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SOR T21 General Instructions Manual
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SOR T21 General Instructions Manual

Thermal differential switch
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The T21 Point Level Switch is a state-of-the-art in liquid level and interface measurement
and control. Level detection is accomplished by using a high-resolution thermal differential
technique. The sensor wetted parts are of durable 316L series stainless steel, all-welded
construction and contain no moving parts. The switch is easy to install and adjustable
providing reliable, low-maintenance performance in the most demanding applications.
able, low maintenance performance in the most demanding ap
NOTE: If you suspect that a product is defective, contact the factory or the SOR
t th t
Representative in your area for a return authorization number (RMA). This product should
only be installed by trained and competent personnel.
Design and
specifications are
subject to change
without notice.
For latest revision,
go to sorinc.com
Form 1024 (01.20) ©SOR Inc.
d t i d f ti
t t th f t
Installation
Mechanical ................................ 2-3
Electrical .....................................4
Set up and Operation ...........................5
Dimensions .................................... 10
Cleaning ........................................ 11
Troubleshooting ........................... 11-12
Registered Quality System to ISO 9001
T21 Thermal
Differential Switch
General Instructions
®
th SOR

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  • Page 1: Table Of Contents

    Differential Switch General Instructions The T21 Point Level Switch is a state-of-the-art in liquid level and interface measurement and control. Level detection is accomplished by using a high-resolution thermal differential technique. The sensor wetted parts are of durable 316L series stainless steel, all-welded construction and contain no moving parts.

  • Page 2: Mechanical

    Mechanical Installation The T21 has a 3/4-inch MNPT mount (standard), designed for easy installation through a threaded port. Conduit is recommended for all wiring to the switch. Due to the pipe thread mounting, it may be necessary to make a trial fit, add or remove teflon tape or other pipe thread sealant and reinstall to achieve a satisfactory seal with the sensor properly oriented.
  • Page 3 Flow Unit can be mounted above or below pipe. Mounting on top of pipe is displayed above. Nozzle/Coupling length + Pipe wall thickness *Sensor Length = + 25% of pipe I.D. - Thread engagement 3/12 Form 1024 (01.20) ©SOR Inc.

  • Page 4: Electrical

    NOTE: Connect ground wire to the ground screw located in back of instrument enclosure. A ground wire must be attached to the ground screw located inside and on the back of instrument head for proper operation. 4/12 Form 1024 (01.20) ©SOR Inc.

  • Page 5: Setup And Operation

    A. (See , page 9) L2 Green Relay Coil Relay Flow Sensor Status Red LED Status Contact Status No flow or flow below set point De-energized Flow or flow above set point Energized 5/12 Form 1024 (01.20) ©SOR Inc.

  • Page 6: Calibration For Level Switches

    Remove the instrument enclosure lid by turning it counterclockwise. Apply power to the T21. Allow 5 minutes for the T21 to warm up. Verify J1 jumper is in the level position (Factory Default). Ensure that the tank liquid level is below the probe sensor tips and the tips are dry.
  • Page 7 L1 Red “ON” for Dry/No Flow L2 Green “ON” for Wet/ Full Flow Fuse Trip Adjust PC Board Retention Screw (2) Position High Flow/Level Postion Low Flow 7/12 Form 1024 (01.20) ©SOR Inc.

  • Page 8: Calibration For Flow Switches

    Remove instrument enclosure lid by turning it counterclockwise. Apply power to the T21. Allow 5-minute warm-up. Verify J1 jumper is in low flow setting if air/gas flow rate is approximately 20 f/s and below (factory default). For liquid or high air/gas flow rates, the jumper should be in high flow/level position.
  • Page 9 1. Insertion Length should be approximately 1/4 Pipe I.D. 2. The unit should be installed on a straight pipe run with at least 10 pipe diameters upstream and 5 Position pipe diameters downstream. Postion 9/12 Form 1024 (01.20) ©SOR Inc.

  • Page 10: Dimensions

    Dimensions are for reference only. Contact the factory PROCESS for certified drawings CONNECTION for a particular model number. 156.0 19.1 3/4 NPTM 6.14 0.75 175.0 19.1 1 NPTM 6.89 0.75 Linear = mm/inches Drawing 0390596 10/12 Form 1024 (01.20) ©SOR Inc.

  • Page 11: Cleaning

    Lime deposits can be safely removed by soaking in 20% hydrochloric acid. Warming to 150°F is permissible to speed this process. For unusual cleaning problems, contact the SOR factory to determine the exact materials of construction and chemical compatibility before using strong acids or unusual cleansers.
  • Page 12 • If all else fails, check the integrity of the sensor and boards (for step-by-step instructions see the Thermal Differential Point Switch_1024 General Instruction Manual on sorinc.com) Power and Continuity Verification Turn the power off to the T21 Switch. Remove the instrument enclosure cover. Loosen the PC board capture screws. (See , page 4) Unplug the PC board from the instrument enclosure by pulling straight out on the transformer.