This manual introduces the features and characteristics of the Vaisala HUMICAP® Humidity Transmitter Series HMP140A U175EN15 and provides detailed instructions on installation, calibration, and maintenance.
The HMP140A series includes three transmitter types (HMP141A, HMP142A, HMP143A) for wall, duct, or tight‑space installations. All units measure relative humidity from 0 %RH to 100 %RH and temperature from –40 °C to +60 °C, with four analogue output options and IP65 protection, making them suitable for indoor and outdoor environments.
The guide covers proper site selection, mounting procedures (e.g., sensor head down for HMP141A), electrical connections, calibration methods (one‑point and two‑point humidity calibration), and routine maintenance such as sensor and filter replacement. Technical data, spare parts, and appendices are also provided.
| Relative humidity range | 0–100 %RH |
|---|---|
| Temperature range | -40 to +60 °C |
| Analogue outputs | 0–20 mA (4–20 mA), 0–1 V, 0–5 V, 0–10 V |
| Ingress protection | IP65 |
| Humidity sensor | HUMICAP® 180 |
| Temperature sensor | Pt1000 |
The HMP140A measures relative humidity from 0 %RH to 100 %RH.
It operates from –40 °C up to +60 °C.
The HMP141A should be mounted with the sensor head pointing downwards; upward mounting should be avoided.