Product details
Premium Industrial pH Sensor — Long-Life Reference
The InstroDirect IDH-350T Premium Industrial pH Sensor – Long-Life Reference is a premium-grade industrial pH electrode designed for maximum service life in demanding process applications. Features a large electrolyte reservoir, triple-junction reference with ceramic and polymer diaphragms, and enhanced glass formulation for extended linearity in extreme pH conditions.
Technical Specifications
| Parameter | Specification |
|---|---|
| pH range | 0 – 14 pH (extended linearity 0 – 14) |
| Accuracy | ±0.01 pH |
| Temperature | 0 – 110 °C |
| Pressure | ≤ 10 bar |
| Reference | Triple-junction Ag/AgCl, high-volume electrolyte |
| Body | 316 SS, PEEK internals |
| Output | Analog mV or RS485 Modbus |
| Service life (typical) | 18–36 months |
| Warranty | 12 months |
Typical Australian Applications
- Continuous process control in demanding chemistries
- Mining concentrate neutralisation
- Electroplating pH control
- Sulfur dioxide scrubbing
- Flue gas desulfurisation
Why Engineers Choose the IDH-350T
- Triple-junction reference resists most industrial poisons (sulphides, proteins, heavy metals)
- Large electrolyte reservoir extends service life to 18–36 months
- Enhanced glass formulation delivers linear response across full 0–14 pH range
- Lower total cost of ownership vs. equivalent E+H or HACH premium electrodes
Installation & Calibration
Install with the glass bulb fully submerged at all times — even brief drying damages the bulb. Store in buffer solution or 3M KCl when out of service.
Frequently Asked Questions
Does this justify the higher cost over the IDH-300T?
Yes where service intervals or reference poisoning are the bottleneck. For clean process water the standard IDH-300T is equivalent.
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.
