Seametrics PT12 Level Sensor X2 Integration Guide

The Seametrics PT12 level sensor measures accurate pressure and temperature readings in nearly all environments. The sensor is compatible with the X2 data logger using the SDI-12 communication protocol and sensor interface. NexSens can install a waterproof connector, or the user can wire the sensor into a NexSens UW-FWP or an external junction box for connection with an X2. Both options are vented, allowing for the sensor’s compensation for atmospheric pressure. Below is the wiring information for the sensor and information on the pre-defined SDI-12 script for the PT12.

Seametrics PT12 Level Sensor product page

Figure 1: Seametrics PT12 Level Sensor



In nearly all applications involving NexSens integration, a waterproof UW8 plug will be added to the sensor cable. However, other applications may require connection to a NexSens UW-FWP or an external junction box. The following table provides information for both applications.

Figure 2: NexSens UW-FWP J-pin out

Figure 3: NexSens UW8/UW-FWP Plug pin out


NexSens UW8/
UW-FWP Plug Pin
UW-FWP J Pin*NexSens UW8-FLx Wire Color**Seametrics PT12 Wire ColorSignal

*NexSens UW-FWP Field Wireable Plug
**NexSens UW Plug to Flying Lead Cable


X2 Script Information

The X2 data logger includes a pre-loaded Seametrics PT12 (SDI-12) script. Use the CONNECT software to enable the script for sensor detection.

Configure Sensor Scripts

X2 Script NumberCommunication ProtocolBaud RatePower TypeWarmup Period (sec)Measurement Command


Script Parameters

The X2 script retrieves pressure and temperature data from the sensor. From these measurements, the X2 then calculates the overall water level based on a known conversion.



Applicable Systems

Water level measurements from the Seametrics PT12 Level Sensor are useful in various environmental monitoring applications.