Envco – Environmental Equipment

The WaterLOG® H-3531 FlashLite™ is a NIST traceable pressure sensor. The sensor directly measures dry gas with accuracy better than 0.02% FSO.

Directly measure dry air gas pressure
Pressure accuracy is 0.02% full scale
Accuracy over temperature range exceeds ±0.02 ft. of water
Built-in temperature compensation
Operating temperature range -40 to +60 C
Easy to use Simple RS-232 Menu Interface
SDI-12 output provides measurement data in engineering units such as feet or meters
Standard mode: Quadrature, 0-5V, and RS-232
Low current operation (Less than 1mA standby)

The WATERLOG® H-3531 FlashLite™ is a Highly accurate digital pressure transducer specifically designed for water level monitoring. The H-3531 FlashLite™ directly measures sdry
gas pressure over a broad temperature range. The typical application of the H-3531 FlashLite™ is to be used with the H-355 Gas Purge System however, the H-3531 FlashLite™ is a easy to setup pressure sensor that can be used in many other applications.

The H-3531 FlashLite™ has SDI-12, RS232, and Modbus “smart” digital interfaces together with Quadrature, 0-5V analog and 4-20mA output options. The H-3531 FlashLite™ makes multiple pressure measurements, averages the results and converts the measurement data into units of PSI, Feet, Meters or other engineering units.

The H-3531 FlashLite™ is easy to use and works with any SDI-12 V1.3 compliant data recorder with the exception of the SDI-12 CRC commands. The “Serial-Digital Interface” is ideal for data logging applications.

The H-3531 FlashLite™ has the following features:
• Simple to install, use, and maintain (no on-site calibration required).
• Battery operation with minimal drain.(Less than 1 milliamp)
• Performs extremely accurate measurements of dry gas.
• Linear deviation is less than 0.02%
• Resolution is 1 part in 1,000,000
• Accuracy over temperature range exceeds ±0.02 ft. of water.
• Enclosure is nonconductive and corrosion proof.
• Sensor has an atmospheric vent for compensation of barometric pressure changes.
• Extended SDI-12 commands for setting the Stage to the current water elevation.
• RS-485 Modbus RTU mode interface.(Industrial mode only)
• RS-485 H-355 Gas Purge System control.(Industrial mode only)
• Simple RS232 menu interface for quick setup time.(No external module required)

Designed to output
1. 4-20 mA signal.(Industrial mode only)
2. 0-5V signal.(No external module required)
3. Quadrature signal.(No external module required)
4. RS232 signal.(No external module required)

Ordering Information
H-3531"FLASHLITE”™ Non-Submersible Pressure Transducer (Dry Gas Only) Includes 6 ft. hook-up cable. Each unit comes standard with SDI-12, RS-232, 4-20mA, and MODBUS outputs. 0-5V and Quadrature outputs are available upon request. Standard PSI ranges are 15 and 30. 50 PSI available for additional

H-3521 and H3531 “FLASHLITE”™ Accessories
H-3531-7PCABLE 7-Conductor Interface Cable; Power, SDI-12, Control
H-3531-3PCABLE3-Conductor Interface Cable; RS-232

Extended SDI-12 command for setting the

Stage to the current water elevation or pressure Programmable continuous update outputs