Industrial Hot Air Oven

October 06, 2026

Principal Specifications

Parameter	Offered/Proposed Specification
Proposed model	HE-HAO-250P
Equipment type	Forced-Air Circulation Programmable Hot AirOven
Application	Preheating and curing of epoxy-resin-cast CTs, PTs, moulds, components and assemblies
Useful chamber size	12" (W) × 12" (D) × 12" (H)
Temperature range	Ambient +10°C to 250°C
Maximum working temperature	250°C
Standard curing cycle	5° Per Hour to 1°C minutes at 250°C
Approximate complete cycle	120 minutes, depending on load and operating conditions
Approximate equipment weight	70 kg, subject to final approved design

Temperature-Control System

Parameter	Offered/Proposed Specification
Primary control	Programmable PID temperature control
Temperature display	Simultaneous Set Value (SV) and Process Value (PV) display
Temperature accuracy	±1°C or better at the controller
Temperature uniformity	±2.5°C or better at stabilized conditions under a properly distributed normal load
Temperature sensors	Class A PT100 RTD – 9 Nos.
Program storage	Minimum 1 programs/ 16 recipes
Cycle programming	Programmable heating, soaking and cooling stages
Timer	Programmable cycle timer
Secondary safety control	Independent over-temperature safety controller/thermostat
Control-panel location	Floor-mounted, wall-mounted or side-mounted, depending on final layout

Heating System

The oven is electrically heated using low-watt-density, sheathed tubular Incoloy/Inconel air heaters. The heaters are installed inside an isolated recirculating-air duct or plenum, preventing direct radiant heating of the product.

Parameter	Offered/Proposed Specification
Heating-element type	Sheathed tubular Incoloy/Inconel air heaters
Proposed heater capacity	Approximately 5 kW
Heater arrangement	Distributed inside an isolated recirculation duct/plenum
Heater control	Thyristor-based three-phase proportional power controller
Power-controller type	Slim three-phase electronic power controller
Component brands	Autonics, Schneider Electric, L&T or equivalent reputed brands
Heat distribution	Indirect forced-convection heating
Heater safety interlock	Heater operation interlocked with the air-circulation blower

Air-Circulation and Exhaust System

A heavy-duty centrifugal blower continuously recirculates heated air through engineered ducts, plenums and adjustable baffles. This arrangement minimizes temperature variation throughout the usable chamber.

Parameter	Offered/Proposed Specification
Air circulation	High-volume forced-air recirculation
Blower assembly	Heavy-duty motor-driven blower – 1 No.
Proposed blower motor	continuous-duty
Proposed airflow capacity	Approximately Uniform in Whole Chamber
Air distribution	Engineered rear plenums with suitable internal baffles
Fresh-air inlet	Adjustable fresh-air provision
Exhaust system	Adjustable vapour-exhaust outlets with damper arrangement
Exhaust points	One vapour-exhaust points, as per final process design
Cooling performance	Designed to cool to approximately 70°C within 30 minutes after heater shutdown, subject to load, ambient conditions and airflow settings

Construction

Parameter	Offered/Proposed Specification
Construction type	Heavy-duty, multi-wall insulated industrial construction
Inner chamber	SS 304, approximately 2 mm thick
Inner working base	SS 304, 2 mm thick
Outer body	Heavy-duty powder-coated MS/GI sheet
Optional exterior	Complete SS 304 external body for GMP applications
Insulation	Minimum 100 mm high-density ceramic-wool/ceramic-fibre insulation
Insulation properties	Low thermal conductivity, high-temperature stability and resistance to smoke or fumes
Door arrangement	Heavy-duty insulated double-leaf industrial door
Door locking	Positive-locking system with heavy-duty latch
Door gasket	High-temperature silicone gasket
Door safety	Electrical limit switch and safety interlock
Loading arrangement	Heavy-duty removable trolley/tray system
Trolley capacity	Minimum 200 kg uniformly distributed load
Trolley construction	SS 304 or fabricated MS structure, depending on the process
Trolley movement	Heavy-duty wheels/rollers with floor-guide or track arrangement

PLC–HMI Features (Optional)

Main power and control-panel ON/OFF functions

Automatic and manual operating modes

Cycle start, stop, pause and reset controls

Programmable heating, soaking and cooling cycles

Minimum 10-program recipe storage

Real-time Set Value and Process Value display

Real-time temperature trend graph

Independent control and monitoring of the circulation blower

Heater operation interlocked with blower operation

Process-completion buzzer and visual indication

High- and low-temperature deviation alarms

Sensor-break and equipment-fault alarms

Password-protected access levels

Alarm-history recording

Audit-trail recording

Batch and cycle-status indication

Data Logging and Pen-Drive Interface (Optional)

USB/pen-drive interface

CSV-formatted temperature and process records

Graphical and tabular display of live and stored values

Minimum, maximum and average temperature computation

Automatic periodic downloading of stored records

Access control according to user-authority level

Electronic signing and authorization of user actions

Automatic password-expiry facility

Manual and automatic backup with data archiving

User-configurable report titles, headers and footers

Data-log reports

Alarm-log reports

Historical trend graphs

Audit-trail reports

Report generation in PDF and Excel-compatible formats

Optional Ethernet and RS-485 communication

Optional SMS and email alerts during alarm conditions

Electrical Specifications

Parameter	Offered/Proposed Specification
Electrical supply	415 V AC, three-phase, 50 Hz
Main heater load	Approximately 45 kW
Blower load	Approximately 2.2 kW
Control-system load	Approximately 0.5–1.0 kW
Total connected load	Approximately 48 kW
Main protection	Suitably rated MCCB/MCB
Heater protection	Semiconductor fuses and thyristor protection
Motor protection	Overload relay and short-circuit protection
Phase protection	Phase-failure and phase-sequence protection
Earthing	Proper equipment and control-panel earthing

Safety Features:-

Independent over-temperature protection

PT100 sensor-break alarm

High- and low-temperature deviation alarms

Blower motor overload protection

Heater-to-blower safety interlock

Door-open electrical interlock

Phase-failure and phase-sequence protection

Audible and visual fault alarms

Emergency-stop push button

MCCB/MCB and short-circuit protection

Proper electrical earthing

Principal Specifications

Parameter	Offered/Proposed Specification
Proposed model	HE-HAO-250P
Equipment type	Forced-Air Circulation Programmable Hot AirOven
Application	Preheating and curing of epoxy-resin-cast CTs, PTs, moulds, components and assemblies
Useful chamber size	12" (W) × 12" (D) × 12" (H)
Temperature range	Ambient +10°C to 250°C
Maximum working temperature	250°C
Standard curing cycle	5° Per Hour to 1°C minutes at 250°C
Approximate complete cycle	120 minutes, depending on load and operating conditions
Approximate equipment weight	70 kg, subject to final approved design

Temperature-Control System

Parameter	Offered/Proposed Specification
Primary control	Programmable PID temperature control
Temperature display	Simultaneous Set Value (SV) and Process Value (PV) display
Temperature accuracy	±1°C or better at the controller
Temperature uniformity	±2.5°C or better at stabilized conditions under a properly distributed normal load
Temperature sensors	Class A PT100 RTD – 9 Nos.
Program storage	Minimum 1 programs/ 16 recipes
Cycle programming	Programmable heating, soaking and cooling stages
Timer	Programmable cycle timer
Secondary safety control	Independent over-temperature safety controller/thermostat
Control-panel location	Floor-mounted, wall-mounted or side-mounted, depending on final layout

Heating System

Parameter	Offered/Proposed Specification
Heating-element type	Sheathed tubular Incoloy/Inconel air heaters
Proposed heater capacity	Approximately 5 kW
Heater arrangement	Distributed inside an isolated recirculation duct/plenum
Heater control	Thyristor-based three-phase proportional power controller
Power-controller type	Slim three-phase electronic power controller
Component brands	Autonics, Schneider Electric, L&T or equivalent reputed brands
Heat distribution	Indirect forced-convection heating
Heater safety interlock	Heater operation interlocked with the air-circulation blower

Air-Circulation and Exhaust System

Parameter	Offered/Proposed Specification
Air circulation	High-volume forced-air recirculation
Blower assembly	Heavy-duty motor-driven blower – 1 No.
Proposed blower motor	continuous-duty
Proposed airflow capacity	Approximately Uniform in Whole Chamber
Air distribution	Engineered rear plenums with suitable internal baffles
Fresh-air inlet	Adjustable fresh-air provision
Exhaust system	Adjustable vapour-exhaust outlets with damper arrangement
Exhaust points	One vapour-exhaust points, as per final process design
Cooling performance	Designed to cool to approximately 70°C within 30 minutes after heater shutdown, subject to load, ambient conditions and airflow settings

Construction

Parameter	Offered/Proposed Specification
Construction type	Heavy-duty, multi-wall insulated industrial construction
Inner chamber	SS 304, approximately 2 mm thick
Inner working base	SS 304, 2 mm thick
Outer body	Heavy-duty powder-coated MS/GI sheet
Optional exterior	Complete SS 304 external body for GMP applications
Insulation	Minimum 100 mm high-density ceramic-wool/ceramic-fibre insulation
Insulation properties	Low thermal conductivity, high-temperature stability and resistance to smoke or fumes
Door arrangement	Heavy-duty insulated double-leaf industrial door
Door locking	Positive-locking system with heavy-duty latch
Door gasket	High-temperature silicone gasket
Door safety	Electrical limit switch and safety interlock
Loading arrangement	Heavy-duty removable trolley/tray system
Trolley capacity	Minimum 200 kg uniformly distributed load
Trolley construction	SS 304 or fabricated MS structure, depending on the process
Trolley movement	Heavy-duty wheels/rollers with floor-guide or track arrangement

PLC–HMI Features (Optional)

Main power and control-panel ON/OFF functions

Automatic and manual operating modes

Cycle start, stop, pause and reset controls

Programmable heating, soaking and cooling cycles

Minimum 10-program recipe storage

Real-time Set Value and Process Value display

Real-time temperature trend graph

Independent control and monitoring of the circulation blower

Heater operation interlocked with blower operation

Process-completion buzzer and visual indication

High- and low-temperature deviation alarms

Sensor-break and equipment-fault alarms

Password-protected access levels

Alarm-history recording

Audit-trail recording

Batch and cycle-status indication

Data Logging and Pen-Drive Interface (Optional)

USB/pen-drive interface

CSV-formatted temperature and process records

Graphical and tabular display of live and stored values

Minimum, maximum and average temperature computation

Automatic periodic downloading of stored records

Access control according to user-authority level

Electronic signing and authorization of user actions

Automatic password-expiry facility

Manual and automatic backup with data archiving

User-configurable report titles, headers and footers

Data-log reports

Alarm-log reports

Historical trend graphs

Audit-trail reports

Report generation in PDF and Excel-compatible formats

Optional Ethernet and RS-485 communication

Optional SMS and email alerts during alarm conditions

Electrical Specifications

Parameter	Offered/Proposed Specification
Electrical supply	415 V AC, three-phase, 50 Hz
Main heater load	Approximately 45 kW
Blower load	Approximately 2.2 kW
Control-system load	Approximately 0.5–1.0 kW
Total connected load	Approximately 48 kW
Main protection	Suitably rated MCCB/MCB
Heater protection	Semiconductor fuses and thyristor protection
Motor protection	Overload relay and short-circuit protection
Phase protection	Phase-failure and phase-sequence protection
Earthing	Proper equipment and control-panel earthing