Installing the DMT153 transmitter - DMT153

DMT153 Quick Guide
Product status
Document code
M213152EN-C
ft:locale
en-US
Product
DMT153
Document type
User guide

The following installation tools and equipment are needed:

  • For transmitter models with ISO G1/2" or 3/4"-16 UNF threads:
    • Sealing ring (provided)
    • 30-mm wrench, 1 3/16" wrench, or adjustable wrench (not provided)
  • For transmitter models with 1/2" NPT threads:
    • PTFE tape (not provided) 1
    • 30-mm wrench, 1 3/16" wrench, or adjustable wrench (not provided)
The process threads of the DMT153 transmitter can have sharp edges. To avoid injury when touching the threads, wear protective gloves.

 

After selecting a suitable measurement location, install the transmitter as instructed below. Note the maximum operating process pressure for DMT153, 50 bar (725 psi), absolute.

 

  1. Remove the yellow transport protection cap from the transmitter. Do not touch the filter with your hands.
  2. Prepare the sealing of the connection.
    1. Transmitter with ISO G1/2" thread or 3/4"-16 UNF thread: place the sealing ring at the base of the thread.

      Always use a new sealing ring; do not reuse a previously installed one.

    2. Transmitter with 1/2" NPT thread: do not use a sealing ring. Instead, apply high-density PTFE tape on the thread.
  3. Make sure that the threads on the mounting point are of the correct type, and fasten the transmitter to the mounting point. Tighten the transmitter to hand-tightness.
    Do not use excessive force at this point, and check that the sealing ring (if used) remains centered.
  4. Use a 30-mm wrench to tighten the connection. If you do not have a 30-mm wrench, use a 1 3/16" wrench or an adjustable wrench.

    Tightening torques for different thread types:

    • ISO G1/2": 25 Nm with plastic sealing rings (for example, PTFE), and 25 Nm with metal sealing rings (for example, copper or aluminum).
    • 3/4"-16 UNF: 25 Nm with plastic sealing rings (for example, PTFE), and 25 Nm with metal sealing rings (for example, copper or aluminum).
    • 1/2" NPT: 25 Nm, or tighten 2–3 turns past finger-tightness.
    CAUTION Only tighten the transmitter from the 30-mm tightening nut. Do NOT apply force to other points in the transmitter body.

    You can order sampling accessories for DMT153 transmitters from store.vaisala.com.

    For more information on the sampling accessory options, see document Dew Point Sampling Cells Technical Note (B212382EN), available at docs.vaisala.com.

1 Vaisala recommends Unipak Multitape PTFE Threaded Tape (Unipak item no. 1000600) or Swagelok PTFE Tape Thread Sealant (Swagelok item no. MS-STR-8). Follow the manufacturer's instructions when applying the tape.