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| Brand | YiHeng (Shanghai Yi Heng) |
|---|---|
| Origin | Shanghai, China |
| Model | BPHJS Series |
| Temperature Range | −60 °C to +130 °C |
| Humidity Range | 30–95 %RH |
| Temperature Uniformity | ±2 °C |
| Temperature Fluctuation | ±0.5 °C |
| Humidity Fluctuation | ±3 %RH |
| Refrigerant | R134a (ozone-friendly) |
| Inner Chamber Material | AISI 304 mirror-finish stainless steel |
| Control System | Color TFT touchscreen with programmable logic (120 programs × 99 segments, up to 999 cycles) |
| Communication Interface | RS-232/RS-485, USB data export (SD card), optional 485 printer interface |
| Safety Protections | Independent over-temperature cutoff, compressor overheat/overcurrent/overload protection, fan overheat protection, low-water alarm |
| Power Supply | AC 380 V, 50 Hz (models with −40 °C or −60 °C capability) |
| Brand | MEMMERT |
|---|---|
| Origin | Germany |
| Model | TTC256 |
| Internal Volume | 256 L |
| Temperature Range | −42 °C to +190 °C |
| Heating Rate (IEC 60068-3-5) | 10 K/min (avg.) |
| Cooling Rate (IEC 60068-3-5) | 6 K/min (avg.) |
| Temp. Uniformity (setpoint-dependent) | ±0.5 K to ±2 K |
| Temp. Stability (setpoint-dependent) | ±0.2 K to ±0.5 K |
| Humidity Range (optional) | 10–98 % RH |
| Humidity Sensor | Capacitive, digital display with auto-diagnosis |
| Humidity Control | Integrated steam humidification & refrigeration-based dehumidification |
| Water Supply | Dual 10 L distilled water tanks with auto-switching |
| Dimensions (W×H×D, mm) | 898 × 1730 × 1100 (external) |
| Construction | Stainless steel interior |
| Accessories | Lockable castors, 80 mm right-side access port with plug, Pt100 Class A 4-wire temperature sensor, dual-stage overtemperature protection (electronic + mechanical), audible/visual alarms for door open, temp. deviation, empty water tank, and sensor fault |
| Brand | Yi Heng (Shanghai Yi Heng) |
|---|---|
| Origin | Shanghai, China |
| Model | BPH Series / BPHJ Series |
| Temperature Range | −20 °C to 130 °C (A), −40 °C to 130 °C (B), −60 °C to 130 °C (C) |
| Temperature Uniformity | ±2 °C |
| Temperature Fluctuation | ±0.5 °C |
| Refrigerant | R134a (non-ozone-depleting) |
| Internal Chamber Material | AISI 304 mirror-finish stainless steel |
| Control System | Microprocessor-based digital controller (BPH) or 7-inch color TFT touchscreen with programmable logic (BPHJ) |
| Programmability | Up to 120 programs × 99 segments × 999 cycles |
| Communication Interface | RS-232 / RS-485 standard |
| Safety Protections | Independent over-temperature cut-off, compressor overheat/overcurrent/overload protection, fan overheat protection, dual-stage temperature deviation alarms |
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