Process Sensing Technologies SenzTx

Compact oxygen transmitter offered with zirconia or electrochemical sensing.

Product Overview

Manufacturer: Process Sensing Technologies
Product: SenzTx
Type: Installed measurement transmitter
Range / measured parameters: 0–1,000 ppm and percent O₂ variant ranges
Communication / outputs: 4–20 mA; Modbus options

Engineering and Selection Considerations

Confirm the exact manufacturer’s ordering code, current availability, calibrated measurement range, output protocol, power supply, operating environment and mounting requirements. Technical parameters can change between models, ordered options or product generations.

Official Technical Documentation

Official manufacturer product information →

Independent AirAlign product reference. Source reviewed 13 October 2026. The manufacturer’s technical documents remain authoritative.

SenzTx — zirconia versus electrochemical oxygen

Process Sensing Technologies SenzTx comes in zirconia and electrochemical oxygen technologies, which may differ markedly in expected gas temperature, maintenance, measuring range and sensor lifetime. Select on actual process composition and whether ppm-level trace oxygen or percent oxygen is needed. Confirm the calibration and sample-handling setup before choosing the 4–20 mA/Modbus option. Do not apply the electrochemical cell lifetime or zirconia temperature limits to every SenzTx suffix.

PST / Ntron SenzTx — zirconia versus electrochemical O₂ — verified technical selection

Source-specific engineering data for the model and its defined variant. All specifications are maker statements and are not an independent AirAlign test or approval.

Parameter	Manufacturer specification	Practical limitation
Sensor technology choices	Zirconia (ZR) or electrochemical (EC) oxygen element	EC is specifically useful for background gases containing hydrocarbons that may be unsuitable for hot zirconia sensing.
ZR ranges	0–1000 ppm, 0–1%, 0–25% or 0–96% O₂ family options	Hardware range/technology is order-code dependent.
EC ranges	0–1000 ppm or 0–25% O₂ per original data sheet	Do not assign the 0–96% ZR range or ZR lifespan to electrochemical version.
Accuracy / response	±2% of reading or 2 ppm O₂ (at calibrated conditions); T90 less than 10 s	Sample flow, pressure and gas composition can change practical response.
Supply / communications	24 V DC, ≤50 mA; 4–20 mA analog plus RS485 Modbus	Use OEM M12 pin assignment and permitted bus loading.
Environment by technology	ZR −20…+50 °C; EC 0…+45 °C; 900–1100 mbar absolute	Different technology options have nonidentical ambient conditions.
Expected consumable life	2019 data table: ZR 3–5 years; EC ~1 year, depending on use	Sensor life is not guaranteed indefinitely despite broad family marketing.
Body / process connection	IP66 anodized aluminum, 47 mm diameter, 120–140 mm length; KF40 flange, flowthrough or orifice	Specify true sample-line and chamber compatibility.

System integration and commissioning

The original PST data sheet contrasts non-depleting hot zirconia electrochemistry with consumable EC measurement. It reports ZR longer-term durability while the EC model is more suitable for certain hydrocarbon backgrounds. Do not present any SenzTx as a certified personal oxygen deficiency monitor; it is an OEM industrial process transmitter. At commissioning, verify the 4 mA and 20 mA readings correspond to the chosen ppm or %O₂ scale, identify sensor technology, test Modbus fault paths and document sample pressure/flow control. The older manufacturer revision is clearly labelled; current part-number/certificate and availability need checking for procurement.

Original technical reference: Manufacturer model page, specification or data sheet. Verify the exact purchased suffix and revision, certificates and calibration assumptions.

AirAlign technical editorial enrichment · 25 October 2026. Published specs are not independent laboratory, hazardous-area certificate or active procurement signoff.