The 691 pressure transmitter features calibrated and amplified sensor signals which are available as standardized voltage or current out- puts. Various application-specific pressure and electri- cal connections can be provided.
The Huba 691 pressure transmitter is designed for fine pressure and flow measurement, offering both relative (-1 to 600 bar) and absolute (0 to 16 bar) ranges. It features a ceramic element, modular connections, and high resistance to temperature and mechanical aging.
The manual covers technical specifications, connection options (inside G 1/4, outside G 1/2, DIN connectors), power supplies (18‑33 VDC or 24 VAC ± 15 %), signal outputs (0‑10 V, 4‑20 mA), and EMC compliance. Installation arrangements, sealing materials, and calibration options are also described.
| Relative pressure range | -1 to 600 bar |
|---|---|
| Absolute pressure range | 0 to 16 bar |
| Overload rating | 2 × full scale |
| Rupture pressure | 3 × full scale |
| Zero‑point residual voltage | < 50 mV |
| Operating temperature (ambient) | -15 °C to 480 °C |
| Power supply (DC) | 18‑33 VDC |
| Power supply (AC) | 24 VAC ± 15 % |
| Signal output (voltage) | 0‑10 V |
| Inside thread size | G 1/4 |
| Weight (G 1/4 version) | 200 g |
It measures relative pressure from –1 to 600 bar and absolute pressure from 0 to 16 bar.
The device can be powered from 18‑33 VDC or from 24 VAC ± 15 % using either 3‑wire or 2‑wire cables.