The Products Section >Continuous Monitoring-Multipoint Applications

For monitoring at two or more locations, we are proud to present the product line that is the talk of the industry - Interscan's exclusive Automation-Based^(TM) Gas Detection Systems.

Now, you can specify a system with the exact operation you need, with no compromise. Our new design makes this possible.

Built around a programmable logic controller (PLC), sensors,and an operator interface (or PC), the features are limited only by your imagination.

Naturally, we can supply a system for any of the gases detected by our own sensors - but that's only the beginning. Since any sensor with an analog or discrete output connects to the PLC, you can mix and match toxic, combustible and process sensors - yours, ours, theirs - without worrying about anybody's proprietary controller.

Will you have hundreds of sensors? Do you need an elaborate control scheme, or data acquisition with live and historical trending? Not a problem.

If you can describe it, we can do it.

Check out the standard features on Interscan's PLC Series Multipoint Gas Monitoring Systems

• Dedicated sensor, sample pump, and stainless steel rotameter for each point
• All control and display functions at easy-to-use operator interface
• User adjustable low and high alarm set points, activating dedicated relays for each monitoring channel
• Stackable tower lights for low, high, and fault alarms, and piezoelectric horn for high alarm, common to all channels
• Alarm event and time of occurrence tracking, plus last time calibrated tracking, specific for each sensor
• Vacuum fault detection and fault display, for all sample pumps
• 4-20 mA analog output, for each channel

Ordering Information:
PLC Series Multipoint Continuous Gas Monitoring Systems
Click here for our two point systems      Click here for multipoint sequential systems

Determine the desired number of points for the model number prefix, and the desired range for the model number suffix.

For example, a four point CO system, with range 0-199.9 ppm, would be PLC414-199.9m

  † These are the new model numbers. Certain other sources may not reflect this system, while the changeover is occurring. If in doubt, specify the gas and the measuring range desired.

  ¶ There is not a separate analyzer available for each of these compounds, and the sensor does not respond equally to all hydrazine species. The analyzer must be calibrated with the specific hydrazine compound of interest.

Analog or control output can be set to meet individual needs.  e.g. 4-20 mA could be specified to equal 0-100 PPM CO on the PLC(n)14.

Special ranges available on request—The panel meter can be factory programmed to display any desired full scale range, within the measuring capability of the instrument.

SQ Series Multipoint Sequential Gas Monitoring Systems

For many toxic gas detection applications—especially carbon monoxide monitoring in parking garages and tunnels—stream-switching or sequential monitoring of the many sample points is a cost-effective, safe, and viable approach. The SQ Series feature:

• PLC-based operation, with all user input and display at a color touchscreen, provided with a comprehensive help facility, and many logging functions
• Three user-adjustable alarm levels, activating dedicated contact closures
• Two 4-20mA outputs: One for the gas concentration, the other identifying the point currently being sampled
• Sample draw functionality via two heavy-duty diaphragm pumps. One draws the current sample, the other pulls "pre-sample" air into the system one point ahead of the sample point being monitored, thus providing fresh sample to the sensor at each sequential point advance.
• Flow sensor monitoring of each sample line—enabling flow rate display at the touchscreen and fault indication should a line encounter a flow restriction
• Auto-zero, with auto-calibrate an option
• Sample point dwell times individually adjustable, with point selection for continuous monitoring and removal from sequence selectable at the touchscreen
• Serial output from the PLC—ideal to input building management systems, for gas concentration-based ventilation control

Check out the SQ Series operations manual for detailed information and contact us for further specs and pricing.

System Photos

This is a five point sulfur dioxide monitoring system, sampling all points on a continuous basis, used in an industrial plant. Equipped with the features as mentioned above, this unit illustrates the typical appearance of our PLC Series Multipoint Monitoring Systems.

This is a custom-designed carbon monoxide monitoring system that sequentially samples eight points in a vehicular tunnel, with the object of ventilation control. Some of the features include automatic calibration, three levels of alarm individually settable for each point, sample point enable/bypass, sequence override, and a fully adjustable alarm delay/fan control package.

This is the panel of an eight point carbon monoxide monitoring system, sampling all points on a sequential basis, installed in a large underground parking garage.

 P.O. Box 2496 • Chatsworth, CA 91313-2496
 TOLL FREE: (800) 458-6153 (US & Canada) • PHONE: (818) 882-2331
 FAX: (818) 341-0642 • E-MAIL: info@gasdetection.com