Instructions for interfacing the Vaisala WXT520 with a NexSens iSIC data logger:

IMPORTANT: Review the manufacturer’s manual for the sensor to ensure that the sensor is properly configured for integration with a third party data logger prior to connecting the device to the iSIC.

1. Route cables and wires through one of the gland fittings installed on the iSIC enclosure.

2. Unplug the green terminal strip from the iSIC before inserting sensor wiring. The left terminal strip is designated for digital inputs (RS-485, RS-232, SDI-12, etc.) ; the right for analog inputs (mV, 4-20 mA, etc.).

3. Connect the sensor wires to the terminal strip as shown in the diagram below.

IMPORTANT: Verify that no wires are loose or clamped on the insulation as this will cause intermittent or failed communication. Seal and caulk the gland fitting to prevent moisture intrusion and maintain the NEMA4X rating of the iSIC enclosure.


Vaisala WXT520

Figure 1: Wiring a Vaisala WXT520 into an iSIC Data Logger.


  • The WXT520 must be wired to pin BAT for consistent averaging and data collection. Switch power should not be used.
Vaisala WXT520 - Internal Wiring

Figure 2: The internal wiring of the Vaisala WXT520


Vaisala WXT520 Wiring Table

Figure 3: Table for wiring a Vaisala WXT520 to an iSIC Data Logger.


4. Add the Device through the iChart Setup Device Wizard, and refer to the iChart Knowledge Base for additional information and troubleshooting.


REV: 13G29

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