AHP-SERIES

Supported Applications

The Omega AHP Series consists of "T" type in-line air process heaters designed to heat clean, dry air or gas. Documented applications include baking, drying, laminating, metal working, packaging, plastic welding, preheating, sealing, soldering, shrink fitting, and synthetic fabric sewing.

Outlet temperatures are varied by adjusting the voltage and/or the air flow. Closed loop control can be achieved with temperature controllers and "T" fittings to mount thermocouples for monitoring outlet conditions.

Operating Conditions & Performance

The AHP Series is rated for exit air or gas temperatures up to 540°C (1000°F) with inlet air or gas temperatures up to 121°C (250°F). The pressure rating is 80 psig. Wattage tolerance is +5, -10% or better at the voltage specified.

Heaters are designed for horizontal mounting and require proper airflow; controls should be used to prevent operation without air flow. Incoming air must be filtered prior to passing through the heater and free of moisture, condensation, or other contaminants. The cold air entry should always be at the termination end of the heater.

Model Specifications

• AHP-374 Series: 10 mm (⅛") diameter; heated length 89 mm (3½"); available in 200 W at 120 Vac or dual-voltage configurations.
• AHP-505 Series: 13 mm (½") diameter; heated length 114 mm (4½"); available up to 400 W depending on voltage selection.
• AHP-756 Series: 19 mm (¾") diameter; heated length 140 mm (5½"); available up to 750 W at 240 Vac or lower wattage at 120 Vac.

Dual-voltage models (AHP-3742, AHP-5052, AHP-7562) can be operated on either 120 V or 240 V. The watts per inch of heated length varies by model and voltage; custom made heaters are available to change this parameter.

Flow Requirements

Minimum CFM required depends on the diameter and wattage density:

• ⅛" Diameter: Minimum 60 CFM for lower power densities, up to 200 CFM at higher loads.
• ½" Diameter: Ranges from 80 CFM minimum to 250 CFM maximum depending on wattage per inch.
• ¾" Diameter: Supports flow rates up to 500 CFM for high-power configurations.

Configuration Options

The series offers configurable options regarding process connections, electrical leads, and mounting accessories. Heaters are available with or without NPT fittings; adding the suffix "-NF" to the model number orders heaters without fittings (additional cost applies).

Construction & Materials

• Sheath: Stainless steel.
• Internal Components: Ceramic coil support, resistance element, silver solder, epoxy seal, copper tee, and Heliarc weld.
• Bushings: Optional brass bushing or optional stainless steel bushing available.

Electrical & Connections

• Voltage Options: 120 Vac models and dual-voltage (120/240 Vac) models.
• Leads: Fiberglass insulated leads, typically 0.3 m L (1').
• NPT Fittings: Standard configurations include ¼", ⅜", or ¾" NPT fittings depending on the series diameter.

Key Product Differences

The AHP Series is differentiated by three primary diameters (AHP-374, AHP-505, and AHP-756) which dictate overall length, heated length, weight, and maximum CFM capacity. Within each diameter series, variants differ by voltage configuration:

• 120 Vac Models (e.g., -3741): Fixed 120 V operation with specific wattage ratings.
• Dual-Voltage Models (e.g., -3742): Operate on either 120 V or 240 V, providing different power outputs at each voltage level. For example, the AHP-3742 delivers 50 W at 120 V and 200 W at 240 V.

Accessories include a Thermocouple T-Fitting (AHP-NPT34) for use with subminiature thermocouple probes and stainless steel compression fittings to monitor temperature at the outlet of AHP-756 Series heaters. Dimensions vary by series, ranging from 101.6 mm (4 in) overall length for the AHP-374 to 152.4 mm (6 in) for the AHP-756.