Ntron Senz-Tx Specifications

Page 1

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 oers 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% O

The exibility is further enhanced by process connection multiple output options.

for oxygen concentrators.

FeaturesApplications

» Gas generation (oxygen / nitrogen)

» Additive manufacturing

» Glove box purge and leak detection

» Industrial gas applications

» Zirconia or electrochemical sensor technology options

» Measurement range: 0 to 10ppm up to 0 to 96% O

» RS 485 modbus protocol

» 24VDC power supply

» M12 electrical connection

» KF40 Flange, Flowthrough and Flow Orice process connection options

available

» Combined Sensor & Electronics

allows for ease of integration.

» Lightweight and robust (< 0.3Kgs)

Issue No. STX01_V1_EN_0819

Page 2

SenzTx

Oxygen Transmitter

Proven sensor technology

With a choice of either zirconia or electrochemical sensor technology the

SenzTx oers reliability, accuracy and exibility. Both technologies have a broad measurement capability allowing the user

to measure from selected ranges from 1ppm to 96% oxygen.

Zirconia sensor

The Ntron zirconia oxygen sensor is a nondepleting zirconia solid electrolyte sensor. A small capillary on the sensor controls

the diusion of oxygen into the sensor.

When heated to over 400°C oxygen is

electronically reduced causing current ow

through the zirconia electrolyte. Zirconium-

oxide allows the movement of oxygen

ions through the substrate from a high to

a low concentration. The measurement of oxygen is determined by the current owing

through the electrodes. The zirconia sensor

has an unlimited shelf life without the loss

of calibration and has an expected life in excess of 5 years. The zirconia sensor is

not position sensitive and has low cross

sensitivity to other gases and does not dry out.

Low maintenance and cost of ownership

Due to the highly stable nature of the

sensor, a calibration interval of once per year is required, allowing for signicant cost

savings. The construction of our zirconia

oxygen sensor means that only 100 mL/ min of sample gas is required, providing application exibility and further potential

cost savings.

Fast response time

Zirconia oxygen sensors respond very

quickly to oxygen concentrations in both directions with a T90 of less than 10 seconds within a set range.

Electrochemical sensor

The key elements of the electrochemical sensors are a membrane, cathode, anode,

electrolyte and measurement circuit. The

sensing membrane (covering the cathode)

is made of PTFE and is mounted over a metal perforated electrode. The space

between the membrane and the electrode is lled either with an aqueous alkaline or an acid electrolyte. In normal operation,

all portions of the anode and cathode are immersed in the electrolyte. As oxygen

diuses through the membrane into the electrolyte it causes a reaction between

the cathode and anode generating an EMF. This current is proportional to the amount of oxygen present in the sample gas. In the absence of oxygen there is no output from

the electrochemical sensor, meaning only

one calibration is required.

Sensor contruction

The main body of the sensor is fabricated from high density PVDF. The supporting ring at the face of the sensor is constructed of stainless steel. This results in an oxygen sensor that is chemically resistant to most

sampling atmospheres and can be used with

trace solvents and hydrocarbons present in

the sample gas, unlike zirconia (due to the high temperature of the sensor).

Installation 󰍍exibility

The compact SenzTx oxygen transmitter

with its inbuilt microprocessor, is designed for OEM applications with minimal use input. With the ow through sensor with orice option, the sensor can handle up to 2 bar g and provide the correct ow through the

sensor. This eliminates the need for external

ow control.

TXi Communication & Diagnostics terminal

The TXi calibration makes set-up, calibration

and diagnostics easy. Simply connect this

unit in series with the SenzTx with the cable provided and perform the desired task without the need to look at the control panel which may be far away.

Page 3

SenzTx

Technical Speci󰍐cations

Oxygen Transmitter

Performance

Transmitter Model SenzTx

Measurement technology Zirconia (ZR) Electrochemical (EC)

Measurement range*

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 mBar

Linearity +/- 2% of reading

Life expectation 3-5 years 1 year

Humidity 0-95% RH non-condensing

Shelf life Up to 6 months

0 to 1000ppm / 0 to 1% /

0 to 25% / 0 to 96%

0 to 1000ppm / 0 to 25%

abs

Electrical Input / Output

Power supply 24VDC +/- 10%

Power consumption Maximum 50mA @ 24VDC

Signal output 4-20mA

Digital communications

Multiple devices can be connected in a linear series

Electrical interface M12 x 1.5 connection

Cable length 1 metre / 3 metre / 10 metre

RS485 Modbus protocol.

Mechanical Speci󰍌cations

Dimensions 47mm Diameter x 120mm to 140mm depending on connection type

Weight 0.260kg

Wetted materials Aluminium, PTFE, Viton

Process connection Flowthrough / Flowthrough + Orice / KF40 Flange

Ingress protection IP66

Housing material Anodised aluminium

Certi󰍌cation

Complies with EMC Directive 2004 / 108 / EC. UL/ETL Certi󰍐cation Number: UL-61010-1

Recovery from air of PPM electrochemical sensor

21%

1000ppm

900pm 800pm 700pm

600pm

500pm 400pm 300pm 200pm 100pm

0 5 10 15 20 25 30 35 40 45 50 55 60

0 to 1000ppm up to 21% Measurement Range

Response Time (T90) across 60 mins

* Outputs can be factory set to other ranges. Please see order code sheet for details.

Issue No. STX01_V1_EN_0819

Page 4

SenzTx

Technical Drawings

LED functionality

Orange LED

Modbus 485 Indicator

Green LED

Power Indicator

Oxygen Transmitter