The Yamato FO-711CR is a 23.6 L muffle furnace reaching 1150 °C with ±2 °C control accuracy at top temperature, on a low-mass ceramic-fiber chamber with a factory-fitted communication port for RS485/RS232C data output. Its 270 × 350 × 250 mm chamber is sized for large-batch ashing and sizeable heat-treatment loads on a 220 V single-phase supply. This SKU is offered on 220 V (documented base model FO710).
Key Specifications
| Model / capacity | Yamato FO710 (FO-711CR, comm-port gen) — approx. 23.6 L |
| Operating temperature range | 100 to 1150 °C |
| Adjustment accuracy | ±2 °C (at 1150 °C) |
| Time to reach temperature | Approx. 80 min to 1150 °C (approx. 55 min to 850 °C) |
| Control system | PID control by VS4 controller |
| Sensor | R thermocouple (W sensor) |
| Setting / display | Digital setting; digital display |
| Operation functions | Fixed temperature; timer (auto-stop, auto-start); program (max. 6 patterns — 30 steps×1 / 15×2 / 10×3) |
| Communication | Communication port (RS485/RS232C) — CR generation |
| Additional functions | Lock function; auto recovery after power failure; calibration offset |
| Heater | Iron-chrome wire (Kanthal AF), 3.0 kW |
| Furnace unit | Ceramic fiber |
| Cooling fan | Axial fan motor |
| Safety devices | Earth-leakage/circuit breaker, thermal fuse, overheating-prevention device, self-diagnostics |
| Ambient temperature range | 5 to 35 °C |
| Internal dimensions | 270 × 350 × 250 mm (W×D×H) |
| External dimensions | 506 × 605 × 726 mm (W×D×H) |
| Weight | Approx. 58 kg |
| Power supply | 220V AC single phase, 50/60 Hz (base FO710: 200V, 18.5 A) |
Application Profile
A muffle furnace isolates the sample from the heating elements behind a refractory "muffle," so combustion products and radiant elements never contact the charge — the reason it is the standard tool for gravimetric ashing, loss-on-ignition, sample incineration, and heat treatment. Reaching 1150 °C, the FO-711CR covers ASTM/AOAC ash determinations, coal and food ashing, and residue-on-ignition work, where a clean, repeatable burn-off makes the mass measurement valid. At 23.6 L (270 × 350 × 250 mm), it serves production-adjacent labs ashing large sample batches or heat-treating bigger parts.
The ceramic-fiber chamber heats and cools quickly and draws less power than a firebrick furnace; the large FO models reach 1150 °C in about 80 minutes. Control is PID via the VS4 controller with an R thermocouple, holding ±2 °C at 1150 °C; a 6-pattern program (up to 30 steps) scripts staged ramp-soak-cool profiles for reproducible ashing or annealing. For clean gravimetry, allow full burn-off before weighing and — where volatile or corrosive off-gassing is expected — add the optional exhaust system unit.
Frequently Asked Questions
What maximum temperature does the FO-711CR reach? It operates from 100 to 1150 °C, with ±2 °C adjustment accuracy at 1150 °C.
How big is the chamber? The internal volume is 23.6 L (270 × 350 × 250 mm), sized for large-batch ashing.
What is the electrical supply? It is a 220 V AC single-phase unit drawing 18.5 A (documented base model FO710).
How long does it take to heat up? Approximately 80 minutes to reach 1150 °C (about 55 minutes to 850 °C).
Can it run automated ramp-and-soak profiles? Yes — the VS4 controller supports fixed-temperature, timer, and program operation with up to 6 patterns, plus auto-recovery after a power failure, and the CR communication port outputs data over RS485/RS232C.
Ordering & Configuration
Add to quote or cart for a formal quotation. At quote we confirm the 220 V supply, exhaust/off-gas handling, any output-terminal or sample-tray options, and lead time.
At ~58 kg and 506 × 605 × 726 mm, site it on a stable, noncombustible bench or stand with clearance and ventilation for the hot exterior and exhaust. Warranty: per Yamato standard capital-equipment terms — confirmed at quote.
Yamato FO muffle furnace, 23.6 L (comm-port generation):
- FO-711CR (this product) — 23.6 L, 220V single phase
- Step down to FO-611CR (17.5 L), or up to FO-811CR (30 L) for the largest charge.
