The double pass 1304 Opacity monitor meets the 40 cfr 60, appx B, Specifications 1 and ASTM-D 6216-98

High Performance Opacity Monitoring System with Double-Pass Transmissometer does not have to mean complicated -
The Model 1304 uses field proven and time tested optics and circuitry that is simple yet accurate. Each monitor and all its components are of the highest quality, pre-tested at the factory to your site specifications. The simple to follow instructions will have your monitor ready for service in hours after mechanical and electrical installation has been completed.
EMS has taken the approach to design equipment with accuracy, maintenance and serviceability as the most important features. The EMS 1304 Opacity monitor is designed with state of the art modular packaging with serviceability in mind. 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. This insures optimum reliability while enabling the system to be easily serviced and maintained in the field by plant service personnel.

User Friendly
Large numeric and letter display show legends (programmable in English as well as other languages) for the values of user defined variables. Dual five inch tall bargraphs are used for instantaneous and average opacity. A third bargraph is dedicated to window dirt accumulation. Tactile feedback membrane push buttons allow operator interface through clearly defined legends with minimum number of keystrokes. The control unit performs all vital computations with resolution of 0.1% opacity (1mg/M3). EMS Model 1304 can provide an output correlated to either stack exit opacity or mg/m3 . State of the art circuitry eliminates calibration problems due to component aging, temperature and line variations and light source aging. Outputs for recording or control are in a 4-20mA format with selectable ranges and averaging times. Display and outputs of alarms for opacity and fault diagnostics are also provided.

Service Module
The service module is used to pass signals to and from the transceiver and control unit, display opacity via digital meter, initiate maintenance zero and span cycles and insertion of external current meter in the transceiver to control unit 4-20mA loop. The service module is very useful for trouble shooting or during EPA audits as the correlated opacity can be displayed on the DPM. This feature eliminates the necessity for a second person and sometimes difficult communication between the control unit and the sensor locations.

Standard features:
Digital display, Alphanumeric Display for variables
Bar graphs for instant and average opacity and one for cal drift
EPA approved zero/span calibration technique
Communications: Modbus (RS-485 )

The Model 750 Opacity Monitor

Is a precision dual beam Transmissometer with Solid-State electronic modulated source to provides continuous, low maintenance, precision measurement of opacity, smoke and optical density in industrial applications. It is a cost-effective instrument that serves as an aid in operating pollution and/or process control equipment.

A High performance Dust/Opacity Monitoring System with Single-Pass Transmissometer
The sensor system consists of an optical transmitter mounted on one side of the stack and a detector mounted on the other. The light source is electronically modulated making it insensitive to ambient light effect and projects a collimated beam of light. The 4-20mA output range is 0-100% Opacity and can be connected to a number of devices to control or display the opacity.

Swing Away Sensor
Cleaning the optic windows is a breeze. Both sensors have alignment pins to assure no change in alignment after the sensor has been open for cleaning. Stainless Steel latches make for an air and water tight seal. Clean purge air can be connected to the inlet of the mounting flange provided to keep the windows clean for long periods of time.

Applications
Pipe duct of stacks from 1 to 36 inches can be measured. Typical uses are for bag houses, exhaust fan control, ideal for meeting Title V opacity (smoke) regulations soon to be enacted, crematoriums, oven exhaust, diesel test stand exhaust, duct fire alarm, multi-point systems and more.

EMS400 Opacity Monitor

Is designed for Opacity applications that require on-line calibration. Available as an option is a manually operated zero & span optical device to calibrate the system without shutting down the process.

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.
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.

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.

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.

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.

Audit device for EMS Opacity Monitors Model 1301, 1302 1303 & 1304 Opacity monitors.
P/N 1232, Complete kit including Audit device, 3 filters in carrying case with certificates.