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Pressure Switch, Fluid Level and Overfill Protection System
PRESSURE SWITCH & VALVE CONTROL
ACCURATE DIGITAL MEASUREMENT
SAFE FOR HAZARDOUS FLUIDS
ONE-TIME CALIBRATION
COMMUNICATIONS & MOBILE CONNECTIVITY
Pressure Switch & Valve Monitoring Matters
Critical systems such as pressure switches, valves, safety interlocks, and permit controls must work together throughout loading, transport, and unloading operations. Monitoring these functions helps operators verify system status, improve operational awareness, and respond quickly to changing conditions. SeeLeveL TrailerPlex™ brings these critical inputs and controls together in a single configurable platform, providing greater visibility, enhanced safety, and improved control of tank trailer operations.
Key Features & Benefits
Model 818
The SeeLeveL TrailerPlex™ 818 is a multi-purpose monitoring system that monitors up to eight pressure switch inputs and provides a permit signal for safe pump operation during loading and unloading.
The SeeLeveL TrailerPlex™ also functions as a liquid volume and temperature monitor.is a high-accuracy tank monitoring system for tank trucks carrying flammable or non-flammable liquids. It connects to the sender using fiber optic technology to help prevent the risk of sparking in safety-critical environments. The fiber optic cable can be cut and terminated without special tools or equipment, making installation simple and efficient. It also features Bluetooth® connectivity, onboard data logging, and communication outputs for integration with vehicle and fleet monitoring systems.
- Monitors one compartment
- Monitors up to eight safety switch inputs for loading valves, vents and pressure
- Provides liquid volume with programmable built-in alarms
- Displays the temperature with the 810-TX
- Mobile app connectivity for system setup and troubleshooting
- CAN communications supported
- Monitors a PTO signal and an external 4–20 mA pressure transducer
- Optional inactivity lock can be used to require continual operator engagement, preventing accidental overfills due to inattention
- Internal data logging
- Operates from standard 12 VDC truck power
- Compatible with the 810-TX sender bar
Operation Overview
The SeeLeveL TrailerPlex™ 818 is designed to enhance safety and help prevent operator error during loading and unloading operations. The SeeLeveL TrailerPlex™ (1) monitors up to eight ground switch inputs, pre-labeled for three valves, three vents, one load line, and one tank. It issues a permit signal only when all switches confirm a safe state or are disabled, allowing pump operations to proceed. An LED indicator for each input is displayed directly on the gauge face, so operators can quickly assess system readiness. If any switch enters an unsafe state, the module generates a fault, disables the permit signal, and requires manual fault clearance using the side-mounted button. If desired, the 818 can also monitor a PTO signal and an external 4–20 mA pressure transducer. Both or either of these can be included in the permit signal determination.
The 818 also functions as a liquid volume gauge with a 4-digit LED display that continuously shows the liquid volume and temperature in the tank. Finally, the 818 can be configured to require the operator to actively press a button to maintain system operation, ensuring continued attention during the loading process. Using a vertically mounted 810-TX Sender Bar (2), the system continuously measures liquid level and temperature and transmits the data via fiber optic cable to the display.
SeeLeveL TrailerPlex
Pressure Switch Controller
810-TX Sender Bar
*Select a numbered marker to view each system component.
SeeLeveL™ Sender Bar
810-TX Sender Bar
The 810-TX sender bar is used in liquid transport applications such as fuel, crude oil, condensate, and chemical hauling, where accurate level sensing and dependable performance are critical to safety and operations. The 810-TX features a field-replaceable lithium battery with a 10-year lifespan, and is designed for tank heights up to 87″ (221 cm). Optional stainless steel float available.
810-TX Sender Bar:
- Measures fluid level and temperature
- 1/4″ (6.35 mm) resolution and ±0.13″ (±3.3 mm) accuracy.
- Compatible with the 250-STAT_FLOAT
SeeLeveL Command™ App
Configuration Tool
The SeeLeveL Command™ App is the configuration tool for compatible transport monitoring systems. Available for Android, iOS, and Windows, the app makes it easy to configure, calibrate, monitor, and troubleshoot your SeeLeveL system. Connections can be made wirelessly through Bluetooth® or directly through the device’s internal micro-USB connection on Windows and Android devices when Bluetooth® is unavailable.
- See all compartment levels at a glance
- Set tank calibration and offset values for accurate liquid volume readings
- Configure alarm setpoints and temperature units
- View system status and device information
- Perform firmware updates
- Access troubleshooting and diagnostic tools
- Retrieve and review system logs and alarm history
Add-On Systems
Products That Enhance Functionality and Support
Enhance your core system with specialized integration products designed for your application.
Truck Grounding Controller
Explore our Resource Library
Access all technical documentation and more from our Resource Library to get the most from your SeeLeveL Systems
Contact Us For More Information
Learn how the SeeLeveL TrailerPlex™ can help you verify critical conditions and provide permit control, TrailerPlex helps support safer operations for tank trucks and trailers.
