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| Brand | ALPHA (UK) |
|---|---|
| Origin | United Kingdom |
| Model | DS2000 |
| Sensor Technology | Aluminium Oxide Capacitive |
| Measurement Range | -110°C to +20°C dew point |
| Accuracy | ±2°C over full scale |
| Display | Dual-color 7-segment, 5-digit main + 1-digit auxiliary |
| Operating Temperature | -20°C to +50°C |
| Storage Temperature | -50°C to +70°C |
| Humidity Range | 10–90% RH (non-condensing) |
| Output Options | 4–20 mA / 0–10 V linear retransmission |
| Communication | RS-485 Modbus RTU |
| Compliance | Traceable calibration to NPL and ISO/IEC 17025 accredited standards |
| Gas Compatibility | Fully compatible with SF₆, compressed air, nitrogen, argon, hydrogen, and other inert/dry process gases |
| Units Supported | °C dp, °F dp, ppm(v), g/m³, lb/MMSCF |
| Brand | Radcal (USA) |
|---|---|
| Origin | USA |
| Model | Rapid-Gold+ Touch Pro |
| Dimensions | 114 × 92 × 158 mm |
| Weight | 700 g |
| Display | 5″ capacitive TFT LCD (800×480) |
| Battery | 5.5 Ah Li-polymer, >8 h operation |
| Connectivity | USB 2.0 (Micro-B), Wi-Fi 802.11b/g/n (2.4 GHz, WPA2) |
| Storage | 16 GB internal flash (>100,000 exposures) |
| Compliance | IEC 61674, EN 61326-1:2013 (Group 1, Class B), EN 61000-4-x series |
| Operating Temp | 15–35 °C |
| Humidity | ≤80% RH or ≤20 g/m³ |
| Brand | Vaisala |
|---|---|
| Origin | Finland |
| Model | MHT410 |
| Measurement Principle | Cavity Ring-Down Spectroscopy (CRDS) |
| Gas Targets | Dissolved Hydrogen (H₂) and Water Activity (a<sub>w</sub>) in Transformer Oil |
| Oil Compatibility | Mineral oil, natural ester, synthetic ester, silicone oil |
| Enclosure Rating | IP66 with rain shield |
| Warranty | 5 years |
| Output Interfaces | 3× isolated 4–20 mA, RS-485 (Modbus RTU, DNP3, ASCII) |
| Compliance | EN 61326-1, CISPR 32/EN 55032 Class B, ISO 6270-1:2017 (C5-M), ISO 9227:2017 (salt spray), ISO 12994-6 (C5 corrosion protection) |
| H₂ Range | 0–5000 ppm<sub>v</sub> in oil |
| H₂ Accuracy | ±10% of reading or ±15 ppm<sub>v</sub> (whichever is greater) |
| H₂ Stability | ±3% of reading/year |
| H₂ Cross-sensitivity | <2% to CO₂, C₂H₂, C₂H₄, CO |
| a<sub>w</sub> Range | 0–1 (0–100 %RS) |
| a<sub>w</sub> Accuracy | ±0.02 (0–90 %RS), ±0.03 (90–100 %RS) |
| a<sub>w</sub> Response Time (90%) | 10 min at +20 °C in still oil |
| Sensor | HUMICAP® 180L2 |
| Power | 4 W typical, up to 12 W (galvanically isolated input) |
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