Chemical Injection TechnologiesProduct/Specification Bulletin

Specification VAS-1 Rev: 11042010

SUPERIOR™ Model VAS-1, VAS-2Chlorine Vacuum Alarm Switch

GENERAL DESCRIPTION

The SUPERIOR™ Series VAS chlorine vacuum alarm switches are designed to alert gas chlorinator users when either of twocritical situations arise:

1. HIGH VACUUM ALARM - indicatesthat the supply of chlorine gas has beeninterrupted. Either the chlorine supplyis empty, or the chlorine cylinder valvehas been shut off. In either case thereis no chlorine gas entering the system.

2. LOW VACUUM ALARM - indicates thatthe ejector is not producing sufficientvacuum to operate the system, or a leakhas occurred somewhere in the system.

Either of these situations will indicatethat your system is not beingchlorinated. The VAS alarm switch canbe connected to a number of standarddevices that will sound a loud audiblealarm, send a signal via telephone lines,stop pumps or close valves, or anycombination of these devices.

It is very important that operationspersonnel have a quick, reliablemonitoring device to tell them if thecritical chlorinating process has beeninterrupted. Many states now requirevacuum level monitoring devices on allpublic water supply gas chlorinationsystems. The SUPERIOR™ Series VASvacuum alarm switches meet or surpassthese requirements.

Series VAS alarm switches are availablewith either latching or non-latchingalarm relays. The latching type requiresmanual reset before alarm is cancelled.

P R I N C I P L E O FOPERATION

Gas chlorinators operate within a rangeof vacuum levels. The vacuum is produced by a wateroperated venturi (the ejector). When sufficient vacuum ispresent, a spring-opposed diaphragm in the vacuumregulator, pushes the inlet valve open and allows gas to flowinto the system. The flow rate of chlorine is regulated by anadjustable valve. In a standard chlorine system the VASswitch is located between the flow rate valve and theejector.(See typical installation)

The vacuum level in this area will always be higher than in thevacuum regulator because of the restriction of the rate valve. Since the regulator opens at approx. 4 inches of vacuum, this "monitored" area will always be above 5 inches when thesystem is operating. Therefore, the Low vacuum switch ispreset at 5 inches of vacuum. If the ejector becomes plugged,

the water supply is shut off, or a breakoccurs in the vacuum tubing, thevacuum level will fall below 5 inches andan alarm contact will be made.

Under normal operating conditions theejector will produce approximately 27inches of vacuum, if there is no chlorineflowing through the system. Whenchlorine gas flows through the regulatorand rate valve, the vacuum level willalways be below this "shutoff" point. Therefore the VAS high vacuum switchis preset at 25 inches of vacuum. If thechlorine supply is emptied or the valveis shut off, vacuum will rise to the"shutoff" level and an alarm contact willbe made. In some installations, theejector hydraulic conditions may not allow "shutoff' vacuum to reach theselevels. In such cases the alarm setpoints can be easily adjusted on-site tooperate within the limits of the system.

Both switches are time delayed toeliminate false alarms which may resultfrom vacuum spikes or delays whichcan occur, particularly when theoperation of the chlorinator is controlledby the on / off cycling of a boosterpump. The time delay can be manuallyset from 0 to 60 seconds.

The unit is housed in a NEMA 4X U.L.listed fiberglass enclosure, and can bemounted outdoors. An oil-filledchemical gauge protector acts as abarrier between the chlorine gas and theswitch mechanism.

MODELS

! VAS-1 non latching

! VAS-2 latching (manual reset)

! ALM-1 remote alarm horn and light (optional)

Pub: VAS-1, Rev: 11042010 Copyright© 1994, Chemical Injection Technologies, Inc. Printed in U.S.A.

DIMENSIONS SPECIFICATIONS

Enclosure: fiberglass NEMA 4X

Power: 115VAC, 60 Hz

Switches: N/O low vacuum; N/C high vacuum;adjustable vacuum levels; adjustable time delay(0-60 seconds); single pole, double throw, 5amp, 120 Vac, 60 Hz.

Contacts: 1 set - dry, telephone (dialer)1 set - remote alarm1 set - switch auxiliary; requires customerfurnished dry contacts which slave on start orstop of chlorine booster pump, or otherequipment used to create vacuum. ____________________________________________

Chemical Injection Technologies, Inc.835 Edwards Road, Ft. Pierce, FL, 34982, USATel:(772) 461-0666 Fax: (772) 460-1847

E-Mail: Superior@chlorinators.comwww.chlorinators.com

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