Detcon 1000_CO2 - Manual (Page 5)

Model 1000 CO2
Model 1000 CO2 Instruction Manual Rev. 2.2 Page 1 of 28
1.0 Introduction
The Detcon Model 1000 Series CO
2
Process Analyzer is a 110/220VAC or 24VDC powered analyzer that
provides a select gas sample mixture to an IR-640/IR-642 CO
2
gas sensor assembly. The ranges of analysis are
determined at time of order.
The NEMA 7X rating is achieved by housing all electronic components in suitable NEMA 7X enclosures.
When located outdoors, the CO
2
Process Analyzer package should be appropriately covered from direct
weather exposure. The Model 1000 Series CO
2
Process Analyzer can optionally be ordered with a full NEMA
4 enclosure.
The “Power Supply” explosion proof enclosure on the upper right side of the unit houses a 24VDC power
supply, a 24-24VDC Converter, and a terminal PCB labeled for all input and output field wiring. The
“Pump/Flow” explosion proof enclosure located on the upper left houses an air dilution pump, an activated
carbon scrubber, and optional air flow fault and sample flow fault alarm PCB’s.
The analyzer requires a constant, liquid-free, 10±2psig sample pressure, which is provided by the customer or
may be supplied by Detcon as a separate gas sample handling system.
The gas sample conditioning system includes a stainless steel pressure gauge (0-30psig), and a Genie
membrane filter to provide the analyzer with absolute condensate liquid protection. On the bypass port of the
Genie membrane filter, a 15psig over-pressure relief valve and flow control valve are also provided. The flow
control valve can be used as a sample bypass and liquid exhaust vent. The IR-640/IR-642 CO
2
gas sensor
measures the sample directly. The sample for the CO
2
sensor is set by a control valve Rotameter. A 3-way
valve is provided for manually switching between sample monitoring and span calibrations.
1.1 IR-640/IR-642 Description
Figure 1 IR Sensor Assembly
Detcon MicroSafe™ Model IR-640 carbon dioxide gas sensors are non-intrusive “Smart” sensors designed to
detect and monitor CO
2
gas in the 0-5% range. The Detcon Model IR-642 is used to measure CO
2
gas in
ranges from 0-10% up to 0-100%. One of the primary features of the sensors is its method of automatic
calibration, which guides the user through each step via instructions displayed on the backlit LCD. The