SMART WG-2: conductivity and temperature
The SMART WG-2 measures and controls conductivity and temperature. Its ABS housing is designed for wall mounting at the installation.
The conductivity version works with passive conductive 2- or 4-electrode measuring cells. The usable measuring range depends on the cell, its cell constant and the selected instrument settings.
- Passive 2- or 4-electrode measuring cell; adjustable cell constant.
- Pt100 temperature input with 2- or 3-wire connection.
- 2 potential-free relay outputs for control and monitoring.
- 2 assignable analogue outputs: 0–20 mA or 4–20 mA.
- Backlit display with German or English operating menu.
Technical data
| Measuring input |
Conductive 2- or 4-electrode measuring cell |
| Cell constant |
Adjustable from 0.0025 to 50.0000 |
| Measuring range |
Depends on measuring cell, cell constant and range selection; see examples below |
| Conductivity accuracy |
±1.5% or 10 digits as specified in the data sheet |
| Temperature compensation |
Selectable for natural waters (2.2%) or linear compensation (0–6.9%) |
| Temperature measurement |
−20.0 to +110.0 °C; accuracy ±0.5 °C |
| Temperature sensor |
Pt100, 2- or 3-wire; cable break and short-circuit monitoring |
| Relay outputs |
2 potential-free contacts; 250 V AC / 8 A with resistive load |
| Analogue outputs |
2 × 0–20 mA or 4–20 mA; maximum load 500 Ω |
| Galvanic isolation |
Measuring inputs isolated from the instrument |
| Supply voltage for this article |
85–264 V AC, 50/60 Hz |
| Power consumption |
< 5 VA |
| Ambient conditions |
0–50 °C; relative humidity < 75%, non-condensing |
| Housing |
ABS wall housing, 120 × 122 × 60 mm |
| Connections |
Plug-in screw terminals |
| Protection |
IP65 at the front |
Select a range that matches the measuring cell
Examples of selectable full-scale values from the operating manual. Cell selection must also take account of the medium, temperature and measuring cell version.
| LM/LMP-001 |
9.999 / 99.99 / 999.9 µS/cm |
| LM/LMP-01 |
99.99 / 999.9 / 9999 µS/cm |
| LM/LMP-1 |
999.9 µS/cm / 9999 µS/cm / 99.99 mS/cm |
| LM/LMP-1, extended range |
9999 µS/cm / 99.99 mS/cm / 210 mS/cm |
| LM/LMP-5 |
999.9 mS/cm |
Control and signal outputs
Relay functions include limit switching, pulse duration control (PRI), pulse frequency control (PRF) and alarm functions. Integral action can be enabled for PRI and PRF. The two current outputs can be assigned to the measured value or temperature and scaled as required.
| Limit function |
Permanent or momentary contact; switching delay 0–9999 s |
| Switching hysteresis |
0–800 digits |
| Alarm delay |
0.1–30 min; manual reset |
| PRI cycle time |
4–120 s; selectable integral action |
| PRF pulse duration |
170 ms fixed; selectable integral action |
Version and related instruments
This page describes article 1300.2201 with an 85–264 V AC supply. Please contact us for a DC version or assistance with sensor selection.
Manuals and contact
The manual covers SMART 96-2 and SMART WG-2. Refer to the sections for the relevant housing version.
