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Model WB-168 THRU WB-508 -Water Bath Vaporizers 08-Series
These models are manufactured with a European-style, high-efficiency, compact power burner. All vaporizer functions are constantly monitored by a Programmable Logic Controller with Ethernet interface (PLC; Siemens S7-1200F or Allen-Bradley MicroLogix-1400), which communicates with a graphic operator interface (HMI; color LCD display with touch screen). The operator interface is used to monitor and display the system status; any failure message will be displayed in plain English; first-outage-monitor (Alarm History) and graphic trend recording are standard. The PLC is installed together with the Honeywell flame safeguard module in the control panel, which is mounted in the vaporizer control room. The full-size, step-in control room is equipped with country-specific receptacles and light fixture.
The vaporizers are equipped with a "Smart" Liquid Carryover protection. Vapor pressure and temperature are constantly monitored by dedicated pressure and temperature transmitters in the vapor outlet. Their signals are processed in the PLC and are compared against the pressure/temperature saturation curve of the LPG that is being vaporized. The properties of the LPG (Propane/Butane percentage), and the "safety margin" (how close the pressure/temperature are allowed to come to the saturation curve) can be entered through the operator interface. If the safety margin is "breached", the liquid inlet solenoid valve is closed after an adjustable alarm delay period has elapsed.
An optional GasLeak Monitor with long-life infrared sensor monitors combustible gas levels in the control room. The vaporizer will be shut down if the concentration reaches 40% of the Lower Explosive Limit (LEL).