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VISIT OUR WEBSITE: www.ktekcorp.com • e-mail: sales@ktekcorp.com

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TYPICAL LEVEL APPLICATIONS FOR THERMAL DISPERSION SWITCHES

Thermal Dispersion switches are well suited todetect interface of air / liquid, liquid / liquid, air / foam, emulsion layers or liquid / solid orgranular solids. This example illustrates theThermal Dispersion switches being used to detect the oil layer in an oil / water separator.A second switch is used to detect the rise of the sand layer in the separator.

Thermal Dispersion switches are capableof handling temperatures up to 900°F(482°C) and pressures up to 10,000 PSIG(690bar). The ability to function underthe harshest conditions make it an idealselection in high temperature and / orhigh pressure tanks where other technologies are limited.

Additional advantages to Thermal Dispersion level switches is the ability to operate in viscous, hot fluids such as crude oil ormolasses. Slurries with high particulate content and sump level detection areadditional applications ideally suited for Thermal Dispersion technology.

OIL

s LOW LEVEL

s HIGHLEVEL

WATER

SAND

t HIGH-HIGHLEVEL

THEORY OF OPERATIONThe sensor head employs two temperature sensors with a constant low

power heating source physically attached to one of the sensors (see Fig. 1).This creates a temperature differential (ssT) between sensors which variesdepending on the surrounding product’s ability to disperse heat. The amountof heat dispersed is relative to the product’s thermal conductivity and thereforecan detect liquid interfaces and flow rate changes that other technologies cannot differentiate. Compensation for process temperature changes is made automatically and does not affect calibration.

The Thermal Dispersion switch electronics offer the latest technology including constant current sensor/heaterexcitation, precision signal amplification and highly reliable and repeatable switch point operation. Field calibration is accomplished by simply adjusting a potentiometer to the desired set-point.

(ssT) = SENSOR 1MINUS SENSOR 2

TEMPERATURE SENSOR 2HEATER

TEMPERATURE SENSOR 1

SENSOR OUTPUT VS. PRODUCT TYPE

AIR FOAM SOLIDS INLIQUID

HYDROCARBONORGANIC

EMULSIONLAYER

WATER

100% -

75% -

50% -

25% -

0% -

FIELD ADJUSTABLE

SET-POINT

WORLD INNOVATOROF SWITCH TECHNOLOGY

Doc. No.: CBR-0006-1 Rev NC (06-2006)

TYPICAL FLOW APPLICATIONS FOR THERMAL DISPERSION SWITCHES

• Pump Protection — Automatic shut-off on low/no flow

• Bearing Lubrication — Detects loss of lubricant flow

• Seal Leakage — Verifies positive seal flow or detectsexcessive leakage indicating maintenance required

• Energy Management — Pump shut-off on loss ofproduct to conserve energy

• Chemical Feed — Indicates low/no flow of chemicaladditives to process

• Metering Pumps — Senses loss of product flowavoiding incorrect measurement

• Control Rooms — Verifies flow when pumps orvalves are energized

• Purge Air — Detects loss of flow for process orPlant safety

• Safety Shower — Indicates Safety Shower useand potential danger to Plant personnel

• Analyzer/Gas Chromatograph — Provescontinuous sample flow to instruments

• Spray Nozzles — Detects nozzle blockage in paintor paper coating equipment

• Relief Valve/Rupture Disc — Alarms on flowor leakage of valve or rupture discs

FLOW VERIFICATION /INDICATION

PUMP RELATED APPLICATIONS

MISCELLANEOUSAPPLICATIONS

Optional Configurations:• REMOTE MOUNTING

The electronics can be remotemounted in applications wherehigh temperature, high vibration, or access to switchpoint adjustment is needed.Distances up to 2000’ can be specified.

• EXTENDED SENSORFor larger line sizes the TX, TQ or TS user can specify a custom insertion length to any dimension, placement of the sensor 1/3 of the way into the line is ideal in most applications.

• DUAL SWITCHBOARD OPTIONAll Thermal Dispersion seriesswitches can be configured, withan additional board, to function asa window comparator. The switchcan detect between two differentflow rates, two different tempera-tures, flow rate and temperature,or can monitor for a combinationof temperature and level.

• FLANGE MOUNTINGThis option is available on theTX and TQ Series in many different sizes, ratings and faceconfigurations. The sensorinsertion length is custom specified by the user.

• HIGH FLOW OPTIONBy placing a shroud over thesensor head, the desired set-point of the instrument isextended to higher flow rates.This option is recommended inclean liquids and gases.

Process Capabilities:• Full Vacuum to 10,000 PSIG (690bar)• -320 to 900°F / -195 to 482°C• Any Dielectric• Any Specific Gravity

K-TEK THERMAL DISPERSION SWITCHES FOR FLOW / LEVEL / TEMPERATURE APPLICATIONS

• One Switch for Gas or Liquid Flow, Liquid Level, Interface Level, Temperature, or Granular Solids

• No moving parts• Type 316L Stainless Steel, welded (std)• Explosion-proof• Exotic alloys for corrosive applications• Temperature Range -320°F to +900°F / -195°C to 482°C• Pressures to 10,000 PSIG / 690bar

Our standard flow/level/temperature switches are the most durable instruments available. They are ideally suited for detecting the increase or decrease in flow or level of virtually all liquids, gases, slurries and granular solids. The “no moving parts” principle of operation offers extremely reliable and repeatable operation with no vanes or linkage to stick, and no paddles to break off. This series of flow switches offers simple, reliable, and cost effective operation in the most severe industrial applications.

A wide selection of threaded and flanged process connections is available and probe length can bemade to customer specified length. Numerous circuit board options are available.

TX SERIES - STANDARD FLOW / LEVEL / TEMPERATURE SWITCH

TQ SERIES - FAST RESPONSE FLOW / LEVEL / TEMPERATURE SWITCH• One Switch for Gas or Liquid Flow, Liquid Level, Interface Level,

Temperature, or Granular Solids• No moving parts• Response time from 1 second• Type 316L Stainless Steel• Temperature Range -50°F to +350°F / -45°C to 117°C• Pressures to 2000 PSIG / 138bar• Explosion-proof

These fast response flow/level/temperature switches are used when the response time indetecting the increase or decrease of flow or level is critical. With no moving parts exposed to the process they will provide extremely reliable and repeatable operation in virtually all liquids, gases, slurries, and granular solids.

The QX Series has a wide selection of threadedand flanged process connections with customer selectable probe length. The varied electronic circuitboard options offer the user a wide selection of power inputs and relay outputs.

• One Switch for Gas or Liquid Flow, Liquid Level, Interface Level, Temperature, or Granular Solids

• Designed to 3A requirements• Type 316L Stainless Steel, welded (std)• Temperature Range -50°F to +350°F / -45°C to 117°C• Pressures to 500 PSIG / 34.5bar• Simple, reliable, cost effective

The TS Series flow/level/temperature switch is designed to provide reliable detection in the food and pharmaceutical industries. These highly polished instruments, featuring quick disconnect fittings, can be used to detect the increases or decreases of flow, level or temperature in virtually all liquids, gases, slurries and granular solids.

TS SERIES - SANITARY FLOW / LEVEL / TEMPERATURE SWITCH

INSTRUMENT RANGEABILITY: TX, TS & TQ SERIES

0 .05 .1 .5 1.0 5.0 10 50 100 500

Set-Point Range Set-Point Range (TX, TQ)Standard High Flow (HF-Option)

Flow RateF.P.S. (Feet per Second)

WATER/

AQUEOUS

HYDROCARBON/

ORGANIC

AIR/GAS

VOLUMETRIC (G.P.M. OR C.F.M.) TO VELOCITY (F.P.S.)CONVERSIONTABLELINE SIZE

LiquidMultiplier

Gas Multiplier

1/8”

5.65

42.19

1/4”

3.08

23.06

3/8”

1.68

12.57

1/2”

1.06

7.909

3/4”

0.602

4.5

1”

0.371

2.776

1-1/4”

0.215

1.61

1-1/2”

0.158

1.18

LINE SIZE

LiquidMultiplier

Gas Multiplier

10”

0.00407

0.0304

12”

0.00287

0.0209

14”

0.00237

0.0177

16”

0.001815

0.0136

18”

0.001434

0.0107

20”

0.001154

0.00863

24”

0.000798

0.00597

LINE SIZE

LiquidMultiplier

Gas Multiplier

2”

0.0956

0.7161

2-1/2”

0.067

0.519

3”

0.0434

0.3248

3-1/2”

0.0325

0.2427

4”

0.0252

0.1884

5”

0.016

0.12

6”

0.0111

0.083

8”

0.006

0.048

IX SERIESIN-LINE FLOW / TEMPERATURE

SWITCH

• Response time from 1 second• 316L Stainless Steel, (std), wetted parts• Explosion proof• Pressures to 10,000 PSIG / 690bar• Temperature Range

50°F to +350°F / -46°C to 177°C

The IX Series is ideally suited for applications such aschemical injection, cooling lines, sampling lines, lubrication and other smaller flow rate situations.

IM SERIESLOW-COST IN LINE FLOW /

TEMPERATURE SWITCH

EXAMPLES:Example 1: 100 CFM in 4” line = 100 x .1884 = 18.84 F.P.S.Example 2: 10 G.P.M. in 3” line = 10 x .0434 = .434 F.P.S.

Test Conditions: 60°F, 14.7PSIA, SCH. 40 LINE

CONVERSION CHART TO cc / sec or ml / secFrom:

Gal. / Min.

Gal. / Hr.

Gal. / Day

L / Min.

Multiply by:

63.1

1.05

0.0438

16.7

From:

L / Hr.

L / Day

Ft3 / Min.

M3 / Hr.

Multiply by:

.278

0.0116

472.0

278.0

INSTRUMENT RANGEABILITY: IX & IM SERIES

.01 0.1 1.0 10 100 1,000 10,000

Range Tube #1IX / 1875

Range Tube #2IX / 2575

IX / 7575 IM / 2525

WATER

OIL

AIR

• Response time from 1 second• 316L Stainless Steel, (std), wetted parts• Explosion proof enclosure optional• Pressures to 4,000 PSIG / 276bar• Temperature Range

-50°F to +350°F / -45°C to 117°C)

• Chiller Protection — Automatically turns off chiller at noflow to prevent compressor failure due to slugging

• Heater Burn-out Prevention — Heater shut-down onloss of flow to prevent overheating elements

• Tank Car Loading — Senses dry line or phase change fromliquid to nitrogen gas flow

• Drain Line Sensor — Capable of detecting flow in partiallyfilled lines

• Energy Management — Turns off pumps, heaters,chillers, heat exchanger on loss of flow

• Agitation Monitor — Positive indication of agitation in vessels

The TX, TQ, and TSSwitches are FieldSelectable for:• Gas Flow• Liquid Flow• Temperature • Liquid Level

- Adjustable for:Total LevelInterface LevelFoam LevelLiquid Solid Interface

• Solids Level

Available Materials:• 316 / 316L SS• Alloy 20• Hastelloy C-276• Titanium• Mechanical or

electro-polished 316 SS for sanitary & high purityservice

• Other materials:- Consult factory

Industries:• Petrochemical• Oil and Gas• Power Utilities• Pharmaceutical• Food and Beverage• Ships / Marine• Biotechnology

Flow Ratecc / sec or ml / sec

ASME

CSA

Factory Mutual System

CENELEC

ISO 9001REGISTERED FIRM

PEDCERTIFIED

ATEX Certified