NTMU02  ABB  programmable controller module

The Endura AZ20 oxygen probe measures oxygen concentration in flue gas using an in situ 'wet analysis' method. The 'wet analysis' method avoids measurement error (typically 20% of reading higher than the actual value) that is introduced by a sampling system using the 'dry analysis' method. For customers with an existing installed ZFG2 probe with a ZMT or ZDT transmitter, a 55 V heater version of the Endura AZ20 probe (the Endura AZ20 / ZFG2 replacement probe) is available

System equipment comprises a (flue-mounted) Endura AZ20 probe controlled by an integral or remote transmitter. During operation, a zirconia cell within the probe is held at a constant temperature of 700°C (1292 °F) by a probe heater and control thermocouple assembly. If the heater control circuitry or software fails (unsafe), the probe heater power supply is switched off, ensuring the system fails 'safe' and protects the heater from an over-temp failure.

An output generated at the zirconia cell is processed in the transmitter giving a locally displayed O2 reading and a 4 to 20 mA retransmission signal over any range between 0 % and 100 % O2.

Optional automatic calibration (AutoCal*) enables automatic, semi-automatic or manual calibration to be performed using a probe-mounted gas control manifold mounted within the probe head. Calibration sequencing is software-controlled from the transmitter.

Optional restrictors (where fitted*) in the probe head control the test gas and reference air flow without the need for flowmeters. The probe requires only preset test gas and reference air pressures of 1 bar (15 psi) to maintain a constant flow of 2.2 l / min (4.662 scfh). This flow is not affected by changes in the measured gas pressure of ± 0.35 bar (5 psi).

The structure and details of the product：

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