Pressure Transmitter
981
Compact relative transmitter for liquids & gases: Analogue transmitter for overpressure, vacuum or differential pressure with selectable 0–10 V (3‑wire) or 4–20 mA (2‑wire) output. Typical measuring ranges span ±50 mbar to 0…600 mbar, making the 981 a versatile low‑pressure workhorse for process and utility applications.
982R
Room/HVAC differential transmitter, set‑and‑go: Designed for air and other non‑combustible, non‑aggressive gases, 982R provides a single adjustable range with a clever one‑button 50% range reduction for rapid on‑site tuning; variants cover 0…100 Pa up to 0…10 kPa with generous overload reserves.
984
Multi‑range flexibility in one device: The 984 series measures differential, overpressure and vacuum and offers up to eight switchable ranges plus two output signals (selectable via jumper or rotary switch). Models 984M/984A/984Q let you switch between ranges and outputs for fast commissioning across HVAC controls, VAV loops and filter monitoring.
Performance options including Modbus: Like 984, the 985 family covers differential, overpressure and vacuum with multiple ranges (down to –100 Pa and up to 1 bar, depending on type). Choose 985M for 2‑wire 4–20 mA simplicity, or go digital with 985‑Modbus to parameterize and read data via Modbus RTU.
Differential pressure transmitter for liquids: Purpose‑built for liquid circuits, 988 simplifies installation. Select 0–10 V or 4–20 mA (2‑wire/3‑wire) and ranges like 0…2 bar / 0…6 bar / 0…10 bar to match pumps, compressors and cooling loops.
990
Differential pressure transmitter with integrated display: For air and non‑aggressive gases, 990 offers menu‑selectable outputs (0–10 V or 4–20 mA), manual (990M) or automatic (990A) zero, unit switching (Pa/mbar/inWC) and square‑root extraction for volume‑flow tasks; ranges span 0 Pa up to 2,500 mbar (type‑dependent).
