump/stirrer service, oil replacement, troubleshooting (temperature not reaching (oil level low (element exposed), heating element failed, controller fault, power issue (voltage low, circuit breaker), insulation poor, oil wrong (too high viscosity poor heat transfer) - check oil, replace element, service, check power), temperature unstable/overshoot (controller PID tuning, oil volume too small, sensor placement, door/lid opening frequently - adjust PID, increase oil, minimize openings), oil smoking/burning (temperature too high (exceeding oil flash point/decomposition - lower temp, use higher-temp oil), oil degraded (replace), water in oil (splattering, boiling - drain, replace with dry oil), oil leaking (tank crack, seal failure, overflow from expansion - inspect, reduce fill level, repair), pump not circulating (pump failure, air lock, oil too viscous (cold) - service, bleed air, warm oil), bath tripping breaker (overcurrent (element short, power issue), circuit too small - check element, use dedicated circuit, and safety (HIGH TEMPERATURE BURN HAZARD (oil at 150-300 C causes severe burns (worse than water because oil has high heat capacity and sticks to skin); NEVER touch hot oil or bath exterior with bare hands; use heat-resistant gloves, tongs, face shield; allow to cool before handling; do not splash oil), FIRE HAZARD (thermal oil can ignite if heated above flash point (mineral oil ~150-200 C, silicone ~300+ C); never exceed oil flash point; keep flammables (solvents, paper) away; have Class B fire extinguisher (CO2 or dry chemical - NOT water (water spreads oil fire)); use fume hood/ventilation (oil fumes); do not leave unattended at high temp), WATER IN OIL (water in hot oil boils instantly and splatters violently (can cause burns, oil spill); ensure oil is dry, samples are dry, cover bath when not in use (prevent condensation); if water gets in, drain and replace oil), OIL DEGRADATION (oil oxidizes at high temp over time (darkens, becomes viscous, smokes, lower flash point - increased fire risk); replace periodically (6-18 months depending on use); do not use degraded oil), ELECTRICAL (high current, proper grounding, dedicated circuit, do not use with wet hands, do not spill oil on electronics, unplug before service (lockout/tagout)), GLASS HAZARD (hot glass flasks can break from thermal shock (cold flask in hot oil, or hot flask touched by cold); lower samples slowly, use borosilicate glass, do not add cold liquid to hot flask in bath), do not run dry (MUST have oil covering element before turning on heater; dry operation burns out element and can cause fire), do not overfill (oil expands when heated - overflow, fire hazard; fill to mark, account for sample displacement), for reactions with flammable solvents in flasks: ensure no solvent vapors reach hot oil surface (use condenser, fume hood; solvent spill on hot oil = fire), do not use mineral oil above 150-180 C (smokes, degrades, fire risk - use silicone for higher temps), dispose used oil as hazardous waste (do not pour down drain), for asphalt/polymer testing: follow ASTM method (specific oil type, temp ramp rate, sample preparation)) are critical for safe oil bath 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 calibration recommended every 6-12 months (or per quality system) using a certified thermometer (PT100 or mercury-free, traceable to national standards); verify at multiple points across range (e.g., 50, 100, 150, 200 C); accuracy typically +/- 0.1-1 C, uniformity +/- 0.5-2 C (measure at multiple locations in tank: top/bottom, center/edges). If bath is moved, heating element replaced, controller serviced, or readings seem off, recalibrate. Routine verification: check set temp vs reference thermometer periodically (monthly), and use process controls (e.g., melting point standard) for critical applications. For ISO 17025/commercial labs, follow applicable schedules and maintain records (calibration certificates, as-found/as-left data, thermometer ID, uniformity mapping). For material testing (ASTM methods), temperature accuracy and ramp rate may be specified in the method - calibrate accordingly. Over-temperature protection should be tested periodically (simulate over-temp to verify cutoff). Oil should be replaced based on condition (not just schedule) - dark, viscous, smoking oil should be changed immediately.

Q7: Are supporting consumables universal?

A: Thermal oil (consumable - silicone oil, mineral oil, PEG; universal from lab supply (Sigma-Aldrich, Fisher, Julabo, Lauda) but use oil rated for your max temp; do not mix oil types), gaskets/seals (specific to bath model), fuses (standard), and cleaning supplies are available from lab supply companies, though some seals and pump parts are bath-specific (use OEM or certified compatible). Long-term consumable cost includes thermal oil replacement (periodic, $50-$500 depending on volume/type - silicone is more expensive but lasts longer at high temp).

Q8: Can I customize parameters or supporting accessories?

A: Customization includes tank capacity (2 L, 5 L, 10 L, 20 L, 30 L, 50 L - small lab to industrial), temperature range (ambient to 150 C (mineral oil), 200 C (standard silicone), 300 C (high-temp silicone/special oil)), type (static bath (immerse samples) or circulating bath (pump oil to external jacketed reactor/colony - heating circulator; more versatile, precise)), precision (basic (+/- 0.5 C) or high-precision (+/- 0.01 C, PID, for critical work)), control (analog (dial) or digital (LED/LCD, PID, programmable ramp/soak, timer)), features (circulation pump (internal/external), stirrer, over-temperature protection (independent), low-oil-level cutoff, lid (reduces evaporation/contamination), drain valve (for easy oil change), stainless steel tank (304/316), thermal insulation, data logging/USB output), safety (over-temp cutoff, low-oil cutoff, IP rating, explosion-proof (ATEX) for flammable areas), accessories (thermal oil (initial), flask clamps/stands, sample racks, lid, spare heating element, temperature probe, calibration certificate (ISO 17025), certifications (CE, ISO 9001, IEC 61010, ATEX), language and accessories. Additional oil, clamps, and accessories can be ordered separately.

Q9: Does the purchase include on-site installation and commissioning service?

A: Standard delivery includes thermostatic oil bath, heating element (integrated), controller, power cord, and instruction manual (oil often NOT included - order separately). On-site installation is not required for standard oil baths (unbox, place on heat-resistant surface, fill with oil, plug in, calibrate, use). On-site training is not included for standard orders but can be arranged at additional cost (for industrial/QC teams on safe operation, oil selection, calibration, maintenance, and specific ASTM test methods). Remote guidance provided. For high-precision circulating baths or ATEX units: on-site commissioning may be recommended. Always fill with oil BEFORE turning on heater (dry operation damages element/fire risk), and calibrate temperature before first use.

Q10: What types of samples are compatible with this equipment?

A: The thermostatic oil bath heats various samples/vessels including glass flasks (round-bottom, Erlenmeyer, Florence - for reactions, reflux, distillation), beakers, test tubes, vials (sample incubation, heating), jacketed reactors (via circulating oil - external connection), material specimens (polymers, bitumen, wax, asphalt, adhesives - for softening/melt testing per ASTM), and metal/ceramic samples (heat treatment, tempering small parts). NOT compatible with: Samples requiring >300 C (exceeds oil bath range - use muffle furnace or metal bath), samples requiring below-ambient cooling (oil bath heats only; for cooling use refrigerated circulator), volatile/flammable samples without proper containment (solvent vapors near hot oil = fire risk - use condenser, fume hood, sealed vessels), water-containing samples (water in oil causes splattering - ensure vessels are dry externally; aqueous samples inside sealed vessels are OK), samples that attack oil (strong oxidizers, reactive chemicals - can react with oil; use alternative heating), and very large vessels (must fit in tank and not touch element/bottom). For flask heating: ensure flask is clamped, does not touch bottom (hotspot), and opening is above oil. For external circulation: ensure jacketed reactor is compatible (oil inlet/outlet, pressure rating). For bitumen/polymer testing: follow ASTM method for sample geometry and oil type. IMPORTANT: Thermostatic oil bath fundamentals: (1) What it is: A heated tank of thermal oil used to heat samples/vessels at precise, uniform temperatures above 100 C (water bath limit). Oil transfers heat uniformly and stably. Range: ambient to 200-300 C depending on oil. (2) Heat transfer fluids (oils): - Silicone oil: Most common for lab use. Stable to 200-300 C (some to 400 C). Low vapor pressure, low toxicity, high oxidation resistance. Expensive. Brands: Dow Corning (DC 200), Rhodorsil, Julabo. - Mineral oil (paraffin): Cheap. Useful to ~150-180 C. Smokes and degrades above 180 C. Higher fire risk. For low-temp use. - Polyethylene glycol (PEG): Water-soluble (easy cleanup), to ~200 C. Hygroscopic (absorbs water -> splattering). For moderate temps. - Petroleum-based heat transfer oils: Industrial, to ~300 C. Higher toxicity/fire risk. - Selection: Max temp must be below oil flash point by safety margin (20-50 C). Check manufacturer specs. (3) Oil bath vs other heating: - Water bath: To 100 C only, safer, cheaper, easier cleanup. For samples <100 C. - Oil bath: To 200-300 C, uniform, precise. More hazardous (fire, burns), messy. For >100 C. - Heating mantle: Conforms to round-bottom flask, no oil mess, but less uniform temp, harder to control, can overheat. For single flask. - Hot plate/stirrer: Direct contact heating, magnetic stirring. Less uniform for large flasks. For beakers. - Block digester: Aluminum block with holes for tubes. For parallel sample digestion. No oil mess. - Sand bath: Sand instead of oil. Higher temp, but less uniform, messy. - For multiple flasks or precise uniform temp: oil bath preferred. (4) Key safety: - Fire: Oil can ignite above flash point. Never exceed rating. Keep flammables away. Class B extinguisher. - Burns: Hot oil sticks to skin, severe burns. Gloves, face shield, cool before handling. - Water in oil: Violent splattering. Keep oil dry, samples dry. - Dry operation: Element burns out, fire. Always fill oil first. - Overfill: Oil expands, overflows. Fill to mark. - Oil degradation: Replace when dark/smoking. (5) Temperature control: - PID controller: Maintains setpoint with minimal overshoot. - Circulation/stirring: Ensures uniform temp (without, top can be 5-10 C cooler than bottom). - Over-temp protection: Independent thermostat cuts power if exceeds limit (safety). - Calibration: Verify with certified thermometer periodically. (6) Common applications by temp: - 40-80 C: Incubation, enzyme reactions, melt point of low-temp materials (waxes). - 80-120 C: Reactions, drying, asphalt softening (ring and ball). - 120-180 C: Organic synthesis, polymerization, polymer testing (Vicat, HDT), oil-based reactions. - 180-250 C: High-temp synthesis, material testing, curing, silicone oil required. - 250-300 C: Special high-temp oil, extreme caution (fire, fumes). (7) Common errors: - Running dry (no oil) -> element burnout, fire. - Using mineral oil at 200 C -> smoking, degradation, fire. - Water in oil -> splattering, burns. - Overfilling -> overflow. - Flask touching bottom -> hotspot, glass break. - No clamp -> flask tips over, spills. - Leaving unattended at high temp -> fire, degradation. - Not calibrating -> wrong temp, invalid results. - Using water bath oil? (no - use appropriate thermal oil). - Hot oil disposal down drain -> environmental hazard (collect as hazardous waste). - Cooling oil with water -> splatter, fire (let cool naturally). (8) Choosing the right oil bath: - Max temp needed: <150 C -> mineral oil/cheap; 150-200 C -> standard silicone; >200 C -> high-temp silicone/special. - Volume: Small (2-5 L) for 1-2 flasks; large (20-50 L) for multiple/reactor. - Precision: Routine -> +/- 0.5 C; critical synthesis -> +/- 0.01 C circulating. - External circulation: If heating jacketed reactor -> circulating bath with pump. - Safety: Over-temp protection, low-oil cutoff, insulation. - Budget: Basic analog (cheap) vs digital PID (more precise) vs high-precision circulating (expensive).