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Pressure Transducers
QPress – QLS-ATEX 4400 Series
The QLS-ATEX 4400 Series is a wide-range process pressure transmitter spanning compound vacuum to 600 bar at ±0.5 % FS. It offers analogue, RS485 Modbus RTU and HART outputs, so one model serves both analogue loops and digital networks, and the IP68 housing handles wet, buried and washdown installations. A broad choice of G-thread, NPT and M20 process connections suits oil, gas and chemical-process duty. Choose the 4400 when you need digital outputs or an IP68 housing for wet and buried installations; the QLS-ATEX 3400 is the higher-precision analogue pick.
Measurement range
−1…600 bar
Accuracy
±0.5 % FS
Output / communications
4–20 mA, HART and Modbus RTU / RS485
Process connection
BSP / NPT / Metric threaded options
Process temperature
−40 to 80 °C
Approvals / Protection
ATEX, IP68
Technical Specifications
| Pressure type | Gauge; Absolute; Vacuum |
|---|---|
| Response time | ≤ 10 ms |
| Max. working pressure | Overload 200 %FS; Burst 500 %FS |
| Process / ambient temperature | Working −40…+80 °C (non‑corrosive); −20…+80 °C (corrosive); up to +250 °C (custom); Compensation 0…+50 °C; Storage −40…+125 °C (NBR seal); −30…+150 °C (FKM seal) |
| Power supply | 5…30 V DC (per output variant) |
| Outputs | 4–20 mA; 4–20 mA + HART; 0–5 V; 0.5–5 V; 0–10 V; 0.5–4.5 V; RS485 (MODBUS RTU) |
| Environmental rating | IP68 |
| Electrical connection | Cable outlet; Hirschmann connector |
| Housing material | Stainless steel (SUS316L welded body) |
| Other ratings / standards | Intrinsic safety Ex ia IIC T6 Ga; Insulation ≥ 100 MΩ, 100 V DC; Endurance > 100 million cycles |
Key Features
- Spans compound vacuum to 600 bar with analogue, RS485 Modbus and HART output options.
- IP68 housing suits wet, buried and washdown installations in oil, gas and chemical plant.
- Choice of G1/4, G1/2, NPT and M20x1.5 threads for flexible process fitting.
- Stainless steel 316L wetted parts for broad media compatibility.
- ±0.5% FS accuracy for dependable measurement.
Typical Applications
- Oil & Gas
- Pipelines & Refineries
- Natural-Gas Compressors
- Marine
- Diesel Tank Level