EMS400 Opacity Monitor

The EMS400 comes standard with the following features:

• PANEL MOUNT OR DIN RAIL - Compact size 3.78" x3.78" x2.52" (96x96x64mm) 
• DISPLAY - LED Back Light
• COMMUNICATIONS - RS/485 Port
• MODBUS - Supports Modbus protocol
• MEMORY BACKUP - Battery 7 years typical
• ENVIRONMENT - IP65/NEMA4
• POWER - 12/24VDC
• OUTPUTS - Two selectable range 4-20mA 0-100% Opacity.
• 6 RELAYS - SPST relays for alarms, 120VAC or DC.
• BOILER SHUT OFF - High opacity alarm triggers a boiler shut off relay contact.
• HIGH OPACITY ALARM - Two relays, adjustable set point, adjustable delay.
• EARLY WARNING ALARM - Two relays adjustable set point.
• AUDIBLE ALARM - One relay triggered by the high opacity, reset push button to silence.
• AIR PURGE ALARM - One relay triggered by EMS air purge systems.
• APPROVALS - CE and UL
   
  EMS400 Option:
  • Weather Covers
  • Airflow switch 
  • Wall mount enclosure
  • On line calibration systems
  • The EMS400 is a high performance Opacity Monitoring System with Double-Pass Transmissometer

    The stack mounting transmissometer sensor system consists of an optical transceiver mounted on one side of the stack and a retro reflector mounted on the other. The main light source is electronically modulated making it insensitive to ambient light effect and projects a collimated beam of light which is split into a reference beam and a measurement beam. The ratio-measurement technique provides continuous automatic compensation for variations in light source intensity to ensure prolonged instrument accuracy and stability.
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    The measurement beam is projected across the stack to a retro reflector which reflects it back across the stack to the measurement detector. The output of the measurement and reference detectors are transmitted to the control room mounted monitoring unit where all output signals are analyzed.
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    Manual On-Line zero and span calibration

    An optional on-line reflector kit is available. The dedicated model the reflector is calibrated to the clear condition and locked in place. Each is serial numbered to match the opacity monitor system. A slot is provided for Neutral Density filters to check the low, mid and up scale calibration.
    Non-Dedicated model is usable on any EMS opacity monitor.
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    Swing Away Sensor

    The swing away sensors make cleaning the windows a breeze and for on-line testing. Both sensors have alignment pins to assure no change in alignment after the sensor has been open and closed. Large heavy duty latches make for an air and water tight seal. The sensors are attached to the air plenum by two drop on pivot pins. This makes for easy installation and should service ever be required easy removal, just swing open and lift off the pivot pins.
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    Alignment system:

    The Tranceiver includes a built-in TTL (through-the-lens) alignment system. The alignment target can be viewed through a window on the transceiver. Adjustments to changes in alignment are provided by a 3 point alignment system which is integral to the air plenum.
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