Product details
Mid-Range Industrial pH Sensor — Extended Body
The InstroDirect IDH-200T Mid-Range Industrial pH Sensor – 12mm Extended Body is an extended-body industrial pH electrode with 316 stainless trim, designed for deeper-insertion installations in process tanks and WWTP return lines where a short compact probe would sit too close to the pipe wall. Built-in Pt1000, double-junction Ag/AgCl reference, and analog mV output.
Technical Specifications
| Parameter | Specification |
|---|---|
| pH range | 0 – 14 pH |
| Accuracy | ±0.02 pH |
| Reference | Double-junction Ag/AgCl, gel electrolyte |
| Temperature | 0 – 100 °C, Pt1000 ATC |
| Pressure rating | ≤ 6 bar |
| Body | 12 mm diameter, 150 mm insertion length |
| Process connection | 3/4″ NPT or G3/4 |
| Output | Analog mV, optional RS485 Modbus |
| Warranty | 12 months |
Typical Australian Applications
- Aeration basin pH monitoring
- Industrial cooling water
- Mining process water
- Large diameter pipework
- Tank-top pH monitoring with extended insertion
Why Engineers Choose the IDH-200T
- 150 mm extended body keeps the glass bulb clear of pipe-wall effects
- 100 °C temperature rating covers most industrial process streams
- Same reliable glass-bulb technology used by E+H and HACH at lower cost
Installation & Calibration
Use a 3/4″ NPT pipe boss positioned away from elbows or inlet turbulence. Recalibrate monthly with pH 4/7/10 buffers.
Frequently Asked Questions
Is this replaceable with an E+H CPS31D?
Mechanically similar footprint. The CPS31D uses Memosens digital protocol; this InstroDirect probe uses analog mV or optional Modbus. Your existing transmitter will need to accept mV or Modbus, not Memosens.
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.
