Connecting WMT700 cables - WMT700

Connecting WMT700 cables Technical Note
Product status
Document code
M212210EN-D
ft:locale
en-US
Product
WMT700
Document type
Technical note
If you have the integrated cable option, the cable is already permanently mounted to the sensor body at the factory and you do not need to connect the cable to your WMT700.
WMT700 integrated cable
CAUTION Do not try to open or modify the bottom connector of WMT700. The connector is not detachable and opening it may damage the sensor.
CAUTION Tighten the connector properly to avoid water leakage and damage to the sensor. Failure to tighten the connector properly voids the warranty.
CAUTION

WMT700 cables have an easy-to-use cable connector. Tighten the connector by hand. Do not use tools. If you have a cable tightening tool supplied by Vaisala in the past, do not use it with the current cable connector.

4-mm Allen key

There are 3 WMT700 cable types:

  • The hybrid cable designed for the fully heated WMT700. You can use it with all versions.
  • The standard cable for non-heated, transducer-heated, and transducer-and-arm-heated WMT700.
  • The RS‑485 cable for RS‑485 connections only. You can use it for non-heated, transducer-heated, and transducer-and-arm-heated WMT700.
WMT700 cable types
Cable type Fully-heated WMT700 Transducer-and-arm-heated WMT700 Transducer-heated WMT700 Non-heated WMT700
Hybrid cable ✓ ✓ ✓ ✓
Standard cable ✓ ✓ ✓
RS‑485 cable ✓ ✓ ✓
CAUTION Do not use the standard cable and the RS‑485 cable with the fully heated WMT700.
  1. Loosen the M5 screws (3 pcs) with a 4‑mm Allen key and rotate the connector cover to remove it.
  2. To attach the connector, guide it to the connector slot.
  3. Align the male and female connectors.
  4. To tighten the connector, turn the locking ring. Turning the connector body may break the connector.
  5. Reattach the connector cover and tighten the M5 screws (3 pcs) with a 4-mm Allen key. Tightening torque 3 Nm.

    To verify that the cable is tight, wiggle the cable and make sure the locking ring is tight. Wiggling makes the connector tightening sleeve loose. Tighten the cable again. Repeat until firmly tight.

  6. Connect the wires according to the following table. It helps you to distinguish between the cables.
    WMT700 cables 2 m, 10 m, 15 m and 26 m
    Pin Description Hybrid/Integrated cable Standard cable RS-485 cable
    1 Operating power supply BRN 0.25 mm2 WHT 0.25 mm2 WHT 0.25 mm2
    11 Operating power supply ground BLU 0.25 mm2 GRY/PNK 0.25 mm2 GRY/PNK 0.25 mm2
    5 Heater power supply WHT/RED 1.0 mm2 GRY 0.25 mm2 GRY 0.25 mm2

    GRN 0.25 mm2
    6 RED 1.0 mm2 PNK 0.25 mm2 PNK 0.25 mm2
    7 Heater power supply ground BLK 1.0 mm2 BLU 0.25 mm2 BLU 0.25 mm2

    BLK 0.25 mm2
    8 WHT/BLK 1.0 mm2 RED 0.25 mm2 RED 0.25 mm2

    YEL 0.25 mm2
    Shield Enclosure ground
    Analog outputs
    2 Analog output AOUT2, wind direction WHT/VIO 0.14 mm2 BRN 0.25 mm2 -
    13 Analog output AOUT1, wind speed VIO 0.14 mm2 WHT/GRN 0.25 mm2 -
    17 Reference input for AOUT2 (simulated potentiometer) WHT/GRY 0.14 mm2 WHT/GRY 0.25 mm2 -
    12 Analog output ground GRY 0.14 mm2 RED/BLU 0.25 mm2 -
    COM port RS-232 RS-422 RS-485 SDI-12
    3 COM2 RS232Rx RX- RX- - GRN 0.14 mm2 GRN 0.25 mm2 BRN 0.25 mm2 (pins 3 and 4 connected inside cable)
    4 RS232Tx TX- TX- Data ORN 0.14 mm2 YEL 0.25 mm2
    14 - TX+ TX+ - WHT/ORN 0.14 mm2 BRN/GRN 0.25 mm2 RED/BLU 0.25 mm2 (pins 14 and 15 connected inside cable)
    15 - RX+ RX+ - WHT/GRN 0.14 mm2 WHT/YEL 0.25 mm2
    10 COM1 and COM2 communication ports ground WHT/BLU 0.14 mm2 VIO 0.25 mm2 VIO 0.25 mm2
    9 COM1 service port RS-485 – WHT/PNK 0.14 mm2 BLK 0.25 mm2 -
    16 RS-485 + PNK 0.14 mm2 YEL/BRN 0.25 mm2 -