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Introduction 1
•
Relay outputs. Single pole double throw (SPDT) relays driven
off the status signal, high, and low limit alarms can be installed
for triggering status alarms, indicators, or other customer
supplied peripherals.
•
External sample system. The instrument can be supplied with a
sample handling system ensuring safe delivery of conditioned
sample gas to the analyzer.
•
Z-Purge system. The split-architecture models can be fitted
with a Z-Purge system for automatic purging of the NEMA-4
enclosure.
1.3
IR Detection
Central to the IR7000 analyzer is the unique patented IR detector. It
incorporates 2 chambers in optical series at the end of a gold-coated
sample cell. The chambers are connected through a tiny orifice. IR is
differentially absorbed in the 2-chambered detector and causes a mass
flow between the chambers. The modulation of the IR signal causes the
chambers to quickly readjust and the flow reverses. A sensitive mass flow
sensor located in the tiny orifice between the 2 chambers senses the flow
in both directions and outputs a signal related to the concentration. A
high-resolution electronic circuit is employed to provide synchronous
detection of the flow sensor's signal. This circuit allows the IR7000 to
measure gas compositions over a wider range of the infrared spectrum
than conventional photon-based IR analyzers.
1.4
Operator Interface
Except for the split architecture models (Explosion Proof), the
analysis and control sections are housed together in a single compact
metal housing. A NEMA-4 enclosure is used on the IR7000B wall
mountable model.
All operator input and display of process information takes place
from the panel (or on the control section panel for the split architecture
instruments). There are minor differences in the location of some of the
components among the different models within the IR7000 series but each
instrument has the following front panel components:
•
Display—vacuum fluorescent with 2 lines of 16 characters.
The display sends data and information to the user about the
process and guides the operator through the calibration and
operation.
6
Teledyne Analytical Instruments, - Rev. 3
IR7000
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