Products > SenzTx Oxygen Transmitter


The SenzTx is a compact and robust O2 transmitter that utilises zirconia or electrochemical technology to give a reliable measurement of oxygen concentration. The zirconia sensor offers fast response time and a long service life with virtually no drift, whilst the electrochemical sensor allows measurement in background gases containing hydrocarbons.

The minimum output range of 0 to 10ppm is ideal for nitrogen generation or glove box monitoring. The SenzTx transmitter can also be supplied with measuring ranges up to 0 to 96% O2 for oxygen concentrators.

The flexibility is further enhanced by process connection multiple output options.

  • Zirconia or electrochemical sensor technology options
  • Measurement range: 0 to 10ppm up to 0 to 96% O2
  • RS 485 modbus protocol
  • 24VDC power supply
  • KF40 Flange, Flowthrough and Flow Orifice process connection options available
  • Combined Sensor & Electronics allows for ease of integration.
  • Lightweight and robust (< 0.3Kgs)

More details


Technical Specifications
Measurement Technology Zirconia (ZR) Electrochemical (EC)
Measurement Range 0 to 1,000ppm / 0 to 1% /
0 to 25% / 0 to 96%
0 to 1000ppm / 0 to 25%
Output resolution ( for %) 0.01%
Output resolution (for ppm) 1ppm
Accuracy +/-2% of reading (or 2ppm O2) @ calibrated temperature and pressure
Response time (T90) <10 seconds @ 25˚C (within selected range)
LDL (Sensitivity) 0.01% (when measuring %) / 1ppm (when measuring ppm
Temperature range -20˚C to +50˚C 0˚C to +45˚C
Pressure range 900 to 1100 mBarabs
Linearity +/- 2% of reading
Life expectation 3-5 years 1 year
Humidity 0-95% RH non-condensing
Shelf life No shelf life
Electrical Input / Output
Power supply 24VDC ±10%
Power consumption Maximum 50mA @ 24VDC
Signal output 4-20mA
Digital communications RS485 Modbus protocol. Multiple devices can be connected in a linear series
Electrical Interface M12 x 1.5 connection
Cable length 1 metre / 3 metre / 10 metre
Mechanical Specifications
Dimensions 47mm Diameter x 120mm to 140mm depending on connection type
Weight 0.260kg
Wetted materials Aluminium, PTFE, Viton
Process connection Flowthrough / Flowthrough + Orifice / KF40 Flange
Ingress protection IP66
Housing material Anodised aluminium
Certification Complies with EMC Directive 2004 / 108 / EC. UL/ETL Certification Number: UL-61010-1