| | Flue Gas Analysis System | General Information |
| | | | |
| | | | |
| | | | |
| | | | |
3.2 Optional Features
The following optional features are available with the system.
•Integral Alarm Circuitry
One (Model 326B-1) or two (Model 326B-2) adjustable, full- scale alarm and/or control circuits are available.
Control over an external circuit is achieved by a relay whose solenoid coil is operated by an electronic “comparator” circuit. The switch contacts of the relay (NC/C/NO) are available for interconnection with customer circuitry at the terminal strip within the analyzer. The control point at which the analyzer operates is determined by the setting of a calibrated dial-equipped potentiometer on the control panel.
The 0–10% range of the standard Model 326B is directly related to the decade nature of the turns-counting dial; the 0–5% and 0–2% ranges require a simple extrapolation exercise to determine the proper dial reading for a given oxygen level within the limits of their range.
The integral control circuitry can be arranged so the relay is energized above or below the setpoint. Unless otherwise specified, the control relay in a single setpoint instrument (Model 326B-1) will be energized downscale from the set position: relays in a double setpoint instrument (Model
326B-2) will be energized when the oxygen level is reading in the scale region-ion between setpoint #1 in the lower region of the scale) and setpoint #2 (in the upper portion of the scale). These configurations provide power supply as well as oxygen alarm information. The relays are arranged to be in an energized condition when the oxygen concentration of the sample is in the safe region of the scale.
The form “C” SPDT relay contacts are rated at 3 amperes (non-inductive).
TELEDYNE BROWN ENGINEERING | 7 |