Overview

The Level Mate III is a robust liquid level measurement system combining a stainless steel transmitter sensor with a microprocessor-controlled digital meter. It provides continuous, reliable liquid level monitoring with easy setup, calibration, and multiple output options for remote monitoring and control.

Key Features

• Two-year factory warranty
• Intrinsic safety available on select models (575S, 575P, 675)
• Solid-state silicon sensor with milliamp output
• Durable 316 stainless steel sensor housing ensuring environmental protection and media compatibility
• Sensor cable vented to atmosphere to prevent clogging
• Microprocessor-controlled meter with large dual-line 6-digit LED display
• Front panel programmable setup and function keys
• Calibration in multiple engineering units (inches, feet, meters, psi, etc.)
• Multi-pump alternation control capability
• Optional accessories: lightning/surge protectors, relay expansion modules, analog outputs, USB communication kits

Applications

Designed for industrial and commercial liquid level measurement requiring continuous monitoring, remote signaling, and control. The system supports simple installation, low maintenance, and cost-effective operation.

System Description

The system includes a stainless steel transmitter sensor with a perforated snub-nosed end to protect the sensing port. The sensor cable is vented to atmosphere for accurate pressure measurement. The meter supplies excitation voltage, displays level data, and outputs analog signals. Programmable relays support alarm/control functions, with optional isolated 4-20 mA output.

Technical Specifications

Ranges

• Feet of Water: 0 to 14, 35, 69, 138, 230, 345, 460, 690 ft
• Meters of Water: 0 to 4, 10, 21, 42, 70, 105, 140, 210 m

Transmitter

• Operating Temperature: -40° to 82°C (-40° to 180°F), media must not freeze
• Compensated Temperature Range: -5° to 55°C (23° to 130°F)
• Temperature Effect: ±1% output change per ±25°C within compensated range
• Accuracy: ±0.25% full scale (linearity, hysteresis, repeatability included)
• Output: 4 to 20 mA DC, limited to 30 mA
• Power Supply: 24 VDC from meter
• Electrical Connection: #20 AWG shielded cable, polyurethane jacket, up to 3000 ft (1622 m)
• Construction: 316L stainless steel diaphragm and housing, Viton cable grommet

Meter

• Housing: Fiberglass reinforced polyester
• Display: Dual-line LED, 6 digits each (0.60" and 0.46" high)
• Input Voltage: 85 to 265 VAC (50/60 Hz), 90-265 VDC, max 20 W
• Operating Temperature: -40° to 65°C (-40° to 150°F)
• Storage Temperature: -40° to 85°C (-40° to 185°F)
• Output: Isolated 4-20 mA, adjustable 1 to 23 mA for under/over range
• Relay Outputs: Form C (SPDT), rated 3 A @ 30 VDC or 125/250 VAC resistive load

Model Numbering and Options

Model codes specify base model, sensor type/model, display range, cable length, meter output, and surge protection options. Surge protection includes DC and AC line options for 115 VAC and 230 VAC.

Sensor Models and Cable Lengths

• Model 575S: ranges from 0-13.8 ft (4.2 m) to 0-692 ft (211 m), cable lengths 50 to 750 ft
• Other models (575P, 675, 375, SST, SDT) offer similar range and cable length options

Accessories

• Factory-installed waterproof cables with/without vent tubes
• Metal conduit connectors and cable strain relief grips for NEMA 4X housings
• Surge protectors for excitation and signal lines
• USB serial communication adapter kits for programming and data logging
• Reusable and 8" desiccants for moisture control
• 4-relay expansion modules and meter copy cables

Mechanical and Installation Details

Includes detailed mechanical drawings with dimensions, mounting hole patterns, conduit connections, and weather-tight cable seals. Sensors have nylon or Delrin snub noses for protection and cable support brackets. Meter housing rated NEMA 4 or 4X for front panel installation.

Best Practices and Recommendations

• Avoid freezing media to prevent sensor damage
• Select surge protection based on installation environment
• Calibrate meter and sensor in desired engineering units
• Use vented cables for sensors requiring atmospheric reference
• Follow installation guidelines for weather-tight sealing and cable strain relief

Additional Product Specifications

• Meter supports multiple input signals: 0-20mA, 4-20mA, 0-5VDC, 1-5VDC, ±10VDC
• Power supply accepts 85-265 VAC input
• Workmanship standards per MS-645-A with specified dimensional tolerances

Critical Information Summary

• Select sensor model and cable length appropriate for application range
• Choose surge protection options suited to power supply and environment
• Use specified accessories for cable management and environmental sealing to maintain NEMA ratings
• Adhere to workmanship and dimensional standards for reliable installation
• Consult factory for custom cable or accessory requirements

Summary

The Level Mate III system is a flexible, accurate, and durable solution for continuous liquid level measurement. Its microprocessor-controlled meter simplifies setup and monitoring, while a wide range of sensor models, output options, and protective accessories enable customization for diverse industrial applications.