Thermo Scientific 10519, Instruction Manual

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CHAPTER 1
INTRODUCTION
Thermo Environmental Instruments is pleased to provide the Model 200L Single Dilution
Probe Controller. We are committed to the manufacture of instruments exhibiting high
standards of quality, performance, and workmanship. TEI service and support personnel
are available to provide assistance with any questions or problems that may arise in the
use of this controller.
The Model 200L Single Dilution Probe Controller allows configurations for systems requiring
the need for various dilutions. With an external source of high pressured air and calibration
cylinders, the dilution controller provides the necessary means of delivering different dilution
ratios in conjunction with one dilution probe. The controller is based on the engineering
design and selection of complete components having complimentary specifications which
result in a simple to operate, easy to adapt, high accuracy, and low maintenance.
PRINCIPLE OF OPERATION
The Model 200L Single Dilution Probe Controller is utilized in conjunction with various
dilution probe configurations. The dilution probe provides the means of the actual
dilution process. The dilution probe is where the actual dilution process occurs. The
Model 200L Single Dilution Probe Controller is designed to measure stack effluents by
mixing the exhaust gases with pressurized regulated zero air at a known dilution ratio.
This method meets the requirements pertained in the E.P.A. CFR Title 40, Part 60. A
critical orifice is affixed to the probe which draws the sample or span gas through to mix
with the pressure being delivered from the instrument’s controller unit. The critical
orifice selection determines which dilution setting is necessary to meet the customer’s
requirements. Ratios of 50:1, 100:1, 150:1, and 200:1 are the most common used
configurations for combustion or other various sample monitoring. The controller allows
the user to set the dilution ratio according to the customer’s dilution settings by means of
measuring combustion emissions or other sample gases. A relay board is used to switch
the flow streams for calibration gases. A front panel rotary switch is utilized in order to
switch from calibration gas streams 1 through 5, manually or externally from a data
acquisition system. The Model 200L Single Dilution Probe Controller provides for a
variety of dilution system requirements
The dilution ratio is calculated to decrease the water moisture in the sample gas to a
percent at which the water moisture remains suspended. The use of dry instrument air for
dilution ratios in the order of 100:1 results in a sample that is 99 percent clean and dry
zero air. This is an excellent sample for analyses with ambient air analyzers. High
accuracy and freedom from interferences is assured.