Issue Date: January 11, 2001
Revision Date: April 8, 2011

Containment Solutions, Inc.

(originally listed as Fluid Containment and O/C Tanks)

DDAS 910 Discriminating Sensor for Dry Annular Spaces;
DCBS 900 Discriminating Sensor for Collars, Bulkheads, Sumps

Interstitial Detector (Liquid-Phase)

Detector

Output Type Qualitative
Sampling Frequency Continuous
Operating Principle Capacitance change

Test Results

*California requires annual certification of all leak detection equipment. The certification of discriminating sensors should include functional testing of both water and product detection capabilities.

Model DDAS 910 and DCBS: Sensors can only respond to liquid directly in contact with the detection element, and are unable to detect a product release floating on an existing pool of water whose height exceeds the level of the detection element.

Discriminating Sensors Unleaded Gasoline Synthetic Gasoline
DDAS 910 (Dry Annular Spaces)
Accuracy (%) 100 100
Detection time (sec) <1 <1
Fall time (sec) Manual reset Manual reset
Lower detection limit (cm) 0.32 0.36
DCBS (Collars, Bulkheads, Sumps)
Accuracy (%) 100 100
Detection time (sec) <1 <1
Fall time (sec) Manual reset Manual reset
Lower detection limit (cm) 0.76 0.74

Specificity Results (in addition to above)

Activated: n-hexane, diesel, jet-A fuel, toluene, xylene(s), water.
Evaluations determined these sensors' responses to the liquids shown above as well as those indicated in this section. Biodiesel blends B6-B20 meeting ASTM D7467 and biodiesel B100 meeting ASTM D6751 would also produce an alarm if the sensor threshold is exceeded. Responses to these fuels were not determined, but would be expected to be very similar to the diesel responses.

Comments

Control panel models:
CPF 1, CPF 2, CPF 3, CPF 4 for liquid level sensors;
CPI 1D, CPI 1H, CPI 1N inventory control for liquid level sensors and 1 tank;
CPD 1, CPD 2, CPD 4 for discriminating liquid level sensors;
CPI 4 inventory control for liquid level sensors and up to 4 tanks;
BOMC battery operated control cap for liquid level sensors;
CCF 1DA battery operated control cap for dry annulus monitoring;
CCF 2 battery operated control cap for hydrostatic reservoir monitoring.

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