The Yamato DNF-401 is the 90 L, 115V-nominal member of the DNF energy-saving convection-oven family (brochure model DNF400), a wind-velocity-adjustable forced-circulation oven rated to 260 °C with a 10-step blower, an exhaust damper, microcomputer PID control, and 32-step program operation. Because the fan speed is adjustable across 10 steps, the DNF can run from strong forced circulation down toward gentle low-turbulence flow, the "forced / natural convection" flexibility in its catalog name. It is the entry-capacity 100V unit in a family that scales to 540 L.
Key Specifications
| SKU | DNF-401 |
| Brochure model | DNF400 (90 L, 100V) |
| Type | Wind-velocity-adjustable, forced-circulation oven (with exhaust damper) |
| Temperature control range | Room temp. +5 °C to 260 °C |
| Temperature adjustment accuracy | ±0.5 °C (at 260 °C) |
| Temperature distribution accuracy | ±2.5 °C (at 260 °C) |
| Time to reach max. temp. | Approx. 75 min |
| Capacity | 90 L |
| Internal dimensions (W×D×H) | 450 × 450 × 450 mm |
| External dimensions (W×D×H) | 580 × 646 × 860 mm |
| Heater | Stainless pipe heater, 1.25 kW |
| Blower | Sirocco fan / DC brushless motor, 10 W, 10-step wind-velocity control |
| Power supply | 100V AC, 13.5A, 50/60 Hz (US nominal 115V) |
| Weight | Approx. 61 kg |
| Shelves | 2 stainless punching-metal shelves (15 kg/shelf); 11 shelf-bracket steps at 30 mm |
| Controller | PID by microcomputer (VI CR3 type), K-thermocouple |
Application Profile
The 90 L DNF-401's higher 260 °C ceiling and adjustable airflow suit a broad range of dry-heat processing, including moisture and gravimetric dry-to-constant-weight determinations at adjustable uniformity. Typical uses:
- General and high-temperature drying. Samples and materials requiring up to 260 °C.
- Curing and heat conditioning. Coatings, adhesives, and components on defined ramp/soak profiles.
- Airflow-sensitive drying. Light or powdered samples where the 10-step fan can be dialed down to avoid disturbance.
- Multi-stage method development. Up to 32 program steps with auto-start / auto-stop scheduling.
The 10-step wind-velocity control plus front exhaust damper let the operator trade airflow uniformity against sample disturbance and moisture venting, a key selection advantage over fixed-fan ovens. (See gravity-vs-forced-convection-oven.)
Design Architecture
The DNF-401 uses wind-velocity-adjustable forced circulation via a sirocco fan on a DC brushless motor (10 W, 10 steps) with a 1.25 kW stainless pipe heater, governed by a microcomputer PID controller (VI CR3 type) reading a K-thermocouple. A sliding-knob exhaust damper on the front controls venting. The SUS304 stainless interior and glass-wool insulation support uniform heating to 260 °C. Operation modes include fixed temperature, auto-start, auto-stop, and 32-step program operation, plus timer, clock, total-operating-hours counter, fan control, and calibration offset. A 50 mm exhaust opening is on the back surface; cable and intake ports (30 mm) are on the right surface.
Safety includes an earth-leakage breaker, an independent overheating-prevention device, a key-lock function, and self-diagnostics for sensor error, heater disconnection, triac short circuit, and automatic overheating prevention. This model is specified for 100V AC single-phase, 13.5 A service (US nominal 115 V).
Frequently Asked Questions
What temperature range does the DNF-401 reach? Room temperature +5 °C up to 260 °C, with ±0.5 °C adjustment accuracy and ±2.5 °C temperature distribution at 260 °C.
Is the DNF-401 forced or natural convection? It uses wind-velocity-adjustable forced circulation (a 10-step sirocco fan plus a front exhaust damper) so airflow can run from strong forced circulation down toward gentle low-turbulence flow.
How large is the chamber? 90 L, with internal dimensions of 450 × 450 × 450 mm; it ships with 2 stainless punching-metal shelves rated 15 kg each.
How many program steps does it support? Up to 32 program steps, plus fixed-temperature, auto-start, and auto-stop operation under microcomputer PID control.
What voltage does it require? 100V AC, 13.5 A, 50/60 Hz (US nominal 115 V). The 220V sister model is the DNF-411.
Ordering & Configuration
Standard delivery includes the oven, 2 stainless punching-metal shelves (15 kg/shelf), 4 shelf brackets, and the instruction manual. Optional stand (ON62), stacking fittings, extra shelves, and door options are available.
At quote, confirm the voltage and plug (the 115V-nominal variant maps to the brochure's 100V AC / 13.5 A rating; the 220V sister is the DNF-411); the target temperature and program profile (≤ 260 °C, ramp/soak steps, and airflow fan-step preference); any additional shelving, stand, or stacking fittings; and bench clearance and back-surface exhaust routing for the 580 × 646 × 860 mm external footprint. Lead time and warranty follow Yamato standard capital-equipment terms.
Request a quote to configure the DNF-401 for your drying and conditioning workflow.
DNF wind-velocity-adjustable oven family (capacity ladder): DNF400/410 (90 L, this unit) → DNF600/610 (150 L) → DNF810 (300 L) → DNF910 (540 L). The 90 L and 150 L sizes offer 100V (400/600) and 200V (410/610) variants; all reach 260 °C.
