Seametrics PT12 Level Sensor X-Series Integration Guide
Real-Time Water Level Measurements
The Seametrics PT12 level sensor measures accurate pressure and temperature readings in nearly all environments. The sensor is compatible with NexSens X-Series data loggers using the SDI-12 communication protocol and sensor interface. A pre-defined script on NexSens X-Series data loggers is able to detect, log, and transmit all parameters available on the sensor. Parameter data is transmitted, in real-time, at a user-specified interval (e.g., 10 minutes) to the NexSens WQData LIVE Web Datacenter. There, data is stored on customizable dashboards with statistics and graphical interfaces for each parameter. Users can download and send data reports via Email, FTP, or an API. Below is information on the settings and wiring required to integrate these sensors with a NexSens X-Series data logger.
Figure 1: Seametrics PT12 integration with NexSens X-Series data loggers for real-time water level measurements.
Compatible Models
Seametrics provides PT12 models that are available to measure from 5 to 300 PSI, or~11.5 to 700 feet of water, respectively. The model of the sensor does not affect the wiring or integration outlined below.
Figure 2: Seametrics PT12 Level Sensor
Sensor Integration
All default settings on the PT12 sensor will work with NexSens X-Series data loggers. Once the sensor is wired or connected properly, a pre-defined script on the data logger will automatically detect the sensor.
1. Wiring
In nearly all applications involving NexSens integration, a waterproof UW8 plug will be added to the sensor cable. However, in other applications, when the sensor cable requires protection, it may need a connection to a NexSens UW-FWP or an external junction box. Both options are vented, allowing for the sensor’s compensation for atmospheric pressure. The SDI-12 interface allows for an automatic barometric compensation in absolute units.
 Figure 3: NexSens UW-FWP J-pin out |  Figure 4: 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 Color | Signal |
| 2 | J2 | Black | Blue/Shield | Ground |
| 5 | J5 | Red | White | +12V |
| 6 | J6 | Brown | Brown | SDI-12 |
*NexSens UW-FWP Field Wireable Plug
**NexSens UW Plug to Flying Lead Cable
2. Automatic Sensor Detection
After wiring in the proper signal connections to an X-Series data logger, the sensor can be programmed onto the logger via automatic detection.
X-Series Logger Detection and Script Information
The X-Series data loggers include a pre-loaded PT12 script, which must be enabled before detection.
| Logger Script Number | Communication Protocol | Baud Rate | Power Type | Warmup Period (sec) | Measurement Command |
| 2013 | SDI-12 | 1200 | Switch | 5 | C |
Script Parameters
The X-series script retrieves pressure and temperature data from the sensor. From these measurements, the logger then calculates the overall water level based on a known conversion factor.
| Parameter | Units |
| Pressure | PSI |
| Temperature | C |
| Level | ft |
| Battery | V |
3. Setting up WQData LIVE
Once an X-Series data logger has finished a new sensor detection, it will automatically push the sensor configuration to the WQData LIVE web data center. Follow the three articles below to create a WQData LIVE account and a project/site. Then add the data logger to the project using the included claim code.
- Create a WQData LIVE Account
- Create a Project on WQData LIVE
- Add a Data Logger to a Project on WQData LIVE
Real-Time System Application
Real-time water level measurements from Seametrics PT-12 Level Sensors are useful in various environmental monitoring applications.
Applicable Systems
Water level measurements from the Seametrics PT12 Level Sensor are useful in various environmental monitoring applications.
Case Studies
Read about specific applications using Seametrics PT12 Level Sensors.
- Wetland Research And Management
- Tracking Water Impoundment Levels
- Great Lakes E. Coli Forecasts
- Real-Time Beach Monitoring
- Green Roof Monitoring
- Buck Creek Dam Removal & Restoration
- Flood Alert System
- Wetland Monitoring
Water Level Measurements
Learn more about water level measurements on the NexSens Blog Page.
Sensor Manual
For additional information on the Seametrics PT12 Level Sensor, please refer to the PT12 Pressure Sensor Manual.