ML19242D817
| ML19242D817 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/12/1979 |
| From: | Gruensfellder K KF INDUSTRIES, INC. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19242D816 | List: |
| References | |
| NUDOCS 7908210253 | |
| Download: ML19242D817 (3) | |
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j KF INDUSTRIES, INC. El 230 WEST DAUPHIN STREET El FHILADELPHIA, PA.19133 ]
4/12/79 Dr. Harold Denton Nuclear Fegulating Commission Wachington D.C.
Dear Dr. Denton:
According to newspaper accounts the recent incident caused 250,000 gallons of water to flood the containment building, before appropiate action was taken.
For many years we have manufactured a simple and inexpensive device to detect the presence, or absence, of water.
I know you are probably inundated with similar letters from manufacturers.
It is not my purpose to waste your time. I just thought I would enclose a catalog sheet describing the product.
There are probably a number of applications in aheactor installation where the absence or presence of water are of signal importance.
Very truly yours,
//
Kurt Gruens felder, P.E.
gk eri gan O s'. J LVI 7908210 2 5 3
- zzee, TWX 710 670-0692 (215) 425-7710
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SOLID STATE ELECTR0XIC WATER SEX 80RS & ACCESSORIES i
l Will detect presence or absence of most any conductive liquid, simply and at very low cost.
. For industrial processes using water tanks C
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. Air conditioning condensate monitoring c
. Sump pumps. Washing machines. Wells. Flood Control the rear of the sensor, Or most any control or monitoring piebiem BIw re listed specifications which are common to all sen-dealing with water or water based liquids.
sors manufactured. Individual characteristics are then described for each device.
This series of sensors and related quipment has been designed
. Size: 7/8" dia. x 2-3/4" long.
to economically sense the presence or absence of water or
. Current thru prcbes: See description for each sensor.
water based liquids.
The suged construction of the sensor means reliable perfor-
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mance.
. Max. output current: See description for each sensor.
They can be mounted with clamps or they can be cemented in
. Sensor material: Anodized aluminum, filled with epoxy.
piace.
. Probe material: Tinned brass.
Each sensor is constructed in a cylindrical aluminum container
. Temperature limit: 16(TF.
which is then filled with epoxy. Two probes extend from the
. Cable: 20 ft. of twin cable, each stranded =24 AWG, sensor. Twenty feet of two wire cable are molded right into PVC insulated.
M0 DE L S-1.
This sensor will r'. lose a circuit upon contact with water. The lowest cost sensor in the line, it will deliver half-wave pulses. it should therefore only be used where this
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waveshape can be handled. A good load for this device is a relay with a coil,10 VA
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max., with a 100 MF 0 capacitor across it (watch polarity).
r-4 An AC buzzer or bell rated at 24V can be used as an afa m indicator, or our a! arm
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, p.m unit (=200.1) already has a transformer within its enclosure. This is described M
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- #39 Indicator lights should be rated between 12V and 18V for good brightness.
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[" 3 SPECIFICATIONS: S-1 SENSOR.
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Current thru sensing probes: 700 micrcamps peak 200 mictcamps avg.
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men gg Output current: 1/2 wave,.5A RMS max. - continuous
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Sensitivity: 500,000 ohms maximum will cause output current flow A%$
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M O D E L =S-2. ~
g This sensor acts like the preceding =S-1. It will close a circuit when the probes (y ~ ~
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"""'G contact water. Honever, it has several distinct properties.
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- 2. The current capability is larcer, m;,g
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- 3. The everage current flowing in the probe circuit thru the water is essentia!!y zeio.
The last feature is important if the unit is used iri, say, the food or beverage
,~k 6Esm industry. Unbalanced currents cause electrolysis which may affect the taste of the f
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IN pro du ct.
If the device is used in an application where it is always immersed in water, then,
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again, ciectrolytic corrosion becomes important, since it eats away the probe ends.
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For instance,if it were desired to monitor a storage tank and to keep it always full
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of water, then in this application the probe ends would be constantly immersed.
i__j _ _! ! _ _,l The model -S 2 device would satisf actority perf orm in this service.
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SPEC lFICATIONS: S-2 SENSOR.
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Current thru sensing probes: 100 micrcamps peak 1 microamps avg.
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d iV' Output current: Sine wave,1.5 amps RMS max. - continuous Sensitivity: 500 "O ohms maximum will cause output current flow.
I f.10 D E L =S-4 3
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This sensor is of the ' inverting" type. It will close a circuit in the ahmnce of water. !
c Conversely,it wit! open 9e circuit wnen the probes contact water.
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O This sensor has many applications where the loss of water should, say, scund an !
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afarm, open a water valve or other simiiar functions. The output of this device is ;
~p standard AC. Since it is a balanced sensor :he onrrent that flows in the probe tips !
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- v. hen immersed in water is exceedingly small.
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SPEClflC ATIONS: 54 SENSOR
[I Current thru sensing probes: 100 micrcamps peak 1 micrcamps avg.
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Output current (probes out of water): Sine wave 1 amp Rf.1S max. - contmucus j
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........-.s P.. t current flowing thru locd when proves are in water:.024 amps max. (See.
l oo cquivatent circuit)
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ACCESSORIES FOR WMER sells 0RS
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The water sensors as described in this ha!'a:in are completcly scif contained c!cctronic " water switches."
hm However, some uters may find the following ac%orias make it even simpler to use these sensors.
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f.10 DEL a200.1 ALARf.1 AND POWER UNIT
. 4" x 2 1/_
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wide x 21/4" high r ~
-~% 4 d Th.is mstrument contains &e necessary step-down transformer and a loud AC
,.9y,v3 1 lb.
g buzzer housed in cn attractive compact nutal case. A two-screw terminal board is
]"' #@ k/3 mounted on the enclosure. The sensar wires are connected to this board and you 115V AC rf 23 now have an inexpensive water alarm unit.
60 Cycles 23 into water.
84 DB at 5 feet F##. M[%
If used with sensor vS-1 and FS 2 the horn will sound when the senser is immersed
. Sound Output g]E
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if ustd with the S4 model atarm wi!! sound when no water is present.
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f10 DEL =300 CONTROLLER.
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,.i Y d This instrument contains a 115V step-down transformer which supplies the neces
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sary 24V aad a relay with a normatly open set of contacts, rated at 8 Amps 250 Vac.
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[f, The device can be used either with our S 2 or our S4 " inverted" sensor. (Cannot bef ![
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csed with S-1 sensor).
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<}.T~Q;f j.[ 7 Instrument is mounted onto a 4" round cover to fit a std. four inch round electrical i
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- ~ d box. 6" pigtails extend thru an opening in the cover to make connections.
-..i Some exampfes of uses are listed below:
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Let us say an auxiliary pump must be started when the water level reaches a maximum levelin a tank.
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Use the S-2 sensor.When the level reaches the probe tips the relay is energized and the pump starts.
For another exampfe,!ct us say that efectric heaters may not go on until the vesselis filled with water. Relay will only close when water reaches S-2 probe tips.
The " inverted" sensor S4 has just as many uses. Here the relay closes when the.e is no water - to start a large pump, to sound an darm, to operate a valve.
The above are, of ccurse, only i!!ustrative.
Whencver the premnce or abmnce of water must be kncwn the devices described in this brochure can fulfi!! the function cco n o mic2!'y.
MANUFACTURED BY qg7 n
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m (215) GA 5-7710 230 W. DAUPHIN STREET. Phi!ade!phia, Pa 19133 F
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TWX 710 67a CG92 WS 2 9/72