The SEC Signature DIR is a self-contained dual chamber optical gas analyzer designed for non-intrusive continuous monitoring of process gases. The infrared optical system is self-compensating for most aging, environmental, and contamination effects resulting in excellent measurement integrity. An industry standard analog output provides complete remote alarm, fault and calibration signals. The analog output from the device can be connected to chart recorders, data acquisition systems or a process control system.
The SEC Signature DIR measures infrared light absorption due to molecular resonances. The monitor is tuned to the infrared signature of the target gas or vapor, measuring light at wavelengths absorbed by the target gas and at wavelengths not absorbed by the target gas. The gas concentration is determined by calculating the ratios of the analytical and reference levels. Embedded linearization algorithms keep the output accurate over the entire measuring range and embedded compensation algorithms maintain measuring accuracy over changing environmental conditions.
The SEC Signature DIR employs a reliable, directly opposed optical system. No mirrors or reflecting surfaces are used in this device. All optical surfaces are heated to discourage measurement error due to condensation.
Rugged sapphire windows protect the optics eliminating the corrosive effects found in many process monitoring applications.
Once the unit is spanned to a specific mid range gas concentration (a one time operation), routine calibration consists of only rezeroing the device periodically.
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The SEC 2500 Hand Held Programmer transmits and receives infrared light from the front of the housing. The infrared light is used to establish non-intrusive communication with any SEC 2000 that is equipped with a display module. When communicating with the SEC 2000, the SEC 2500 must be pointed directly at the display module of the SEC 2000 which can be up to 15 feet away.
The Hand Held Programmer can communicate with any SEC 2000 gas detector on the same RS-485 network once infrared communication is established. Data exchange, using the infrared link, occurs at a rate of 300 baud.
The programmer has a socket at the bottom of the unit for connecting to a Data Communication Cable (P/N 147-1000C). The Data Communication Cable enables a hardwire communication connection to all SEC devices.
Once communication is established, the devices can be checked, calibrated and information can be correlated with a touch of the keypad located on the SEC 2500 Hand Held Programmer. The SEC 2500 Hand Held Programmer is certified for use in hazardous areas.