Click picture for more information on our budget-priced two point LD systems

For gas monitoring at three or more locations, we are proud to present Interscan’s exclusive Automation-BasedTM Continous Multipoint Gas Detection Systems  [link describes design philosophy].   Our multipoint continuous gas monitoring system product line is the talk of the industry, and has spawned many imitators.  Interscan’s is the original and still the best.

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

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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, digital, 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 digital flow switch 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

 

Options

  • Alternative packaging, including Type X or Type Z purged enclosures and RFI resistant enclosures
  • Enclosure heating and cooling
  • Triple alarm set points
  • Loss of power alarm
  • Aspirator (in lieu of pump)
  • Auto zero
  • Sensor protection circuit

 

Additional Specs

Measuring RangeResolution
0–2000 ppm1 ppm
0–1000 ppm1 ppm
0–500 ppm1 ppm
0–200.0 ppm0.1 ppm
0–100.0 ppm0.1 ppm
0–50.0 ppm0.1 ppm
0–20.0 ppm0.1 ppm
0–5.00 ppm0.01 ppm
0–2.00 ppm0.01 ppm
0–1.00 ppm0.01 ppm
NOTE: Not all measuring ranges are available for all gases. Please refer to specific ordering information, below.

Weight

  • 2-point system 70 lb (31.8 kg)
  • 3-point system 142 lb (64.4 kg)
  • 4-point system 148 lb (67.1 kg)
  • 5-point system 155 lb (70.3 kg)

Dimensions

2-point system:
22″ H x 18″ W x 8.5″ D
(610 x 508 x 203 mm)

3, 4, and 5-point systems:
36″ H x 30″ W x 8″ D
(914 x 762 x 203 mm)

Dimensions given are exclusive of alarm signals and enclosure mounting feet.

Specifications common to all Interscan gas detection instruments

 

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 0–200.0 ppm, would be PLC414-200.0m

GAS

Number of points

Model No. Prefix

Measuring
Range (ppm)

Model No. Suffix

Br2
bromine
three
four
five 
SRPLC370
SRPLC470
SRPLC570
0–20.0
0–5.00
–20.0m
–5.00m
CO
carbon monoxide
three
four
five 
SRPLC314
SRPLC414
SRPLC514
0–2000
0–200.0
0–100.0
0–50.0
–2000m
–200.0m
–100.0m
–50.0m
Cl2
chlorine
three
four
five 
SRPLC334
SRPLC434
SRPLC534
0–20.0
0–5.00
–20.0m
–5.00m
ClO2
chlorine dioxide
three
four
five 
SRPLC333
SRPLC433
SRPLC533
0–20.0
0–5.00
0–2.00
–20.0m
–5.00m
–2.00m
C2H4
ethylene
three
four
five 
SRPLC307
SRPLC407
SRPLC507
0–2000
0–200.0
0–20.0
0–5.00
–2000m
–200.0m
–20.0m
–5.00m
EtO
ethylene oxide
three
four
five 
SRPLC320
SRPLC420
SRPLC520
0–50.0
0–20.0
0–5.00
–50.0m
–20.0m
–5.00m
HCHO
formaldehyde
three
four
five 
SRPLC316
SRPLC416
SRPLC516
0–20.0
0–2.00
–20.0m
–2.00m
H2NNH2
CH3NHNH2
(CH3)2NNH2
hydrazine(s)¶
three
four
five 
SRPLC318
SRPLC418
SRPLC518
0–20.0
0–2.00
-20.0m
–2.00m
H2
hydrogen
three
four
five 
SRPLC302
SRPLC402
SRPLC502
0–2000
0–500
–2000m
–500m
HBr
hydrogen bromide
three
four
five 
SRPLC380
SRPLC480
SRPLC580
0–20.0
0–5.00
–20.0m
–5.00m
HCl
hydrogen chloride
three
four
five 
SRPLC336
SRPLC436
SRPLC536
0–20.0
0–5.00
–20.0m
–5.00m
HCN
hydrogen cyanide
three
four
five 
SRPLC328
SRPLC428
SRPLC528
0–50.0
0–20.0
0–5.00
–50.0m
–20.0m
–5.00m
H2O2
hydrogen peroxide
three
four
five 
SRPLC309
SRPLC409
SRPLC509
0–1000
0–200.0
0–50.0
0–5.00
–1000.0m
–200.0m
–50.0m
–5.00m
H2S
hydrogen sulfide
three
four
five 
SRPLC317
SRPLC417
SRPLC517
0–500
0–200.0
0–20.0
0–1.00
–500m
–200.0m
–20.0m
–1.00m
NO
nitric oxide
three
four
five 
SRPLC354
SRPLC454
SRPLC554
0–2000
0–200.0
0–20.0
0–5.00
–2000m
–200.0m
–20.0m
–5.00m
NO2
nitrogen dioxide

Also known as N2O4
nitrogen tetroxide
three
four
five 
SRPLC315
SRPLC415
SRPLC515
0–2000
0–200.0
0–20.0
0–5.00
–2000m
–200.0m
–20.0m
–5.00m
O3
ozone
three
four
five 
SRPLC348
SRPLC448
SRPLC548
0–50.0
0–20.0
0–5.00
–50.0m
–20.0m
–5.00m
PrO
propylene oxide
three
four
five 
SRPLC332
SRPLC432
SRPLC532
0–50.0
0–20.0
0–5.00
–50.0m
–20.0m
–5.00m
SO2
sulfur dioxide
three
four
five 
SRPLC324
SRPLC424
SRPLC524
0–200.0
0–50.0
0–20.0
0–5.00
–200.0m
–50.0m
–20.0m
–5.00

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.
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.
Although the above table only goes up to five point systems—for reasons of clarity and brevity—there is no limitation on the number of points available. Many larger systems have been supplied. Please contact us for further details.

 


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

Click picture for larger image

 

This is a four point (PLC Series) ethylene oxide monitoring system, sampling all points on a continuous basis, used in a healthcare sterile processing department.. Equipped with the features as mentioned above, this unit illustrates the typical appearance of our PLC Series Multipoint Monitoring Systems.

 

Click picture for larger image

 

 

 

 

 

 

This is a custom-designed carbon monoxide monitoring system (SQ Series) 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 (PLC Series), sampling all points on a sequential basis, installed in a large underground parking garage.

 

 

 

 

Click picture for larger image

 

This is a custom-designed 32-point continuous carbon monoxide monitoring system (PLC Series). The enclosure on the right with the touchscreen houses the sensors and control. The other enclosure contains the sample pumps and filters.

This system is dual purpose, monitoring employee exposure, as well as controlling ventilation—in conjunction with a building management system.

Arc-Max® data acquisition/archiving/reporting was also provided, along with a remote alarm annunciator.

Larger pictures and more views are available here.

More tech details are available here.

 

If you are thinking about a gas detection system, even in the preliminary stages of a project, contact us NOW!

 

We’ll put together the most cost-effective solution to your monitoring problem.