IS-Max™ flow meter (for Class I Division 1)
Mass flow measurement where explosive gases are continuously present
Flow meters for Class I Division 1 environments provide precise gas measurement where explosive gases are continuously present. IS-Max is an intrinsically safe device certified for Zone 0 with ATEX, IECEx and North American DEKRA approvals, ensuring compliance in hazardous areas.
Using laminar differential pressure technology, IS-Max delivers accurate mass and volumetric flow measurement with multivariable reporting, including temperature and pressure data.
Key features:
| Certification | Marking | Certificate |
|---|---|---|
| ATEX | II 1G Ex ia IIC T4 Ga Tamb -20 °C to +70 °C | DEKRA 22ATEX0075X |
| IECEx | Ex ia IIC T4 Ga Tamb -20 °C to +70 °C | IECEx DEK 22.0078X |
| North America | Class I, Division 1, Groups A-D T4, Ex ia Class I, Zone 0, AEx ia IIC T4 Ga Tamb -20 °C to +70 °C | DEKRA 23CAUS40-127215 |
| Parameter | |
|---|---|
| Mass flow accuracy | Standard accuracy: ± 0.8% of reading and ± 0.2% of full scale High accuracy: ± 0.4% of reading and ± 0.2% of full scale (5 SCCM – 500 SLPM only) |
| Flow repeatability (2σ) | ± 0.2% of full scale |
| Pressure accuracy | ± 0.5% of full scale |
| Flow measurement range | 0.1–100% (1,000:1 turndown) |
| Operating pressure | 11.5–160 PSIA |
| Pressure sensitivity | Mass flow zero and span shift: ± (0.08% of reading + 0.02% of full scale) per atm from tare pressure |
| Temperature sensitivity | Mass flow zero and span shift: 0.02% of full scale per °C from 25 °C |
| Temperature accuracy | ± 0.75 °C |
| Relative humidity accuracy | ± 1.8% RH at +23 °C (0% RH … 90% RH) |
| Relative humidity temperature sensitivity | 0.05% RH/°C (0 °C … +60 °C) |
| Operating temperature range | -20…70 °C (ambient and gas) |
| Total volumetric uncertainty | ± 0.1% of reading (additional uncertainty) |
| Sensor response time | < 1 ms |
| Typical indicator response time | Depends on flow rate and is user adjustable; as fast as (T63): 0.5–5 SCCM: 100–4000 ms 10 SCCM – 20 SLPM: < 10 ms 50–5000 SLPM: 65–255 ms |
For detailed information on all flow meter models, contact our laboratory installation consultants.
Datasheets (Alicat):
