Key facts
- Brand
- Vaisala
- Model
- HMP45A
- Category
- Other
- Industry
- Industrial
- Documents
- 2
- Languages
- JA · ZH
- Last added
- 2012-04-06
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Vaisala HMP45A/D Probe Operating Manual
This manual provides detailed operating instructions for the Vaisala HMP45A and HMP45D probes, which measure relative humidity and temperature. It covers probe construction, sensor types, and the differences between the active voltage output of the HMP45A and the passive Pt100 output of the HMP45D.\n\nThe document includes wiring diagrams, calibration procedures, spare‑part lists, technical specifications, and warranty information. Users are guided on proper installation, maintenance, and field calibration using Vaisala equipment. This manual is written in Japanese.
Read onlineVaisala HMP45A specifications
| Humidity measurement range | 0.8 – 100 %RH |
|---|---|
| Humidity accuracy (20 °C) | ±1 %RH (0‑90 %RH), ±2 %RH (90‑100 %RH) |
| Temperature measurement range | -39.2 … +60 °C |
| Temperature accuracy (20 °C) | ±0.2 °C |
| Supply voltage | 7 – 33 VDC |
| Power consumption | <4 mA |
| Output load impedance | >10 kΩ (to ground) |
| Weight (incl. packaging) | 330 g |
| Housing material | ABS plastic |
| IP rating | IP66 (dust‑tight, water‑proof) |
All Vaisala HMP45A documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
How does the temperature output differ between HMP45A and HMP45D?
HMP45A provides an active voltage output (0‑1 V) while HMP45D provides a passive Pt100 resistance output.
What calibration methods are supported by the sensor?
The sensor can be calibrated on site using single‑point or two‑point calibration.
Can the sensor be used in high humidity environments?
Yes, the sensor maintains high accuracy in high‑humidity conditions.