User manual for the Alpha SADPminiEx automatic dewpoint hygrometer covering installation, operation, safety and specifications.
The Alpha SADPminiEx is a battery‑powered portable automatic dewpoint hygrometer with a backlit LCD, tactile membrane keypad, RS485 and optional 4‑20 mA output. It is intrinsically safe for use in hazardous areas and includes features such as automatic calibration, single‑point calibration, real‑time clock and security access.
The manual provides general information, safety guidelines, installation of the air/gas sampling system, operation procedures, logging functions, communication interfaces and detailed technical specifications. Appendices contain menu maps, troubleshooting steps and a full specification table.
| Dewpoint Range | -110 °C to –20 °C (various sensor options) |
|---|---|
| Accuracy | ± 2 °C DP over full range |
| Resolution | 12‑bit |
| Output | 4‑20 mA loop powered, < ± 0.25 % full‑range error |
| Display Type | Blue 128 × 64 dot LCD with LED backlight |
| Keyboard | 5‑key metal‑dome tactile membrane |
| Sensor Operating Principle | Ultra High Capacitance Al₂O₃ sensor |
| Operating Temperature | -10 °C to +50 °C |
| Storage Temperature | -20 °C to +60 °C |
| Power Supply | 100‑240 VAC, 50‑60 Hz, 400 mA; 6 VDC, 15 W output |
| Physical Weight | 1.1 kg (2.4 lb) |
| Dimensions (W × H × D) | 97 × 112 × 202 mm (3.82 × 4.41 × 7.95 in) |
The battery provides more than 70 hours of continuous use when fully charged.