Installation Instructions Document No. 129-460 December 12, 2017 Surface Mount Temperature Sensor Item Number 129-460, Rev. EA Page 1 of 3 Product Description The Surface Mount Temperature Sensor mounts directly on a pipe inlet and senses the temperature of water in the pipe. Product Number Product NumberOutput Signal QAD2030U 10k Ω NTC Type II Thermistor QAD2032U 10k Ω NTC Type III Thermistor QAD2012U 1k Ω Pt RTD (385 α ) QAD2020U 1k Ω @ 32°F Ni RTD QAD2021U 1k Ω @ 70°F Ni RTD 536-7804 to 20 mA (30°F to 250°F) 544-089 1k Ω Pt RTD (375 α ) Contents DescriptionQuantity Sensor1 Mounting Kit: • Junction box 1 • Strap 1 • Wire nuts 2 • No. 20 stretch tape 1 roll NOTE: 536-780 also includes 4 to 20 mA transmitter and two additional wire nuts. Required Tools • Wire cutters • Knife • Duct tape • Wire brush, sandpaper or other abrasive tool • Medium flat-blade screwdriver Expected Installation Time 13 minutes Prerequisite If the pipe is not insulated, a 12-inch to 18-inch (30 cm to 46 cm) piece of insulation will be needed to ensure an accurate temperature reading. The insulation should be at least one-inch (25 mm) thick. Installation NOTE:To ensure accuracy, the sensor must be mounted under insulation, away from drafts. Do not cut any wire from the sensor. 1. If the pipe is insulated, remove a portion of the insulation by making two cuts around the circumference of the pipe (between 6 inches and 12 inches [15 cm and 30 cm] apart). 2. Make a third cut perpendicular to the first two cuts so that the insulation can be removed in one piece. See Figure 1.Save this piece. Figure 1. Cutting the Insulation.Document No. 129-460 Installation Instructions December 12, 2017 Page 2 of 3 Installation, Continued 3. Using an abrasive tool, clean the surface of the pipe where the sensor is to be mounted to ensure good contact with the pipe. See Figure 2. Figure 2. Pipe Temperature Sensor. 4. Bend the sensor wires back along the pipe next to the sensor for strain relief. See Figure 2. 5. Secure the sensor to the pipe with 1-1/2 to three wraps of the stretch tape provided. Stretch the tape about 25% as you wrap it around the pipe. See Figure 2. 6. Wrap the excess sensor wires around the pipe and secure with the stretch tape or duct tape. See Figure 2. 7. Replace the insulation removed in Step 1, and secure it to the pipe with duct tape. NOTE: If the pipe is not insulated, wrap a piece of insulation around the sensor and the pipe (seePrerequisites). The insulation should be secured to the pipe using duct tape to ensure accuracy. Wiring 1. Position the junction box on top of the pipe insulation and feed the sensor wires into it from the bottom of the box. The box should be positioned so that the sensor wires come straight up into the junction box from the seam in the reinstalled insulation. 2. Thread the strap through the junction box and attach the junction box to the pipe. See Figure 3. Figure 3. Attaching the Junction Box and Connecting the Sensor Wires. 3. Connect the electrical conduit, with the field wiring, to the junction box. 4. Using two of the wire nuts provided, connect the sensor wires to the field wires. See Figure 3. 5. Put all the excess wire into the junction box and install the cover on the box. 6. Connect the field wires to the applicable controller. See Figure 4. Figure 4. Typical Sensor Connection. NOTE: Configure the analog input (AI) point for sensor input.Document No. 129-460 Installation Instructions December 12, 2017 Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners. ©2017 Siemens Industry, Inc. Siemens Industry, Inc. Building Technologies Division 1000 Deerfield Parkway Buffalo Grove, IL 60089 USA + 1 847-215-1000 Your feedback is important to us. If you have comments about this document, please send them toSBT_technical.editor.us.sbt@siemens.com Document No. 129-460 Printed in the USA Page 3 of 3 7.For 536-780 only,Connect the wires from the sensor to the appropriate RTD leads of the transmitter with wire nuts. Connect the field wiring to the transmitter. The positive (+) 26V supply lead goes to thePWR wire of the transmitter, and the negative signal lead goes to theSIG wire. See Figure 5. Figure 5. 536-780 (4 to 20 mA Output) Only. The installation is now complete.Next >