Product details
Industrial Process pH Sensor — 100°C Rating
The InstroDirect IDH-300T Industrial Process pH Sensor – 100°C, 316 SS Trim is a heavy-duty industrial pH sensor rated for continuous operation at 100 °C and 10 bar, designed for demanding process applications such as cooling towers, boiler water, acid/caustic dosing, and petrochemical process water. 316 stainless trim, double-junction reference, Pt1000 ATC.
Technical Specifications
| Parameter | Specification |
|---|---|
| pH range | 0 – 14 pH |
| Accuracy | ±0.02 pH |
| Temperature | 0 – 100 °C |
| Pressure | ≤ 10 bar |
| Reference | Double-junction Ag/AgCl with ceramic diaphragm |
| Body | 316 SS trim, glass bulb, PEEK reference sleeve |
| Process connection | 3/4″ NPT or PG13.5 |
| Output | Analog mV (RS485 Modbus variant on request) |
| Warranty | 12 months |
Typical Australian Applications
- High-temperature cooling water
- Boiler blowdown pH
- Acid/caustic dosing loops
- Pulp & paper process water
- Refinery and petrochemical process monitoring
Why Engineers Choose the IDH-300T
- 10 bar pressure rating exceeds most standard process pH probes
- Ceramic diaphragm resists pressure-driven electrolyte loss
- 316 SS trim handles chloride-rich and weak-acid chemistries
- PEEK reference sleeve extends life in aggressive media
Installation & Calibration
Install at a point where the process temperature is stable (not at the outlet of a heat exchanger). For continuous 100 °C service, plan on 6–12 month electrode replacement.
Frequently Asked Questions
Will this work in steam condensate?
Below 100 °C and 10 bar, yes. For higher temperatures or saturated steam exposure, ask about our PEEK-bodied IDH-500T.
Australian Technical Support & On-Site Calibration
- Australian field engineers with 20+ years of industrial automation experience — phone and email support during AEST business hours.
- On-site pH calibration service across QLD, NSW, VIC — two-point buffer calibration (pH 4 / 7 / 10) with formal calibration certificate.
- Sensor health diagnostics — slope, offset, glass impedance, and reference junction checks.
- Replacement electrodes and buffer solutions available from InstroDirect’s broader water-analysis range.
Why InstroDirect vs Endress+Hauser or HACH in Australia
InstroDirect supplies the same grade of pH sensor that Australian councils, WWTP integrators, pharma plants, and food & beverage operators specify from Endress+Hauser (CPS11D, CPS31D, CPS41D, CPS71D) and HACH (pHD, Differential pH) — at a significantly lower landed cost and without vendor lock-in.
| Factor | InstroDirect | Endress+Hauser / HACH |
|---|---|---|
| Digital protocol | Open RS485 Modbus RTU — integrates with Allen-Bradley, Siemens, Schneider, Beckhoff, or any SCADA | Proprietary Memosens / HACH SC — locked to the vendor’s transmitter |
| Technical support | Australian field engineers with 20+ years automation experience | Offshore ticket queue or authorised distributor |
| On-site calibration | InstroDirect service across QLD, NSW, VIC with formal certificate | Third-party authorised service network, longer turnaround |
| Price | Parallel-import, no distributor margin stack — typically 30–50% below equivalent E+H / HACH pricing | Premium brand with distributor markup |
| Replacement parts | Standard glass-bulb and reference cartridges | Proprietary Memosens head, tied to the brand |
Moving away from Memosens or SC digital protocols frees you to mix and match sensors with any Modbus-capable transmitter or PLC. InstroDirect pH electrodes drop straight into an existing control system without a new proprietary transmitter.
Request a Trade Quote
Panel builders, integrators, council water departments, and pharma/process teams get volume trade pricing. Submit a quote request and we’ll respond within one business day.
