Issue Date: April 6, 2020

Integrated Control Systems

SD1-SP and SD1-DP Safety Disconnect Liquid Sensors




Output Type: qualitative
Sampling Frequency: continuous

Operating principle:

magnetic reed float switch


Test Results:


unleaded gasoline






SD1-SP and SD1-DP

Detection time (min)




Fall time (min)




Threshold Level (in)





*Evaluations determined these sensors' responses to the liquids shown above. Biodiesel blends B6-B20 meeting ASTM D7467 and biodiesel B100 meeting ASTM D6751 would also produce an alarm if the lower detection limit is exceeded. Responses to these fuels were not determined but would be expected to be very similar to the diesel responses



The SD1-SP and SD1-DP sensors are identical with one exception. The one exception is the SD1-SP has one relay module and one set of contacts and the SD1-DP has two relay modules and two sets of contacts.
These sensors use chemical resistant 304 stainless steel float switch housing.
An integrated reset switch allows the service technician to reset these sensors after correction of a fault condition. These sensors can also be reset by cycling power for a duration of 10 or more seconds.
If liquid rises above the threshold level of these sensors, power load to the pump or dispenser is disconnected and an alarm condition is generated.



Integrated Control Systems

Evaluator:  Ken Wilcox Associates , Inc.

1425 American Way

1125 Valley Ridge Dr.

Cedar Hill, TX 75104

Grain Valley, MO 64029

Tel: (972) 291-6064

Tel:  (816) 443-2494


Dates of Evaluations:  03/08/19




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