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:

Threshold Levels (in)        

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.

Evaluator:  Ken Wilcox Associates, Inc.

570 East 7th Street

1125 Valley Ridge Dr.

Dubuque, IA 52001

Grain Valley, MO 64029

Tel: (563) 583-5701

Tel: (816) 443-2494

Web: www.morbros.com Dates of Evaluations: 09/30/15
  Web: www.kwaleak.com
 

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