Kobold KAL-L Operating Manual

KOBOLD KAL-L (KAL-8000 Series)

Thermal Air Flow Switch

User Instructions

KOBOLD Instruments Inc. 1801 Parkway View Drive Pittsburgh PA 15205

Phone [phone] • Fax [phone]

Manual-KAL-L_5-12

KAL-L

Table Of Contents

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

FM Rev. 5/17/12

KAL-L

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

Housing: Polyamide

Electrical Data

Power Requirements: 24 VDC/VAC +10%/-15%
Switch Characteristics: 1-SPDT relay Max. 250 VAC/4 A/1000

VA

Electrical Connection

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

Protection: NEMA 4/IP 65

FM Rev. 5/17/12

KAL-L 2

Diagram 2.1 Dimensions

7.0

4.0

φ15.5mm

Hex 41mm

4.3

HVAC Duct Mount

Flange

PG 13.5

Cable Gland

1/2” NPT

Compression Fitting

FM Rev. 5/17/12

All dimensions in inches

Unless otherwise noted