Emerson Net Safety ST3 Reference Manual
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Emerson Net Safety ST3 Reference Manual

Xchem electrochemical sensors
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Reference Manual
00809-0100-4303, Rev AB
November 2020
™
Net Safety
ST3
XChem Electrochemical Sensors

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Summary of Contents for Emerson Net Safety ST3

  • Page 1 Reference Manual 00809-0100-4303, Rev AB November 2020 ™ Net Safety XChem Electrochemical Sensors...
  • Page 2 All sales are governed by Emerson's terms and conditions, which are available upon request.
  • Page 3 warranty clause shall be borne by Buyer unless accepted in writing by Seller. Goods repaired and parts replaced by Seller during the warranty period shall be in warranty for the remainder of the original warranty period or 90 days, whichever is longer.

  • Page 5: Table Of Contents

    4.4 Troubleshooting........................25 4.5 Storage............................25 4.6 Spare parts and accessories....................... 25 Chapter 5 Electrostatic sensitive device..................27 Chapter 6 Wire resistance table....................29 Chapter 7 Product certifications....................31 7.1 Installing in North America......................31 7.2 North America........................... 31 7.3 IECEx............................31 Net Safety ST3...
  • Page 6 Contents Reference Manual November 2020 00809-0100-4303 Emerson.com/FlameGasDetection...

  • Page 7: Chapter 1 Introduction

    Introduction Models covered Emerson has designed the ST3 XChem electrochemical toxic gas sensors for use with the Net Safety Millennium II Transmitter (models M21, M22, or M2B). This sensor is both versatile and reliable, for fast, accurate, and continuous monitoring of gases in extreme environments.

  • Page 8: Product Recycling/Disposal

    Introduction Reference Manual November 2020 00809-0100-4303 Important Ship all equipment prepaid. Emerson will not accept collect shipments. Product recycling/disposal Consider recycling equipment and packaging. Dispose of the product and packaging in accordance with local and national legislations and regulations. Emerson.com/FlameGasDetection...

  • Page 9: Chapter 2 Install

    In this case, to compensate for the effect of distance, consider decreasing Net Safety ST3...

  • Page 10: Mounting

    (jet lube, etc.) to the threading of the ¾-in. female national pipe thread (FNPT) conduit entry of the enclosure as well as the threading on the sensor ¾-in. male national pipe thread (MNPT) fitting. This aids in protecting the enclosures from water. After Emerson.com/FlameGasDetection...
  • Page 11 Always mount the sensor vertically such that its mouth is pointed in the downward position as shown in Figure 2-2 Figure 2-3. Figure 2-2: Sensor Mounted to a Net Safety Millennium II Transmitter A. ¾-in. national pipe thread (NPT) B. ATEX locking collar C. Sensor pointing downwards D. Sensor mouth Net Safety ST3...
  • Page 12 Install Reference Manual November 2020 00809-0100-4303 Figure 2-3: Sensor Mounted to Net Safety Millennium II Basic Transmitter and Junction Box A. ¾-in. NPT B. ATEX locking collar C. Sensor mouth D. Sensor pointing downwards Emerson.com/FlameGasDetection...

  • Page 13: Dimensional Drawings

    5.9 (150) 5.6 (142) 5.1 (130) 5.4 (137) 4.6 (117) 9.7 (246) 8.9 (226) 6.0 (152) 6.0 (152) 5.7 (145) 5.8 (147) 2.6 (66) 2.6 (66) 2.9 (74) 2.9 (74) 4.1 (103) 3.9 (100) 0.157 (4) 0.157 (4) Net Safety ST3...
  • Page 14 4.7 (119) 4.8 (122) 3.6 (91) 3.6 (91) 3.6 (91) 3.6 (91) 4.7 (119) 4.8 (122) 5.1 (130) 5.1 (130) 0.3 (7,6) 0.3 (7,6) 2.6 (66) 2.6 (66) 2.9 (74) 2.9 (74) 2.8 (71) 3.0 (76) 8.9 (226) 9.0 (229) Emerson.com/FlameGasDetection...

  • Page 15: Wiring

    2.6.3 Install to transmitter or junction box Emerson supplies the Net Safety ST3 with a ¾-in. national pipe thread (NPT) male conduit connection. Mount the sensor directly to an available ¾-in. NPT conduit entry on a Net Safety Millennium II Transmitter or remotely using a certified junction box.
  • Page 16 3. Connect the sensor wires to the Net Safety Millennium II Transmitter or junction box as per the appropriate transmitter or junction box manual. Figure 2-7 outlines the connections to a Net Safety M21 Millennium II Transmitter. Table 2-3 outlines the wire colors and their purpose. Emerson.com/FlameGasDetection...
  • Page 17 D. Channel #2 4-20 mA signal E. Earth ground F. White wire G. Red wire H. Blue wire I. Black wire J. M2 transmitter terminal board K. Channel 2 sensor terminals L. Channel 1 sensor terminals M. Sensor Net Safety ST3...

  • Page 18: Calibration

    Calibration Note Power up the Net Safety ST3 sensor for at least 24 hours before completing the first calibration. Although Emerson calibrated the sensor at the factory, this calibration may have been disrupted after shipment, and calibration after installation is necessary to ensure performance.

  • Page 19: Chapter 3 Operate

    The warm-up time for the Net Safety ST3 sensor is typically between 30 and 90 seconds depending on the sensor type; the Net Safety ST341 oxygen sensor could take up to an hour to warm up.

  • Page 20: Sensor End Of Life Diagnostic

    Contact Net Safety for replacement sensor modules. Sensor communication The Net Safety ST3 sensor uses a proprietary protocol to communicate with the Net Safety Millennium II series of transmitters. Never connect this sensor to any device other than the Net Safety Millennium II series of transmitters.

  • Page 21: Configure Net Safety Millennium Ii Basic Transmitter

    00809-0100-4303 November 2020 Configure Net Safety Millennium II Basic Transmitter When using the Net Safety ST3 sensor with the Net Safety Millennium II Basic Digital transmitter model (M2B-D), you can change the sensor's range by accessing a specific ® Modbus register.

  • Page 22: Fault Conditions

    Reference Manual November 2020 00809-0100-4303 Fault conditions The Net Safety ST3 sensor provides a number of fault conditions that the Net Safety Millennium II transmitter translates into an analog or fault relay output. These fault conditions are outlined in Table 3-1.

  • Page 23: Chapter 4 Maintenance

    4.1.2 Cross sensitive gases for carbon monoxide sensor (Net Safety ST360) Table 4-2: Cross Sensitive Gases/Compounds Cross sensitive gas Cross sensitive gas Reading concentration Hydrogen sulfide 15 ppm < 0.1 ppm Sulfur dioxide 5 ppm 0 ppm Net Safety ST3...

  • Page 24: Bump Testing

    Replace sensor module Emerson pre-calibrates the sensors at the factory; however, you must perform field calibration as a part of commissioning. When the sensor end of life diagnostic indicates a fault condition, you can no longer calibrate, or the sensor is not working properly, you may need to replace the sensor module.

  • Page 25: Troubleshooting

    Troubleshooting Emerson did not design these sensors and transmitters to be repaired in the field. If problems should develop, first check for faulty wiring, confirm proper voltage to the sensor, and try to calibrate.
  • Page 26 ST341: 25 (O ST360: 1000 (CO) Ingress protection filter IPF-001 2-in. (50.8 mm) pole mounting kit UN-MK-32 Duct mounting kit UDM-001 (3.3 ft. [1 m] sampling pipe) UDM-002 (4.9 ft. [1.5 m] sampling pipe) UDM-003 (direct mount to duct) Emerson.com/FlameGasDetection...

  • Page 27: Electrostatic Sensitive Device

    Ensure ALL personnel are educated and trained in ESD control procedures. In general, exercise accepted and proven precautions normally observed when handling electrostatic sensitive devices. A warning label is placed on the packaging, identifying products using electrostatic sensitive semiconductor devices. Net Safety ST3...
  • Page 28 Electrostatic sensitive device Reference Manual November 2020 00809-0100-4303 Emerson.com/FlameGasDetection...

  • Page 29: Wire Resistance Table

    15.20 6500 (1981.2) 66.00 41.50 26.10 16.40 7000 (2133.6) 71.10 44.70 28.10 17.70 7500 (2286) 76.10 47.90 30.10 19.00 8000 (2438.4) 81.20 51.10 23.10 20.20 9000 (2743.2) 91.40 57.50 36.10 22.70 10,000 (3048) 102.00 63.90 40.20 25.30 Net Safety ST3...
  • Page 30 Wire resistance table Reference Manual November 2020 00809-0100-4303 Emerson.com/FlameGasDetection...

  • Page 31: Chapter 7 Product Certifications

    Class 1, Zone 1, AEx d IIB+H T5 Gb Type 4X, IP64 IECEx Markings Ex db IIB+H T5 Gb -40 °C ≤ Tamb ≤ +75 °C Special Condition of Use: Flameproof joints are not intended to be repaired. Net Safety ST3...
  • Page 32 Facebook.com/Rosemount Emerson family of companies. All other marks are the property of their respective owners. The Emerson logo is a trademark and service mark of Emerson Electric Co. Net Safety is a Youtube.com/user/RosemountMeasurement mark of one of the Emerson family of companies. All other marks are the property of their...

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