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State Water Resources Control Board <br />Dual Stage Hydrostatic Sensor 30% by weight <br />794380-303 calcium chloride in water <br />hicah*** low*** <br />Product activation height (in) 13.13 1.20 <br />Response time (min) <1 <1 <br />Recovery time (min) <1 <1 <br />**Evaluation performed by Carnegie Mellon Institute. <br />***The "high" and "low" refer to high and low level alarm points of dual stage hydrostatic sensors. <br />Page 2 of 3 <br />Comments: <br />EMC Series and EMC Basic controllers have been evaluated only for use with sensors 794380-301 and 794380-303. <br />Evaluator reports that sensors will respond to any liquid after their thresholds are exceeded. <br />Response times measured from trigger point, except for sensor 794380-301 with 50% by weight ethylene glycol in water, where response time also included time <br />for liquid level to rise from bottom of a test cylinder to trigger point. <br />Evaluator reports sensors can easily be removed, cleaned, and reinstalled after an alarm was triggered or for periodic testing. <br />Sensors are reusable. <br />Comparison of TLS -450 with TLS -350 series console showed comparable results when evaluated with representative sensors. <br />**Dual Stage Hydrostatic Sensor 794380-302 was replaced by Sensor 794380-303 and is not supported by TLS -450 series console. <br />Single Stage Hydrostatic Sensor 794380-301: <br />Intended to monitor level of either ethylene glycol or calcium chloride solutions in interstitial or annular space of a double -walled tank. <br />If the brine level in the reservoir drops below the threshold of the sensor, an alarm condition is generated. <br />The evaluation using 30% by weight calcium chloride in water was reevaluated using a different approved test protocol. <br />Dual Stage Hydrostatic Sensor 794380-302: <br />Alarm is activated if any significant gain or loss of solution occurs. <br />Dual stage hydrostatic sensor 794380-303 has replaced this sensor and is fully interchangeable with this sensor. <br />Vendor will discontinue production of this sensor as of December 31, 2003. <br />U <br />Dual Stage Hydrostatic Sensor 794380-303: <br />If brine level in reservoir drops below the threshold of low-level sensor or if any liquid rises above the threshold of high level sensor, an alarm condition is <br />generated. <br />Alarms are indicated by an audible alarm, displayed message on the console, printed message (if the console is equipped with a printer), and recorded as partof <br />the console "Alarm History Report." <br />Veeder-Root <br />125 Powder Forest Dr. Evaluator: Carnegie Mellon Research Institute <br />Simsbury, CT 06070-2003 Tel: (412) 268-3495 <br />Tel: (860) 651-2700 Dates of Evaluation: 12/07/92, 03/16/98 <br />E-mail: dhalla@veeder.com Evaluator: Ken Wilcox Associates <br />URL: wwwveeder.com/dynamic/index.cfm Tel: (816) 443-2494 <br />http://www.waterboards.ca.gov/water—issues/programs/ust/leak Drevention/lgl l3/vendors/veederroot_q.shtml 7/6/2010 <br />