SMART WG-2: pH or ORP and temperature
The SMART WG-2 measures and controls pH or ORP and temperature. Its ABS housing is designed for wall mounting at the installation.
The measuring input is configured for either pH or ORP measurement. A Pt100 input measures temperature and enables automatic temperature compensation for pH measurement.
- pH measurement from 0.00 to 14.00 pH or ORP measurement from −1200 to +1200 mV.
- 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
| pH range |
0.00–14.00 pH |
| ORP range |
−1200 to +1200 mV |
| Accuracy |
±0.02 pH / ±2 mV |
| Input impedance |
> 10¹² Ω |
| Monitoring |
Electrode and cable monitoring for short circuit, interruption and glass breakage |
| 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 |
Calibration and measurement
pH calibration uses two buffer solutions with automatic buffer recognition. The instrument displays zero point and slope. For ORP calibration, the reference solution value is entered.
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 |
0–200 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 1300.2301 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.
