- Ex-protection version of the iPR-B3
- Suitable for all applications in explosion-proof areas
- Certified according to European Classification ATEX II 1 G Ex ia IIC T4 Ga
- Permanent inline real-time measurement of the concentration of dissolved solids
Automatic process refractometer iPR – EX
Fully automatic process refractometer for direct measurement of dissolved solids, process monitoring and control. Principle of the critical-angle refractometer with sapphire prism and high-resolution photodiode array; no influence of color and opacity of the medium on the measuring result. Measuring head made of stainless steel, chemical resistant, food safe, hygienic, for process temperatures up to 120 °C (with connected water cooling) and pressures up to 1 MPa.
The explosion protection version of the process refractometer consists of an intrinsically safe, single-certified sensor, which is installed in the hazardous area. The measuring signals are routed to the non-explosive area via a special cable (maximum length 500 m) and connected to 4 zener barriers. The connection to the central control system is realized with a RTU Modbus or serial RS 485 interface.
Alternatively, Schmidt + Haensch offers a control unit, which is also installed outside the hazardous area. The 7 “touch screen is individually configurable. The measured data can be output via Ethernet as a 24 V or 4-20 mA signal or control a relay.
For data transmission to other systems, serial RS 232, 485 interfaces, a CAN bus or UPC server are available.
Up to two measuring heads can be connected at the same time.
Main specifications
| Standards | ATEX II 1 G Ex ia IIC T4 Ga IEC in preparation |
| Measuring range | 1,32000 – 1,52000 nD |
| Resolution | 0,00001 nD |
| Precision | ±0,00014 nD |
Temperature
| Ambient temperature | -20 °C to +65 °C |
| Process Temperature | -20°C to +120 °C* |
| Temperature resolution/precision | 0.01°C / ±0.2°C (0° to 70°C) |
| Process pressure | 0 to 1 MPa (145 psi, 10 bar) |
Additional informationen
| Prism | Sapphire |
| Wetted parts | Sapphire (prism), stainless steel, FKM |
| Protection class | IP 67 |
| Light source / wavelength | LED, 589 nm |
| Interface, switches | ModBus, RS485 and 24V with external Zener barriers |
| Dimensions | 330mm x 149mm (length x diameter) |
| Weight | 9600g |
Control unit
| Operation | 1 and 2 measuring headsets are available, connectable with built-in Zener barriers |
| Display | 7″ Touchscreen, 800×480 pixel |
| Interface | Ethernet |
| DIN rail parts (expandable) | Switch inputs (24 V) and outputs (24 V / relay / 4-20mA) / Communication (RS232 / RS485), CAN, UPC Server |
| Highlights | Configuration of measuring head and outputs / Adjust switching thresholds and analog outputs / Concentration and other scales user programmable |
| Power | 85V … 265V 50/60Hz |
| Housing | IP65 |
* with cooling by cooler circuit only, electronic max. +65°C