Product details
Self-Cleaning Suspended Solids & Turbidity Probe — Wiper Equipped
The InstroDirect IDTB-SS-W Suspended Solids / Turbidity Probe with Self-Cleaning Wiper is a heavy-duty suspended solids and turbidity probe designed for activated sludge and process water where a non-wiping optical sensor would foul within hours. A mechanical wiper sweeps the optical window on a user-configurable cycle (typically every 15 minutes), so the probe delivers drift-free readings in MLSS up to 30 g/L without daily manual cleaning.
Technical Specifications
| Parameter | Specification |
|---|---|
| Measurement methods | Dual: ISO 7027 (turbidity) + 90° scattered infrared (suspended solids) |
| Turbidity range | 0 – 4000 NTU |
| Suspended solids range | 0 – 30 g/L (0 – 30,000 mg/L) |
| Accuracy | ±5% of reading (SS) / ±2% of reading (turbidity) |
| Resolution | 0.1 mg/L (SS low range), 0.01 NTU (turbidity) |
| Wiper cycle | User-configurable 1 min – 24 hr; typical 15 min |
| Temperature range | 0 – 50 °C |
| Operating pressure | ≤ 4 bar |
| Output signal | RS485 Modbus RTU |
| Power supply | 12 – 24 VDC, < 2 W (during wipe) |
| Body material | 316 stainless steel, sapphire optical windows, POM wiper arm |
| Process connection | 3/4″ NPT threaded or cable-suspended |
| Ingress protection | IP68 |
| Cable | 10 m shielded 4-core (20 m / 50 m on request) |
| Warranty | 12 months, Australian-backed |
Typical Australian Applications
- Activated sludge MLSS monitoring in aeration basins
- Secondary clarifier sludge blanket measurement
- Digester feed solids control
- Industrial wastewater suspended solids compliance
- Pulp and paper process water
- Mining tailings and slurry monitoring
- Food & beverage effluent screening
Why Integrators Choose the IDTB-SS-W
- Mechanical wiper eliminates the weekly manual cleaning cycle that every non-wiping probe demands in activated sludge
- Dual-range firmware outputs both turbidity (NTU) and suspended solids (mg/L) on separate Modbus registers
- 30 g/L upper range covers even the heaviest MLSS in digester feeds
- 316 stainless body and sapphire windows survive WWTP chemistries long-term
- Replacement wiper blades and optical window kits stocked locally in Brisbane
Installation & Calibration
Submerge in the aeration basin or install through a 3/4″ NPT pipe boss in a process line. Configure the wiper interval based on fouling observations (start at 15 minutes and adjust). Calibrate both turbidity and SS channels on-site against a grab-sample laboratory TSS analysis. Replacement wiper blades are a 60-second swap without removing the probe from service.
Frequently Asked Questions
How often do I need to replace the wiper blade?
Typically every 6–12 months depending on duty cycle and water abrasiveness. Blade swap is a 60-second on-site procedure.
Can this replace a laboratory TSS analysis?
For process control and trending, yes. For regulatory compliance reporting, calibrate the probe against lab TSS regularly (monthly) and treat the probe as a continuous monitoring instrument backed by lab verification.
Is there a lower-cost version without the wiper?
Yes — see IDTB-IL-316 (Inline Optical Turbidity Sensor) for clean-water applications without fouling.
Will it work in primary sedimentation tanks?
Yes, but at the upper end of the range (10–30 g/L). Position the probe at a stable depth in the sludge layer and configure the wiper to 5-minute intervals during high-flow events.
Australian Technical Support, Calibration & Consumables
- Brisbane-based phone & email technical support from field engineers with 20+ years automation experience
- On-site calibration service across QLD, NSW, VIC with calibration certificate
- Reagents and consumables stocked locally — DPD for free chlorine, formazin for turbidity, all pH and conductivity standards
- Replacement sensors, O-rings, and fittings dispatched same business day ex Brisbane
- Trade pricing for integrators, councils, water utilities, pool & spa contractors
Request a Trade Quote
Panel builders, system integrators, council water departments, water utilities, and food & beverage engineers get volume trade pricing. Submit a quote request and we’ll respond within one business day with stock, pricing, and lead time.
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