Features
- Optimal Temperature Compensation
- Simultaneous Monitoring of
Temperature and Flow
- Remote Probe Allows Installation
with Minimal Clearance
- Independent of Liquid Density
- Can be Used with Extremely Low
Velocities
- No Moving Parts
- Extremely Low Pressure Loss
- Easy to Operate
- Insensitive to Dirt
The KAL electronic flow switch continu-
ously monitors the flow of liquid media. It
can be used wherever flows must be
monitored with a minimal loss of pres-
sure. The KAL’s one-piece, stainless steel
sensor has no moving parts making the
KAL very reliable. High strength is another
advantage inherent in this design allowing
use at high pressures, and virtually
eliminating any chance of mechanical
damage.
Operation
The KAL design is based on the time-
proven calorimetric principle. The sensor
is internally heated to a few degrees
above the temperature of the medium.
Flow of the medium causes removal of
heat from the sensor, resulting in a cooling
effect. The degree of cooling is a measure
of the flow velocity.
The KAL electronic modules allow the
user to interface with the sensor to
provide access to flow or temperature
control in his process. The system can act
as either a flow switch only, or a
combined flow and temperature switch.
Switching is achieved by means of
internal SPDT relays.
The microprocessor based design of the
KAL distinguishes it from the competition.
Full temperature compensation of the
switch point is readily obtained through a
simple, one-time, calibration procedure.
This assures elimination of set-point drift
caused by temperature variations in the
process liquid.
Temperature Compensation
The KOBOLD KAL flow switch uses a
microprocessor to compensate for
temperature changes through use of an
internal look-up table. End-users can
easily adapt the equipment to the
requirements of their unique
installations. Compared to conventional
calorimetric flow switches, the technically
advanced design of the KAL provides a
switch point which changes negligibly
with temperature.
Selecting a System
The electronic flow switch consists of:
- the controller
- the sensor
The connecting cable between the two
parts may be up to 330 feet long. (with
KAL-E300 series units, temperature
correction is required with cable lengths
above 33 feet.)
Controllers
Three units are available. Each is com-
patible with the full series of sensors.
Electronic circuitry is located in a
standard DIN housing (NEMA 1) for quick
installation on terminal rails.
KAL-E100 Series
The KAL-E100 is equipped with a flow
rate sensitive, isolated SPDT relay. The
relay status is indicated by means of a
green LED.
KAL-E200 Series
Same as the KAL-E100, but with a trend
indicator for flow rate and switch point.
KAL-E300 Series
Same as KAL-E200 but with a
temperature switch. In addition to
monitoring the flow, this model can be
used to monitor the temperature. The
specified alarm temperature can be from
0–176 °F.
SPDT relays are activated if the flow
drops below the specified flow velocity,
or if the temperature drops below the
specified temperature.
Sensors
All of the sensor models can be used with
any of the three controllers.
Selection is a function of:
- connector threads
- max. operating pressure 1450 PSIG
- max. medium temperature 176°F
(250 ̊F Optional)
- sensor wetted parts
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