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
| Output Type | Qualitative |
|---|---|
| Sampling Frequency | Continuous |
| Operating Principle | Float switch |
Test Results
| 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 |
| 924 LS | 0.7387 | 0.9397 | 0.7229 | 0.9080 | 0.6449 | 0.8155 | 0.7270 | 0.9335 |
| 925 Multi-Level | ||||||||
| Lower level Bottom float |
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.
570 East 7th Street
Dubuque, IA 52001
Tel: (563)583-5701
URL: www.morbros.com - Evaluator: Ken Wilcox Associates, Inc.
1125 Valley Ridge Dr.
Grain Valley, MO 64029
Tel: (816) 443-2494 Date of Evaluation: 09/30/15
URL: www.kwaleak.com
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