Kobold KAL-D Specifications

Compact Thermal Flow Switch

for Water-Based Liquids

measuring

•

monitoring

•

analyzing

KAL-D

● No Moving Parts

● Switching Range 0.15...6.6 Ft/Sec.

● Max. Pressure 580 PSIG

● Max. Operating Temperature 176 °F

● Clean-In-Place to 250 °F

KOBOLD companies worldwide:

ARGENTINA, AUSTRALIA, AUSTRIA, BELGIUM, BULGARIA, CANADA, CHILE, CHINA, COLOMBIA,
CZECH REPUBLIC, EGYPT, FRANCE, GERMANY, HUNGARY, INDIA, INDONESIA, ITALY, MALAYSIA,
MEXICO, NETHERLANDS, PERU, POLAND, REPUBLIC OF KOREA, ROMANIA, SINGAPORE, SPAIN,
SWITZERLAND, TAIWAN, THAILAND, TUNISIA, TURKEY, UNITED KINGDOM, USA, VIETNAM

05/07-15- 2019

KOBOLD Instruments, Inc.
1801 Parkway View Drive
Pittsburgh, PA 15205

Main Ofce:

1.800.998.1020

1.412.788.4890
[e-mail]
www.koboldusa.com

Compact Thermal Flow Switch Model KAL-D

Description

The KAL-D series combines the features of our legendary KAL-K
thermal flow switch with a compact size. The KAL-D uses the
calorimetric principle to monitor the flowrate of non-viscous
water-based liquids. The sensor tip is heated to a few degrees
above the liquid temperature. As the liquid flows across the tip,
it is cooled by the liquid. The amount of cooling is proportional
to liquid velocity. The liquid velocity is compared to the setpoint
which is field-adjustable by the user. A transistor switch is
activated when the flow setpoint is reached. The KAL-D series
has a smooth measuring probe with no moving parts making
it exceptionally reliable and insensitive to dirt and solids. The
insertion type probe allows for flow monitoring with minimal
system pressure loss.

Microprocessor-Based Temperature Compensation

The KAL-D series achieves superior compensation for changes
in liquid temperature during the measuring cycle by use of a
microcontroller. This method of temperature compensation
allows for very precise correction of flow measurement when
liquid temperature changes occur.

Specifications

Media: Water-Based Liquids (Water

Content at least 90%);
not Suitable for Oils or Fuels

Switching Range: 0.15...6.6 ft/sec.
Repeatability: ±2%
Response Time: 5.6...12 seconds typical
Switch Point
Adjustment: Via potentiometer
Flashing LED indicates
setpoint on 8 LED
bargraph indicator
Status Indicator: 1 dual color LED
Maximum Pressure: 580 PSIG
Operating
Temperature Range: -4...176 °F
Max. Clean-in-Place
Temperature: 250 °F
Wetted Parts: 316L SS
Housing Material: 304 SS
Power Requirements: 24 VDC ± 10% at 150 mA
Max.
Switch Type: NPN or PNP open collector,
normally open or normally
closed based on ordering
code
Switch Rating: 400 mA Max. at 24 VDC,
short circuit protected
Electrical Connection: Micro DC plug, 4-pin male
Electrical Protection: NEMA 4/IP65

Measuring/Switch Ranges

Pipe

Diameter

Approximate

Switching

Range
(GPM)

Pipe

Diameter

Approximate

Switching

Range
(GPM)

1/4" 0.02...1.0 1 1/2" 0.75...35

1/2" 0.1...4.0 2" 1.3...60

3/4" 0.2...9.0 3" 3...140

1" 0.3...15 4" 5.2...250

1 1/4" 0.5...25 6" 12...575

Important:

The flow ranges specified in the table above have been calculated
for each pipe diameter based upon the design velocity range of
the KAL-D. It must be noted that flow in pipes is non-uniform
across the pipe cross section and approaches zero at the pipe
wall. This means that, in practice, the installation depth of the
probe, the internal pipe diameter, and the flow profile of the liquid
in the pipe, can interact to produce VERY significant deviations
from the flow ranges in the above table.

Order Details (Example: KAL-D5408 N ST3)

Fitting

Type

1/4" NPT KAL-D5408

1/2" NPT KAL-D5415

M12x1 KAL-D0412

1/4" BSP KAL-D1408

1/2" BSP KAL-D1415

Model

Number

Type of Switch Connector

..N.. = NPN, N/O

..P.. = PNP, N/O

..M.. = NPN, N/C

..R.. = PNP, N/C

..ST3 =

Micro-DC
plug, 4-Pin,
male

Accessory:

807.037 = Mating 4-pin Micro-DC plug with 6 foot cable

2

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No responsibility taken for errors;

subject to change without prior notice.