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Issue
Date: March 31, 2016
Morrison Bros. Co.
924LS, 924 and 925 Sensor
for use with the 918AC, 918S, 918D and 918Q Alarm Console
INTERSTITIAL DETECTOR (LIQUID-PHASE)
Detector:
Test Results:
Threshold Levels (in) |
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unleaded gasoline |
diesel |
water |
unleaded E85 |
Sensor and Float
Type |
*NC |
**NO |
NC |
NO |
NC |
NO |
NC |
NO |
924 Adjustable |
2.2428 |
2.5585 |
2.1886 |
2.5118 |
2.0205 |
2.3403 |
2.2419 |
2.5578 |
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924 LS |
0.7387 |
0.9397 |
0.7229 |
0.9080 |
0.6449 |
0.8155 |
0.7270 |
0.9335 |
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925 Multi-Level |
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Lower level
Bottom float
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2.8385 |
2.5141 |
2.7765 |
2.4515 |
2.5872 |
2.2654 |
2.8126 |
2.4986 |
Low Level
Top float |
4.9891 |
5.3068 |
4.9346 |
5.2676 |
4.7808 |
5.0780 |
4.9636 |
5.2793 |
High level
Bottom float |
53.0901 |
53.3855 |
52.9956 |
53.3214 |
52.7580 |
53.0631 |
53.0349 |
53.3488 |
High level
Top float |
55.5567 |
55.8861 |
55.4769 |
55.8120 |
55.2351 |
55.5612 |
55.5133 |
55.8479 |
*NC - normally closed; **NO - normally open
The following detection times and fall times apply to each sensor:
Detection time = <5 seconds
Fall time = <5 seconds after liquid level is within threshold of sensor
Specificity Results:
This evaluation determined the sensor's 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 sensor threshold is exceeded. Responses to these fuels were not determined, but would be expected to be very similar to the diesel responses.
Comments:
Alarm is audible and visual. Sensors are reusable.
The 924 (adjustable level sensor) is available in four lengths with a magnetic, cylindrical, stainless steel float on a brass or stainless steel stem.
The 924LS (interstitial sensor/level sensor) has a magnetic, cylindrical, Nitrophyl float, stainless steel shroud, and Teflon coated wires.
The 925 (multi-level sensor) is available with one to five magnetic, cylindrical, stainless steel floats on a brass or stainless steel stem ordered to custom specified lengths and level set points.
The time for a liquid level sensor to alarm will depend on the size and geometry of the area in which it is installed and the rate of leakage into this space. The time to alarm can be calculated by dividing the volume necessary to reach the threshold by the leak rate.
Morrison Bros. Co.
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Evaluator: Ken Wilcox Associates, Inc.
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570 East 7th Street
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1125 Valley Ridge Dr.
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Dubuque, IA 52001
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Grain Valley, MO 64029 |
Tel: (563)583-5701
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Tel: (816) 443-2494
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Web: www.morbros.com |
Dates of Evaluations: 09/30/15 |
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Web: www.kwaleak.com |
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