Issue Date: November 22, 1995
Revision Date: August 8, 2017

Veeder-Root

ILS-250, ILS-350, TLS-250i, 250i Plus, 300, 300C, 300i, 300PC, TLS-350 Series, TLS-450 Series, TLS-4 8601 Series, Red Jacket ProMax and ProPlus with Interstitial Liquid Sensor for Fiberglass Tanks 794390-401, 404, 407, 409, Interstitial Liquid Sensor for Steel Tanks 794390-420, 460, Liquid Sensor for Sumps 794390-206

Interstitial Detector (Liquid-Phase)

Detector

Output Type Qualitative
Sampling Frequency Continuous
Operating Principle Float switch

Test Results

Interstitial Liquid Sensor for Fiberglass Tanks 794390-401, 404, 407, 409

  Unleaded Gasoline* Synthetic Gasoline** Used Oil**
Response time (min) 3.66 3.45 N/D****
Recovery time (min) <1 <1 N/D****
Product activation height (cm) 1.28 1.27 N/D****
Lower detection limit (cm) 1.84 1.65 N/D****

Interstitial Liquid Sensor for Steel Tanks 794390-420*****, 460*****

  Unleaded Gasoline* Synthetic Gasoline** Used Oil**
Response time (min) 6.00 6.51 <1
Recovery time (min) <1 <1 <1
Product activation height (cm) 3.67 3.62 N/D****
Lower detection limit (cm) 4.05 4.17 2.65

Liquid Sensor for Sumps 794390-206 ***

  Unleaded Gasoline* Synthetic Gasoline** Used Oil**
Response time (min) 8.19 8.49 N/D****
Recovery time (min) <1 <1 N/D****
Product activation height (cm) 4.12 3.95 N/D****
Lower detection limit (cm) 4.67 4.36 N/D****

TLS-4 8601 Series
(The TLS-4 8601 Series consists of the following derivatives: TLS-4, TLS-4B, TLS-4c, TLS-4i, and TLS-S1 consoles.)

Interstitial Liquid Sensor for Fiberglass Tanks 794390-401, 404, 407, 409

  Unleaded Gasoline Diesel* Water E85
Threshold Level (inches) 1.19 1.35 1.3823 ******
Detection Time (minute) <1 <1 <1 ******
Fall Time (minute) <1 <1 <1 ******

*ILS-250, TLS-250i, 250i Plus

**ILS-350, TLS-350 Series

***Liquid Sensor for Sumps 794390-206 is no longer manufactured and is not supported by the TLS-450 series console. It was replaced by sensor models 794380-208, 209 which are included on the NWGLDE list

****See Glossary

*****This sensor is identified as an interstitial sensor, but will function properly in other containment areas such as containment sumps, contained risers and other contained enclosures. This sensor must be installed at the lowest point of the containment enclosure to insure early detection of liquids.

******TLS-4 Series testing did not include testing with used oil. Evaluator expects comparable results from previous testing with other consoles listed.

Specificity Results

Activated: diesel, heating oil #2, water.
Evaluations determined these sensors' responses to the liquids shown above and those indicated in the following 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

Comparison of TLS-450 Series console with TLS-350 series console showed comparable results when evaluated with representative sensors in water and diesel fuel.

Sensors are reusable.
Veeder-Root has redesigned sensor model 794390-409. The cable length remains the same (284"). The original design of the sensor has mesh netting around the sensor. The new design does not have mesh netting around the sensor. The old sensor parameters are as shown above. The redesigned sensor is listed under Veeder Root 8601 Series, 8600 Series, and TLS-3xx Series with Interstitial Liquid Sensor for Fiberglass Tanks 794390-409 interstitial Detector (Liquid Phase).

The TLS-4 8601 Series consists of the following derivatives: TLS-4, TLS-4B, TLS-4c, TLS-4i, and TLS-S1 consoles.

  • Veeder-Root
    125 Powder Forest Dr.
    Simsbury, CT 06070-2003
    Tel: (860) 651-2700
    URL: www.veeder.com/us/
  • Evaluator: Carnegie Mellon Research Institute
    Tel: (412) 268-3495
    Date of Evaluation: 07/17/92, 04/22/98

  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Date of Evaluation: 08/05/10, 12/16/16

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