Kobold KAL-8115FL Manual de usuario

KOBOLD Instruments Inc. 1801 Parkway View Drive Pittsburgh PA 15205

Phone (412) 788-2830 • Fax (412)-788-4890

KOBOLD KAL-L (KAL-8000 Series)

Thermal Air Flow Switch

User Instructions

Manual-KAL-L_5-12

Table Of Contents

FM Rev. 5/17/12

KAL-L

1.0 General .......................................................................................................1

2.0 Specifications..............................................................................................1

3.0 Mechanical Installation................................................................................3

3.1 Installation General ..........................................................................3

3.2 Installation of Units with NPT Thread Connection............................5

3.3 Installation of Units with HVAC Flange Connection..........................5

4.0 Electrical Connections ................................................................................5

5.0 Operation ....................................................................................................6

5.1 Flow Setpoint Adjustment ................................................................6

5.2 Adjustment of the Start-up Time Delay ............................................8

6.0 Maintenance ...............................................................................................9

7.0 Need Help with Your KAL-L Flow Switch? ..................................................9

List of Diagrams

Diagram 2.1: Dimensions............................................................................2

Diagram 3.1: General Installation ...............................................................4

Diagram 3.2: Required Straight Pipe Runs.................................................4

Diagram 4.1: Electrical Connections...........................................................5

Diagram 5.1: Interior Controls Layout for the KAL-L...................................6

List of Tables

Table 2.1: Model Number Codes ...........................................................3

KAL-L

FM Rev. 5/17/12

CAUTION: For safety reasons, please read the cautionary information located at

the end of the manual, before attempting installation.

1.0 General

The KAL-L (KAL-8000 Series) Thermal Air Flow Switch uses the proven calorimetric

principle to monitor the flow of air or non-hazardous gases. A sensing resistive thermal

device (RTD) is heated to a few degrees above the temperature of the flow medium. As

the medium flows across the sensing RTD it cools the RTD. The rate of cooling is

proportional to flowrate. A second RTD measures medium temperature and the KAL-L

electronics uses this measurement to compensate for changes in medium temperatures

thus preventing false readings due to medium temperature transients. If the measured

flow value drops below the setpoint value, an output relay is activated providing an alarm

or control input.

2.0 Specifications

Switching Range: 3.3 to 66 feet/second @ 68°F/14.5 PSIA

Restricted span for other pressure and

temperature conditions

Accuracy: ±10% of flow rate

Repeatability: ±1% of flow rate

Display

Flowrate: 8 LED trend indicator

Switchpoint: Flashing LED in trend indicator

Switch Status: Dual colored LED

RED = Flow below switchpoint

GREEN = Flow above switchpoint

Max. Temperature Gradient: 30°K(°C)/Min. @ 25 feet/sec and 190°F

Response Time: Adjustable 1 to 60 seconds

Warm-up Time: 30 seconds

Max. Pressure: 120 PSIG

Temperature Range

Process: -10 to +250°F

Ambient: +15 to +140°F

Wetted Parts: Ni-Plated brass

Electrical Data

Power Requirements: 24 VDC/VAC +10%/-15%

Switch Characteristics: 1-SPDT relay Max. 250 VAC/4 A/1000

Electrical Connection

Standard: Cable gland

Optional: 1/2” NPT Conduit or M-12 plug

Protection: NEMA 4/IP 65

Housing: Polyamide

KAL-L 2

FM Rev. 5/17/12

7.0

4.0

φ15.5mm

4.3

PG 13.5

Hex 41mm

Diagram 2.1 Dimensions

All dimensions in inches

Unless otherwise noted

HVAC Duct Mount

Flange

1/2” NPT

Compression Fitting

Cable Gland

3 KAL-L

FM Rev. 5/17/12

Table 2.1 Model Number Codes

3.0 Mechanical Installation

CAUTION

Prior to mechanical installation, ensure that the process flow velocity to be monitored is

within the switching range of the device. Also ensure that system temperature and

pressure are within the limit of the device. See Section 2.0 ”Specifications”.

3.1 Installation General

The following general installation instructions and precautions apply to all KAL-8000

series installations:

3.1.1 The probe tip must be inserted a minimum of 3/8” beyond the

inside diameter of the pipe or duct into which it is to be installed.

Best results are obtained if the probe is inserted into the pipe or duct 1/

2” or greater.

3.1.2 In order to ensure that the sensing elements are facing directly into the

flow stream, a notch has been placed on the probe hex nut to aid in

alignment. For optimal results, the probe should be installed so that the

notch is aligned directly over the centerline of the pipe or duct.

3.1.3 In order to ensure a uniform flow profile across the probe tip, install the

probe to allow for 10 pipe diameters of straight run piping upstream and

5 downstream. This piping should be free of tees, elbows, bends,

valves, dampers or any other such appurtenances.

3.1.4 The probe should not be installed in the lower hemisphere of the pipe or

duct. Liquid and debris which collect in the lower portion of the pipe will

cause the probe to function erratically if they come in contact with the

probe.

Model Code Description

KAL-8115 15mm smooth bore probe with 1/2” NPT compression fitting

KAL-8115FL 15mm diameter probe with clamping flange per DIN 43 743

Options

Option Suffix Description

-M12 NEMA 4 electrical plug connector

-C 1/2” NPT conduit connection

KAL-L 4

FM Rev. 5/17/12

Diagram 3.1 General Installation

Diagram 3.2 Required Straight Pipe Runs

3.2 Installation of Units with NPT Thread Connection

Mount the unit

in the pipe upper

hemisphere

Liquid and sediment

which settle at the bottom

cannot cause measuring

errors

Mount probe such that

the notch cut into the

hex is perpendicular to

the pipe centerline to

ensure that the probe is

properly oriented in the

flow stream.

3/8” Min. probe

insertion depth.

1/2” or greater is

optimal

Flow

10XD Upstream 5XD Downstream

5 KAL-L

FM Rev. 5/17/12

3.2.1 Units with NPT threaded connections are best suited for round pipes or

ducts in which systems are under pressure. The NPT connection

makes a leaktight seal to 120 PSIG.

3.2.2 The threaded connection should be installed into a pipe via a 1/2” weld

coupling or a pipe tee with 1/2” connection. If a bushing is used to

reduce a larger fitting size to 1/2”, ensure that the probe insertion

requirements are met. See Section 3.1 ”Installation General”.

threads.

3.3 Installation of Units with HVAC Flange Connection

3.3.1 Units with flanged connections are best suited for square ducts in HVAC

applications where adding an NPT connection is impractical.

3.3.2 Prior to installing the flange, the flange face which contacts the surface

of the HVAC duct should be sealed using a field manufactured gasket

or RTV compound. This will minimize leakage at the flange face.

4.0 Electrical Connections

4.0.1 All electrical connections are made at the terminal blocks inside the

electronics enclosure of the KAL-L.

4.0.2 The KAL-L can operate using a power supply of 24 VAC or DC. When

DC voltage is used, the input supply is non-polarized. The polarity

of the DC input voltage does not matter and can be wired in either

direction without affecting the operation of the unit.

Diagram 4.1 Electrical Connections

Relay Output

SPDT

Max. 4A @ 250 VAC

3.2.3 Ensure that a thread sealant such as PTFE tape is used to seal the

KAL-L 6

FM Rev. 5/17/12

5.0 Operation

Diagram 5.1 Interior Controls Layout for the KAL-L

5.1 Flow Setpoint Adjustment

The section describes the procedures for adjustment of the flow setpoint for three

scenarios:

• Adjustment of precise setpoint on falling flow.

• Adjustment of precise setpoint on rising flow.

• Setup for flow/no flow detection.

5.1.1 Flow Setpoint Adjustment - General

The flow switch point on the KAL-L is fixed at 50% of its span. Because of the trend

indicator’s non-linear response, this corresponds to the third LED on the indicator bar.

The third LED is wired to flash permanently to allow users to judge the location of the

flow setpoint relative to system flow.

The flow switch point is set by adjusting the span potentiometer P1. Doing this increases

or decreases the span of the trend indicator thereby changing the point at which the

KAL-L switches. The next three sections describe how to set the KAL-L switchpoint in

specific situations

24V AC/DC

RELAY

Trend Indicator

8 LEDs

DUO-LED

Green= Flow > Setpoint

Relay Activated

Red = Flow < Setpoint

Relay Deactivated

Start-up Time Delay P2

Holds the relay in activated

state for 0 to 60 seconds after

power-up

Span Adjustment P1

Setpoint LED

Fixed at 3rd LED

(flashing)

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